Can my timing be off, Could use help finding this problem Please. We’re setting our own standards and proving that Professional Grade isn’t merely a label, it’s a way of life. If you have a 2002 or 2003, you MAY NOT see an increase in the idle speed to 850 RPM at this time. 5 GMC Sierra 2500 lly CrewCab 4X4 At idle in gear the rpm would fluctuate 100 +/-. When i switch ON the airconditioner, the RPM reduces to 1. It does this while it is in park or in drive while stopped at a light. PTO and Fast Idle Capable Powertrain Control Systems (continued) Vehicle Nameplate Engine RPO Fuel - Gas or Diesel Engine Label 99 X X X X X X X X 00 X X X X X X X X 01 X X X X X X 02 X X X X X X 03 X X X X X X X 04 X X X X X X X GMC Savana GMC Savana GMC Savana GMC Savana GMC Sierra GMC Sierra GMC Sierra GMC Sierra GMC Sierra GMC Suburban GMC. The RPM fluctuates 500 to 400 and back then settles,then it starts again. Shop millions of cars from over 21,000 dealers and find the perfect car. Speedometer Range: 140 MPH. Below is a list of complaints & problems filed against the 2018 GMC SIERRA 1500. 2001 GMC Sierra EVAP Secondary Air System Not Ready The OBDII monitor is not ready. Get up todate free price quotes from dealers near you. 5 engine - rpm surges when idle is at 1000 rpm will not do it if idle is 650 and don't know why high idle either. 0L Now Supported. We offer high quality new, OEM, aftermarket and remanufactured GMC G1500 Idle Control Valve parts. What are the common causes of code P0507 ? Depending on year, make, and model, DTC P0507 may have number of causes. the trucks idle speed as of this morning was 700-800rpm. Cap & Rotor & Fuel Filter. i have gmc acadia 2010 , 79000 km , showing up very low fuel mileage since 5 month , change engine oil, air filter , spark plug, cleaned mass airflow sensor, but still on obd2 scan shows -22 LTFT on idle and -17 at 2500 rpm , in my region mechanic even not bothered to address the issue they. This is a truck with the luxury of a Cadillac. While idling I am getting some itermittent (it only happens every once and a while) fluctuations in RPMs. In this topic, Solving Idle Problems, is a recap of the entire series of topics for What to Do When you have engine idle issues. The ECM concludes that the idle speed control ECM function is malfunctioning if: 1) the actual idle RPM varies more than the specified amount five times or more during a drive cycle, or 2) a learning value of the idle speed control remains at the maximum or minimum five times or more during a drive cycle. It's not dependent on RPM. AIC is located @ the throttle body. New Idle Air Control Valve For Chevrolet Pontiac GMC Sierra 5. 0 stalls out at low idle. The most recently reported issues are listed below. It's really a pain when the truck is in gear (automatic). The needle seems to never stay steady even when cruising at a constant speed, but its most noticeable with a cold start. Start the engine. 1A Auto has many aftermarket IAC Valves for your GMC Sierra 1500 and ground shipping is always free!. Engine rpms may fluctuate a couple hundred or so, but I'm going off sound. The LB7 was available for 2001 to 2004 model year GMC and Chevrolet HD pickups. The 2017 GMC Sierra HD really only gets one fresh feature, but it’s a biggie. 3 V6 "W" 1980 GMC C1500 Transmission Reinstallation Help; 2000 Gmc sierra seats; leveling the front; 2000 sierra clock/shifter panel flashing/clicking on startup; 1997 Sierra bucks when accellerating; 2008 GMC synthetic oil; 99 Sierra low rpms; changing a head. Q: RPM's fluctuate while idle RPM's fluctuate while idle. Many people have removed and cleaned them but, this is normally a temporary fix and the valve should be replaced. Hello, i have an 09 sierra, 5. 5 engine - rpm surges when idle is at 1000 rpm will not do it if idle is 650 and don't know why high idle either. Its a 4 wire valve bolted on to the throttle body. At acceleration pressure returns to 40-50. I have replaced thermostat, radiator cap, checked hoses, and still it is showing overheating more Complaints. 2015 - 2016 Chevrolet Corvette, Silverado built prior to 11/01/15. Full manual control of the elevated idle on your Duramax truck is possible with our High Idle Kit. WHen it throttles up, if you turn it off and restart it, it idles back about 600 rpm as normal. 0 stalls out at low idle. Truck also has a problem with sticky throttle body which has been dangerous. 2002 GMC sierra. I have tried resetting t. If the vehicle is a hybrid, see the hybrid supplement for more information. Further information from the customer indicated that the truck misfired the worse in drive, not overdrive, at light to normal cruise around 2000 rpm to 2500 rpm. Ask Question (Stationwagon) with fluctuating idle RPM. We sell wholesale to the public. It's not dependent on RPM. If I put it in neutral, and tap the throttle, it goes to 2500 rpm and stays. This is not that. AIC is located @ the throttle body. Condition/Concern A dealer may encounter a customer concern of an intermittent high idle. Subject: Information on Vibration Analysis and Diagnostic 2015 Chevrolet Silverado 1500 2014 GMC Sierra 1500 2015 GMC Sierra 1500 Condition/concern *For rough idle and/or vibration at idle. It does this while it is in park or in drive while stopped at a light. Full manual control of the elevated idle on your Duramax truck is possible with our High Idle Kit. 1-Steady gauge reading from 17-22 indicates normal engine in good condition. See TSB (Technical Service Bulletin) reports for the 2008 GMC Sierra. Tachometer Range: 6000 RPM. Also please check out the statistics and reliability analysis of GMC Sierra 1500 based on all problems reported for the Sierra 1500. I moved your thread since it was in the "site" support forum, meant for web site issues, not vehicles ones. I recently moved and am downsizing on all vehicles. 6-liter Duramax turbo diesel V8 has a massive claimed output of 445 horsepower and 910 lb-ft of. Service manager told me to cut my losses and but a new one. 0L gas engine on 2011 gmc sierra HD. Light up your gauges with the Stainless steel pink copper Rose Gold anodized gauge panel face. Further information from the customer indicated that the truck misfired the worse in drive, not overdrive, at light to normal cruise around 2000 rpm to 2500 rpm. 2014-2018 Chevrolet Silverado/GMC Sierra 1500 4. ‘87 GMC S15 SCLB 4. 1L, Gas, & 6. 1993 GMC Sierra 1500 SLE Sportside This is a one owner 1993 HMC Sierra SWB Sportside truck thru May 2016 resided in the Phoenix areaSandy Valley AZ with 127,832 original miles with the transmission rebuilt 8/10/2010 at 105,885 miles by Super DiscountTransmissions, Phoenix, A, engine work described as "major engine overhaul" same month by Greenway Auto Repair, Phoenix, AZ; and a Leer Sportsman. I am talking like 200-300 RPM's per second, not every 10 or so. The idle speed will return to normal if any of the following conditions occur: There is brake, clutch, or throttle input from the driver. Connect vacuum gauge to base of carburetor to full vacuum source at idle. Full manual control of the elevated idle on your Duramax truck is possible with our High Idle Kit. I replaced my 2000 GMC Sierra 1500 (V8) TPS sensor because of rough idle, did not solve the problem, so I replaced the Idle Air Control Valve, and that didn't fix it either. 2015 - 2016 GMC Sierra, Yukon, Yukon XLbuilt prior to 11/01/15. If the vehicle is a hybrid, see the hybrid supplement for more information. The truck runs great. I will stall when stopped if I do not push the gas pedal. 2) have been met, you can set Variable Fast Idle by Depressing and Holding the accelerator at the desired RPM, then Pressing and Releasing the Cruise "SET" switch to establish the desired Fast Idle speed. Buy AIP Electronics Idle Air Control Valve IAC Compatible Replacement For 1999-2004 Cadillac Chevrolet GMC and Pontiac 4. No problem starting right back up though. It's struggling to idle under normal circumstances then you go and load up the engine when RPM should be higher anyway and it's struggling even further. This is a normal condition. Buy AIP Electronics Idle Air Control Valve IAC Compatible Replacement For 1999-2004 Cadillac Chevrolet GMC and Pontiac 4. Search our online idle control valve catalog and find the lowest priced discount auto parts on the web. I've recently noticed while driving around 70mph on flat highway surfaces my RPMs will constantly fluctuate between 2k-3k RPMs. / Canada-9761994) - 2016 - CRC - 2/22/16 Instruments and Controls 11 Engine Power - Engine is active with energy flowing to the wheels. In cold weather my 2000 sierra starts, reves up idles back down to rough idle and continues to do so for about a minute. It'll shoot up to 3 and I can fell it kick in and within a second or two will drop back down to 2. RPM fluctuation while idling. It does this consistently and gets pretty annoying. Fully extend (low) IAC with tester. 386,000 17 to 21 MPG and 1 qt oil about 4K miles no smoke. The Silverado name was taken from a trim level previously used on its predecessor, the Chevrolet C/K. Average failure mileage is 112,700 miles. 0L V8 US 1A Idle Air Speed Control Valve IAC ISC for Chevy GMC Cadillac V8 Pickup Truck. Also please check out the statistics and reliability analysis of GMC Sierra 1500 based on all problems reported for the Sierra 1500. The condition is intermittent, but can be relatively easy to duplicate at idle, with the engine at operating temperature, in gear, and with the A/C on, although the A/C does not need to be on. GMC Sierra P0506 Causes and Diagnosis There are a lot of potential causes to P0506. 1993 GMC Sierra 1500 SLE Sportside Description This is a one owner 1993 HMC Sierra SWB Sportside truck thru May 2016 resided in the Phoenix areaSandy Valley AZ with 127,832 original miles with the transmission rebuilt 8/10/2010 at 105,885 miles by Super DiscountTransmissions, Phoenix, A, engine work described as "major engine overhaul" same month by Greenway Auto Repair, Phoenix, AZ; and a. The third of four long-term reports on the 2018 GMC Sierra 2500HD Denali. P0507 GMC Idle Air Control System RPM Higher Than Expected GMC Acadia,GMC Canyon,GMC Envoy,GMC Savana 1500,GMC Savana 2500,GMC Savana 3500,GMC Sierra 1500,GMC. 2-A intermittent fluctuation at idle indicates a ignition miss or sticking valves. But hardly anyone references the butterfly on the TBI unit not being adjusted right. He is an HPTuners member on this site. Additionally, find 1995 GMC Sierra 1500 warranty and reliability information, such as limits on bumper-to-bumper coverage and major components. If you're looking for an easy way to up the throttle power in your 2014-2015 Chevrolet Silverado or GMC Sierra, try adding this Airaid Poweraid Throttle Body Spacer 200-543 from CJ Pony Parts!. View our Watrous Mainline Motor Products ltd inventory to find the right vehicle to fit your style and budget!. This is a normal condition. What would make my voltage gauge read low when battery is good output when the engine is at an idle of 600-700 RPM. 6L V8 Duramax diesel: 2004 late, 2005 GMC GM Chevy Chevrolet 6. An idle stop screw is set at the factory and then covered to discourage tampering. There are 34 complaints filed for the 2018 GMC SIERRA 1500. It does not stall but sounds like it wants to. It seems if the butterfly is closed and not open enough to begin with, the ecm will never find the correct idle. Also if i push her too much to go faster too quickly it starts acting like the transmission is slipping. It's really a pain when the truck is in gear (automatic). Transmission. Also only when hot operating range. eventually the message " Turn Engine off Oil Pressure Low. 6L Duramax LB7 specifications, history, & information. 0L LQ4 V8 gas engine can rest assured knowing that Spectre Performance warrants all its products to be free from workmanship and material defects with a limited 90 day warranty. The original engine family was phased out in early 2014, with its final use as the 4. My rpms are going high and my mph take a minute to go higher on my GMC Yukon. For vehicles first sold in Canada, substitute the name "General Motors of Canada Limited" for GMC and Chevrolet Motor Division. I took it for a little trip at 55mph for about 10 miles ( I was told to do so to let the tps relearn) and as long as i let it idle down while in gear, its fine. If I rev the engine and let the rpms come back down once it comes back to about 700 rpms down to 500 or so it feels like it is surging and stumbling and then settles back down. 2000 GMC Sierra 5. But the stable idle won't last long, it'll idle low and rough. listen to the engine and see if its actually changing rpm,s if not you may have a faulty tachometer in it,those do go bad and will cause it to go up and down like that but if the engine its self is changing rpm,s a lot you may have a 0-2 sensor going bad on it,that will cause it to not have a steady rpm at idle,also an idle air control valve. 360 hp @ 5400 rpm. The oil pump spins up as engine RPM's increase and thus raises the oil pressure in the system which if you think about it makes sense. 2L/376CI V8 2009 - 2018. It is normal for a GMC Sierra to idle fast when it is first started. If engine rpm is higher than expected, by 200 rpm or more, the ECU will set DTC P0507 – Idle Control System RPM Higher than Expected in memory. Learn about this problem, why it occurs, and how to fix it. Oh and the truck has new transmission fluid and a new filter, but that was about 700 miles ago. Find GMC Standard Motor Idle Air Control (IAC) Valves and get Free Shipping on Orders Over $99 at Summit Racing! Standard Motor Products replacement idle air control valves help you get maximum fuel efficiency and powe. Today experienced a poping sound almost like a backfire from underneath. Hello everyone. Check out the deal on Sprint Booster V3 07-18 Chevrolet Silverado / GMC Sierra at Diesel Power Products low to mid RPM range where most vehicles spend their time. A visual inspection showed that new spark plugs, spark plug wires, ignition cap, and rotor have been installed. The ECM regulates the idle speed by opening and closing the throttle valve using the ETCS. Manufactures have removed these. Follow strategy-based diagnostics and check the Service Information for the latest bulletins and PIs. There are a lot of potential causes to P0507. Four circuits are used in order to control the IAC valve, allowing a precise amount of air into the intake manifold. I own an 07 Colorado 2. 0 w/ 80k miles will fluctuate idle up and down quickly between 500-1000 RPM at times, and at other times it idles smoothly. Manufactures have removed these. com FREE DELIVERY possible on eligible purchases. Average failure mileage is 7,350 miles. GMC Sierra has been in shop to many times to keep track of. GMC Sierra 1500 owners have reported 5 problems related to engine (under the engine and engine cooling category). It's controlled by the computer. You might have a bad IAC valve. '93 GMC Sierra 5. most noticeable crusing in overdrive. Rpm Fluctuate while driving. 7L 350 Vortec and I am having problems with it surging while it is in gear. 1A Auto has many aftermarket IAC Valves for your GMC Sierra 1500 and ground shipping is always free!. CEL flashes at around 3k RPM. i have noticed my rpm needle moves a bit up and down wheather i'm at idle or cruising down the hwy. The source of the information below is the National Highway Transportation Safety Administration (NHTSA), which maintains TSBs for vehicles sold in the United States. Below is a list of complaints & problems filed against the 2014 GMC SIERRA. Just replaced a throttle body on this GMC and now it will not return to idle properly - after i clear the system it will start and idle down -relearn is to run for 3 minutes and off for 1 min. Cleaned it and that helped it out But the idle RPM was really high and took a long time to go down, so I thought it was a problem with thermostat being fully open. The new in-line five idles at about 600 rpm, where it evinces a peculiar staccato backbeat that is felt more than heard. Anyway, my truck started making an odd whistling/whining sound that fluctuates with the RPMs. New GM rebuild engine install. 1993 GMC Sierra 1500 SLE Sportside Additional Info: This is a one owner 1993 HMC Sierra SWB Sportside truck thru May 2016 resided in the Phoenix areaSandy Valley AZ with 127,832 original miles with the transmission rebuilt 8/10/2010 at 105,885 miles by Super DiscountTransmissions, Phoenix, A, engine work described as "major engine overhaul" same month by Greenway Auto Repair, Phoenix, AZ; and. As soon as I start driving or increase my RPM's it goes right back to normal. 2-A intermittent fluctuation at idle indicates a ignition miss or sticking valves. It is starting to get very irritating. AIC,TPS, and MAF sensors. The LLY was available for 2004 to 2006 model year GMC and Chevrolet HD pickups. The 2017 GMC Sierra 1500 has 7 problems reported for engine runs rough. It runs fine under load, it's just at an idle. A visual inspection showed that new spark plugs, spark plug wires, ignition cap, and rotor have been installed. the pedal but having 900+ ft. This morning I noticed that while coasting in neutral from any speed between around 25-55 mph, the RPM will fluctuate between 750 and 500 causing it to become a little jerky while coming to a stop. 7L TBI, I've replaced the Timing Chain & Gears, IAC valve, TPS, MAP, EGR & Solenoid, ES Module & Knock Sensor, ECS, Ignition Module, Plugs & Wires, Dist. Owners of 2011, 2012, and 2013 Chevrolet Silverado and GMC Sierra 2500 / 3500 HD models with the 6. 6L Duramax 3/4 1 ton. It is normal for a GMC Sierra to idle fast when it is first started. I replaced my 2000 GMC Sierra 1500 (V8) TPS sensor because of rough idle, did not solve the problem, so I replaced the Idle Air Control Valve, and that didn't fix it either. Not sure what's up at 60 MPH, but the low speed issue is 98% certain to be a dirty throttle body. High idles may be commanded by the ECM for certain battery charging electrical loads or diesel particulate filter (DPF) cleaning processes. Need to replace your GMC Sierra 1500 Idle Air Control (IAC) Valve? Then shop at 1A Auto for a Idle Air Control Valve replacement for your GMC Sierra 1500 at a great price. 2007 GMC Sierra Engine and Engine Cooling Technical Service Bulletins (TSBs). Learn more about the 2007 GMC Yukon. Connect vacuum gauge to base of carburetor to full vacuum source at idle. GMC Sierra 1500 6. The 2015 GMC Sierra 3500HD Denali comes in at a base price of $53,995 with our tester topping off at $64,005. the vehicle has cooper tires, size lt26575-16. My rpms are going high and my mph take a minute to go higher on my GMC Yukon. Then monitor your readings and compare readings to chart below. com; Register If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a. Although my opinion (supported by others too) is that the idle speed needs to be re-learned, the system should still be capable of maintaining an idle speed. GMC Sierra P0506 Causes and Diagnosis There are a lot of potential causes to P0506. I am talking like 200-300 RPM's per second, not every 10 or so. 2015 - 2016 GMC Sierra, Yukon, Yukon XL built prior to 11/01/15. Good afternoon, I have a '04 2500 HD duramax, with a idle problem. If you’re looking for information on a newer GMC Sierra 2500HD, we’ve published an updated review: 2018 GMC Sierra 2500HD Review Changes are few and far between in the world of big trucks, so when the 2017 GMC Sierra Denali 2500HD gets a full-blown overhaul of its Duramax diesel, it's a big deal indeed. Read more General Motors reviews to learn about other models. It is listed at 425 hp @ 5,600 rpm and 450. Includes key design features, engine specs, horsepower/torque ratings, & more. 5 engine - rpm surges when idle is at 1000 rpm will not do it if idle is 650 and don't know why high idle either. There is an IAC (Idle Air Control) solenoid that moves a plunger that controls the idle speed. If you have a 2002 or 2003, you MAY NOT see an increase in the idle speed to 850 RPM at this time. Start the engine. If its a mechanical problem with the spring or pintle in the valve, it will not set a code for the IAC. See 38 Consumer Reviews, 172 Photos and Full Expert Review of the 2018 GMC Sierra 1500. Service manager told me to cut my losses and but a new one. Almost stalls at idle and flux of up to 500 rpm on throttle. The GMC ECU chip will upgrade the torque to the extent that the liters of gas will be well utilized and the truck will travel for longer distances than it used to. Additionally, find 1995 GMC Sierra 1500 warranty and reliability information, such as limits on bumper-to-bumper coverage and major components. Is it also possible that the alternator output at warm idle is insufficient for the electical demand of the moment? I ask because I noticed years ago while driving a 1996 Toyota Celica (1. My problem is that once the engine is up to temperature the idle will fluctuate. Home › Forum › GMC › 2015 Yukon Denali rough idle issue and general frustration This topic contains 2 replies, has 3 voices, and was last updated by GM-4-LIFE 4 years, 5 months ago. 6L V-8 Turbo Diesel engine or the 4G LTE Wi-Fi hotspot. But behind the wheel of the 2017 GMC Sierra 3500 Denali dually I 90 percent of its peak torque by 1,500 rpm. 190k miles with a 6. 9) The idle speed will increase to the STANDBY speed of ~850 RPM for 2001 Duramax diesel equipped trucks. Truck also has a problem with sticky throttle body which has been dangerous. The 2014 GMC Sierra 5. the pedal but having 900+ ft. 2000 GMC Truck GMC K Sierra - 4WD. 1L, Gas, & 6. Looking for a 2000 GMC Sierra 1500 Idle Control Valve? Get yours at Wholesale Prices and Free Shipping over $50 only here at AutoPartsWarehouse!. Condition/Concern A dealer may encounter a customer concern of an intermittent high idle. We sell wholesale to the public. Further information from the customer indicated that the truck misfired the worse in drive, not overdrive, at light to normal cruise around 2000 rpm to 2500 rpm. While the code specifically mentions the "Idle Air Control System", it would be a mistake to just go ahead and replace it without a little due diligence. Have had seve. Check out the deal on Sprint Booster V3 07-18 Chevrolet Silverado / GMC Sierra at Diesel Power Products low to mid RPM range where most vehicles spend their time. Service manager told me to cut my losses and but a new one. because the “base radio may not work, preventing audible warnings if the key is in the ignition when the driver’s door is opened. The table below shows all 1995 GMC Sierra 1500 specs by style, including MPG (fuel economy), transmission details, and interior and exterior dimensions. AIC is located @ the throttle body. Check out the deal on Sprint Booster V3 07-18 Chevrolet Silverado / GMC Sierra at Diesel Power Products low to mid RPM range where most vehicles spend their time. Engine low power will not go over 2300 rpms. com FREE DELIVERY possible on eligible purchases. 6-liter Duramax turbo diesel V8 has a massive claimed output of 445 horsepower and 910 lb-ft of. To see how frequently GMC Sierra 1500 problems occur, check out our car reliability stats. Re: erratic RPM when stopping My best assumption as to why it seems worse with the A/C running is because of the increased load demand. However, if throttle body is replaced AND a proper idle speed cannot be obtained, there is an adjustment which may be made. Buy AIP Electronics Idle Air Control Valve IAC Compatible Replacement For 1999-2004 Cadillac Chevrolet GMC and Pontiac 4. Lately I have been. Good afternoon, I have a '04 2500 HD duramax, with a idle problem. See 38 Consumer Reviews, 172 Photos and Full Expert Review of the 2018 GMC Sierra 1500. The truck has 250 000 km on it, it is a 2000 Sierra 4x4 with Z71 package (aluminum block) and lately it has intermittenly been idling high, when in gear with the brake on high idle is approx 750 rpm, and when i shift into park it jumps to approx 1350 rpm, the normal idle for this truck in gear is 500 rpm, and in park 750 rpm, if anyone has any ideas please let me know, thanks. ignition timing and idle speed for 1974 BBC 454; 2-A intermittent fluctuation at idle indicates a ignition miss or sticking valves. The LGH engine is rated at 335 bhp (250 kW) at 3100 rpm and 685 lb⋅ft (929 N⋅m) at 1600 rpm. If I put it in neutral, and tap the throttle, it goes to 2500 rpm and stays. A faulty O 2 sensor can also cause RPM to fluctuate at idle. P0507 GMC Idle Air Control System RPM Higher Than Expected GMC Acadia,GMC Canyon,GMC Envoy,GMC Savana 1500,GMC Savana 2500,GMC Savana 3500,GMC Sierra 1500,GMC. Well once the engine drops below 600 or so RPMs the Alternator is not spinning fast enough to keep up with demand. How many miles, and have you ever cleaned it before? THese engines don't have a traditional PCV valve, and the back side of the throttle body can get as dirty as Abe Lincoln's. 2014-2015 Chevy/GMC Truck & SUV Coverage. I have recently replaced the distibutor, fuel pump, fuel filter, and all of the spark plug wires (one at a time to make sure not to mix them up). I've recently noticed while driving around 70mph on flat highway surfaces my RPMs will constantly fluctuate between 2k-3k RPMs. If the voltage gauge is fluctuating, but that's the only symptom, besides checking the battery connections, I wouldn't do anything. It is starting to get very irritating. - the second time i start it it will go to 1200 rpm a. I have achevy 2500hd that use to idle at about450 -500 rpm and would stall sometimes now after I tuned it up plugs and wires it. If you want to haul or tow stuff or go on a long trip it is good for all. Comp Cams Xtreme Camshafts for your 2014-2015 Chevrolet / GMC Truck at RPM Outlet. Rough idle in cold weather 14 Answers. Idle Air Control Motor for all 2001, 2002, 2003 and 2004 GT Mustangs Built After September 6, 2001. Sometimes it has a really rough idle. This morning I noticed that while coasting in neutral from any speed between around 25-55 mph, the RPM will fluctuate between 750 and 500 causing it to become a little jerky while coming to a stop. GMC Sierra 1500 / 2500 / 3500 Info >> My truck is showing it is overheating. Light on dash says Check Gauges. Surge is about 500 RPM and then back down. This is 1200 RPM for Light duty, and 1500 RPM for medium duty trucks. 0L V8 US 1A Idle Air Speed Control Valve IAC ISC for Chevy GMC Cadillac V8 Pickup Truck. If you want to haul or tow stuff or go on a long trip it is good for all. In order to increase the idle RPM, the control module will command the valve pintle to move away from its seat, allowing more air to bypass the throttle plate. The engine would idle perfectly, but as soon as you put your foot on the gas pedal, the revs would drop from 800 to about 500 rpm, then slowly build back up then from 1000 rpm everything would be fine. I have recently replaced the distibutor, fuel pump, fuel filter, and all of the spark plug wires (one at a time to make sure not to mix them up). It is normal for a GMC Sierra to idle fast when it is first started. '87 GMC S15 SCLB 4. 9) The idle speed will increase to the STANDBY speed of ~850 RPM for 2001 Duramax diesel equipped trucks. 386,000 17 to 21 MPG and 1 qt oil about 4K miles no smoke. Have had seve. Recently the car has been experiencing the fluctuating rpms when releasing the gas pedal more often. *eh updated 6/11/10. Technicians said it was a new vehicle and. 2002 was the last year they used a EGR valve from what I understand. To see how frequently GMC Sierra 1500 problems occur, check out our car reliability stats. Oil registers full info center says 74%. Don't know if that helps. The problem I had was with my 1990 NA, which had mysteriously developed a deep hesitation whenever the car moved off from rest. Crack the throttle a titch, up to 900 or so rpm, and the idle suddenly goes. When I'm accelerating and get to required speed my RPM gauge either drops and steadies or jumps up then steadies back. Add up to 18 HP & 27 lb-ft TQ for:. All you have to do is plug into the OBD-II port on your truck (located under the dash) and you can add horsepower and torque without even popping the hood!. I've recently noticed while driving around 70mph on flat highway surfaces my RPMs will constantly fluctuate between 2k-3k RPMs. The 2002 GMC Sierra 2500 has 1 problems reported for fluctuating idle. It is starting to get very irritating. Cap & Rotor & Fuel Filter. It is listed at 425 hp @ 5,600 rpm and 450. 6L Duramax LBZ specifications, history, & information. How do we adjust an engine's idle speed? In the past, adjusting an engine's idle speed was easy. New Idle Air Control Valve For Chevrolet Pontiac GMC Sierra 5. MY 1991 gmc sierra 1500 idels speraticly at 1500 rpms but then some times the service engine light will come on and the truck will idle so low that it will practicly. The truck runs great. See TSB (Technical Service Bulletin) reports for the 2008 GMC Sierra. It seems if the butterfly is closed and not open enough to begin with, the ecm will never find the correct idle. GMC Sierra P0507 Causes and Diagnosis. Edmunds has detailed price information for the Used 2007 GMC Sierra 1500 Regular Cab. While normal is about 600 rpm, during regen the idle will bump up to between 800 and 900 rpm. In the case of GM vehicles (and possibly others) if the idle speed is over 200 rpm higher than expected, this code will be set. The vehicle may exhibit a condition that can be described as an erratic idle, idle surge, rough run, or near stall. The idle speed will increase to ~1250 RPM for 2001 - 2003 Duramax equipped trucks. My car starts fine, but when I start driving it randomly fluctuates between 500 RPMs and 1500 RPMs. Oh and the truck has new transmission fluid and a new filter, but that was about 700 miles ago. 2001 GMC Sierra EVAP Secondary Air System Not Ready The OBDII monitor is not ready. I will stall when stopped if I do not push the gas pedal. 7 ive replaced everything also at 1500 rpms it sounds like it has a bad [non-permissible content removed] cam in it anything lower or higher than that runs fine except it wants to stall at idle but if i unplug the alternator plug it still has a surge but not as bad plus i just replaced the alternator 2. At idle, tach still fluctuates wildly, engine rpms drop and it runs rough, like its threatening to die, but it hasn't yet. My rpm is fluctuating at the same throttle position. FUNCTIONAL DESCRIPTION 3. More GMC Sierra. Chevrolet/GMC Silverado/Sierra eAssist Supplement (GMNA-Localizing-U. Re: erratic RPM when stopping My best assumption as to why it seems worse with the A/C running is because of the increased load demand. Engine and Battery Power - Both. There are a lot of potential causes to P0507. What would make my voltage gauge read low when battery is good output when the engine is at an idle of 600-700 RPM. Buy AIP Electronics Idle Air Control Valve IAC Compatible Replacement For 1999-2004 Cadillac Chevrolet GMC and Pontiac 4. Had that fixed by mechanic, but still problem exists. No codes everythin checked. Hi everyone. I bought two 2016 Chevy 3500 Diesels off the lot in November (well two different dealerships, long story). The 2015 GMC Sierra 3500HD Denali comes in at a base price of $53,995 with our tester topping off at $64,005. The torque converter unlocks momentarily, causing RPM's to rise, sending more power to the rear wheels. Hello, i have an 09 sierra, 5. 2002 GMC Sierra SLT LB Z71-Red. However, if throttle body is replaced AND a proper idle speed cannot be obtained, there is an adjustment which may be made. GMC gave extended warranty in 2000 bacause of problems also issued customer appreciation certificate if I wanted to buy new gm product.