Question about GMC Sierra

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Engine shaking at idle

Hi I have a 08 sierra 165k was great till i pulled my camping trailer 18ft now i have a idle shake otherwise still good could it be the TPS ? Thanks Ron.

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A shake usually means a cylinder miss.
Is the check engine light on ?

Posted on Jul 22, 2013

Testimonial: "no nothing telling me there's a problem and if it had cylinder miss it would have loss of power and it's not all the time."

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5 Answers

Why does it shake whenever i let off the gas and shakes real bad when i apply my brakes


If when applying the brakes the steering wheel shakes then your front rotors are warped and at the least need resurfaced and most likely the brake pads replaced. But more likely the rotors are too thin which has allowed them to overheat and warp which causes the shaking. In this case new rotors and pads are in order. If when braking tou feel the shaking in the seat of your pants then most likely the rear brakes are the issue. Same problem as the front, warpage, but your rear brakes are most likely drums. Again, possible resurfacing and new shoes; but more likely new drums and brake shoes.

But I wonder? Did this vibrating just start all of a sudden or maybe after a near accident requiring you to brake very heavily and possibly overheat the brakes. Or my main concern, to keep this from happening again, after pulling some type of trailer that you intend on pulling again. Pulling a trailer without its own brakes puts a much heavier load on your trucks brakes and just repairing them won't keep it from happening again if you ARE pulling a trailer. Higher quality rotors/pads/drums/ and brake shoes can help but if the trailer is too heavy for the truck nothing but installing brakes on the trailer or a lighter trailer will stop you from warping them again.

Lastly, in general when you let off the gas and the whole vehicle shakes the driveshaft/u-joints are common causes. Same with the steering wheel if it shakes when letting off the gas, but only on a 4x4 or AWD vehicle. So check your driveshafts and u-joints and make sure they are tight. But unless you find something obvious there I would wait until you have the brakes sorted out and see if that doesn't stop all the shaking.

Good luck!

Jun 24, 2014 | 1995 GMC Jimmy

1 Answer

What would cause truck to shake very hard or rough when starting?


I really need to know the mileage.....?..also the question isn't very clear ...Is the whole truck shaking roughly or is the engine shaking roughly or is it both the engine and truck shaking..?..Since I am not sure I will answer what I can....Ok......If the truck is shaking while sitting still at idle the engine/trans mounts could be worn and or loose mounting hardware...If the engine is running roughly at idle causing all to shake that bad it could be a number of things causing it as usual...Quite often a faulty plug wire/and or bad plug will make it have a misfire because it will be running on only 5 cylinders..If that's the case it could be more than one bad...A vacuum leak will cause it to perform in the same manner...however all cylinders will be firing..Normally a vacuum leak is easy to pinpoint..however it could be a faulty IAC valve..(IDLE AIR CONTROL)..The idle air control is designed to hold a high idle at start up then slowly bring idle down to proper Rpm.....A faulty TPS (THROTTLE POSITION SENSOR) will also cause a rough running problem..And let's not forget the O2 sensor..(OXYGEN SENSOR)..The O2 sensor controls air/fuel mixture...and yes an exhaust manifold gasket will make it run rough but not too bad...It has a rough running sound more so than causing it to horribly shake..It will shake but not to bad..
it is located at the exhaust side of engine..The exhaust manifold is mounted to the engine exhaust port..the exhaust pipe is mounted to the exhaust manifold and the muffler/cat converter is mounted to the exhaust pipe...You can check the plug wires quickly..With engine running carefully remove plug wires 1 at a time..If the sound of engine gets worse the wire you removed is good..after verifying it is good or bad plug wire back on then pull the next wire..and so on..If you pull a wire off and there is no change in engine operation that is the bad wire..If that is the case change all plugs and wires...One at a time..(It is a good idea to make sure all wires come off easily before starting engine..old wires will come apart easily..grasp wire tightly at boot and twist left to right while pulling..)as far as the other components I spoke as well as many others,the best,easy way is to have it hooked to a scanner and they can check/test all components for proper operation...Now..If it runs good but is shaking the engine/trans mounts are worn as I stated earlier..any loose engine component will cause an engine shake also but you should notice it at a glance...engine mount bolts/nuts being loose can be tightened without changing mounts if caught in time..Trans could be coming loose.also worn clutch will cause vibration...Send more info and I can guide you to remove and replace any faulty components you may find to save you money.........Brooks/Metalpoet.....

May 17, 2014 | 1993 Chevrolet S-10

1 Answer

Van shaking


Have the engine mounts checked. If the van runs OK, and it idles OK except for shaking at idle, it may be loose or broken engine mounts.

May 01, 2014 | Ford Econoline Cars & Trucks

1 Answer

08 vw passat shakes when starting and tps light on


TPS = Throttle Position Sensor
TPMS = Tire Pressure Monitoring System

The TPS is located on the Engine and is part of the Intake System
The TPMS is located INSIDE the Wheel. If you changed the RIM or the Sensor that is normally located inside the wheel is missing, it would cause this. The Weird Noise? Is that an Out of Balance Tire?

We need more information to assist you.

Feb 12, 2014 | Volkswagen Cars & Trucks

1 Answer

Fast idle 90 GMC Sierra


if you haven't disconnected the battery try that next

May 24, 2017 | 1990 GMC Sierra

1 Answer

2001 Montana - Intermittent chugging/shaking at idle and low speeds


There is no way ANYONE can tell you if your engine shaking problem is related to ANYTHING until the cause of the shaking has been PROPERLY DIAGNOSED.

With that said, it sounds to me like you may hve some valve lifters sticking or maybe some broken valve springs. I really do not see how any of the things you listed could be even remotely related to a problem like that. However, once again, we are GUESSING until proper diagnosis proves otherwise.

May 28, 2012 | 2001 Pontiac Montana

3 Answers

What causes 2000 taurus engine rough idle but no codes


remove neg. cable from battery so the ECM will reset this may work. make sure the IAC is air tight. if this doen't fix your problem have someone check the IAC valve if it's bad the part runs $300.00 pluse

Nov 25, 2011 | 2000 Ford Taurus

1 Answer

Code 22 on 95 gmc sierra what does that mean also t will start up but wants to die we replaced idle air control valve and also the throttle position sensor did not fix it i check vaccum lines all good it...


Trouble Code 22 indicates that the Throttle Position Sensor (TPS) is reading abnormally low. TPS volts should be close to 0.42 V at closed throttle and rise smoothly in about 0.02 volt increments to a maximum reading of about 4.85 volts at WOT.
Typical causes for this code include:

1) Maladjusted TPS
2) Defective TPS
3) No +5 volt reference to TPS
4) TPS-return to ECM is shorted to ground or to sensor ground
5) Defective ECM

Good luck, i hope this helps.

Jul 01, 2011 | 1995 GMC Sierra C1500

1 Answer

After the engine start running for sometime it starts shaking.


hi this could be a few things, i would check your idle as a very low idle will cause engine shaking when the engine is near stalling, idle should be around 700rpm approx when warm. If that checks out all good check the leads and that one is not getting worn and causing a misfire or a vaccum hose is not off, both will cause similar problem. The last thing i can think of is a broken engine mount causing problem as when motor idles or runs at a certain rpm it will shake harder and may be the cause aswell

Jun 08, 2011 | 2001 Subaru Legacy

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