Question about 1998 GMC Sierra

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1995saab900s rough idle

Engine idles rough but system shows okay

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Maybe your service engine soon light bulb is out. Maybe hook the code reader up to it and make sure its not showing anything.

Let me know if you need some more help.

Posted on Jan 02, 2009

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Posted on Jan 02, 2017

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It was very cold, the car sat in the garage for 3 days with very lower fuel, now it idles rough and sounds rough, did I ruin something by not having enough fuel when cold?


No,low fuel isn't your problem. If there's enough fuel for the fuel pump to pick up your car should run okay. You haven't ruined anything. It's not your fault.

It is possible that a low fuel level - very low indeed - has allowed debris/dirt into the system and is causing a blockage. However, I think this is quite unlikely to be the problem you have.

You say the car idles rough - does it drive at speed okay? If it drives okay at speed you can rule out most fuel problems .. most.

Backtrack a bit .. has your car ever ran/idled roughly before? Cold weather can exacerbate a problem.

It could be the cold weather- fuel and injections system have cold start devices or sensors of one sort or another. It may be a faulty sensor. Get somebody to do a diagnostic check for you

Jan 25, 2016 | 2007 Buick Lucerne CXS Sedan

1 Answer

What could be making engine to have a rough idle?


A somewhat rough Idle can be usually found in a three cylinder car, thats okay. can it be tuning? does this happen with the AC on?

Nov 27, 2014 | Cars & Trucks

1 Answer

Low rough idle


no-- plugs will not be the problem. More likely a vacuum leak from a hose left off somewhere. If a carby engine it will be the idle mixture screw out of adjustment check ignition timing is set at the correct advance point

Dec 01, 2013 | Suzuki Grand Vitara Cars & Trucks

1 Answer

When first started idled very rough then died & wouldn't start again


When it starts an idle out smoothly i can drive it okay an when i stop an don't turn it off it idle perfect , But, if i turn off the engine it may NOT start again,To get it started i have to use the start system of the battery charger to start the car?
Can anyone help me out?

Aug 02, 2013 | 1992 Chevrolet Corvette

1 Answer

1993 chevy caprice with a 32 dtc code?


Code 32 is the egr system, if you are getting a rough idle then this may be your problem, check the EGR valve, this system has a few parts the valve and the vacuum control solenoid , the valve may be bad or have carbon stuck in pintle or solenoid is bad and allows vacuum to open it at idle when it is not suppose to. try to remove vacuum line and see if idle smooths out if not remove the valve and see if it is open, if it is something you can clean then do so otherwisr replace it and also the solenoid.


when you remove the valve start the engine it will rev high but thats okay, with engine running you will see two ports, one should have vacuum and the other exhaust, make sure they are not plugged, if so unplug them. start with this.

Oct 24, 2012 | 1993 Chevrolet Caprice

1 Answer

2003 expedition idles rough


If the check engine light is on I would check for trouble codes first.
If not, look for a vac leak or low fuel pressure.

Jul 24, 2012 | 2003 Ford Expedition

1 Answer

5.3 liter Chevy engine #1 Cylinder not firing at idle


My opinion...

Year? Miles?

There's no way I'd dive into a "HEAD GASKET"
diagnosis without pressure testing the cooling
system and (wet/dry) COMPRESSION testing
the whole engine...

Even if it is a "HEAD GASKET"... the entire engine
might be ready for a REFRESH... and tossing a new
Head gasket into a TIRED ENGINE not insubstantial
(a lot of wasted time & money)...

Come back with some compression numbers...

but don't bother with any of this if your engine oil has water in it.

(in my opinion)

Carnac the Magnificent

Apr 04, 2017 | 2005 Chevrolet Silverado 1500 2WD

1 Answer

Rough engine idle


you don`t say if you have checked anything so start with the plugs for condition and age as well as plug gap.then the ignition wires they may need changing.the engine compression can affect idle and give the impression its alright at higher speeds.fuel injectors if they are dirty can cause rough idle and run okay at higher speeds.just somethings to check

Jan 11, 2012 | 2004 Pontiac Sunfire

2 Answers

I have a 325bmwxi that is idleing roughin drive


bmw should NOT SHAKE THE STEERING WHEEL AT ADLE. OK SOUNDS LIKE ITS RUFF UNDER LOAD LIFT THE HOOD AND CHECK FOR A HISSING SOUND IF SO IT IS VACUUM LEAK. MOST COMMON. iF TAHAT ISNT IT LETS MAKE SURE ITS IDLEING AT 800 RPM IF HIGHER PLEASE PUT ON FORM HERE AT FIX YA AND WE CAN WORK THIS OUT CHECK IDLE, CHECK ENGINE LIGHT, AND THEY ARE BAD AT NEEDING MOTOR AND TRANS MOUNTS MY BET WOULD BE ON MOUNTS

Feb 12, 2010 | 2004 BMW 3 Series

1 Answer

Idles okay, runs rough when gas applied


Either a bad MAP sensor, or TPS. What is the code for the check engine light? This will most likely tell you what it is.

May 27, 2009 | 1994 Chevrolet C1500

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