Question about 2000 Chevrolet Malibu

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I have put a new egr valve on truck runs rough on idle.but sometimes it runs with no shaking

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  • Chevrolet Master
  • 2,428 Answers

It could be a number of things .What kind of difference did the EGR make don't need to answer just big or small .
Their is a part not a sensor on the throttle body called the IAC ideal air control behind the TPS sensor .Its a stepper motor jack screw moves in and out to regulate the amount of air at ideal has a composit rubber seal at the end of the shaft that fits into a seat inside the air horn .The Vcm controls the movement .Carbon build up on the seal or seat will effict the ideal air flow make it run rough at ideal.
You can remove it 2 small bolts and try to clean it but don't push or pull on the shaft it will damage the motor .
Truthfuly I think its a bad disgin to much heat to many varibables to tight tolarances to much expantion and contraction not a good enough seal or control over the system.

Posted on Apr 16, 2015

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1 Answer

Wher egr value located


Here's a link to a picture of what the EGR look's like,it's at the back of the engine,easy to remove.When bad, vehicles can experience poor engine performance, poor idle, high NOx emissions, failed emissions test, hesitation, engine surging http://www.autozone.com/emission-control-and-exhaust/egr-valve/duralast-egr-valve/volvo/960/1995/6-cylinders-9-2-9l-efi-dohc/857098_162245_0

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Will a egr valve cause rough idle


Yes the car won't run properly with a bad EGR valve and will use a lot more gas as well.

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Hesitation on acceleration


Can be egr valve, enginge usually shakes back and forth like a huge miss most times. I would definatly check in this order: fuel filter, fuel pump. Sometimes the pump may run, but be too weak to run an engine at speed or under load. If you replace the filter and pump, and it still don't help, then at least you know for sure its not the pump or filter, and move on to the egr, vacuum leaks, etc. Sometimes its a "search till you find it" type thing.

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Car is idling rough sometimes, had it on a machine that said it was the egr valve we put one on and it is still idling rough at times said either egr valve faulty , blocked egr passage egr boost sensor...


make sure you check the whole egr system,including,egr solenoid,egr feedback sensor,evp,all of them have to be allowing sufficient flow,just replacing the egr might not correct.also check and clean the isc sensor could be faulty or dirty,that controls your stable idle.









TIM.......

Oct 23, 2010 | 2002 Ford Explorer

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My 91 oldsmobile 98 runs rough in idle but when driving run smooth.


Rough idle is a very common problem on 4 cylinders, but I believe the 98 Regency has a 6 cylinder in it, right?

Sometimes the coil packs get iffy, and sometimes the EGR Valve gets a leak in it causing a rough idle.

When the accelerator pedal is depressed, it can change things so that the engine seems to run smoothly.

However, I would look for codes to see if anything intermittent is occurring in the engine that may need attention.

The OBD-I scanner can help to diagnose the problem, if anything is out of specifications on the engine in question.

The owner will have to find a technician that has such a scanner.

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Car idles rough in park also runs rough in overdrive


Sometimes a rough idle like that is a fuel filter. As you've already done the plugs and wires the fuel filter would be my next bet.

Mar 15, 2010 | 1993 Buick LeSabre

1 Answer

Shakes while idling and sometimes stalls.


check for minor vacuum leak and map sensor,pcv,egr valve

Oct 13, 2009 | 2001 Chevrolet Blazer

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Engine light says egr problems


i would still try to change your egr!!! sometimes egr test good but still they can stick open and that can cause idle problems so if you want to get your prob fix change egr valve
take that egr off and put in a new one !!!!

Have a great day

Denis

Dec 13, 2008 | 1989 Ford Ranger

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