Question about 2004 Chevrolet Impala
2004 Impala SS 3.8 Supercharged. When you first start the car, it will start to idle rough, sometimes it will die. The boost gauge starts to climb when it starts running rough. I can fully depress the accelarator several times very quickly & it will clear up. ALL the sensors, except the temp. sensor, have been changed. The fuel pressure checks good. It is not throwing any codes. I have had it in the shop(where the sensors were changed), plugs & wires have been changed. They said the only thing left was the ECM.
There is a Recall on some models Catalytic Converter. 03 for sure, and it was covered under warranty up to 80,000 miles. Check with Dealer for replacement ($1500.00 was the ridiculous warranty bill) .If your car is over 80,000 miles then i suggest going to a smaller local garage and having the work done. shop around first, shop online Google the part and should get the cheapest listings with Free shipping. possibly $200-$400 plus installation labor at a good mechanics shop. Always shop for the best mechanic, that warranties his work. Muffler shops will generally be higher, but fast service.
Posted on Nov 29, 2012
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Posted on Jan 02, 2017
Make sure there is no vacuum leaks.
Vacuum leak at intake manifold and vacuum hose.
Bad Idle Air Control Motor (IAC)
Low compression (170 psi + is OK)
Start cleaning and repair these trouble spots and see is there any improvement.
For more advance DIY'er then you may try this.
Use a can of Berryman carburetor clean to locate the vacuum leak.
SEE SAMPLE PICTURE HERE
This is a 20-30 minutes job.
Vacuum leaks can occur in following locations.
Intake manifold AND/OR vacuum lines.
Intake manifold is not accessible unless the engine head if off.
You can still check the potential leak by spraying some Berryman near the intake manifold.
Listen for rpm increase after you introduce the Berryman (FUEL) at idle.
Do the same starting from the brake booster unit (the round unit) on the drive side fire all.
Carefully listen for increase of RPM right after to spray the Berryman to the potential vacuum spot.
Get a friend to HEAR the RPM increase or monitor for RPM on the tech.
DO NOT AIM the Berryman into any heat source.
PLEASE RATE my answer if it is useful to you.
Posted on Dec 17, 2009
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