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2003 Chevy Impala Stalling, Rough Idle (lopes), Misfire

Tiny
IMPALA2003
  • MEMBER
  • 2003 CHEVROLET IMPALA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 80,000 MILES
My car has been stalling quite consistantly after driving for about ten minutes of use, the car usually wont restart right away, but if I let it sit for five minutes or so it will start again and will get a few more minutes of driving. The engine idles rough from about 500-1100 rpm and often feels like its just about to die. I get a scan code for a misfire on cyl 5 and only that cyl and seems to be intermittent. I have replaced the spark plugs, wires, swapped coils for testing, new fuel filter, had injectors and engine combustion chamber cleaned of carbon, and a new catalayic converter put in. Any help or direction would be appreciated
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Wednesday, May 27th, 2009 AT 8:35 PM

8 Replies

Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Have you performed a compression test on the cylinder. You may have a bad head gasket, a burned valve, ect. Do that and let me know what you find
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Thursday, May 28th, 2009 AT 7:39 AM
Tiny
IMPALA2003
  • MEMBER
  • 4 POSTS
Last time the car was in the shop for this issue, they noted that compression on cylinder 5 was above 3,

I though thats why they were trying to get rid of the carbon?

Also they tested the resistance on the injectors 3, and 5 which came out to be the same.
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Thursday, May 28th, 2009 AT 3:56 PM
Tiny
RHALL77
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  • 3,361 POSTS
Do you mean the compression was higher than cylinder #3
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Friday, May 29th, 2009 AT 8:19 AM
Tiny
IMPALA2003
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  • 4 POSTS
Yeah, the compression on cylinder 5 was comparatively higher than that of cylinder three.

I assume that was the only two they compared for testing.
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Friday, May 29th, 2009 AT 4:53 PM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Do you know if anyone has tried to run gm top engine cleaner in the injectors yet.
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Saturday, May 30th, 2009 AT 12:55 PM
Tiny
IMPALA2003
  • MEMBER
  • 4 POSTS
Don't know about the gm top end engine cleaner,

but it did have a motor vac fuel injection system flush and clean, last time it was in. That it for cleaning the injectors that im aware of.
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Sunday, May 31st, 2009 AT 12:41 AM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
I would highly suggest using this to clean your injectors. The stuff works wonders if there is a plugged injector
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Sunday, May 31st, 2009 AT 5:02 PM
Tiny
TAKECHARGESARGE
  • MECHANIC
  • 92 POSTS
You might try looking at the Crankshaft Position Sensor. I had a similsr problem with the engine stalling for no apparent reason and no check engine light. After the Crankshaft Position Sensor was replaced, the car didn't stall anymore.

TakeChargeSarge
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Friday, July 31st, 2009 AT 10:30 PM

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