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
Do you
have the same problem?
Yes
No
Wednesday, May 27th, 2009 AT 8:35 PM

8 Replies

Tiny
RHALL77
  • MEMBER
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
Was this
answer
helpful?
Yes
No
Thursday, May 28th, 2009 AT 7:39 AM
Tiny
IMPALA2003
  • MEMBER
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.
Was this
answer
helpful?
Yes
No
Thursday, May 28th, 2009 AT 3:56 PM
Tiny
RHALL77
  • MEMBER
Do you mean the compression was higher than cylinder #3
Was this
answer
helpful?
Yes
No
Friday, May 29th, 2009 AT 8:19 AM
Tiny
IMPALA2003
  • MEMBER
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.
Was this
answer
helpful?
Yes
No
Friday, May 29th, 2009 AT 4:53 PM
Tiny
RHALL77
  • MEMBER
Do you know if anyone has tried to run gm top engine cleaner in the injectors yet.
Was this
answer
helpful?
Yes
No
Saturday, May 30th, 2009 AT 12:55 PM
Tiny
IMPALA2003
  • MEMBER
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.
Was this
answer
helpful?
Yes
No
-1
Sunday, May 31st, 2009 AT 12:41 AM
Tiny
RHALL77
  • MEMBER
I would highly suggest using this to clean your injectors. The stuff works wonders if there is a plugged injector
Was this
answer
helpful?
Yes
No
Sunday, May 31st, 2009 AT 5:02 PM
Tiny
TAKECHARGESARGE
  • MEMBER
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
Was this
answer
helpful?
Yes
No
+1
Friday, July 31st, 2009 AT 10:30 PM

Please login or register to post a reply.

Recommended Guides