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

2003 CHEVROLET IMPALA
80,000 MILES • 6 CYL • FWD • AUTOMATIC
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IMPALA2003
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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
May 27, 2009 at 8:35 PM
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RHALL77
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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
May 28, 2009 at 7:39 AM
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IMPALA2003
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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.
May 28, 2009 at 3:56 PM
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RHALL77
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do you mean the compression was higher than cylinder #3
May 29, 2009 at 8:19 AM
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IMPALA2003
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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.
May 29, 2009 at 4:53 PM
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RHALL77
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do you know if anyone has tried to run gm top engine cleaner in the injectors yet.
May 30, 2009 at 12:55 PM
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IMPALA2003
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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.
May 31, 2009 at 12:41 AM
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RHALL77
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i would highly suggest using this to clean your injectors. the stuff works wonders if there is a plugged injector
May 31, 2009 at 5:02 PM
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TAKECHARGESARGE
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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
Jul 31, 2009 at 10:30 PM