2002 GMC Sierra Engine is missing

GDOAKS

MEMBER
2002 GMC SIERRA
V8
AWD
AUTOMATIC
90,000 MILES

Stock 6.0 Liter is missing, will occasionally die at slow speeds (generally left turns, parking, U-turns etc.) Spark plugs and wires have been replaced with bosch sets

Saturday, August 8th, 2009 AT 11:17 AM

3 Replies

BRIAN 1

MECHANIC
1,030 POSTS

I would start here first, Some owners may comment on an idle instability, low idle speed or rough idle.

Cause
Condition may be caused by deposits in the throttle body bore.

Correction
Clean throttle body bore and throttle valve plate of carbon using a shop rag and an appropriate cleaner. This procedure may be performed at any mileage necessary. Check to determine if the PCM calibration has been previously updated to one that includes the update for throttle body coking. If not, then update the PCM calibration to the latest calibration. Try this first.

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Saturday, August 8th, 2009 AT 12:40 PM

GDOAKS

MEMBER
7 POSTS

I did that today. Will see how it runs tomorrow (drove about 2 miles and felt alot better though). There was quite a bit of buildup on the intake side of the throttle body is that indication that there is another problem that may need to be addressed

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Sunday, August 9th, 2009 AT 10:05 PM

BRIAN 1

MECHANIC
1,030 POSTS

Cant say its another problem, but I would atleast see if this vehicle has the latest calibration in the ECM which would correct the rest of the problem.

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Monday, August 10th, 2009 AT 5:46 PM