Low Idel 6.0
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CF Beginner
Joined: Sep 2010
Posts: 1
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From: Maryland
Low Idel 6.0
I have a 2003 Silverado 1500HD CC SB with quadrasteer and the 6.0. I was wondering if anyone has had an idling problem. For some reason my truck is idling under 500 rmp's and it is very rough. Most of the time it kicks the AC off because it can't handle the load of it running. At ONE time (been taken off for a long time) I had the Hypertech Max Energy E-Con on the truck. I even plugged it back in to see if it was still on there and it said factory programming. What a waste of my money that was but wont go into that. Anyone have any clue what might be a fix to said problem. My mechanic says nothing is wrong with the truck, could try to clean the one sensor and run cleaning fluid through the injectors but that is all. He also said that GM lets the computer decide on the IDLE speed through the computer and that does not make me happy since I would tell it to run 750 and be done with it. Any help would be great. Thanks guys!
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Professional Mechanic
Professional Mechanic
Joined: Nov 2008
Posts: 2,950
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From: Bowie, MD
Take it to a real mechanic if it idles too low something is wrong and it can be fixed. First thing to do would be to clean the throttle plates.
Bulletin No.: 04-06-04-040
Date: June 14, 2004
TECHNICAL
Subject:
Idle Instability, Low or Rough Idle with Electronic Throttle Control (Clean Throttle Body)
Models:
2002-2003 Cadillac Escalade, Escalade EXT
2000-2003 Chevrolet Silverado, Suburban, Tahoe
2002-2003 Chevrolet Avalanche
2000-2003 GMC Sierra, Yukon, Yukon XL
with 4.8L, 5.3L or 6.0L V8 Engine (VINs V, T, Z, N, U - RPOs LR4, LM7, L59, LQ9, LQ4) and Electronic Throttle Control
Condition
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. Refer to Engine Controls Repair Procedures - Throttle Body Cleaning Procedure. 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. For 2003 model year vehicles, look in the operating system portion of the calibration. For 2000-2002 model year vehicles, look in the engine portion of the calibration. If not, then update the PCM calibration to the latest calibration
Bulletin No.: 04-06-04-040
Date: June 14, 2004
TECHNICAL
Subject:
Idle Instability, Low or Rough Idle with Electronic Throttle Control (Clean Throttle Body)
Models:
2002-2003 Cadillac Escalade, Escalade EXT
2000-2003 Chevrolet Silverado, Suburban, Tahoe
2002-2003 Chevrolet Avalanche
2000-2003 GMC Sierra, Yukon, Yukon XL
with 4.8L, 5.3L or 6.0L V8 Engine (VINs V, T, Z, N, U - RPOs LR4, LM7, L59, LQ9, LQ4) and Electronic Throttle Control
Condition
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. Refer to Engine Controls Repair Procedures - Throttle Body Cleaning Procedure. 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. For 2003 model year vehicles, look in the operating system portion of the calibration. For 2000-2002 model year vehicles, look in the engine portion of the calibration. If not, then update the PCM calibration to the latest calibration
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