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Prev Professional Automotive Repair Technical Discussions for July 23, 2015
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1995 Chevrolet P30 6.5L Excessive Emissions, No Start, Hard Start VIN: 1GBKP37F5S
This motorhome has a hard time starting in the morning. It tries to fire but just smokes a lot of white. After a few tries it will start and run rough for a second or two. Once warm starting is no issue. This issue has gotten much worse after the head gasket j...
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1997 Chevrolet Express 1500 5.7L No Start VIN: 1GNFG15R8V
The van came to us with a no power , it will idle good but has a hard to start cold. We replaced the dist, cap and rotor ( it was burnt badly on the rotor button , we still had a low power so we took fuel pressure readings, they were lower than the reading i p...
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1999 Chevrolet C1500 LS 5.0L No Start, MIL Lamp on VIN: 1GCEC19M8X
I have no communication with Passlock module & have tested powers & grounds at module & everything is there (switched & unswitched).It had a moment & started,so I removed EVO module & security light is gone & it starts every time in allowed fuel mode,but I am ... Trouble codes: P1626 (VTD data missing), U1192 (VTD module data loss)
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2003 Chevrolet Suburban 1500 LT 5.3L Stability Control System VIN: 1GNFK16Z93
customer complaint is that the abs activates when going around turns. mostly to right but does do it to the left as well. had code stored for erratic left front wheel speed signal. confirm signal was erratic. replaced left front wheel hub assembly. on road tes...
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2001 GMC Yukon XL 1500 Denali 6.0L Hesitation, reduced power VIN: 1GKFK66UX1
Ok folks, I would like to say thanks up front for the help. This is my personal Yukon Denali XL 2001 with a 6.0 liter AWD. I own a shop and spend all my days working on vehicles. Usually I can diagnose any issue that confronts me but this is one of this I cann... Trouble codes: P1221
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Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac Seville STS 4.6L idles at 2000rpm VIN: 1G6KY5499X
PCM had failed. Somehow the PCM had an internal failure causing lack of control on the IAC Trouble codes: P0601.
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2004 GMC Sierra 1500 SLE 5.3L Excessive Emissions, Poor Idle Quality VIN: 2GTEK19T44
The B1S1 sensor indicated 30mv with KOEO so I changed that sensor and started the truck. That sensor was reading normal but the B2S1 sensor went to 0mv so I replaced that one too. Now everything is good, I didn't see any damage to the sensor so I'm not sure wh... Trouble codes: P0171, P0174.
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