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Prev Professional Automotive Repair Technical Discussions for July 12, 2012
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Open Help Requests for GM
Help Request Answers
2000 Cadillac DeVille DHS 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6KE57Y5Y
Hello all Just got done doing head gaskets and timeserts started vehicle and noticed right away that it had a misfire at idle and the MLS light was on. Increased rpm to around 1800 and noticed engine smoothed out. Checked for a misfire with the scanner, code p... Trouble codes: P0300, P0436
1996 Chevrolet Cavalier LS 2.2L engine VIN: 1G1JF5244T
This car with fire with gas pedal to the floor and cranking it sounds like it is flooded but plugs are dry and oil is ok. Replaced ignition module with used one does the same thing. Once the scanner would not communicate then suddenly did. The Theft System lig...
1997 Chevrolet Venture 3.4L Electronic VIN: 1GNDX06E2V
A/c system have dual system. Automatic controls Rear a/c works great. The problem is the front a/c blows luke warm air and a little bit of cold air can be felt at the fascia. Touching the a/c at the inlet of evaporator is ice cold, coming out is warm to touch....
2006 Chevrolet Silverado 2500 HD LT 6.6L glow plug light on VIN: 1GCHK23DX6
This truck came in with glow plug light on all the time. Traced wiring communication wires out from TCM to GPCM and found a broken wire-repaired broken wire, ohmed wires out to make sure that they were not open, grounded or shorted to voltage. Also checked con... Trouble codes: U0106
2006 Chevrolet Cobalt LT 2.2L Tcm VIN: 1G1AL15F26
vehicle came in with evap code po496. fixed that problem and took it on a test drive, now vehicle has code u0101 lost communication with tcm. anyone have any idea? need help.
2003 GMC Savana 2500 5.3L Misfire VIN: 1GTFG29TX3
Repaired Van 2 weeks ago for same issue. It is now back P0300. All cylinders are misfiring. Fuel trin 120 to 132 both banks at idle. Miss at lower rpms only. Fuel pressure 57psi KOEO. Engine runs great cold. Do these plastic manifolds crak on or warp and leak?... Trouble codes: P0300 (random cyl missfire)
1999 Saturn SC2 1.9L Stalls VIN: 1G8ZG1278X
Customer's car will stall intermediately- Everytime the fuse for the fuel injectors will blow. 10 amp fuse in underhood fuse block. Checked schematics- fuse only powers the injectors- no other power feed to anything else. Ohm tested injectors- nothing wrong.. ...

Fixes & Summaries for GM
Fix/Summary Answers
1967 Chevrolet C10 Pickup 5.3L 3-2shift
I extended the the arm on carb for the tv in ordered to get more throw. I was able to adjust it so we had a very minimul clunk on downshift and good upshift timing. Customer said it would pass. I am still disappointed with the way it works because it shifts...
2000 Chevrolet Impala 3.4L No Start, Stall VIN: 2G1WF55E1Y
Thanks everyone for your replys! The problem as described to me from the beginning was very odd. The problem was the vehicle would run fine until you had to re-fuel then it would run very rough and start and fall dead. I finally found the problem and that is t...
2005 Chevrolet Impala 3.8L Stall VIN: 2G1WF55K55
Customer has decided to "get rid of this dog" (his words not mine), we could never really find what were losing when the vehicle would stall. The only thing we found was a occasional wierd cmp sensor pattern, we replace cmp sensor and checked the magnet on the...
1999 GMC Yukon Denali SLE 5.7L No Start VIN: 1GKEK13R7X
Everything is still doing what it is supposed to do, so I can't check for the suggestions from you guys. Thanks for all the help. If it fails again, I'll try some of the ideas and let you know. Thanks again. I just love intermittent problems.
2002 GMC Sonoma SLS 4.3L No Start VIN: 1GTDT13W82
Thanks to all that replied. after truck running good for a week it went down again and was able to verify the fuel pump. Thanks again
2004 Pontiac Grand Am SE1 3.4L Poor Idle Quality VIN: 1G2NF52EX4
Car has been running normal for three weeks now. Replaced engine computer, and returned car to customer. Talked with her today and she says everything is good. The TP percentage is a calculation the ECM makes based on TP voltage. At .64 volts the ECM should ha...
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