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Prev Professional Automotive Repair Technical Discussions for November 30, 2010
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Open Help Requests for GM
Help Request Answers
1992 Cadillac DeVille Touring 4.9L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, sudden timing retard VIN: 1G6CT53B1N
This car runs fine for a few minuites and then retards the timing and also loses consistant spark ( timing light flashes randomly when trying to follow advance curve.)It runs poorly backfiring and spiting back through the intake. PLEASE HELP! :~O
2005 Chevrolet Epica LT 2.5L Stall VIN: KL1VP59L1S
Car cranks, starts then stalls right away. if you give it soem gas when it fires it will rev up, slowly release pedal, and it will idle normally, but if it dips to low in rpm it will stall. Plugs look good, throttle body did not have a lot of carbon, but ran b... Trouble codes: P2101
2008 Chevrolet Express 1500 4.3L cruise control VIN: 1GCFG15X98
customer wants to add Cruise Control can you get a cruise control type turn signal switch and add it or how would you suggest it be done. I would like a factory type installed unit but my local dealer will not provide any info. Just a price for a complete inst...
2008 Chevrolet Silverado 1500 LS 4.8L Poor Idle Quality, Hesitation, Surge, MIL Lamp on VIN: 1GCEC14C08
To all you gm techs out there, i could use a guiding hand on this one. Vehicle came in with dtc p2138 stored and a message stating reduced engine power. I found 1 tsb regarding this dtc and inspected the ip connector to the body harness but all checked out ok.... Trouble codes: P2138 (App sensor 1 2 correlation)
2005 GMC Sierra 2500 HD 6.6L Hesitation, Cuts out, Stall VIN: 1GTHK29285
Truck very sluggish in morning, after 1 or 2 miles runs ok. Drive down highway fine, suddenly goes into "D" rate or limp mode, will not go over 2,000 (RPM) until pulling over and clearing code P1093, then runs ok again for a while then again.. Actual and desir... Trouble codes: P0101, P1093 (Fuel related)
1999 Pontiac Montana 3.4L abs VIN: 1GMDX03E2X
Customer's initial complaint was that when backing out of their driveway in the morning the brake would slip. Their driveway is on an incline and so they have the brake applied while backing out. As they approach the sidewalk at the end of the drive. they woul...
2002 Pontiac Grand Am SE 2.2L timing chain VIN: 1G2NE52F72
Hello, I have an 02 g.dam (2.2) at the day job here that broke the timing chain while on the highway. no compression across all 4 cylinders. i called it as needing a motor to be safe as some info suggests that this could be an interference motor. shop manager ...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac Escalade ESV 6.0L MIL Lamp on VIN: 3GYFK66NX3
Hello all, replaced both cat pipes with GM units. Installed New O2 Sensors. Ran great, fuel trims good, no codes. Talked with customer a week after the repair and he said it runs fine. Calling this one fixed
2007 Cadillac DTS 4.6L Sensors VIN: 1G6KD57Y17
Customer wants vehicle back early this morning, so I don't have any time to play with it anymore. They accept the fact the system is inop as it's been that way for some time and have already been ignoring it. I suspect this tool mentioned in the posts is som...
1995 Chevrolet Tahoe 5.7L Surge VIN: 3GNEK18K3S
Thanks for the help on how this system actually works. A new EGR valve corrected the problem. I won't have this problem again thanks to you folks.
1995 Chevrolet C2500 Silverado 6.5L No Start, Surge, Cuts out, Stall VIN: 2GCFC29S1S
This truck is fixed thanks for all the replies. What was happening was the transfer pump was running while cranking and intermentinly while the engine was running. The injection pump was pulling the fuel from the fuel tank most of the time. What really made it...
2005 Chevrolet Malibu LS 3.5L MIL Lamp on VIN: 1G1ZT55485
Well i was able to get this one fixed. I decided to just bite the bullet and spend an hour or two tracing wires. Well i found the wire broken at the connector behind the left front headlight. I also found a couple other wires there that were about the break... Trouble codes: P0463 (Fuel Level Sensor Circuit Problem), P0826 (Up Down Shift Switch Circuit), P1125 (TP/APP Sensor Circuit Problem), P2120 (APP Sensor 1 Circuit), P2125 (APP Sensor 2 Circuit), P2138 (APP Sensor 1-2 Correlation).
2001 GMC Yukon Denali XL 6.0L Misfire, MIL Lamp on VIN: 3GKGK26U91
Dave, Chris and Alan were right on! Completed a crankshaft relearn and problem is solved. thanks guys! Trouble codes: P0301, P0306.
2004 GMC Sierra 3500 6.6L Cuts out, Misfire VIN: 1GTJK39124
Sorry this one isn't fixed. I have tried to hold out as long as possible to see if anyone else had a fix. Thanks for all the replies. I have traced out entire harness, checked grounds also. Balance rates were all within +2 to -2. All fluids/filters have been c... Trouble codes: 0089C, 380 (Glow plug circuit), 0090A, 193A, P0374 (Timing ref. High resolution signal a no pulse).
2004 Hummer H2 6.0L ride height (rear) VIN: 5GRGN23U94
Replaced compressor w/updated part which is a dual setup instead of single comp setup. test all functions and seems to work great! no directions from gm on new style hook-up of air lines but is not too hard to figure out(requires an airline harness also, whi...
2000 Other GM H1 6.5L Left Rear Hub VIN: 137ZA8434Y
Hi there, we have found a bad left rear axle shaft and a loose run flat in left rear tire. installed new left rear axle and tightened run flat - retested and noise is now gone. Thanks for your help.
2001 Pontiac Grand Am SE 3.4L No Start, Security light on VIN: 1G2NF52E11
Sorry for the delay in closing this one but wanted to be sure it was fixed before closing.Ended up sending to Chevy dealer across the street to have new BCM installed/programed.Customer has had car for aprox. 3 weeks with no return of problems.Thanks for all t... Trouble codes: B2958 (Undocumented code), B2960 (Security system sensor data incorrect but valid), U1000 (Loss of class 2 seriel data), U1088 (Loss of sir sdm communication), U1128 (Loss of irc communication).
1999 Saturn SC2 1.9L engine VIN: 1G8ZY1274X
mornin techs,sorry for the late post.we got too busy,snowed in and then the holiday.we could not fix this car for financial reasons,but you guys hit the nail on the head.the oil rings are gummed up and not sealing.the day i checked it out the water pump dumped...
2002 Saturn Vue 3.0L MIL Lamp on VIN: 5GZCZ63B12
ok I told customer that his pcm was the problem.I did not whant to risk any more of my cash so I did send him to the local GM dealer.they told him the same I told him.//bad PCM.SO For one Thousand dollars they ordered. plus four hundred for labor not bad for G... Trouble codes: P0638 (Trouttle Valve circuit problem.), P2100 (Trouttle vave circuit problem).
2003 Saturn Ion-1 2.2L No Start, Poor Idle Quality, Stall VIN: 1G8AG52F33
Thanks for all the responses. Sorry for taking so long to get back to ya with the holidays and all it got a little crazy around here. Gave the car back to the owner she toke it to the Saturn dealer that from what I understand have put a new computer in the c... Trouble codes: P0509 (IAC fault), P0507 (IAC circuit high).
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