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Prev Professional Automotive Repair Technical Discussions for September 28, 2012
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Open Help Requests for GM
Help Request Answers
2003 Buick Century Custom 3.1L Misfire VIN: 2G4WS52J63
Some much for easy. Car came in for rough idle. Found #3 cylinder misfire counts rising quickly. Scope tested ignition system and could see #3 pattern was different. Look lean. Scoped injectors and all patterns looked the same. Flow tested injectors and all ga... Trouble codes: P0300 (Misfire detected)
2003 Buick LeSabre Limited 3.8L evaporator VIN: 1G4HR54K83
has anybody seen this
2000 Cadillac DeVille DTS 4.6L 2-3 Shift Solenoid VIN: 1G6KF5793Y
I am posting this although i have already repaired it, because i could not find another vehicle with a p1845 code. Trans would not shift & stuck in limp. Checked solenoids (common problem) but they were ok. Found broken control wire from pcm term #45 (yellow/b...
1991 Chevrolet Corvette 5.7L Poor Idle Quality VIN: 1G1YY338XM
Hi Techs. I have this 91 Corvette with the 5.7 multipoint injection. It has a stumble at idle randomly. It acts like a missfire. It idles fiarly good but every couple of seconds it stumbles and then recovers. It needed a tune badly so I did one complete with n...
1998 Chevrolet Tracker 1.6L speedo
need help finding a speedo cable gear that goes into the transfer caase any ideas. i have looked on speedo world and asked multiple junk yards to sell me theres from a transfer case but only one would sell it and it was the wrong color gear i need the one that...
1999 Chevrolet Silverado 1500 5.3L lights VIN: 2GCEC19T4X
The truck came in with no high beams, no low beams, and no daytime running lights. I've checks all the fuses and relays, and those are good. I've found that the ground circuit(s) are the problem. I can ground each bulb at the bulb, and they come on. If I groun...
1999 Chevrolet Tahoe LS 5.7L No Start, Poor Idle Quality VIN: 1GNEK13R0X
Morning all, Got this Tahoe from another shop that rebuilt the engine wouldn't start check cam retard -40 restab dist. now -1 very hard to start and wont idle wont rev to the rpm limiter so wont do a relearn procedure, spark advance at 255 until rpm gets to 15...
1999 Chevrolet Tahoe 5.7L cyl 3 VIN: 3GNEK18R5X
thanks in advance for all help and suggestions. i don't understand what could have gone wrong, pulled upper intake to convert injectors to mfi, completed job. upon start up, heard instant rattle/slap/ or knock. cylinder 3 now has misfire. compression test dry,...
2000 Chevrolet Camaro Z28 SS 5.7L Excessive Emissions VIN: 2G1FP22G6Y
This vehicle came in after multiple smog check failures and the customer working on it himself and taking to other shops.after scaning it we found that the egr tested good,air injection not coming on-relay bad-replaced that,hose for air inj. To engine twisted-... Trouble codes: P0410 (Air injection pending), P0405 (Egr sensor low volt history), P0410 (Air injection pending), P1416 (Air injection bank 2 history)
2001 Chevrolet Impala LS 3.8L Cooling fans VIN: 2G1WH55K11
This car has an intermittent cooling fan operation. It was driven in overheating. I can manually control the fans with my scan tool and cut them on. I replaced the ECT and it worked fine. Customer drove it a few days and it overheated again and at the same tim...
2006 Chevrolet HHR LT 2.2L Unkown VIN: 3GNDA23D56
HHr that suddenly won"t take gas at station.Vent solonoid test ok.canistor & hoses not restricted.Will not fill even with all hoses off canister & valve.Small check valve in tank neck looks ok but don"t understand it"s operation. help please.
2007 Chevrolet Silverado 2500 HD LT 6.6L Hesitation, Cuts out, MIL Lamp on VIN: 1GCHK23677
Hello all. This truck will not set the code for me, it seems the customer gets it to do it at least once a day. He states the MIL comes on, truck runs rough no power. Sometimes even has to pull over and restart it. Then when I get it, it only has that EGR code... Trouble codes: P0405 (EGR Low Position Fault)
2008 Chevrolet Express 3500 6.6L Cac Piping VIN: 1GBJG31688
Wanting to check around and see if any body else has run into this problem. First off i am posting this for a friend that's having problems. His van has blown the cac tube off the turbo repeatedly. The first time it happend he took it to the dealer and they cl...
2006 Hummer H3 3.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 5GTDN13636
I am having trouble finding a definitive answer to why this vehicle has a misfire on cyl #2 at an idle. The code I have is for a random misfire but watching it on the modis shows cyl #2 missing all the time at an idle. I swapped the ignition coils, swapped the... Trouble codes: P0300, P0128
2006 Pontiac G6 GT 3.5L engine VIN: 1G2ZH55816
Engine has been replaced due to broken piston ring. on occasion it will stall turn the key warning light will come on but car will not crank. after sitting for 1 or 2 minutes will crank and start fine Only has done this 3 times. No warning, might go for a week...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Chevrolet Cavalier LS 2.4L Cuts out VIN: 1G1JF52T3V
2000 Chevrolet Cavalier 2.2L Surge, Cuts out, Misfire, MIL Lamp on VIN: 1G1JC124XY
You guys all hit the nail on the head,Thank You.I had scoped the 7x reference signal going to the PCM,it looked the same when the car was acting up and when it ran OK.After reading your replies I started looking real good at the wiring.After I wiggled the har... Trouble codes: P0300.
2004 Chevrolet Silverado 1500 5.3L A/C Compressor VIN: 2GCEK19T54
Thank you one and all for your input. Some of you said this is normal, others said it wasn't. I decided to install the toggle switch so I can control the compressor clutch. I put the toggle on the low pressure cycling wire behind the control moduale, the light...
2004 Chevrolet Avalanche 1500 Z66 5.3L Steering VIN: 3GNEK12T74
Thank you to Mithell and Tim who both suggested flushing the fluid. You were right on. Flushed it and filled with clean GM fluid and the problem was gone. Thanks Again.
2004 Chevrolet Silverado 2500 HD 6.6L Excessive Emissions
Thanks for everyone's help. We decided to replace the line and leave the injector alone for right now. I assembled it and it's not leaking right now. He just didn't want to spend the money on injectors as I told him if you're going to do one with these miles...
2008 Chevrolet C5500 Kodiak C5C042 6.6L check engine code po101 VIN: 1GBJ5V1928
After going through every step in the GM repair manual to correct the po101 code.One step mentioned about the egr valve (if open during inspection,replace the egr valve)This was a previous repair done just before the po101 code problem started.Upon inspection,...
2009 Chevrolet Malibu LT 3.6L Misfire, MIL Lamp on VIN: 1G1ZJ57799
I am calling this one fixed even though we technically did not fixed it.By wiggling the harness between the main harness at the valve cover and the coil the misfire came and went. So it needs a coil pigtail and a cat or cats? Reason for not "fixing" this vehi... Trouble codes: P0300, P0353.
2002 Pontiac Grand Prix SE 3.1L Cooling Systems VIN: 1G2WK52J32
we have installed a gm sender and appears to have fixed the probelm. thanks for all replys. bruce
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