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Prev Professional Automotive Repair Technical Discussions for February 4, 2005
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Open Help Requests for GM
Help Request Answers
1999 Buick Century Custom 3.1L Cooling Systems VIN: 2G4WS52MOX
Hi All, I have this Buick here that has a coolant leak on the back side of the motor. It looks like it is coming from the bottom of the lower intake manifold and leaking under the themostat housing. I checked to see if the housing was leaking and it is not. I ...
1987 Cadillac Brougham 5.0L AC and Heat VIN: 1G6DWS1Y4H
Hello Techs,I can use your help on this one. Customer brought vehicle in to fix the heater blowing cold.We checked vacuum to heater control valve, none found,smoke tested vacuum line,leak found at plug on the vacuum unit under dash.Repaired vacuum leaks.Replac...
2002 Cadillac Escalade 5.3L stability system VIN: 1GYEK63N82
to all you great techs and soon to be great techs, we have this escalade in and just replaced the transmission with gm unit. reverse had gone out. now, the "service stabilty system" message is on. cust. states it was not on before wrecker picked it up. I don't...
1975 Chevrolet C30 Cheyenne 7.4L valve train VIN: CKY145F426
This is an older vehicle than everyone here is prebably used to but its really turning into a pain for us. The customer origonally brought the vehicle in for a running rough diagnosis. After setting the carb and timing and hooking up our scope we dscovered tha...
1991 Chevrolet Caprice 5.0L compass
This vehicle was just purchased by a friend and the compass in the rearview mirror is not accurate. The owners manual talks about recalibration, but does not say how to do it! My info at the shop doesn't touch on this at all so I was hoping that one of the fin...
1993 Chevrolet Lumina APV 3.1L No Start, Cuts out, Stall VIN: 1GBDU06D4P
this van came in no start cust said when he drives coil will blow out replace it it will idle all day . as soon as you start moveing it will stall & not start untll you replace coil again but still has injector pulse just no spark . i have a good motor ground ...
1996 Chevrolet Monte Carlo LS 3.1L MIL Lamp on VIN: 2G1WW12M4T
I have a contiunous code P0341B( cam sensor perf. fault). I replaced the sensor. The car runs fine, and even with the sensor disconnected, I t runs, Ok, and sets the same code. Scan data shows NO, for cam signal when running, and YES with key on engine off. Th... Trouble codes: P341
1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1JC1242V
the car came in driven from out of state. the customer told me that it was in a shop and the tech said that the no 4 injector was bad because there was gas in the oil. he replaced just the injector seals and changed the oil. at the time the customer wouldn't c... Trouble codes: P0301
1998 Chevrolet Express 3500 5.7L No Start VIN: 1GBJG31R5W
This van was towed in as a start, and dies after 10 minutes. Was told by the customer that they let the van sit for 2 months before bringing it in. It is a no to very hard start now. When it was running, it would die immedietly if the throttle was released, an...
1999 Chevrolet Venture LS 3.4L abs module VIN: 1GNDUO3E5X
2001 Chevrolet Silverado 1500 4.3L No Start VIN: 2GCEC19W21
Hey guys have a hair puller, this truck was towed in had very weak spark, replaced cap and rotor, spark came was now normal, but we have no ground signal from computer to ijectors. fuel pressure is good. Of corse mitchell says replace computer, we did 2 differ...
2001 Chevrolet Camaro Z28 SS 5.7L Starter VIN: 2G1FP22GX1
This one is defently different! Came in with starter mounting broken off block. (aluminum block) Engine turns over fine with wrench. Broken piece was welded (By professenal welder) back on and starter replaced. Cranked over half turn locked and broke starter m...
1993 GMC K3500 Sierra 5.7L carrier case
this post is to ask if some sharpened edges of the right axle drive gear is just normal wear or if there is a pending failure. the customer has no complaints, the veh. was at another shop for service when they noticed a clunk and upon inspection thought the pi...
1994 Oldsmobile 88 Royale LS 3.8L hard start, code set VIN: 1G3HY52L8R
this car's been coming in for the last 6 months with intermittent hard start & check engine light on. It happens very intermittently (every 2, or 3 days). And both symptoms don't always occur together, sometimes it'll start ok & the check engine light will be ... Trouble codes: P0321, P1361
2001 Pontiac Grand Am GT 3.4L head lights VIN: 1G2NW52E51
grand am 2001 no low beam headlights We cant test body modules, dont think it would do any good on this beast. Its been at other shops now here on a friday afternoon. Theres been inapropriate wiring done at one headlight which is most likey the cause. We check...
1996 Saturn SL2 1.9L Coolant VIN: 1G8ZJ5275T
This Saturn orginaly came in for a New York Inspection. It had a EGR code. I cleaned the EGR valve and reset the Computer. I Instructed him to drive it a few days to complete the readyness tests. After a month the monitors were still not complete. I then notic...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Cadillac Seville 4.5L Cuts out, MIL Lamp on, backfires VIN: 1G6KS5156J
Dennis in Utah nailed it. I decided to replace the plug wires because it seemed like a secondary ignition problem, in so doing I found #3 spark plug loose and the electrode burn't clear off. I pulled & checked the other 7 plugs, all ok. I still Can't beleive o... Trouble codes: P0038, P0037.
1990 Cadillac DeVille 4.5L MIL Lamp on VIN: 1G16CD1331
sorry it took so long to get back to this, but customer took car on a trip and i was waiting for him to return. while gone i guess the check engine light went off. im thinking possibly an intermittent problem, but we told the customer to bring it back if the l... Trouble codes: 48 (egr control problem).
1996 Chevrolet Astro 4.3L Excessive Emissions, Poor Fuel Economy, MIL Lamp on VIN: 1GBDM19W2T
i finally fixed this one and it turns out there was an o-ring seal jammed into the return line cavity.because it was black and the injector cavity is black plastic it was camouflaged quite well.the owner probably has some credit due as he had pulled the intake... Trouble codes: 172 (rich condition bank 1), 175 (rich condition bank 2).
1999 Chevrolet Silverado 1500 5.3L water pump VIN: 1GCEK19T6X
well finnal got the truck back in replaced water pump noise seemd to go away thanks for the help
2001 Chevrolet Silverado 3500 6.6L low coolant light when hot, long warm up time VIN: 1GBJK33141
Being an auto guy, I checked for combustion leak on this diesel like I would a gasser. Combustion leak dye test was negative. Used four gas to check for unburned hydrocarbons at the radiator, 26ppm? Ran a pyrometer/temperature test at exhaust runners, all with...
2002 Chevrolet Trailblazer LS 4.2L outside temp VIN: 1GND513S12
thanks to all who responded. after unplugging and plugging the sensor a couple of times. it started working .So i just ordered a new sensor. test drive no more problems..I thank Duane, Ryan and Craig, all had useful stuff
2002 Chevrolet Trailblazer LS 4.2L No Start VIN: 1GNDT13SX2
Well I don't know for sure what fixed it but, when I got back to it. I put the old bcm in while testing because it origonaly programed for the vehicle well any way when hooked up the battery and turned on the key evrything worked. like rebooting the bcm or som... Trouble codes: U1000 (no stat of health from module), U1041 (loss of ebcm communication), 1026 (loss of class 2 from ebcm), 1152 (loss of hvac communication).
2002 GMC Sierra 2500 HD 6.0L front axle VIN: 1GTHK24U72
Hello everyone, there is no easy way to get these axle shafts out, we had to cut flange off split case and drive out from the inside, replace shaft. Thanks to all that replied!
2003 GMC Sierra 3500 SLE 6.6L Hesitation VIN: 1GTJK33133
After reading all of the replies, i kind of took a little from each one. i did not have scan tool ability to command full FRP but i was able to road test while watching the data list and focusing on actual vs. desired FRP. During my drive i could see that unde... Trouble codes: 1093 (fuel rail pressure low during power enrichment).
1995 Oldsmobile Cutlass Ciera 3.1L Surge VIN: 1G3AJ55M6S
Thank you for the help, got them completed. I received some good information from everyone that responded.
1997 Pontiac Grand Am SE 2.4L MIL Lamp on VIN: 1G2NE52T2V
Well, after waiting for replies and reading them, I rescheduled this car to come back so I could disconnect the battery and touch the terminals together as some of you suggested. The day we had the car in the shop, I had another Grand Am the exact year and con... Trouble codes: P1404 (egr pintle position).
1998 Pontiac Sunfire SE 2.2L engine VIN: 1G2JB5241W
Thank You all that replied... Customer dropped vehicle off, and I drove it around to get it hot enough to start overheating... No such luck... Checked for HC in coolant, None found. After letting vehicle sit, water pump seal popped. Replaced water pump. Custom...
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