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Prev Professional Automotive Repair Technical Discussions for February 18, 2009
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Open Help Requests for GM
Help Request Answers
2003 Cadillac DeVille 4.6L Accessories VIN: 1G6KD54YX3
To all; Here we are with a seat problem again. This time this caddy has a couple of problems. First Ia looking for testing information on the passenger seat heater. The switch seems to work and I tried the passenger heater control module on the driver seat and...
1990 Chevrolet Corsica LT 3.1L No start VIN: 1G1LT51T5L
Vehicle was towed in with a no start. Crank, spark and fuel all present. Fuel pressure good and injectors have pulse. Used scanner and all sensors are in range. Tested ecm (twice), can make flash code 12 and turn on fan and all tests within spec. Tested inject...
1991 Chevrolet V3500 Silverado 6.2L transmission VIN: 1GCHV33N3M
Hi guys and girls.I have had some shifting problems during this winter and it seems to have settled into a rythem I can explain.This 4l80e most of the time starts off in 2nd gear and will not upshift past 3rd until it has been running for about 5 min.Then it s...
1995 Chevrolet S10 LS 4.3L Heater VIN: 1GCDT19Z8S
Thanks for reading this I hope someone has the answer. I live in a cold wintery climate & a defroster is a must. The problem is intermittantly the air flow out of the heater ducts is low & sometimes there is a hot smell associated with it.The heater mode cont...
2003 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEK19T03
hey guys have this 03 silverado mass air flow code p0101 keeps coming up and now p0420 cat eff code. i replaced intake gaskets full tune i drove this vechicle 80 miles than light came back on same codes i also replace fuel pump and all o2 sensors i really do n... Trouble codes: P0101 (p0420-), P0420
2002 GMC Sierra 1500 SL 5.3L MIL Lamp on VIN: 2GTEC19T22
This car came in with a MIL and P0300. The owner said the truck ran fine and had no drivability complaints. A few occasional misfires show up at idle, but not biased toward one cylinder. After looking on the ignition scope, the firing kV was about 10-13V, spar... Trouble codes: P0300 (testing and results)
1995 Oldsmobile Aurora 4.0L Excessive Emissions, Surge, Cuts out VIN: 1G3GR62C4S
This car will drive perfect for a couple of days, then get a buck or quick stall, but not die, CE light comes on and sets the p0023 code. The PCM then takes voltage off the bypass. Alldata is not very good on this one. does anyone have any experience in this a... Trouble codes: P0023 (Ignition control)
2004 Oldsmobile Alero GL 2.2L valvetrain VIN: 1G3NL52F44
Thank you all in advance for your help. This car was brought to us with a complaint of a rattling noise. I verified the noise with the customer. He stated he had the oil changed 1 week ago, and shortly after, the noise started. The oil is full, he hasn't had t...
2004 Oldsmobile Alero GL 2.2L water pump VIN: 1G3NL52FX4
replaced water pump with after market pump asc brand new not re-man. after installation we heard noise. used stethescope and heard whining noise @ rear of pump. sent new pump back and installed another new pump, noise is still there. has anyone experience this...
1997 Pontiac Grand Am SE 2.4L Misfire VIN: 1G2NE52T9V
The car over heated and the customer had the head gaskets replaced. the car has had a miss at idle since then, but runs great off idle.The miss is bad on #3 but 2-4 will misfire to but not set codes. I did a compression check and all 4 are 80.I swapped the plu... Trouble codes: P0303
1998 Pontiac Grand Am SE 2.4L Cuts out, Misfire VIN: 1G2NE52T2W
This car will start to surge or miss starting at 1900 to 2000 RPM. It will surge down to 1600 RPM and then back up to 2000 RPM. Above and below this RPM, this does not happen. The problem will happen in park, or in any gear. No codes in ECM. I do not want to t...
2001 Pontiac Montana 3.4L window defrost VIN: 1GMDX03E11
thanks you in advance for all your help. This Montana van came in with the complaint of the windows fogging up. Found low engine temp and replaced bad t-stat. Engine temp is good now but still have window problem. Verified that the blend door's are working and...
2001 Pontiac Aztek 3.4L Poor Idle Quality, Surge VIN: 3G7DA03EX1
finished with the head gaskets and the car ran fine customer picked it up and said by the time she got home the car was surging when coming to a stop. brought back in and the check engine light was on the code was P0341 cam sensor out of range. scoped the cam ... Trouble codes: P0341, P1336 (crank relearn)
2003 Saturn Ion-3 2.2L Hydraulics VIN: 1G8AK52F43
Cannot get into any gear while engine is running. Clutch pedal feels soft, feels like there's no pressure being built until halfway depressed. Engine off, put into gear & start engine - vehicle wants to creep along so I know the clutch is not being completely ...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick Century Custom 2.5L No Start VIN: 1G4AH51R8J
I looked back at the crank sensor again. Ohmed it out and checked the pin fit ohm fine but seemed loose. We replaced it and it finally fired and ran fine. thanks all.
2001 Buick Regal LS 3.8L cv installl VIN: 2G4WB55K31
I got beat up on this one! i ordered a reman shat from one of the biggest supplyers in the midwest, they sent the new chinese shaft which trhey just started selling. car is piece of shi going to auction it had broken cv. used is $35 new chinese $42. fit & fini...
2003 Cadillac DeVille 4.6L 2ndary air pump VIN: 1G6KD54Y73
Thanks to everyone help, I found the 2nday air system vac solnoid was frozen,it wasnt allowing vac to the rear air valve. Bad part is they only sell it with the rear air valve which is over $350. I was able to find one at the junk yard and has worked fine fo... Trouble codes: 0410 (2ndary air pump).
2003 Cadillac CTS 3.2L ?? VIN: 1G6DM57N03
Sorry it took so long to close this one.. I wanted to make sure it was fixed. We ended up changing the oil with a full syn. oil. After driving a few miles down the road the noise went away and hasn't came back yet!! thanks to eveyone that helped!
1993 Chevrolet K1500 Cheyenne 5.7L Excessive Emissions, Poor Fuel Economy
Very big thanks to all who offered assistance.As I mentioned in the help post I did try another throttle body this morning and wouldn't you know its almost perfect.I think between the bad wires and plugs,the ecm and the wrong prom and a defective throttle body... Trouble codes: 043 (knock sensor).
2002 Chevrolet Tahoe LS 5.3L Poor Fuel Economy, MIL Lamp on VIN: 1GNEK13Z82
Ran flow chart for code and suspect ecm failure. Has 9.6v. on ref line from computer and it should be 4.2-5.3v. Customer has decided not to continue with repairs. Thanks for your time and information. Trouble codes: P0178 (fuel composistion sensor).
2002 Chevrolet Impala LS 3.8L Mechanical VIN: 2G1WH55K22
2005 Chevrolet Suburban 1500 LS 5.3L ride control VIN: 1GNFK16Z65
Thanks to all who replied. The problem was the Modis, needed a TechII had code for left rear solenoid.Chevy said to replace rear shocks as a pair. Customer declined repairs.
2006 Chevrolet Silverado 2500 HD LT 6.0L 1-2 shift VIN: 1GCHC24U76
Thanks for the quick and concise help , sorry I didnt have more specific info in my help request.Informed techs were able to steer me towards bulletin 01-07-30-030B and as my crusty old eyes opened I then realized I had the 4L80E trans. that apparently is not ...
1998 Oldsmobile Silhouette Premiere 3.4L abs/tcs VIN: 1GHDX03E8W
Thank you to all that replied. I took your advice and removed the rear tailight assemblies and found that the boards where the bulbs plug in were cooked replaced both left and right assemblies and the van is now back on the road with no mil or abs/tcs lights....
2000 Pontiac Montana 3.4L cooling system VIN: 1GMDX03E5Y
after informing customer of issues of oil in cooling system(yes engine oil) and the small coolant leak on back side of intake she wanted me to do the intake gaskets and flush cooling system. I found that the last tech had used a cheap brand of gaskets and yes ...
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