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Prev Professional Automotive Repair Technical Discussions for August 6, 2007
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Open Help Requests for GM
Help Request Answers
2002 Buick Rendezvous CX 3.4L Poor Idle Quality VIN: 3G5DA03EX2
we have a 02 rendezvous the fan relays will start clicking and shortly there after the idle will surge up then the relays will stop clicking and the idle will return to normal unplug one of the cooling fan relays idle returns to normal. checked ground circut f...
2002 Cadillac DeVille DHS 4.6L Accessories VIN: 1G6KE57Y72
when stopping vehicle, gas guage drops to empty and then returns to normal. radio will turn off. security light will illuminate.
1984 Chevrolet Corvette 5.7L transmission VIN: 1G1AY0780E
ok this one got me car goes good forward ,but reverse it dont want to go,it acts like its slipping, tried to adjust linkage but seems ok,sorry guys i dont know much about this transmission ,seems like nobody around me does .it will move slowly but you give it...
1996 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY2253T
This '96 Corvette has had 4 bank 1, sensor 1 oxygen sensors in the past 2-3 years. The last three sensors have been ACDelco sensors. (The first two sensors were replaced at another shop, and the last two were here.) Every few months the CEL will come on for co... Trouble codes: P0131 (bank 1 sensor 1 o2 sensor performance)
1999 Chevrolet Blazer 4.3L differential/transfer case VIN: 1GNCT18W9X
Vehicle came in with loud clicking (rattle/clanking/clunking) noise from front left side of vehicle. Only occurs in 2WD when accelerating HARD(accelerate normally - no noise), (sounds like clank, clank, clank, clank, clank ... until you let off on gas pedal) p...
2001 Chevrolet Cavalier 2.2L Starting VIN: 1G1JC12F43
These vehicles are know for their bad fuel pumps. This one is new and working. I ran a hotwire to it and its fine with big time pressure. It's got fire from the fuse box to the pump but not getting thing from the PCM to the fuse box. I checked all the fuses I ...
2001 Chevrolet Venture LS 3.4L starter VIN: 1GNDX03E51
The starter was shot so I replaced that no signal from the purple wire at the starter. I can ground the black/yellow wire at terminal 76 at the pcm it cranks and starts but then dies after about 2 seconds. the battery was disconnected.
2001 Chevrolet Tahoe 5.3L MIL Lamp on VIN: 1GNEC13T71
recheck everything seen to work good, turn on air pump, it run normal. might there be a problem with the switch air valve solenoid.? may i have some advice from chevy tech. thanks in advance, thoa Trouble codes: P0410
2004 Chevrolet Silverado 3500 LS 6.6L Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 1GBJC34214
what i am asking for i think maybe the injector driver is bad these are the cylinders that arent firing #1#7#4#6 i need a wiring diagram for a 2004 with a engine code 2 instead of the 1 that we have could you fax it to me at 1-[...] has anyone ran into ... Trouble codes: P0207
1992 GMC C3500 Sierra 5.7L rear brakes VIN: 1GDTK74KSN
brakes are extremely sensitive ti the point where it seems like the rear are locking up before the front installed new hydroboost no fix.not real familiar with boost but suspect maybe not related to concern.any idease why the rears would lock and not the front...
2003 GMC Sierra 1500 SLE 4.3L MIL Lamp on VIN: 1GTEC14X93
Recently we replace the intake gasket, did an fuel inj service, the Ck Engine has been coming on with a code P0430, but the truck runs good etc, the customer is concerned about the light. Bank 1, oxygen sensor 2 seems to be slow to responding, but the code ref... Trouble codes: P0430 (Catalytic iIneffiency Bank 2)
1994 Oldsmobile 88 Royale LS 3.8L Generator VIN: 1G3HY52L4R
The tests all still indecate to me that another alt is needed but this is #2 alt doing the same sympton.So useing the wiring diagram I followed the "L" terminaland it always has 2VOLTS less than battery voltage. The fuse,B1 terminal of the PCM all have battery...
2003 Oldsmobile Alero GL 3.4L Drivers power window VIN: 1G3NL12E53
This car has a problem with the power window on the drivers side the customer complains that sometimes while driving it will go down on its own. He said he can then roll it back up but every once in a while it will roll back down again. Someone else replaced t...
1999 Pontiac Grand Prix SE 3.8L Electronic VIN: 1G2WP5K1XF
Car came in last week with P0742(TCC stuck on). Test drove and TCC was indeed stuck. Removed side cover and replaced TCC solenoid. Test drove. All was well. Two days later the lady called up and said the check engine light was on. Now P0751(1-2 shift solenoid ...
2002 Pontiac Firebird Formula 5.7L Poor Idle Quality, Hesitation, Surge, Stall, MIL Lamp on VIN: 2G2FV22GX2
The owner states warm to hot conditions, engine has hessitated, almost stalled. ses came on, accelerating from a stop. There have been 3 times in the last month. There were no prior running problems befor the high performance parts were installed. They say the... Trouble codes: P0106 (Map or baro out of range), P0134 (Oxygen sensor Bank 1 Sensor 1 slow operation)

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Regal LS 3.8L no start at times,air bag light on,abs light on VIN: 2G4WB52K9X
First off thanks for the help. It is fixed and it was the ignition switch. the pink wire that powers the brk lock switch and the fuse box air bag ,cluster,bcm was so intermitant and it had power but at times it only had 5.65 volts ,anyway all is good...
2003 Buick Rendezvous CX 3.4L MIL Lamp on, ALL WARNING LIGHTS VIN: 3G5DB03E53
thanks to all that replied. this vehicle has not returned for futhur testing, but when i finally get to fix it, i will post. Trouble codes: P1626 (theft deterent fuel enable signal lost), U1096 (lost comm. with ipc), U1300 (class 2 data link low...shorted to gnd).
1991 Cadillac Seville 4.9L Cuts out, Stall VIN: 1G6KS53B8M
1995 Chevrolet Lumina APV 3.8L Closing VIN: 1GNDU06L5S
Hello all, Never did find out what the cause was. Customer declined further repairs. Did remove and inspect the latch and switch, turns out the service manual is wrong, all the the switch does is indicate when the handle is being pulled, it does not toggle...
1997 Chevrolet Cavalier LS 2.4L Hesitation, Stall, MIL Lamp on VIN: 4G1JF32TXV
Thank you all for the help after a little further inspection due a reply on here I found the vacuum line to the MAP sensor deteriorated after replacing the line and driving I found this to fix the problem.
1999 Chevrolet Astro 4.3L Hesitation, Surge, Cuts out, Stall VIN: 1GBDM19W4X
This Astro is still not fixed. I have changed the MAF sensor, cam sensor and found a bad fuel pressure regulator. Fuel trim numbers remain the same. The cam retard is now -15 degrees. Cam and crank signals look good when van dies out. The new fuel pump fa...
2000 Chevrolet Suburban 2500 LT 6.0L Rear differential VIN: 3GNGK26U9Y
After checking the rear differential, transfer case, front differential and the transmission the solution seams to have been the GM teflon lube on the slip yoke. GM wanted $600.00 for a new slip yoke and drive shaft so I took the old one to Driveline Services ...
2000 Chevrolet Malibu 3.1L A/C Control Unit VIN: 1G1ND52JOY
Thanks to everyone for their replies. I did suspect a bad control head, however I was hoping for some conclusive tests. Thanks for your suggestions and I have installed the new unit and so far, there has been no further problems. Thans to all you guys. I a...
2003 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC12F43
There was 2 problems here. The fuel pump was bad and also the PCM was toasted. The customer had an extended warranty on the car that covered the fuel pump. GM as an 8 yr 80,000 mile warranty on the pcm's (I never knew that)so I had to tow to the dealer for the...
2003 Chevrolet Express 3500 6.0L Electronic VIN: 1GBHG31U63
As it turns out the PCM wasn't getting a low pressure signal either (the high side was also missing). I figured this out by backprobing at the ECM. When I gave power to the high side and grounded the low side the compressor turned on. At that point I began the...
1999 Pontiac Grand Am SE 3.4L passlock VIN: 1G2NE12E8X
Thanks everyone for your help. I unhooked the remote start and the car has worked fine since.
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