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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 1, 2007
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1998 Cadillac Seville SLS 4.6L hvac control and blend door VIN: 1G6KS54Y1W
This car is a real problem child today. This Caddy came in with a dual zone climate control issue. It would blow hot air on the driver and ice cold on the passenger. Local Cadillac dealer said they had replaced numerous "mode door actuators" in other Seville/D...
1992 Chevrolet K3500 Cheyenne 7.4L Poor Idle Quality, Misfire VIN: 2GCHK39NXN
When I got the heads reinstalled and started vehicle. Everything checks out ok, except at idle there seems to be a misfire. Performed cylinder balance test and found #8 cylinder to not change the rpm. Checked compression 125 psi all others around 150 psi. Appl...
1996 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC1249T
good day all this car came in no start, would run 5 min then stumble and stall. restart after 10 min then repeat. found pcm coil drivers shutting down. replaced pcm, car ran perfect for 2 hours. went to deliver and no start. no spark until you let off the key....
2001 Chevrolet Express 2500 5.7L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GCGG25R11
Hello fellow techs... This one is a real nightmare... Problem is intermittent and goes into hiding sometimes for a few thousand miles. The vehicle will start bucking while accelerating SLIGHTLY. Also the CHECK ENGINE light will flash but not like a misfire fla... Trouble codes: P0706 (Transmission range sensor ckt), P0335 (Crankshaft position sensor ckt)
2000 GMC Jimmy Envoy 4.3L ignition key VIN: IGKDT13W3Y
This vehicle has a difficult time removing the ignition key.If you jerk the shifter back and forth the key will eventually allow you to turn it back to the off position thus releasing the key making removal possible.This started out as a seldom ocurance but ha...
1997 Pontiac Sunfire SE 2.2L Misfire VIN: 1G2JB524XV
Vehicle came in with a complaint of a leaking fuel injector which was confirmed. After the replacement it returned with a misfire code for #4 cylinder not #2 injector that was replaced. After replacing plugs and wires due to miles now there is a misfire on #13...
1998 Pontiac Sunfire SE 2.2L Surge, Misfire, MIL Lamp on VIN: 1G2JB5241W
If anyone has seen repair or screen kit I would be greatful Thanks Darren Trouble codes: P0404 (E.G.R pintle pos. open)
2000 Pontiac Grand Prix SE 3.8L Stall VIN: 1G2WR521YF
this car was towed in last week stalled no start .i hopped in it turned the key started right up pulled out stalled.tried it again 3 times it stalled the 4th time it ran and stayed running for 3 days i changed fuel filter and left him have it. towed in today s...
2001 Pontiac Sunfire SE 2.2L Poor Idle Quality VIN: 3G2JB12441
Desired Idle always at 600rpm. IAC is hovering around 600rpm and the whole car is shaking. At 700rpm (using Scantool), the car is idle smooth. There are no codes at all using Enhanced Data Scan, and there are no drivability issues, just the low idle and the d...
2002 Saturn L200 2.2L MIL Lamp on VIN: 1G8JU54F32
I checked all powers and grounds to BCM.Symtoms are as follows,dome lites flash and flicker,headlamps flash and flicker,instrument cluster guages work then don't work,security light flickers not flashes,shift lock will not release,tailights flickering,front ru... Trouble codes: U1064 (bcm data line lost)

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Rendezvous CX 3.4L compressor VIN: 3G5DB03E32
I put a new bcm in it and reprogammed it. The a/c works great. I'm not sure exactlly why the bcm wouldn't let the pcm ground the relay but it is fixed and on the road.I was lucky that the customer was very patient but he understood because he works as an engin...
1994 Chevrolet K1500 6.5L MIL Lamp on VIN: 2GCEK19S3R
Another one fixed with help from IATN members - had to go into legacy software in the MODIS and then the coolant readings were where they were supposed to be. As far as the baro pressure problem, a used computer fixed the code 33. Thanks again for the help Trouble codes: 33 (EGR Control Pressure/Baro Sensor Circuit High Low Vacuum).
2000 Chevrolet Impala 3.8L no 3rd VIN: 2G1WF55K49
finally fixed it, fisrts of all i want to thank you techs who helped me with this one. the genisis is wrong when you look at lever possition data, do not trust it, i used my snap on and found out i was chasing a gost, after i replaced 3 lever positon sensors. ...
2001 Oldsmobile Alero GL 2.4L engine VIN: 1G3NL52T71
We removed oil pan and balancer assembly and found a bad rod bearing on #4 cyl. Waiting on warrantee company to decide course of repair. Seems this engine has some unique internal noise characteristics. Sounded very much like a valve train noise.
2001 Pontiac Grand Prix GTP 3.8L MIL Lamp on VIN: 1G2WR52151
Thanks for the 11 replies. Most referred to problems with the software that required a 'reflash' to install a later version that would solve the problem. I informed the customer and have not heard back from him. Trouble codes: P1404.
2001 Pontiac Sunfire SE 2.2L clutch engagement VIN: 1G2JB52421
I was unable to pin point the cause of this problem, A/C inop. After fixing the open in the Class 2 data between PCM BCM and not knowing if .5v to 2.5v was good or even what to see on that circuit, I had to guess. So I replaced the BCM and PCM.I felt sure the ...
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