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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 9, 2005
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Open Help Requests for GM
Help Request Answers
1987 Buick Century Limited 2.5L No Start VIN: 1G4AL51R3H
problem child here. im getting no signal from ecm to fuel injector, i can pulse injector to make work, i am receiving pulse signal from icm. the bandwidth seems a little wide compared to snap on vantage example. replaced icm and crank sensor, still no luck and...
2000 Buick Regal LS 3.8L HVAC Display VIN: 2G4WB52K2Y
This vehicle has a HVAC(dual zone) digital display that is not operating. All of the other functions operate and illuminate properly on the control head. What I am looking for is the information and parts to repair the display instead of replacing them all the...
1996 Cadillac Fleetwood 5.7L MIL Lamp on VIN: 1G6DW52PXT
Hello again! I did'nt think I would be asking for help so soon. I have this 1996 Fleetwood that has a code po441. I ran the trouble tree on it and the purge solenoid failed. I replaced the solenoid and test drove the vehicle. I could see that it was flowing o... Trouble codes: P0441
1998 Cadillac DeVille 4.6L compressor VIN: 1G6KD54Y3W
vehicle entered our shop with no a/c found evap. to be leaking recharged system before replacing to verify everything is ok and everything worked perfect. about 12 hours later when evap. was replaced i got a message on dash that there is no pcm data and theft ...
1999 Chevrolet Tracker 2.0L Compressor VIN: 2CNBJ13C2X
Hoping someone out there can figure out what Im missing here. This Tracker came in with the compressor locked up. Unbelievable what these things cost, over 900.00 and I could only get one from the dealer. At that expense I was scared not to replace everything....
2000 Chevrolet Silverado 1500 5.3L Drive belt VIN: 1GTEC19T5Y
A/C belt missing, no damage to main drive belt.
2001 Chevrolet Tahoe 5.3L Charging VIN: 1GNEK13T51
Customer came in a couple of weeks ago with a weak battery. Charged and tested battery, OK. But we found Alternator ripple too high. Replaced alternator. Customer then complained that the "Battery" telltale comes on intermittently. We checked it out and could ...
2002 Chevrolet S10 LS 4.3L instrument cluster VIN: 1GCDT13W42
vechicle come in for battery light on ,alt. gauge shows charging test alt ok check voltage and grounds to cluster check engine light on found multiple codes at first cleared codes and code u1255 and u1301 come up again fuel gauge,low fuel light on check engine...
2004 Chevrolet Silverado 2500 LS 6.0L headlights VIN: 1GCGK23U34
Totally lost...have spent 4 hours testing. Looks like headlights stay on with truck off. Replaced body module and had dealer flash. No difgferent. If you remove relay "HDLP-HI" lights go out. Truck has automatic headlights on system. Noticed headlight sensor i...
1997 GMC Yukon SL 5.7L Steering VIN: 3GKEK18R3V
Group, Getting tired of driving my Yukon with the erratic steering (again) I once again broke down and ordered another EVO sensor from the local dealer after finding out that Dormans version is on forever backorder. I usually have to replace the steering sens...
1997 Oldsmobile Cutlass Supreme SL 3.1L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3WH52M4V
This GM is driving me crazy.Car came in with misfire about six weeks ago. Replaced number 3and number 2 injectors leaking. We replaced with napa injectors. Came back week later both leaking again. Again replaced with napa. Back in three days later leaking. Che... Trouble codes: P0300
1999 Oldsmobile Silhouette Premiere 3.4L engine VIN: 1GHDX03E3X
Hi everyone , I have a 99 olds silhouette with a 3.4L car came in with the check engine light on & flashing did a scan and found code PO300 current in memory check missfire counters and # 2 cyl is not running tried the basics first new plug & wire , no help so...
2001 Oldsmobile Intrigue GX 3.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3WH52H81
This is been a fun one. Car came in with SES light on PO172. Long term fuel trim stays near -16. I have tested all of the injectors for flow and leak down. Flow is almost exactly the same on all 6. No pressure leakdown at all. Pressre regulator is not leaking.... Trouble codes: P0172 (fuel trim rich)
1989 Pontiac Grand Prix 2.8L speedo/odometer VIN: 1G2WJ14WOK
Hello all, I have a Grand Prix I need some advice on. The vehicle is equipped with a digital speedometer/odometer. Intermittently, the speedo will read 0 mph and the odometer will begin flashing unreadble numbers. This all occurs while driving down the road. I...
2004 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB12FX4
04 sunfire 2.2 ecotech cold or sits for a while it will not start on its own,it will start with carb spray however it has 5o-60 psi all injectors pulsing. when cranking pulse width increasing to 18-19 ms.i did a volumn test and in 20 second will fill a 20 oz b...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Century Custom 3.1L MIL Lamp on VIN: 2G4WS52J31
well this one is fixed . while scanning data found data fluctuating then lost 5 volt signal . checked wiring back at pcm and as i was testing 5 volts came back . found wiring chaffed at ac accumulator/drier . fixed wiring and all is well . thanks to all who re... Trouble codes: P00, 452 (fuel tank pressure sensor circuit low voltage), P00, 462 (fuel level sensor circuit low voltage).
1992 Chevrolet C1500 Cheyenne 5.7L Compressor VIN: 2GCEC19K2N
Thanks for all those that replied. It turns out faulty equipment was the problem. The scale on my brand new machine was malfunctioning. I never would have found it unless i put a extra 1lb in and tried it. Problem solved
1993 Chevrolet C1500 Cheyenne 5.7L Hesitation, Misfire VIN: 2GCEC19K9P
Gentlemen, many thanks for the 20 replies.I was amazed with the amount of help supplied. The general consensus was fuel pressure & flow, ignition faults & timing & maybe injectors. We checked for codes & only code 12 was found. We then checked fuel pressure & ...
1997 Chevrolet Lumina 3.1L Hesitation VIN: 2G1WL52M4V
It has been over a week and the bogging lumina has not returned so I am going to call a partially plugged catalytic converter the culprit.All the replies were checked into and considered.My sincere thanks to all who took time to reply and especially to Robert ...
1998 Chevrolet Blazer 4.3L pass lock security system VIN: 1GNDT13W8W
Thanks to all that replied.Special thanks to Jeff from Kentucky,You hit the nail right on the head.It took a new ign key lock cyl. and lock cyl housing from the dealer to fix this one.IATN is Great !!! Thanks Again, MIKE
2001 Chevrolet Monte Carlo LS 3.4L all VIN: 2G1WW12EX1
well its about two weeks put system in a vacuum for about7 too 8 hours. held about 26' of vacuum. charger with nitrogen too 200pis. for about 12 hours it held. recharge system a/c works just find not sure if a valve was leaking or someone remove the freon. ps ...
2002 Chevrolet Trailblazer LS 4.2L converter clutch VIN: 1GNDT13SX2
well it is fixed. slip speed is under 60 rpm and duty cycle stays aroun 40-60%. the svc mgr and gm decided to stop the bleeding and replace the unit with a SRTA. did that and all is well now. amazing how fast you can r+r that puppy on the 3rd time! after much ...
1994 GMC Jimmy SLE 4.3L drive VIN: 1GKDT13W5R
I replaced the output sensor on the trans , and everything was fine. I thought the speedo sensor was the only output sensor, but it had another one . thanks for all the help
2003 GMC Sierra 1500 SLE 4.3L No Start VIN: 2GTEC19X03
Hi all. Sorry for the late response, but i wanted to give the repair a chance to fail again or not. Customer did not want to replace the sensor assembly due to cost since he would like to trade anyway, so we replaced only the ignition tumbler with the magnets ... Trouble codes: P1626 (Loss of communication with VTD).
1999 Oldsmobile Intrigue GL 3.5L blower motor VIN: H5XF371246
Hey guys, Looks like we have a good fix on this one. I'd like to thank everyone who took the time to reply, especially Dale from N.C. After double checking everything two and three times I was pretty convinced we had a bad blower motor module, even though it w...
1994 Pontiac Trans Sport 3.8L MIL Lamp on VIN: 1GMDU06L9P
I want to thank everyone for their promt responses. I finally got this thing to act up when it was in the shop and I had the labscope part of the modis on it. I was monitoring the 12 volts to the MAF and the 5 volt square wave from MAF. The modis was recording... Trouble codes: 101 (Mass airflow failure).
1995 Pontiac Grand Am GT 3.1L No Start VIN: 1G2NW55M3S
We found a bad connection by starter. This may or may not have fixed it but it has started ever since. It was a hot wire that could have gone to ecm. We still have a problem with a rough idle and stall after a cold start. There are 2 flashes for this symptom b...
2000 Pontiac Grand Prix GTP 3.8L shifter VIN: 1G2WR5211Y
Well guys finally have this one fixed. I found a bad ground at the park/neutral position switch located on the top of the transmission. I kinda stumbled across this one. I was leaning in the direction of possibly having a bad park/neutral switch so I borrowed ...
2000 Pontiac Grand Am SE 2.4L Daytime running lights VIN: 1G2NF52T8Y
This car is fixed, finaly. Gerry got me the closest on this one, while i was fiddleing with the wires on the bottom of the relay center the horn was sounding so i was suspecting the box then but after i got a wiring diagram for that box faxed to me from the ca...
2001 Pontiac Grand Am SE 2.4L steering box VIN: 1G2NF12T71
Customer elected to wait and see if it gets worse. But do want to thank all for very usefull info/we did lube the intermediate shaft and customer related 2 days ago that it seemed better.. he also told me he had an aftermarket rf wheel bearing installed..some ...
1999 Saturn SL2 1.9L dies, inside fuse block problem?? VIN: 1G8ZK5276X
in summary almost all of the 13 replies leaned toward the i/p fuse block in the center console. many thanks to all who replied. went in through the driver's side of console, moved harness to gain access to fuse block , as so many stated i removed the bulkhead ...
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