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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 12, 2005
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Open Help Requests for GM
Help Request Answers
1995 Buick Regal 3.8L MIL Lamp on VIN: 2G4WB12L0S
cust complaint of check eng light, no current codes, vehicle has 16 memory codes, can not clear memory codes, tried replacing ecm and prom, checked powers and grounds all ok , vehicle runs fine, without running eng was able to clear all but 5 codes turn key of...
2000 Buick Century Custom 3.1L MIL Lamp on VIN: 2G4WS52JXY
This Buick is setting this vent code because the tank pressure is reading very strangly on my OTC scanner. I get readings varying from -58000in to - [...]! I haven't had much time to work on this yet but I did pop a new tank pressure sensor, but that made n... Trouble codes: P0446
1990 Chevrolet Lumina 2.5L No Start, Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 2G1WL54R4L
Ok, this 90 Lumina comes in on the hook, wont start, the battery was dead, so we charged it up, and the car starts, get ready to back it out for road test, and it dies, Wont resart. good spark, no injector pulse, check all the wiring, cleaned connections, car ...
1990 Chevrolet Lumina 3.1L No Start VIN: 2G1WL54T6L
This is a really basic system by today's standards, and I've fixed hundreds of these things, but this one has me stumped! Towed is as a no-start. No spark, no inj pulse. very weak crankshaft signal, checked at 3 meg-ohms, so we slam-dunked a new one in. Now th...
1996 Chevrolet S10 4.3L Cuts out, MIL Lamp on VIN: 1GCCS19W41
Vehicle arrived with customer complaint of ABS activates when driving down the road. After road test to duplicate found engine momentarily shuts down,scan tool resets(no codes stored),ABS resets,and fuel pump relay clicks when condition occours. Happens at all...
1996 Chevrolet C1500 Cheyenne 5.7L Hydraulic VIN: 1GCEC19R9T
This vehicle came to us reffered by another repair shop in the area. The complaint was excessive pedal travel. we found the prop valve mounted to the abs unit leaking. customer elected to install a salvage yard nonabs combo valve instead of the factory valve, ...
2000 Chevrolet Blazer LS 4.3L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GNCS18W6Y
Vehicle was brought in for running rough and failed emissions. Upon looking at the vehicle I found that it still had all the original tune-up parts so they all got replaced ie... Plugs, wires, cap and rotor. After futher testing I also found that the Spider In... Trouble codes: P0302, P0304
2000 Chevrolet Monte Carlo SS 3.8L cooling fans
Car has come back with cooling fans always running high speed. engine stays cool all the time. have scanned computer for codes found none. have checked coolant senor for bad readings found ok. checked for high pressure on a/c found ok. alldata states fans shou...
2001 Chevrolet Silverado 1500 5.3L fuel system VIN: 2GTEK19T21
this is the first time i've posted a help request so bear with me! this vehicle started as a dead battery that we towed in. replaced the battery and the cruise light and the headlight high beam light is on with the key on or off. checked codes and found a 1626...
2002 Chevrolet Trailblazer LS 4.2L transfercase VIN: 1GNDT13S32
vehicle came in with complaint of 4wd inoperative and 4wd indicator lights inop. we tried to check system for codes and can not comunicate with the transfercase module so we checked ecm for codes has code u1000 serial data problem. we have checked powers and g...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Chevrolet S10 4.3L High Idle VIN: 1GCDT14Z0K
Thanks to everyone for your help on this one. Allen from North Carolina nailed it right on the head. Driving at speeds over 35 mph to relearn achieved a perfect idle. Thanks again!
1994 Chevrolet S10 LS 4.3L transfer case VIN: 1GCDT19WXR
After a few suggestions about disconnecting the battery for 5 minutes and letting the system reset Its works fine so thanks for all the help on this.
1996 Chevrolet Beretta Z26 3.1L Poor Idle Quality, Misfire VIN: 1G1LW15M5T
The fix for this critter was R&R of the intake manifold gasket as it leaks between the manifold port to the valve cover area so you can't heae it unless you take the valve covers off. Two of the 9 replies thought it was the intake leak. Thanks a lot!
2002 Chevrolet Silverado 2500 HD 8.1L Code P0708 VIN: 1GCHK29G32
Thanks again to all who replied. I replaced the switch with another new updated switch with no luck. Checked all wirieg in and out of the tcm and the nsbs again. Found no problems. Tryed to clear code and it would shut off but come right back on. Borrowed loca...
1991 GMC S15 Jimmy SLE 4.3L front diff. & transfer case VIN: 1GKCT18Z1M
thanks to all who helped theres a spring clip that holds the cable to the front shift fork under the switch housing spring was bent and allowing cable to slide through replaced clip working properly thanks again
1991 GMC TopKick 8.0L A/C Controller Module VIN: 1GDM71HJ1M
Havn't seen this truck back yet, I got 7 replies on everything from cleaning the contacts on the circuit board in the controller to checking the 2 relays for both the blower motors. Hopefully I will get it back on a slow week here after christmas. When I do I ...
1995 GMC Jimmy 4.3L Cuts out VIN: 1GKCS13W5S
thanks everyone- still haven't found problem, think i have a bad wire to ecm? chuck [...]
2000 GMC C-Series Topkick C7H042 7.4L Cuts out, Stall VIN: 1GDJ7H1B1Y
thank you all for your input. what we finally noticed was that the blue wire to the left side tank was getting hot. so we replaced the fuel pump and went about 30 miles with no stalling. the pump must have been getting hot when switched on and there for shutti...
2004 Pontiac Grand Prix GT2 3.8L power steering pump whine VIN: 2G2WS542X4
had to flush steering system again with gm power steering fluid. this was after about a month of driving after which the pump had quited down somewhat but still was not perfect.after flushing again the noise seemed somewhat acceptable although i would not say ...
1995 Saturn SW1 1.9L cooling fan VIN: 1G8ZH8284S
Thanks for all of the responses. The Saturn techs were right on. The cooling fan doesn't come on till temp reches 226. After that it runs for 5 minutes, regardless of temperature of engine. Big clue was when it cooled down to 160. Tstat should close and not al...
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