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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 30, 2007
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Open Help Requests for GM
Help Request Answers
1998 Buick LeSabre Limited 3.8L Misfire VIN: 1G4HR52K9W
I guys,I have buick Lesabre,It has a misfire at an Idle on #1 cylider,It is not solid miss,but it does miss bad to the point of setting the p0300.I did check for an Intake leak by pulling T-body off,I did not see any coolant in the intake.Also I did preform an... Trouble codes: P0300 (testing and results)
2000 Buick Park Avenue Ultra 3.8L oil pressure VIN: 1G4CU5414Y
Hi all, I'm hoping somone can help me out here. This car came to us with a light tapping noise at top of engine(noisey lifters). Several collapsed lifters found and replaced. We have a spec. for oil press. for this car of 60 psi at 1850 rpm. We are lucky if we...
2002 Buick Century Custom 3.1L abs motor VIN: 2G4WS52J12
i just started working on this vehical today.when your driving down the road the abs motor will start to run then shut off,sometimes it does it when you hit the brakes and sometimes you can just be driving down the road without your foot on the brake.it had a ...
1991 Chevrolet C1500 Cheyenne 5.0L Pedal Feel, Breaking VIN: 1GCDC14H0M
Front pads are fat and rear shoes have been adjusted out. I have bled this truck several times using gravity, vacuum, 2-man and with a phoenix injector - no luck. Emergency stopping is impossible; the harder you hit the pedal, the higher the resistance to peda...
1997 Chevrolet Blazer 4.3L air bag VIN: 1GNDT13W0V
i've got this 1997 chevy T blazer that has a air bag trouble code b1042 loop energy reserve voltage low(sir 42 current )alldata trouble tree lead me to replace the arming sensor under the driver's seat area (next to fuel filter area )cleared code's still have ...
1997 Chevrolet C1500 Suburban 5.7L Excessive Emissions, Poor Idle Quality, Cuts out, Misfire, Poor Fuel Economy VIN: 1GNFK16ROV
thanks in advance to a great bunch of guys. this vehicle came in with misfires on 3 cylinders,we changed the cap, rotor, wires , plugs, and fuel filter. no change, it burns so rich it will burn your eyes. we pulled the intake and found the pressure regulator l...
1998 Chevrolet S10 2.2L ign. loc cyl VIN: 1GCCS1448W
Loc cylinder an housing
1999 Chevrolet C1500 LS 5.7L No Start, Security Light On VIN: 1GBEC19ROX
As Mentioned before, another repair shop installed a used engine in this truck and did not hook any of the harness grounds up. The interior dash harness had shoted out and melted the plug and wires on headlight switch down to the fuse block. The truck came to ... Trouble codes: P1631
2004 Chevrolet Silverado 2500 LS 6.0L No Start VIN: 1GCGK23U54
I have an 04 Silverado that starts for about 3-4 seconds then stalls.I have checked fuel pressure 58 psi.Map and coolant sensor readings are normal.The vehicle theft detterent system light does not flash with key on.Thelight comes on for approx 5 seconds and g...
1993 GMC C1500 Sierra SLE 5.7L Poor Idle Quality, Surge, Stall VIN: 2GTEC19K9P
hey guys this truck is loading up at cold starts and after warm up it seems to run a little better but not much,i have been over this thing several times but i cant seem to find anything,it will run fine for a minute than back to where it was running,any help ...
2002 GMC Sierra 2500 SL 6.0L Transfer case shift VIN: 1GTGK29U72
The 4WD shifting works on this truck and there is no "Service 4WD" light or any ATC codes. The problem is the transfer case will not go into neutral and when anything besides 2HI is selected that lamp button will flash. 4AUTO, 4HI, and 4LO all flash but they w...
1998 Pontiac Grand Am SE 3.1L gauges, instruments, climate controls, radio VIN: 1G2NE52T4M
Hey Guys, My customer brought his '98 Grand Am for a high speed blower complaint. We found a blown fuse and used an oscilliscope to map a high amp spike when changing blower speeds as high as 55 amps. We replaced blower w/ a Delco unit, installed a new relay ...
1999 Pontiac Grand Am SE 2.4L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1G2NE52T2X
this car has a stumble and misfire on #1 under heavy accel. we have scoped all the injectors they all look good, moved #1 and #4 and our misfire stays on #1 it seems like an ignition misfire. could a bad injector driver cause this bad of a miss? voltage drop b... Trouble codes: P1171

Fixes & Summaries for GM
Fix/Summary Answers
1977 Chevrolet G10 Sportvan 5.7L Mechanical VIN: CGL2574148
I think it's a 3/4 ton, about half of those who helped me said it was as to the 2 in the vin as oposed to the 1 I am thinking is a 1/2 ton. Thanks all of you who took time to see.
1988 Chevrolet K2500 Cheyenne 5.0L Cuts out VIN: 2GCFK24H7J
Once again,thanks to all! I received some great ideas and reminders ,such as the ECM ground at the thermostat housing,possible ESC control malfunction, balancer problems(timing) as well as most who agreed on the common distributor magnet problem. What through ... Trouble codes: 42 (est).
1999 Chevrolet Tahoe 5.7L turn signals VIN: 1GNEK3R1XJ
thanks for the help guys, the problem was in the trailor harness, the guy had installed it himself and it was a real butcher job thanks agian
2001 Chevrolet Tahoe 5.3L service 4wd light VIN: 1GNEK13T91
Replaced mode control switch as many suggested and that seems to have fixed it. Thanks for everyones help. Ken
2000 GMC SCHOOL BUS 7.2L starter VIN: 1GDG7T1COY
Thanks to all who responded to my request on the 2000 GMC school bus chassis. The problem ended up being the orange/black wire from the PCM to the neutral safety switch. It is draped over the bell housing under the trasmission tunnel cover and it rubbed throug...
2003 GMC Savana 3500 6.0L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GDJG31U73
replaced pcm on one of those educated guesses and woila. way to go you guys are the best. i still dont know what was bad in pcm but who cares when customer is happy. thanks again you guys Trouble codes: P, 0507 (idle speed too high), P0300.
2001 Saturn SL1 1.9L Surge VIN: 1G8ZH52831
A replacment ECM Repaired this vehicle She has driven it 6 times on the route it normally failed - NO problems She even Paid us for the used ECM... Now all you Delco TEch Centers listen up If you have the Vetronix - bosch TSS Reflash System with a Tech 2 you c... Trouble codes: 172 (Rich).
2002 Saturn Vue 3.0L Fail Safe Mode VIN: 3GZCZ63B92
The TCM was the fix, but I have no explanation of why it failed. This was a Current Hard Code (P0963) the TCM was in Protect Mode. When in the Protect Mode I could not enter and use the Line PC Solenoid Output Control Function of my Tech 2 Scanner. As Steve fr...
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