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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 15, 2005
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Open Help Requests for GM
Help Request Answers
1995 Chevrolet K2500 Cheyenne 6.5L turbo VIN: 1GCGK24F4S
CHEVY DIESEL GUYS, i HAVE A LOW Mileage 6.5 turbo diesel that runs fine when not under load. If im pulling a car trailer or pulling up a hill, it puts out quite a bit of smoke and the check engine light comes on. If you let off on the throttle the check engin...
1996 Chevrolet Cavalier 2.2L ignition cylinder VIN: 3G1JC5245T
Vehicle towed into shop with ignition cylinder stuck in lock position. Unable to turn key to run, start or acc. Problem is we can't get this lock cylinder to come out. My best guess is that it's stuck somewhere between two positions, not allowing the release t...
1999 Chevrolet Malibu 3.1L abs light on codes c1235/c1234 VIN: 1G1ND52M9V
HELLO: Still racking my brain on this one, car came in shop needs engine, & abs light was on, replaced engine and abs light is still on, but noticed someone has allready been doing some work on it before, main fuse box has been removed,and instrutment cluster ...
2003 Chevrolet Silverado 2500 HD 6.0L srs VIN: IGCHK29U93
This truck came in with a air bag light on. We tried to retrieve codes and could not. We have a snap on MT2500. called Identifix and they said should be no problem with communication snap on diagnostic said the same thing. we replaced module and light is still...
2003 Chevrolet Silverado 2500 6.0L Poor Idle Quality, Stall VIN: 1GBHC24U23
we have this truck that wont idle when hot stalls everytime coming up to a stop sign they are telling me its a fly by wire system that has no throttle cable can someone tell me how this system works has anyone have any troubles like this one the truck runs fin...
1994 GMC C3500 Sierra SLE 6.5L No Start, Stall VIN: 1GDKC34F3R
I messed up this is a 94 truck, check fuel preesure yesterday after opening the request. Was 5psi replaced lift pump. No change in the operation. Truck still starts and dies. Have had replies conserning the module on the side of the injection pump. If I unders...
2000 GMC Safari SL 4.3L Surge VIN: 1GKEL19W3Y
This vehical,has a surge type feelpng at 45-55 mph, have watched o2 sensors for a missfire, o2 sensors hold a good squre pattern, in lock up I have 6-156 rpm slip at converter.does't feel like a misfire, more of a surge feeling.
1994 Oldsmobile Cutlass Supreme S 3.1L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G3WH15M4R
Hi Folks, This 1994 Oldsmobile Cutlass Supreme has got me baffled! It originally came in the shop with a ôstalls on deceleration / coast down from about 30 mph". The tech replaced air & fuel filters (fuel filter was hard to blow through). Car ran fine on the... Trouble codes: 13 (o2 sensor error), 33 (map sensor high)
1994 Pontiac Bonneville SE 3.8L Cuts out, MIL Lamp on VIN: 1G2HX52L4R
Greetings to all I have recieved this car from a shop that has put in alot of new parts to try and repair it but they did not seem to find the problem.I did scan the ecm for codes and had two codes po341 po342.I have scoped the cam and crank sensors while the ... Trouble codes: P0341, P0342
1998 Pontiac Sunfire SE 2.2L Excessive Emissions, Cuts out, Poor Fuel Economy, MIL Lamp on VIN: 1G2JB124XW
at first when this car came in with black smoke, had bad etc, changed the sensor and fuel filter ,clear the computer and drove the car . noticed some improvement. after about 25 miles check light came on . this time codes were p0108, p0404, p1133 and p1404. in... Trouble codes: P0117 (temp. show -40 f), P0108 (map high), P0404 (egr), P1133 (o2 sensr), P1404 (egr)
2001 Pontiac Grand Am SE 2.4L high idle speed VIN: 1G2NE52T81
Hey all, I have this grand am here driving me nuts. should have been simple job. vehicle came in with no problem except MIL on. scan with MT2500. code P0122 in memory. looking at freeze frame data I saw TPS voltage at 0.00v. checked TPS with graphing meter and... Trouble codes: P0122 (tps voltage low)
1991 Saturn SC 1.9L No Start VIN: 1G8ZG1470M
What am I missing? Engine cranks but won't start. I have no spark, a very weak injector pulse, and no tach movement. Scope tested CKP signal, 6X signal, 2X signal, and tach signal and they all look good according to Mitchell and iATN waveform library. Power an...
2002 Saturn L300 3.0L blows fuse VIN: 1G8JW54R52
vehicle came in starts hard all the time so we started checking basics, fuel preasure is good spark good. but it has a missing fuse, controls B+ which according to what I find is for the engine and transaxle control modules, does any body have any ideas? I wil...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick LeSabre Custom 3.8L 4th converter slip at 650 rpm VIN: 1G4HP52K2T
Thanks to everyone!! It turned out that I overlooked the 4th gear clutch hub splines. This is only the 2nd one of these trans that I have tore appart and when I looked at that hub shaft it looked to me that is the way that it is made. MY FALT. I realy do apper...
1992 Cadillac Eldorado 4.9L cluster, AC controls VIN: 1GEL13B1NU
wel its been 3 days so I'm calling it fixed. I'm not sure of this, but Eldo's maybe different from the other caddy's of the same vintage. Anyway, it seems the IPC is the master of communications and all the others slave to it. It was weird that I could still c...
1988 Chevrolet Sprint 1.0L Cuts out VIN: JG1MR6150J
We found an internal vacuum leak in the PCV system and replaced the carb with an non-electronic one,car is not running perfectly but is driveable and is much better than it was.Thanks to all who replied , Ted.
1991 Chevrolet Topkick 427CID Poor Idle Quality, Hesitation, Stall VIN: 1GD57HAM3M
Well, the nearest heavy truck dealer is an hour away, but I went over and borrowed there manual and found that the fuel pressure needed to be about 30 lbs. for this truck to run well, adjusted the screw on the pressure regulator and all was well. I will try to...
1996 Chevrolet K3500 Silverado 5.7L Fuel gauge VIN: 1GBJK34R1T
Thanks for all your replys. We found a wire that was partially worn through under the brake booster unit. We replaced the piece of wire and everything is fine.
1996 Chevrolet K3500 Silverado 5.7L Fuel gauge VIN: 1GBJK34R1T
Thanks for your replys. we found a wire that was partially worn through under the brake booster unit. Repaired the wire and everything is good. It must have been picking up a transcient ground somewhere.
1998 Chevrolet K1500 Cheyenne 5.7L MIL Lamp on VIN: 1GCEK19RXW
Thanks to those whom took the time to reply. Special thanks to Ben from Montana who had experienced the same problem. After reading his reply i rechecked the wiring harness to the 02 sensors and had found that bank 2 sensor 1 connector had broke and was interm... Trouble codes: P0102.
1998 Chevrolet Prizm 1.8L No Start, Cuts out, Stall VIN: 1Y1SK5289W
Thanks to those who took time to respond. I found a melted splice connector under drivers side kick panel that supplied B+ to mulitple relays and sensors. Noticed an update to this condition that eliminates the connector and solders all wires together and cove...
2000 Chevrolet Blazer LS 4.3L suspension VIN: 1GNDT13W4Y
I would like to thank everyone that responded to our help request. We got several responses stating to look at the torsion bar mounts and a few stating it might be a transfer case problem. We replaced the control arms on the left side to correct the problem. w...
2001 Chevrolet Astro LS 4.3L shift VIN: 1GNDM19W21
I replaced sun reaction shell, torque converter and a rebuilt valve body with all updated valves. Now it has no slippage and no code P1870. But never got rid of the harsh shifting. It only has very harsh shifting in 1st to 2nd gear and not as harsh in other ge...
2000 GMC Jimmy SLS 4.3L temperature VIN: 1GKCT18W2Y
Thanks to all that responded. I replaced the radiator and throughly inspected the fan. The vehicle will not show symptoms for a week or two. I'm confident with the diagnosis as lower rad hose and rad were badly coated with rust and whatnot. There was alot of s...
2000 Saturn LS2 3.0L No Start VIN: 1G8JW52R4Y
Thanks to all who replied. The problem was the customer had replaced his own battery and it was smaller than the original. The insulator wrap around the battery is cut out just enough to allow the square around the terminals to be exposed. With the smaller bat... Trouble codes: 22 (trans codes), U2103 (fewer controllers on bus than programmed), U2104 (can bus reset counter overrun), U2105 (lost communication with ecu system), U2106 (lost comm. with TCM system), U1000 (class II data link malfunction).
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