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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 12, 2004
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Open Help Requests for GM
Help Request Answers
1991 Buick LeSabre Limited 3.8L MIL Lamp on VIN: 1G4HR54C5M
This vehicle had a cam sensor code, checked signal when light was on, no signal. When the light was off, the signal was off. replaced cam sensor. Two days later, light was back on, found cam sensor signal erratic again. replaced cam sensor again. fix lasted on... Trouble codes: 41 (CMP Sensor Failure)
1962 Chevrolet IMPALA 283CID seals VIN: 21867B1175
i am trying to find repair info and estimated labor time for this car's axle seals. they appear to be more like a ford setup, i haven't worked on this type of gm rear and can't tear into it without an estimate. would appreciate anyones help here. thanks, john
1985 Chevrolet Corvette 5.7L No Start VIN: 1G1YY0788F
No-start: Verify fuel pressure, and injector pulse good, no-spark present. Power @ coil, (via voltage drop), good waveform signal from pickup in dist., no waveform signal coming from ICM (7 pin style), no duty cycle coming from ICM, Tests performed KOEC. Inst...
1996 Chevrolet C1500 Suburban 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GNEC16R0X
Well, every diagnostic we have run has shown components/ results good. Scope shows even spark strength/dwell, injector leakdown, all injectors within 1 psi of each other. backprobed injector circuit, operating as designed. checked injector control circuit back... Trouble codes: P0300 (random misfire)
1996 Chevrolet C1500 5.7L Misfire, MIL Lamp on VIN: 2GBEC19R5T
Vehicle has a definite bad B1/S2 HO2 sensor. Exhibits a missfire, mostly on cyl's 5, 6 &7. It will occur after it warms up to above 150 deg. F. and shows up in park accel lightly from 2500 to 3000 rpms and driving, on light accel or sustaining speed on slight ... Trouble codes: P0141 (Bank1/Sensor 2 O2 Heater Performance), P0161 (Bank2/Sensor2 O2 Heater Performance), P0172 (Bank 1 Rich), P0175 (Bank 2 Rich), P0300 (Eng Miss detected multiple cylinders), P0420 (Bank 1 Catalytic Converter Performance)
1997 Chevrolet Tahoe LS 5.7L 2-3, 3-OD shift VIN: 1GNEC13R9V
Transmission recently repaired due to broken nose on reaction sun shell. Put Trans-Go kit in, modified valve body spacer plate, different springs, valve, etc... Tranny shifted beautifully. 2 months & 2000 miles later, suddenly developed primarily 2 to 3, & 3 t...
1999 Chevrolet Venture 3.4L bcm VIN: 1GNDX03E8X
pass key lt stays on and was not on before
2001 Chevrolet Impala 3.4L starter VIN: 2G1WF52E91
concerns with the vehicle. traced wiring harness and tessted relay. good power to the relay. on both sides. if jump relay starter will turn over. for some reason the ground is not being supplied to the relay(crank relay)wiring showes relay being grounded from ...
2002 Chevrolet S10 2.2L Hesitation VIN: 1GCCS14571
This truck is used every day for parts delivery. So I guess you could say it operates under hard driving conditions. The problem has me stumped. When pulling out into traffic after coming to a stop it will fall on its face, Lose power, however it dose not di...
1992 GMC K3500 Sierra 5.7L engine VIN: 2GDHK39KXN
Hello I have have phoned are engine rebiulder and some recyclers in the area. no one seems to have done this, so no defeneit answer. What I have is a 92 350 cid 4x4 light duty 1 ton [aluminum front diff]. He has access to a 92 454 cid hd 1 ton two wheel drive ...
1995 GMC C1500 Suburban 5.7L no 2-3 shift VIN: 1GKEC16K2S
well, first thanks in advance for any help on this.. i have a 1995 gmc with a 4L60E transmission came in trans sounded like it was coming apart.. would not shift out of second gear. took apart planatary gone.. rebuilt with new front and rear planatary's clutch...
1996 GMC Jimmy 4.3L No Start VIN: 1GNDT13WXT
replaced head gaskets, trying to put distributor back in place (was marked) will not go in, put at cylinder #1 top, tryed to install distributor with rotor button in correct spot (as per mitchell) will not go in, any suggestions??
1997 GMC Safari SLE 4.3L vents VIN: 1GKDM19W2V
we have this van that under acceleration will drop vent operation to defrost - have replaced check valve and repaired on broken vacuum line - still happening - have good vacuum supply - vacuum test all line at connector at rear of control head and all hold goo...
1984 Oldsmobile Omega ES 2.8L Torque convertor? VIN: 1G3AE37X6E
Hello fellow transmission gurus. I'm lookin for some help with this 125C trans problem. This car is a winter beater that received a bare bones tranny overhaul a while back and has virtually no mileage on it since. After sitting for two or three days, the car w...
2003 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52K13
I could realy use some help right about now! Got this GM with MIL on and code P0171 fuel trim system lean. Checked scan data, fuel trims indicating lean condition. Vehicle runs a little rough when in open loop, and smoothes out with propane. Runs ok in closed ... Trouble codes: P0171 (Fuel trim system lean)

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Regal 3.8L Misfire VIN: 2G4WN23L4P
Thanks to all who replied in a very quick manner. Evidentally the tranny fixed one problem and the customer came back with a different complaint. I found the plug wires bad and did an injector flush and the vehicle now runs like a top.
1997 Buick LeSabre Custom 3.8L speedometer jumps VIN: 1G4HP52K0V
Thanks again for all the quick responses, the fix for this vehicle was the speedo head (got a factory reman/exchange), I did unplug the alt. as some replies had noted with no luck ended up selling the cust. the speedo head ,all is good now Thanks again for the...
1987 Cadillac Fleetwood 4.1L Alternator VIN: 1G6BC5181H
Thanks Guys, After studying the wiring schematic I found that someone had changed the pigtail to the alternator and had crossed the [...] & gray wires. I put them bach and it works great. That is why it started to charge when I energized the ecm wire. Any how ...
1995 Cadillac DeVille 4.9L Turnsignals VIN: 1G6KD52B6S
A great big thanks to Stephen & Jerry. It turned out to be the turnsignal module(flasher), located under the instrument cluster on the left side of the steering column. IATN is GREAT!
1986 Chevrolet Camaro Z28 5.0L no injector pulse VIN: 1G1FP87F1G
thanks to all who gave us help on this one , we tried new tps, new dist, still no injector pulse, we have signal to ecm from dist., good power and grounds to ecm, two reman ecm, new gn prom, we will now get new gm ecm and try that, thanks again will let you kn...
1997 Chevrolet Lumina 3.1L Cuts out VIN: 154YGP45OI
First of all I would like to thank all the techs that replied to my call for help. The vehicle has not returned after installing crank sen. and repairing wiring to crank. 24' harness was bare.I believe the problem was the wire thanks once again
1999 Chevrolet Tahoe 5.7L unknown VIN: 1GNZK13R5X
after reading on more than one of your replies to check the system connections i found the high side connected to the bottom of the condenser. swapped connections and guess what it worked! Thanks from everyone, I hope to be able to return the favor. Eric [...]...
2000 Chevrolet Malibu 3.1L light on VIN: 1G1ND52J7Y
thanks to those that replied. appears that this problem is the bcm. customer directed to gm dealer for reprogramming of bcm.
2001 Chevrolet Silverado 1500 4.3L Misfire VIN: 2GCEC19W61
checked back pressure on that bank, cat was stopped up. had less than 80.000 miles ,dealer fixed under warranty. runs fine. thanks for all the help. glen Trouble codes: 0300 (ramdon cyl. misfire).
2003 Chevrolet Silverado 3500 LS 6.0L Stall VIN: 1GBJK34U93
Thanks for the help guys. after a lot of phone calls to the manufactuer Turns out the manufactuer has an up graded spool valve & manifold assembly for this model,(Thought I wont see it for about a month), so my hudraulic tech made up a new relefe valve & we ar...
1999 Oldsmobile 88 Royale 3.8L lights VIN: 1G3HN52K9X
We found a shorted harness running down the front of the dash, past the heater box, down under the carpet, running to the shift console. At the point where it turned and traveled along the floor pan, it had worn through the protective cover of the harness and ...
1992 Pontiac Grand Prix SE 3.4L No Start, Stall VIN: 1G2WJ14X2N
Thanks for the replies and sorry for the delay in closing this request out. The shope owner talked the vehicle's owner into taking the car to Pontiac. They replaced the crank sensor and ECM. Personally I do not like to replace ECMs without a second opinion. ...
2001 Saturn SW2 1.9L Electronic VIN: 1G8ZN82761
this one i fumbled the ball on after hearing from all replies i figured that the condition was normal. i did change the fan relay to make sure. the thing that threw me off was there was no evidence of the fan timer in the mitchell diagram. maybe this was added...
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