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Prev Professional Automotive Repair Technical Discussions for August 4, 2004
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Open Help Requests for GM
Help Request Answers
1982 Buick Century Limited 3.0L Hesitation, Stall, MIL Lamp on VIN: 1G4AL27E5C
Can get car to run great in the bay but will not accelerate under load. Mc readings are all over the place, one minute it will be lean then go rich. Have tried the troubleshooting tree for an 83 model and the dwell readings change from one side to the other ma... Trouble codes: 44 (Lean Exhaust)
1994 Cadillac Eldorado 4.6L No Start VIN: 21.353
We have a 1994 eldo when starting engine starts runs for 2 seconds then shuts off no injector pulse but spark is ok we keep getting map sensor codes but i believe thats from the engine dieing tryed a nother computer same thing any info would be a great help
1992 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2G1WL54T5N
This car will start and idle for a short period of time before it starts to cut out and ultimately stall. If you put it in gear it stalls immediately. For about 15 seconds after start up it will idle perfectly and rev up with no problems. If at this time you s... Trouble codes: 42 (esc problem)
1995 Chevrolet C2500 Cheyenne 6.5L Hesitation, Stall VIN: 1GCGC24F4F
Customer has been complaining about an intermittant problem with vehicle, after start, up either when cold or warm, this vehicle has a bad hesitation on acceleration and 1-3 times a day it will stall about a block or two after start up, but always seems to res... Trouble codes: 78 (wastegate solenoid problem)
1996 Chevrolet K1500 5.7L Unknown VIN: 1GCEK14R8T
4l60E trans. no 2nd gear. trans feels good. dropped pan, inspected and no bad material in it. fluid seems good. no codes. Put gear shift selector in 3rd or 4th, to start driving (so there is no confusion here that its starting in 3 or 4) and 1st gear feels goo...
1999 Chevrolet K2500 Suburban 7.4L a/c system VIN: 1GNGK26J2X
Hi, this truck is a real hairpuller. Customer had repairs done in another shop out of town and it worked for a month or so. We have recharged it 3 times in the last 2 months and it continually comes back in a week or 2 low on freon and not cooling. We have che...
1999 Chevrolet Silverado 1500 5.3L AC Belt VIN: 2GCEC19T4X
Needing help with this one because it doesn't point to a problem that makes sense,This pickup has the seperate AC belt and it has been breaking around 2100 miles ,it's on the 4th one now,.the belt breaks while driving on the highway and without any compressor ...
2000 Chevrolet Astro 4.3L Interior VIN: 1GCDM19WXY
hello gm boys this one has me in a fix.whats happening is the dome lights are staying on all the time what we have found is the courtesy lamp relay will time out , but the inavertant power relay will not un-latch it-self from the bcm. with the tech2 all door s...
2001 Chevrolet Cavalier 2.2L trac VIN: 1G1JC12441
scan ecm found [...] tps tps was found to be working lights and trac lights together.can clear ecm but they come back on and transmission shift hard. thanks for any help. joe
1994 GMC Sonoma SLE 4.3L Surge VIN: 1GTCS19W3R
Hi all. I have inhehearted a problem child from another shop. They have installed a rebiult motor, the engine oil cooler lines let go, destroying the original motor. Cust states that since the motor was installed, it has been a complete dog, no power whatsoeve...
1995 Pontiac Grand Am SE 2.3L Poor Idle Quality, runs rough VIN: 1G2NE55D3S
Car came in running extremely rough when cold. When car warms up the car runs somewhat rough. Checked for codes but not found. Checked fuel pressure, pressure ok. Checked compression: 170 lb all four holes. Replaced spark plugs, boots and ignition housing on g...
1996 Pontiac Grand Am SE 2.4L instrument cluster VIN: 1G2NE52T8T
hello everyone i have a good one for everyone hope someone can help. this vehicle came to me about a month ago all dash lights were on wouldent start well after hours of tracing found a shorted data line to the ipc fixed car started the car was on its way well...
1996 Pontiac Firebird Formula 5.7L headlamp motors VIN: 2G2FV22P7T
This firebird has the automatic headlamp doors. When the headlamps are turned on both motors run for 6 seconds up and down then they stop. I have looked at the schematic and check the power and ground and motor inputs. Everything looks ok. The mechanisms are w...
1998 Pontiac Grand Prix GT 3.8L climate control VIN: 1G2WP12K3W
a few days after performing ac repair customer complained of ac not getting cold. the ac will only get cold (42 degrees) on the passenger side. on the drivers side the the ac will only get down to 70 degrees. the blend door on the drivers side does work and it...

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick LeSabre Limited 3.8L MIL Lamp on VIN: 1G4HR54C8M
I had many hits saying cps magnet off cam gear. This was the problem. What I still do not understand however and what lead me on this wild goose chase is both Mitchel and alldata said I should have 8 to 11 volts at 2 wires in cam plug in. I did not, I had 10.5... Trouble codes: 41 (No cam signal).
1997 Buick LeSabre Limited 3.8L PWM Valve VIN: 1G4HR52K8V
a call to the manufacturer of the pwm valve, Teckpak, yielded the answer to this problem. The Teckpak replacement pwm valve, #K84858, was designed for the cast aluminum cover 4T60E even though it is listed for the stamped metal cover units as well. Solution wa...
1988 Cadillac DeVille 4.5L climate controler VIN: 1G6CD515XJ
many thanks to all who gave there imput to my problem I didnt realize that when working from the passenager side that the codes will show up on the drivers side dash, i was checking pins at the PCM and the climate controler and never sat in the drivers seat to...
1988 Chevrolet Celebrity 2.8L No Start, Misfire VIN: 1G1AWS1W7J
I want to thank everyone who responded, especially Randy [...] who hit the nail.The coils, when looking straight at them from passenger side to drivers side should be: 1,4 ; 3,6 ; 2,5 . As long as each coil has wires going to its designated cylinder pair, it doe...
1991 Chevrolet Corvette 5.7L pcm communication VIN: 1G1YY2389M
well all at this point im still trying to fix this car, i have run the trouble tree 3 times and still keep getting passing results and the last tree item says go to another page which explains to look for opens and shorts, although these have been covered in t...
1999 Chevrolet Astro 4.3L Hoses VIN: 1GNEL19W2X
Sorry for the delay,customer has declined further repairs.She says she has been unhappy with van since new and will trade it now.The replies I received were helpful.The line can be replaced without removing engine.It was suggested two techs would be the best,o...
2000 Chevrolet S10 2.2L Security System VIN: 1GCCS1942Y
Hello Group, I was finally able to find a wiring diaghram and found I had no power to the TBC [Truck Body Control]. I thought I had checked all the fuses initally but being only 45 possible fuses under the hood alone I missed one . Also I was looking for a BCM...
1990 Oldsmobile Cutlass Calais 2.5L water pump VIN: 1G3NL14U4L
i was able to remove the pump and mounting bracket from the block as one unit, then remove the pulleys without having to loosen motor mounts and lifting engine. thanks for the help
1998 Pontiac Grand Prix SE 3.1L Starting VIN: 1G2NJ52M6W
I found that there was a internal short in the pcm. Replaced pcm and now the vehicle shuts down properly with the key. I pulled fuses one at a time till the dash warning light went out with the key in the off position. The lights went out when the pcm fuse was...
1998 Pontiac Grand Am SE 2.4L Excessive Emissions, Surge, Poor Fuel Economy, MIL Lamp on, STFT &LTFT CRAWL UP VIN: 1G2NE52T8W
Replaced trans modulator valve & hose.THANKS to all who responded.Went back & rechecked everything again,including all the grounds,Went over the car again for vac leaks with a stethescope with the probe removed/just the hose found the mod-valve leaking fluid &... Trouble codes: P0171, P1171 (sys lean on accel).
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