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Prev Professional Automotive Repair Technical Discussions for December 30, 2005
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Open Help Requests for GM
Help Request Answers
1993 Buick Century Special 3.3L High cold idle VIN: 1G4AG54N4P
Customer brought us his car with the complaint that on the first start of the day car idles at about 2000rmp for 10 seconds. All data shows OK on the scan tool; but I am concerned with the Block learn--150; Block cell learn--16 Fuel ratio shows 14-8 Not sure w...
2001 Cadillac DeVille 4.6L oil pan VIN: 1G6KD54Y81
Hello, I am repairing an oil leak on this car, & removed the oil pan to replace the gasket and found that the engine has a n aluminum plate between the pan and the engine "lower case" (oem refers to it as an oil distrobution plate) In order to make a solid r...
1993 Chevrolet S10 Blazer Tahoe 4.3L transmission VIN: 1GNDT13W1P
Please help. The transmission is losing fluid from somewhere around the input shaft (torque converter). This is the second junkyard transmission with the same problem. Customer doesn't want to spend alot of money, so I'm wondering if there is any way to repair...
1996 Chevrolet Express 2500 5.0L Hesitation, Surge, Stall, Misfire, MIL Lamp on VIN: 1GCFG25W3T
Hello i have this van that does have a 4.3 in it. im looking for ground g103 alldata list it as being at the alt. it also list g102 as being at the alt. i have hunted this thing up one side and down the other, no luck. they are not there. i have three gounds a...
1997 Chevrolet Express 1500 5.7L Misfire VIN: 1GBFG15R7V
Hi to all, this van came in with an intermitant skip in the #5 and #7 cylinders. That's what the computer showed and I verifyed it with a scope. The #5 and #7 spark plugs showed a good deal of ash fouling and the plug wires appeared burned. After replacing bot...
2000 GMC W3500 5.7L Engine VIN: 4KDB4B1R21
This is a Cab chasis medium duty W3500(GMC/Isuzu Cab over truck). The truck came in for exhaust leak. Found the right side manifold cracked and the manifold to pipe donut gasket missing. when the new parts arrived we went to start the truck to pull it in the g...
1996 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB124XT
ok car was towed in, crank no start theft light was flashing, had code p1629. theft fuel enable incorect, no signal. so i replaced lock cylinder and sensor. re-learned system car started and ran fine for about one weak. now car wont start at all theft light is...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Buick Skylark Custom 3.1L Speedometer VIN: 1G4NJ52M9T
Thanks to everyone who helped with this one, I repaced the wiring for the radio from a salvage car. speedo works and shifts fine. thanks again.
1996 Buick Century Custom 3.1L Hesitation, Cuts out, Misfire VIN: 1G4AG55M3T
Well, we'll call this one fixed, and thanks to all who took time out of your busy days to help!! The problem has not, even in the least returned since cleaning the maf yesterday. The customer opted to take the car, we'll worry about the fuel trim next week, by...
1999 Buick Park Avenue Ultra 3.8L abs light on VIN: 1G4CU5216X
thanks to all who replied!! i did go back and spend some more time looking at the wiring and still did not find any problems with it. i reconnected everything after it sat over night and the light stayed off and everything was ok. i still dont know exactly wha...
1999 Chevrolet C3500 7.4L Excessive Emissions VIN: 1GCDC5TTTV
This one is done and gone, putting the cats on really cleaned it up nicely hc and co were very low. But I am still unsure of the injector current pattern. I know what good ones look like but have not been able to find this pattern in the iatn waveform library.... Trouble codes: P0125, P0338, P0175, P1153.
2000 Chevrolet Silverado 1500 5.3L Surge, Chuggle VIN: 1GCEK19T1Y
We have determined that this vehicle does have an internal trans. problem. We do not perform trans. repairs here. I sent vehicle back to dealer for repair. If I recieve any more info on this vehicle I will post it. Thank you for the 8 replies, it always keeps ...
1999 GMC Savana 2500 4.3L No Start VIN: 1GTFG25W3X
ignition and electronics all check out, when i did fuel pressure test I had 70 at rail and 45 6 hours later.Later fuel pressure test I had 5 lbs and lots of flow. 70 lbs pressure at the fuel filter Pulled out spider,everthing dry, no washing. Contacted Linder ...
2000 Hummer H1 6.5L slips out of overdrive VIN: 137ZA8432Y
we replaced the tcc solenoid and a sonax valve kit the check engine lite stays off now but still falls out of od the customer is bringing the car back after new years thanx for all the replies
1992 Oldsmobile Custom Cruiser 5.7L Excessive Emissions VIN: 1G3BP8373N
This morning with a clear head and a little insight from some IATN members I went back to work on this problem,Thanks to Doug Carrol I was reminded that the effected circuit comes from a QUAD driver,and also that he thought the vehicle had to see a speed senso... Trouble codes: 32 (EGR system error stored but did not have check engine light oncode has been cleared and has not reset as of yet.).
1992 Pontiac Sunbird SE 2.0L rr wheel VIN: 1G2JB34H5N
I ended up replacing the brake shoes in the rear with a/c delco shoes, the problem never showed up again, thank you very much for your help
1992 Pontiac Grand Am SE 3.3L Poor Idle Quality, Surge, MIL Lamp on VIN: 1G2NE14N3C
Thanks to all who replied. I replaced the 2nd gear switch (OEM)and it took care of the DTC 26,27(rember i have already replaced the TCC with an OEM part). Maybe due to the common ground in the wireing harness ,was what made these two codes related? As to the s... Trouble codes: DTC, 26 (QDM failure), DTC27.
1997 Pontiac Firebird Formula 5.7L speedometer VIN: 2G2FV22P8V
Well, we still could not ever duplicate the problem. Checked for the speed sensor connector having a problem while vehicle running in the air with Vantage backprobed into the VSS wires at the PCM and couldn't make it act up. One suggestion to run new wires t...
1998 Pontiac Grand Am SE 2.4L engine lubrication
just today i put this wreck back together. before i put the oil pump back i removed the oil filter and the oil pressure sender and forced air through the oil passages both ways. after reassembly i measured the oil pressure and it was 65psi@idle and at 3000 it ...
1999 Pontiac Sunfire SE 2.2L Hard Starting VIN: 1G2JB5245X
I am going to post this one as a fix. I first replaced the fuel pressure regulator in hopes that this was the problem. I did not fix it. I then replaced the TPS and it has started the most times without causing the problem. I also purged the fuel system just t...
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