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Prev Professional Automotive Repair Technical Discussions for February 10, 2009
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Open Help Requests for GM
Help Request Answers
1991 Cadillac DeVille 4.9L Hesitation, MIL Lamp on VIN: 1G6CD53B2M
Good morning team,I have a 91 cadi came in w/ a lock of pwr,cust had a complet tune,distributor R/R & a set of injectors all 8 R/R.first I verify that my IGN timing was correct,fuel p.s.I w/ spec 40 at idle 45 w/ vacuum,profrom compresion test 160 all 8 cyls.p... Trouble codes: 23 (EST circuit problem.)
1998 Cadillac DeVille 4.6L abs VIN: 1G6KKD54Y4
Cant find were the black wire with small end, same size as the wire that goes on the back of the ABS motor From what I could find in a 96 manual only one wire goes on the ABS for ground, it comes out of the loom going into the fuse block with the 50 and 60...
1994 Chevrolet Corvette 5.7L Poor Idle Quality, Hesitation, Surge VIN: 1G1YY22P7R
Hello fellow techs. I need help with this Corvette. This car will run fine for a while and then start surging and hesitating. When this happens I lose all comunication to the PCM. Do these cars have a history of PCM's going bad? All help is as always very much...
1998 Chevrolet Tahoe LS 5.7L transfer case VIN: 1GNEK13R2W
Greetings 4x4 wizards. This 98 Tahoe was left here for us by one of our out of state customers who said he's been battling an intermittent 4x4 problem for some time. The previous problem with this vehicle was that it sometimes wouldn't come out of 4x4 or would...
1999 Chevrolet Cavalier 2.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 3G1JC5248X
Hello.I have a 1999 cavalier that isn't running the best,the cat has good spark,running and starting.fuel system is within spec.has 17 inches of vacuum at idle,and has no codes stored in the while scanning looks to be all normal.The car will die if th...
1999 Chevrolet Tahoe LS 5.7L TCC Solenoid VIN: 1GNEK13R7X
Hello to all: When driving at 60mph after complete warm up the vehicle starts to have the feeling like something is cutting out for a split second. The only reading on a Tech 2 scanner is that the TCC slip speed goes from 0 to +90 rpm. This happens every five...
2001 Chevrolet Express 3500 6.5L Cuts out, Injection Timing VIN: 1GCHG39FX1
Need some Help, I replaced the Injection pump due to Engine ShutOff Solenoid was open. Installed new pump, Runs fine till [...] coolant temp, computer tries to control timing and it cuts out. Scanned, TDC is +2.46 deg (maxed out) Inj Timing at 0 The pump...
2001 Chevrolet Prizm 1.8L park lights VIN: 1Y1SK52831
Hello this prizm is back. I replaced the DRL module and that fixed the head lights from staying on all the time. Now it is back and the running lights stay on. I am assuming the module went bad because when I plug the old module in the running lights work prop...
1999 GMC 6500 7.4L No Start VIN: 1GDJ6H1D0X
This truck is at another shop and they called and asked for help. Truck came in will start and run for 2-5 seconds and shut down. Has a new Jasper engine and the customer informed us its have been 200 miles since the engine install. We are losing the injector ... Trouble codes: P0336 (Crankshaft Position Sensor performance)
2001 GMC Sierra 3500 SL 6.6L No Engagement VIN: 1GDJC39171
Hi Guys, This is a new one for our shop, as it is our first Allison 1000 problem. This truck was involved in a small accident to the left front. No major damage, just fender and grill replacement, and hood repair. 3 days after the accident (before body repai...
1991 Oldsmobile Cutlass Ciera S 3.3L water pump VIN: 2G3AJ14N3M
Knocking/rattle noise only at idle.Near water pump. Replaced belt tensioner due to common bearing fix. WILL NOT MAKE ANY NOISE WHEN RUN WITH SERP BELT OFF. water pump bearing does not feel worn or loose. Using stethoscope, noise is near water p...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick LeSabre Custom 3.8L No Start, tach inop VIN: 1G4HP54K0Y
As of now I have condemned the PCM in this car, and since the customer has declined to make the repairs if it needs a PCM(this is a hi mileage vehicle with several other problems) I will close this with a summary. But since the car is still at the shop, I c...
1993 Chevrolet Lumina Euro 3.1L Surge, Cuts out, Stall, MIL Lamp on VIN: 2G1WN54TXP
Clean the throttle body and Idle Air Control motor and passages. 1) Start the engine and warm it up to operating temperature. 2) Turn engine off. 3) Disconnect battery to clear any memory from ECM, then reconnect the battery. 4) Ensure that the thrott... Trouble codes: 44 (lean exhaust).
1999 Chevrolet Silverado 1500 5.3L Poor Idle Quality, HARD START VIN: 1GCEK14T7X
I decided to recheck the fuel pressure regulator again and found it to be leaking fuel into the vacume hose. i didnt leave the vacume hose off long enough the first time i checked it. starts and idles great now thank you everyone for your help.
2000 Chevrolet Blazer LS 4.3L 1-2 shift VIN: 1GNDT13W3Y
After second guessing myself too much, I reinstalled the pan with fluid. Cleared codes. Vehicle went to 1st gear and shifted normally. The 1/2 shift solenoid fixed this one. I just couldnt seem to verify that while it was on the rack. Thanks for the input...
2000 Chevrolet Express 3500 5.7L Mechanical VIN: 1GCHG39R1Y
Thanks for all that helped. I had customer check RPO's on both vans and they both have MT1 code. I informed customer that the transmissions should interchange. I'm currently waiting for customer to O.K. us to swap transmissions. I'll post another request if I ...
2003 Chevrolet Impala 3.4L Unknown VIN: 2G1WF52E33
I ended up sending this car to the dealer to get a BCM replaced. Thanks to all of the replies
2004 Chevrolet Tahoe LS 5.3L Driver Info Center VIN: 1GNEK13Z64
So here is the final word: it has to go to GM (so someone who is a TIS subscriber). They have to download the software. Even if I have a Tech2, I cannot do it. So, off it goes to the dealer... Thank you for all your help!
2000 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5270Y
Thanks to everyone for your replies. I am sorry for wasting your time. Perhaps someone will be able to benifit from our stupidity. When the vehicle came back in it had a different evap code a vent code. We had left a pair of vise grips on the vent tube fro... Trouble codes: P0442 (EVAP system leak small).
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