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Prev Professional Automotive Repair Technical Discussions for October 31, 2011
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Open Help Requests for GM
Help Request Answers
1984 Buick Regal T-Type 3.8L No Start, Cuts out, Stall VIN: 1G4AK4796E
I have a car that was brought to me by a guy who put an engine in and could not get it running. Itís a 1984 Grand National. He put a 1987 module and coil with an updated harness adapter on it. I found he just stuck the cam sensor in without timing it. I correc...
2005 Buick LaCrosse CXL 3.8L headlamps VIN: 2G4WD53205
This car intermittently looses headlamps. Fuses good. Anyone run across this particular problem? We do very little repairs on domestics. Sounds to me like a posible bad contact inside headlamp switch. Any help is greatly appreciated.
2003 Cadillac CTS 3.2L whine VIN: 1G6DM57N73
see repair history-definately from the pump but why only with engine running? does this have a secondary pump on the driver's side or just a tube?
1995 Chevrolet Lumina 3.1L Poor Idle Quality, Hesitation, Surge, Cuts out, mild exhaust backfir VIN: 2G1WL52M4S
Customer brought in this 1995 Lumina, 3.1. They had the orginal engine replaced with one out of a 1997 Buick Century, 3.1 The car runs rough at idle but seems to smooth out as you accelerate. While cruising at 30 MPH you will get an occassional jerk or sputter...
2000 Chevrolet Suburban 1500 LT 5.3L Heat Control VIN: 3GNFK16T3Y
Vehicle came in with no heat control. Replaced blend motor with aftermarket. Heat control then works but is backwards. replaced with OEM with same results. It works fine...except backwards. Thanks in advance
2002 Chevrolet Trailblazer LS 4.2L Air Distribution VIN: 1GNDT13SX2
Trailblazer, kicking my butt. This thing came in to be serviced for sale on the lot (trade in) it sat in the shop, the battery went dead, jumped it off, serviced it, noticed the vents were not operating correctly. Unsure if it was this way before the jumpstart...
2007 Chevrolet Uplander LS 3.9L no foward drive VIN: 1GNDV23167
Scanned vehicle with over 20 transmission codes and 12 engine codes in codes failed since last ignition cycle. has P0722 speed sensor keeps coming back up. Also had many codes in engine side of data. Had many codes in body data side. Vehicle runs fine and has ...
2003 Saturn L200 2.2L Dome Lamp, 3rd Brake light VIN: 1G8JU54F93
This Saturn came in with no dome lamp and no 3rd brake light. I know these vehicles had a lot of problems with BCM, can anyone give me some help on this one.No B+ to either. Fuses good, lower brake lights working.

Fixes & Summaries for GM
Fix/Summary Answers
1992 Cadillac Seville STS 4.9L fuel enable VIN: 1G6KY53B7N
Most responding mentioned the key cylinder which we had eliminated already-the problem ended up being the ECM-the signal was at the ECM from the pass key module but apparently it could not read it internally-installed a delco reman ECM and all is well-Thanks f...
1999 Chevrolet K1500 Suburban 5.7L Starting/ignition VIN: 3GNFK16R9X
Sorry for the delay in posting this. After putting in the circuit breaker, we never had another problem with it starting. We switched out the breaker for a fuse a few times, but still started every time. My best guess is that in moving around all the wires, s...
1999 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W7X
Hello and thanks to everybody i apreciare you guys help. Well i finally Found my problem with this truck, it turn out that the cam is broke right where the distributor gear slides in and makes contact with the camshaft, that explains Why it wasn't getting...
2001 Chevrolet G3500 8.1L Brake Pedal VIN: 1GBJG31G11
Well thanks for all of the suggestion. As it turns out there are no leaks anywhere and we took everything apart. Master Cylinder passed all of our testing. All of the ABS parts are fine as well. It would seem the customer uses the brakes how can we say, too mu...
2002 Chevrolet Silverado 2500 6.0L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCHK29U72
Paul from Oklahoma was dead on.Cylinder #7 was the main misfire causing #2 to also misfire.I found this by checking misfires 3 ways.At an idle,under load and at 2000 rpm.First 2 ways show misfire,at 2000 rpm the cylinder #2 misfire went away and just #7 was mi... Trouble codes: P0300.
1995 GMC K3500 Sierra SL 7.4L Low power VIN: 1GDHK33N7S
Thanks to Bob,Dan and Paul with your fuel info. I happened to find a spec chart on Delphi website for fuel pump specs like volume and such and this vehicle requires 29 GPH of volume and dead heads at 65psi. I rechecked pressure after replacement and pressure w...
2002 Saturn L300 3.0L MIL Lamp on VIN: 1G8JW54R02
well this job was pretty straight forward,thanks to everyone that replied,you were right about the tube on the t-stat housing had to be real carefull to remove it Trouble codes: P0128.
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