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Prev Professional Automotive Repair Technical Discussions for March 9, 2009
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Open Help Requests for GM
Help Request Answers
2003 Cadillac CTS 3.2L ipc VIN: 1G6DM57N53
is anyone familiar with the starting system on this cts???alldata diagrams show a generic depiction of b+ ON switch closed to just one yellow wire to ecm crank voltage pin 17... what is this pink wire and where does it go... have checked all fuses underhood, v...
1991 Chevrolet V3500 Silverado 6.2L trans VIN: 1GCHV33N3M
Hi everyone.I need help with this beast again.I have one problem left with this transmission.It slips in 1st gear when pulling out onto the street from work-once the speed is fast enough it shifts to second and all is well.Code 85 sets and will remain until ne...
1995 Chevrolet K2500 6.5L No Start, Cuts out VIN: 1GCGK29F3S
vehicle came in complaining of battery light on, hard to start, trans. going into limp mode. We got it checked for codes found codes 84,99 ckecked charging system it had one battery a little weak but was charging 71 amps @ idle so we checked voltage & grounds ... Trouble codes: 84 (accelerator pedal position circuit fault), 99 (accelerator pedal position 5v reference fault)
2003 GMC C4500 Topkick C4C042 6.6L Mechanical VIN: 1GDE4E11X3
Truck was towed in after it shut off on customer, changed fuel filter and primed system. Truck started and ran fine, would start the next day. If let sit for 3 days the truck will not start, thought maybe after market filter could be the problem, put GM filter...
1997 Oldsmobile Silhouette 3.4L Door locks and Dome lights VIN: 1GHDXO6E4V
Vehicle towed into shop for no start, cranks and runs for 2 seconds and kills. I noticed the door locks didn't work and the dome light either. I got a code P1629. I was doing some testing at the BCM connector C1 had 12v at both orange wires but not at the dark...
1987 Pontiac Sunbird 2.0L No Start, Hesitation, Stall, Misfire VIN: 1G2JB51K0H
the car runs and drives great some times. But then it will just start runing real bad missing spiting and sometimes it will just die. Then it will be hard to start. then u let it sit and cool down and it will run great agine. thanks jay Trouble codes: 23 (manifold temp too low), 42 (electronic spark timing est problem)
1997 Pontiac Trans Sport 3.4L Taillights and dash lights VIN: 1GMDU03E5X
This vehicle has been acting up on and off for a while according to the customer. The vehicle came into our shop with no tail lights or dash lights, the customer cycled the key on and off 5 times and the lights would flash. I checked the wiring schematic and f...
2000 Pontiac Bonneville SE 3.8L Poor Fuel Economy VIN: 1G2HX54K8Y
Customer brought this car in with the complaint that the fuel milage dropped from 30 mpg to 20 mpg. He changed plugs and cleaned the MAF sensor with no improvment. All the codes I found were history codes. No current codes. On my test drive long term and short... Trouble codes: P1602 (Loss of electronic brake traction control module serial data), P1626 (Vehicle theft deterrent fuel enable signal lost), P1811 (Maximum adapt and long shift)
2004 Pontiac Vibe 1.8L MIL Lamp on VIN: 5Y2SL62814
We have replace the oxygen sensor twice with a AC Delco unit and we continue to get the same code. Found a TSB for a Toyota Matrix for this code but nothing for the Vibe. Tried to get the Toyota deal to re-flash the computer and they were afraid they would blo... Trouble codes: P0133 (slow response oxygen sensor)

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Riviera 3.8L Poor Idle Quality VIN: 1G4GD22K65
First of all let me thank everyone for so many replies.Everyone zeroed in on possible leaking fuel regulator, or injector. regulator is good, pulled fuel rail and pressurized no leakage. Next concern was spark leakage firing cylinder at wrong time, all wires a...
2002 Buick Regal LS 3.8L extended crank VIN: 2G4WB55K82
Thanx to all who sent in their findings. Had the customer leave the car for a couple of days. We checked it whenever we had a chance. Finally caught it acting up. Sure enough there was fuel in the vacuume line to the fuel regulator. Changed it and the customer...
1999 Cadillac Catera 3.0L Misfire VIN: W06VR52R1X
It appears that when the trans was removed, the engine tilted just enough to crack the hardened plastic vacuum line to the booster. After smoke testing and shaking the lines, I finally found the problem. Thanks to everyone offering their help.
1995 Chevrolet Camaro 3.4L Runs rich VIN: 2G1FP22S1S
We have finally got to the bottom of this one, there were several layers of problems. Many of the replies mentioned a problem with the fuel pressure regulator, experience with GM products caused us to check that first thing and it was not leaking. Part of the ...
2002 Chevrolet Astro 4.3L rear defogger VIN: 1GNDM19X18
hotdamn it's fixed. new control head fixed the issue. the dead 30 amp fuse is the circuit protection for the rear grid that is feed from the control head. thanks to all for the diagrams and insite on this van. with out a wiring diagram your only guessing. than...
2003 Chevrolet Silverado 3500 6.6L Battery VIN: 1GCJK39113
Well this truck is fixed, we looked at the drivers fender under the fuse block that they call the house for the mouse. It was good. Man I would of thought that was the problem NOT. The problem was in the dash i/p cluster, we left the truck set for four days wi...
2004 Chevrolet Blazer LS 4.3L security VIN: 1GNDT13X94
Hello everyone and thanks for the response. After removal of the panels, we found a code alarm remote start system. Found the orange/black wire was tapped into with the yellow wire that was cut completely from the ignition switch with a resistor to make the BC...
2004 GMC Sierra 1500 SLE 4.8L Electronic brake controler VIN: 1GTEK19VX4
Thanks for all of the replies most of you hit it on the head the wire was still taped up in the harness plugged it in and darn it worked LOL thanks again for the help guys everyone out there in IATN land have a good day
1999 Oldsmobile Alero GLS 3.4L Poor Idle Quality, Stall VIN: 1G3NF12E5X
Thanks to all the guys that replied. it ended up being that the rear plenum gasket nylon lock tab was damaged, and sticking up causing a vac. leak, repaired gasket and changed out O2 sensor, and all seems to be working great now. thanks again, I really appreci...
2001 Oldsmobile Aurora 3.5L MIL Lamp on, oil pressure light VIN: 1G3GR64H71
I tried grounding the battery cables together, no effect. Customer doesn't want to spend money, so vehicle is leaving the shop. Thanks to all who replied. Trouble codes: P0463.
1996 Pontiac Grand Am SE 2.4L abs module VIN: 1G2NE12T5T
We replaced the dash and it fixed the anti/theft light problem. The customer took the car with the abs and air bag light on as the did not want to spend any more money.
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