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Prev Professional Automotive Repair Technical Discussions for January 27, 2006
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Open Help Requests for GM
Help Request Answers
1995 Buick Skylark Custom 3.1L Cooling Systems VIN: 1G4NV55MXS
Customer brought this car in after changing the thermostat and said it was getting hot. I asked why he changed the thermostat he said because it was getting hot and he thought the thermostat was sticking. I checked it and it acted like it had an air pocket in ...
1999 Buick Park Avenue Ultra 3.8L Surge VIN: 1G4CU5219X
This is the same vehicle that we have been working on for the past couple weeks. To start from the beginning, this car has a surging problem under light acceleration on steady cruise. If traveling about 55 mph, when you try to accelerate to 60 under light thro...
1998 Cadillac DeVille 4.6L lights stay on dash VIN: 1G6KD54Y8W
We have an odd problem with this Cadillac. The customer complains that the dash lights stay on and he hears a clicking noise for approx. 1 minute after the car is cut off. The relay that is clicking is the controlled power relay that is controlled by the bcm -...
1998 Cadillac DeVille Concours 4.6L security light VIN: 1G6KF5499W
customer states that intermintantly while driving, the message "security malfunction, vehicle may not restart" appears. the vehicle will always restart. any help will be greatly appreciated thanks
1999 Cadillac Catera 3.0L Poor Idle Quality, Misfire VIN: W06VR52RSX
after replaceing valve cover gaskets idle became worse. discovered misfires in 135.replaced coil pack(cracked) and new plugs fuel is 26% on that bank on 246 is approx -6 +5%.cleaned maf,reinstalled and made no difference off idle is fine runs fine//no c...
1986 Chevrolet K20 Suburban Custom 5.7L PINGS Bad VIN: 1GBEK16L3G
Thanks in advance everybody,Got this truck in on tuesday with a pinging problem.Test drove and found it did ping real bad under load up hills.Thought ok should be easy fix timing must be too high,checked an it was at 8 degrees inatail,checked mechanical 11 deg...
1989 Chevrolet K2500 Cheyenne 5.7L low reverse band VIN: 1GCGK24K4K
Simple question, should the low reverse anchor pins be flush with the case? I see they are protruding almost 3/16 of an inch.I read a TSB relating to a "no reverse" which directed your attention to the low reverse band ancor pins which might work themselves ou...
1993 Chevrolet Cavalier RS 2.2L Cuts out VIN: 1G1JC1445P
Originally this vehicle would run for a little while (5-10 min) and then get intermittent spark and then lose all spark. Now the vehicle has intermittent spark or no spark all of the time. The crank sensor has been replaced. Two different computers have been t...
1995 Chevrolet C3500 Cheyenne 7.4L to much fuel/misfire VIN: 1GBKC34N2S
customer states that after driving 4-5 miles that the driver side exhaust manifold would get cherry red. So he replaced the plugs and wires and problem still exist. Shop changed the driver side injector,and driver side exhaust manifold gasket. Checked driver s...
1996 Chevrolet Lumina 3.1L rear defogger VIN: 2G1WL52M8T
Hello group, This vehicle presented with a complaint that when cold outside (approaching freezing) the rear window defogger will not turn on. Only after the vehicle warms up will the back window defroster work. All of the control for heated window grid is co...
1997 Chevrolet K3500 Cheyenne 5.7L Rear VSS VIN: 1GCHK34R8V
This truck originally came in with a poor braking complaint. It's a commercially used vehicle, and the maintenance on it was poor. The mechanical condition of the brakes was in dire need of repair (pads, shoes, rotors, drums, and rear wheel cylinders). At the ...
1999 Chevrolet Step Van 5.7L No Start, No Crank VIN: 1GBHP32R2X
This truck came in on the hook with a no crank condition. Installed new battery and still no crank. I checked the Solenoid Assembly Interlock and found a broken cable. Will a broken cable on the solenoid Assembly Interlock cause a no crank? I noticed the volt ...
1999 Chevrolet Blazer 4.3L Transfer case VIN: 1GNDT13W5X
This has been a confounding problem. The symptom is that the transmission appears to be acting up. An almost instant 1-2-3 shift from a complete stop then it will try and go into tcc lockup right after that and almost kill the engine. After a bunch of searchin...
2000 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY32G5Y
hello boys and girls, this veh came in with a MIL and code 0410 only. cleared code and returned to cust after brief visual inspection. came back 2 days later with same code returned after 31 starts. engine runs perfect. no drop in mpg. no vacuum leaks found. o... Trouble codes: 0410 (air injection system)
2001 Chevrolet Silverado 1500 4.3L No Start, Misfire VIN: 2GCEC19W21
hello fellow thech : can sure use some help,vehicle was towed in,no start acts like chevy damp dist assy, checked dist also pulled out and cleaned installed delco cap&rotor also replaced spark plugs were fuel fouled,have good fuel press also have good spark,ch...
2003 Chevrolet Silverado 3500 6.6L Engine VIN: 1GCJK3318F
I am posting this for a buddy having problems at the dealer. He just bought this 03 1ton dually from a GM dealer with 54,000 KM, extended warranty, Allison AT the works. His complaint is when the truck is just warm, not hot, and he's accelerating it will sudde...
2001 GMC Yukon Denali XL 6.0L passenger heated seat VIN: 1GKFK66U11
Hi, everybody ive got a stumper the right side heated seat dosnt get warm ive replaced the cushion element after i tested everything according to mitchell we even tried a new switch to no avail i hooked the old element back up and when i hit the switch the yel...
2001 GMC C3500 HD 6.5L Cuts out, Stall VIN: 3GDKC34F41
this truck starts right away but during the warm up for a 30 seonds or so the truck just quits and the rpm gets lower and lower until the truck dies,it is hard to restart,if you let it sits for 10-15 minutes it will restart and run for the rest of the day,we h... Trouble codes: P0126
1996 Pontiac Sunfire GT 2.4L engine VIN: 1G2JD12T5T
hello,i am in need of some guidance from the quad 4 experts on this great came in from another shop with an overheating problem running down the highway.we pressure checked the system and found the housing on the side of the head leaking and also th...
2000 Pontiac Firebird Formula 5.7L Poor Idle Quality VIN: 2G2FV22G9Y
this car idles at 830-900 rpms in park. iac is 80-85 in idles 840-870 in gear. iac is 152 in gear. watching the iac on the scan tool,when you drop it in gear it climbs to around 152 & you feel the car wanting to push forward. if you let off the brake &...
2002 Pontiac Grand Prix SE 3.1L Hesitation, Misfire, MIL Lamp on VIN: 1G2WK52J02
This vehicle misses on all 6 cyliners randomly, primarily on #2 under load. Mostly does it when its hot. A complete Tuneup was done, coil packs changed, Ignition Control Module, and a Crank sensor(24x). We are very much baffled with this vehicle. Any help woul... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Park Avenue Ultra 3.8L drivability VIN: 1G4CU5219X
We have not been successful in fixing this problem yet , but here is what we have learned from this experience. The problem is definetly not an engine missfire or torque converter shudder. We have determined that it has something to do with the supercharger. W...
1981 Cadillac DeVille 6.0L display VIN: 1GD6AD6999
thanks for the replies, the input was appreciated, but due to cost of parts and availability and the condition of the cadillac the customer decided to mess with it himself. i would of liked to of found a way to by pass everything and just light the display to ...
1988 Cadillac Eldorado 4.5L Liquid Crystal Display VIN: 1G6EL1156J
Thanks to all that sent in help. I notified all but one on the outcome.Sorry but I didn't have a name for the one I missed. I didn't have voltage on purple wire to information center( 50 volts) This voltage is generated in Instrument panal. I didn't have any L...
1985 Chevrolet C10 Custom 4.3L front brakes VIN: 1235V58J88
Thank you all for the wealth of information. I did replace the brake lines and I still had the same problem. I did as some of you mentioned and slowly unbolted the master cylinder and the brakes released. So I installed two washers as spacers and this took car...
1988 Chevrolet K2500 Cheyenne 5.0L excess exhaust temps VIN: 1GCDK24H8J
Well locating a torque converter stall speed specification proved to be a bit of an uncertain guess on many's behalf. Regardless of what we turned up with for a spec, the second we put this thing into a 'stall' state it showed us significantly low rpm indicati...
1996 Chevrolet Blazer 4.3L Steering VIN: 1GNDT13W6T
Thank you to those who replied all of you who said to check the idler arm adjustment were 100% correct it wasn't off much only 1/2 inch but it made a huge difference when I moved it up to where it was exactly level. I have never experienced this problem before...
1997 Chevrolet Blazer 4.3L speedometer VIN: 1GNDT13W3V
i had several replies and all said reprogram. i ordered a reman computer and programed it and all is good. thanks for all your help.
2003 Chevrolet Avalanche 1500 North Face 5.3L speedo VIN: 3GNEK13T53
Well Guys.. thanks for all the help, after several key cycles i got the speedo to reset.. Although I believe this may only be temporary its working great right now? Thanks to all..
1997 Geo Tracker 1.6L fuse VIN: 2NCB1867V6
As 1 reply said I volt dropped the ground side of all of the curciuts involved and found no problem at this time. 2 replies I recieved said try a larger fuse, so I put a 20 amp fuse in place of the 15 amp and the car has not blown it in a week. I did this wi...
1996 Pontiac Sunfire SE 2.2L Poor Idle Quality VIN: 3G2JB5246T
Thanks for all the reply's after tracing the wiring down to the computor, we decided to go with a computor, which fix all problems, thanks for all your imput Trouble codes: 108 (map baro press signal high), 172 (fuel system too rick 1), 1406 (egr pintl position ckt problem).
2001 Pontiac Grand Am GT 3.4L TCC Converter VIN: 1G2NW52E31
Thanks for the replies, and apologies for waiting to post the fix.. I wanted to make sure from the customer that it was truly fixed..The PCM flash/reprogram fixed the bug..Interesting to note that the TCC commanded duty cycle is based on many factors, and uses...
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