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Prev Professional Automotive Repair Technical Discussions for August 12, 2010
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Open Help Requests for GM
Help Request Answers
1995 Cadillac DeVille Concours 4.6L compressor VIN: 1G6KF52Y6S
1995 deville ac inop, after testing via wiring diagram from on demand found that there is no ground at the micro clutch control relay under hood. According to the diagram it gets its ground from the PCM pin 3e15, i have no grond at that pin of PCM. My question...
2000 Cadillac DeVille 4.6L hvac VIN: 1GEEH90Y0Y
this is a funeral home limo and they say they have always had ac trouble with this car but the ac is not no where near as cold as it is on the pass side it is still on but not as cold but sometimes it will start working correctly and then get slightly warmer a...
1983 Chevrolet C10 Custom 5.7L Hesitation VIN: 2GCEC14H20
We replaced the engine with what he brought in, we used the original intake, at first with, original rochester carb, tried to get it all set up, and could not get more than 14-15" of vac and base timing ranged from 55-[...]. We have tried to adjust timing ...
1997 Chevrolet Corvette 5.7L Hesitation, Surge VIN: 1G1YY22G7V
Customer came in with MIL on and I found the above error. But, this error is accompanied with a slight loss of power and acceleration. Afterward, the power rolls on so fast it feels like a surge. I carefully examined the datastream and nothing pops out at me. ... Trouble codes: P332
1998 Chevrolet Tahoe 5.7L Stall VIN: 1GNEK13ROX
what ive got is this thing will run in our shop for about an hour then just quite.. runs good when running. noticed fuel pressure will keep steady at 55psi the it will just drop to 45 psi then shut down about 1.5 seconds later, then start back up after about 1...
2000 Chevrolet C3500 7.4L Stall VIN: 1GBKC34J6Y
I have a work truck with a fuel issue. No codes at this time- had a TPS code but is fixed now. The pump will wine in a rythmic, pulsing tone going up and down almost as often as a turn signal flasher would. When it does this the pressure goes from 50 (normal) ...
2000 Chevrolet Express 3500 7.4L Axle Seal VIN: 1GBJG31J8Y
Hey guys, I have a 2000 3500 chevy van here with dual rear wheels (mini bus)and it has a reoccouring problem with the right rear axle seal. The differencial was replaced about 2 years ago with a used unit. I know it sounds elementry but we have put 2 or 3 seal...
2001 Chevrolet S10 4.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1GCCT19WX1
This S-10 is beating me up bad! Customer complaint is a shake at highway speeds. After rotating and balancing 4 JUNK BFG All terrains and replacing a smoked wheel bearing I am then told the shaking is intermittent at highway speeds under slight load and accomp... Trouble codes: P0300 (Random Missfire)
2001 Chevrolet Express 3500 5.7L No Start, Hesitation VIN: 1GCHG39R11
This veh came in with a "bog down" problem like not getting enough fuel.trans will downshift and then wot does not want to accelerate. No codes, and an intermittant condition. Periodically when hot will crank and not start. Does anyone know if the oil pressure...
2002 Chevrolet Trailblazer LT 4.2L Differential VIN: 1GNDT13S52
Helo all got somthing wev never seen befor 2002 chevy trailblazer 4.2L automatic need to replace timing chain so far have taken apart the whole front of the vehicle acording to motor alldata now we are down to the differential and it will not seperate from the...
2003 Chevrolet Trailblazer LT 4.2L Poor Idle Quality, Stall, MIL Lamp on VIN: 1GNDT13S23
This trailblazer idles at about 400 RPM and eventually just stalls. But you have to have the A/C on to create this problem, if the A/C is off it will idle fine. I replaced the fan clutch and wiring harness for the P1481 code and also the coolant temp sensor. T... Trouble codes: 1481 (Cooling fan speed sensor)
2004 Chevrolet Avalanche 1500 5.3L No Start, MIL Lamp on VIN: 3GNEK12T24
This truck will not start sometimes after sitting for 30 min or so.It turns over fine.We replaced ign switch because we had to wiggle the key switch or turn it back slightly to get truck to stop turning over.This is fine know.You try to start and it will turn ...
2007 Chevrolet Avalanche LTZ 5.3L fuel gauge VIN: 3GNEC12047
greetings to the group , Fuel gauge inop, replaced fuel pump for low pressure , slow to start , no start , no problem truck cranks right up now.There seems to be some confusion about when the no gauge first appeared , naturally the customer didnt notice until ...
1994 GMC Sonoma SLS 4.3L Hesitation, Surge, Cuts out VIN: 1GTDT19W9R
Well, I hate this truck. No Codes. Recently started cutting out, hesitating, surging between 2000-2500 RPM. Idles great, starts out great until hits 2000 RPM then will surge, and stumble until you get past 2500 RPM. If you just romp on it from the start it is ...
1998 GMC Jimmy SLE 4.3L Ign key return VIN: 1GKDT13W6W
The problem is the ign key won't relax after you start the truck. The starter stays running until you turn the switch back your self. We have pulled the column apart tried a new switch and steering wheel lock module and no change to the problem. Does any one k...
2001 GMC Safari SLE 4.3L No Start, Stall VIN: 1GKEL19W11
The vehicle initially went into another shop for a no start, where the distributor was replaced due to play in the shaft. Then the vehicle would start but immediately die. This is where I got the vehicle. The codes were cleared, and none are current. I can r...
2002 GMC Sierra 2500 HD 6.6L Shift Solenoid D VIN: 1GTHK23192
Truck seems to go into neutral under load at around 80kph at or near full throttle. Scan data showing gear selected "5" and desired/actual gear at "0" when condition occurs. Truck originally came in with a p0845 after a Trans service at Dealer. We found a TSB ...
1999 Oldsmobile Aurora 4.0L Steering VIN: 1G3GR62C3X
Customer brought in car said it was not turning left. I test drove and confirmed this to be correct. Turns right normal but not left. Installed power steering pressure test gauge directly on pump and found that while turning right pressure is 800 to 1100 psi w...
2006 Pontiac Montana SV6 3.5L Ebcm VIN: 1GMDV03L86
This vehicle has 3 ABS codes: C0111 C0115 C0120 If you clear the code with engine running the codes come back right away. If you clear the codes with engine off the codes go away until you go for a drive. Inspected all sensors, all good. Thanks in advance.

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Rendezvous CXL 3.4L Low oil pressure VIN: 3G5DB03EX2
Thanks to all that replied. The oil pump replacement fixed about half the problem (meaning the low oil light went on about half as much) We found out from our local dealer that this is a problem on this vehicle and to add an extra 1/2 quart of oil. What reall...
1996 Chevrolet Cavalier 2.2L Abs Motor Pack VIN: 1G1JC1245T
thanks to all that replyed. justin from alabama and randy both had it right. the bad is that the customer was not willing to leave the car for repairs. how ever when i clear the code the car worked normaly for a few blocks till the evap code returned, the ets ...
1998 Chevrolet C1500 Suburban 5.7L Cuts out, Misfire VIN: 3GNFK16R3W
Sorry this took so long. Customer doesn't really need this vehicle so it was back burnered and i dealt with it as I had time. Finally fixed. I did install a new distributor that got my cap alignment where I expected it to be but problem still there. I was able...
1999 Chevrolet Express 3500 6.5L Cooling Systems VIN: 1G6HG39FOX
Well,I did find a fluid for diesel engines,it is a red fluid,however it still didn't change color.I was sure enough about it to go ahead and tear it down.Once I got the coolant crossover removed I started the engine and I could see alot of bubbles coming from ...
2000 Chevrolet Blazer LS 4.3L No Start VIN: 1GNCT18W5Y
Thanks guys. Most of you are right on. I had 55 pounds of fuel pump pressure and good volume. I made a mistake by assuming that this was enough pressure. I did what I should have done after I read some of the posts. I checked the specifications and it cal...
2002 Chevrolet Silverado 2500 HD 6.6L Engine VIN: 1GCHK23152
ok guys thanks everyone for helping me out here. We swapped converters yesterday and that was the fix i know that everything was pointing in that direction it was just hard for me to condem such an exspensive part. this converter had been getting so hot from d...
2002 Chevrolet Express 3500 6.5L Poor Idle Quality, Surge VIN: 1GBJG31F52
first off I would like to thank everyone that responded.Tim was dead on with the pump mounted driver being bad.After further research I was able to determan the PMD was bad by using a lab scope and checking the signal from the PMD to the fuel solenoid on the r...
2002 Chevrolet Corvette 5.7L compressor clutch VIN: 1G1YY32G32
Call this one fixed! Found terminal in underhood fuse box a/c clutch relay burnt up. Repaired terminal and all is well. Thanks for the help! David
2003 Chevrolet Corvette 5.7L Cuts out, Stall VIN: 1G1YY12S73
Thank you to all that responded. After searching information, found the GM recall for the steering wheel lock system that sguts down the vehicles injectors after moving forwards, or backwards. The customer took the vehicle to the dealer to have the update perf... Trouble codes: C1214, C1221, C1222, C1248, C1277, C1287.
1991 GMC C1500 Sierra 5.7L Excessive Emissions VIN: 1GTEC14K6M
The vehicle does have a few exhaust leaks. Thats why the o2 is elevated. The prom had a update from the dealer. problem solved.
1928 Other GM 302 302CID Camshaft
2000 Pontiac Sunfire SE 2.2L tcc VIN: 1G2JB1242Y
Hi Guys. Thanks for all your help.We finally found the correct engine harness with 3 speed trans.Installed and everything is perfect.Really appreciate all your help.
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