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Prev Professional Automotive Repair Technical Discussions for August 25, 2011
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Open Help Requests for GM
Help Request Answers
1987 Buick LeSabre Limited 3.8L poor cold start VIN: 1G4CX5132H
Hi all, this is for a VIP (aka bosses inlaw) the first thing many of you will think of is, does it have the right PROM, checked as per TSB and it does have a 1274 PROM ID, read via scanner. This beast either won't start or has long crank time and either splutt...
1998 Cadillac DeVille 4.6L compressor VIN: 1G6KD54Y8W
what i would like to know is the voltage range of the high and low side temperature sensors on the ac system. no imformation i can find tells me what voltages will cause the acm/ipc to lock out compressor operation, no scanner i can come up with comunicates wi...
1992 Chevrolet K1500 WT 5.7L spedo VIN: 1GCEK14K4N
Friend has no spedo opperation. He has replaced vss, spedometer, I diagnosed the speed buffer module and still doesnt work. Tested vss signal to buffer is good. But there is no signal being sent to PCM, or RWAL or spedometer? I suspect bad buffer was sent from...
1995 Chevrolet Blazer 4.3L Surge, Cuts out VIN: 1GCCT19W65
thanks in advance for taking the time to read this. i have a 95 s10 blazer with a w 4.3 engine.iam getting a real bad drivability problem on acceleration.it cuts out real bad, idles fine, starts great.the fuel trims are going very lean when it acts up.the fuel...
1999 Chevrolet K2500 Suburban 5.7L Atc Encoder Motor VIN: 1GNFK16R6X
Hello everyone, I am dealing with a 99 Suburban that came in with a complaint of a the wheels binding and grabing when turning and the service 4wd light on, put up on lift and found that the 4wd was lock in all the time. Scanned the transfer case and found c03...
2002 Chevrolet Silverado 1500 5.3L Transmission Case VIN: 1GCEK14V02
Hello, this truck is back with its 3rd transmission broken. The first trans broke about 80,000 miles and the input shaft broke. The 2nd trans broke at 161,[...] and the case broke inside. We then installed a 3rd one under warranty at 173,000 No we have the ...
2003 Chevrolet Blazer LS 4.3L No Start VIN: 1GNDT13W82
got an interesting one here. cust. brought to shop with crank no start, other tech checked and found battery dead. charged battery and car started right up. cust picked up and calls next morning with crank no start again. service run and checked for spark and ... Trouble codes: P0101 (Maf sensor)
2003 Chevrolet Silverado 1500 HD LS 6.0L Hesitation VIN: 1GCGK13U13
A few months ago the truck came in with a bad motor due to lack of oil. We replaced the engine with a reman engine supplied by the customer. Installation went smoothly and a crank variation relearn was completed. Customer picked up vehicle and returned next da... Trouble codes: P0336 (Crank sensor 18/24)
2004 Chevrolet Malibu LS 3.5L handling VIN: 1G1Z552F64
Good Evening Fellow Techs, I need some help with a 2004 Malibu with electronic steering(no codes). When you drive down the road and hit a small dip or any irregularity in the road, you loose positive control(squirley). With a one person driver, it's not very ...
2007 Chevrolet HHR LT 2.2L compressor VIN: 3GNDA23D47
hello,I have HHR that the a/c system cuts off right after the temp gauge in instrument cluster goes to zero,drivers info also says coolant ---. I ck sending unit for ohms, ck in specs,ck wires to PCM, ck wires from PCM to instrument cluster,with MODIS did a ga...
1997 GMC C1500 Sierra SL 5.0L brakes VIN: 1GTEC19M6V
This vehicle is driving us nuts,as you can see we have tried everything looking at previous fix data.the only thing left is the module,there are no fault codes for abs. when driving the pedal travels but stops the vehicle. when idyling the pedal goes to the f...
2001 GMC Savana 3500 5.7L power steering VIN: 1GDJG31RX1
This vehical belongs to a business and has been sitting for a couple years. The hyd power steering and hyd power brake niether work. Its full of fluid and everything turns ok. I'm alittle leary of just trying a new pump, becuase its about a $300.00 job to do t...
2002 GMC Envoy SLE 4.2L No Start, Cuts out VIN: 1GKDT13S72
Thank you everyone in advance for your replies. We have a 2002 GMC Envoy that will cut out on the customer. sometimes it will start afterwards, sometimes it will not. We have had this truck in our shop for a while and have not been able to recreate the problem... Trouble codes: P1514, P1345, P0335
1999 Pontiac Grand Am SE 3.4L Misfire, MIL Lamp on VIN: 1G2NE52E3X
Hope we can get some help. I'm helping a friend at his garage. this gran am is giving us fits. shows mis fire on # 4 cylinder only, will not show a code for#4 just po300. what has been done so far, compression 150, replace spark plug and wire, swapped injector... Trouble codes: P0300
2001 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NW52EX1
helping on of the other techs on this one. Vehicle is a crank/no start. fuel pressure is 55 psi. good spark. rpm signal when cranking. theft light comes on then goes off(normal). plugs are dry and there is no sound from injectors when listening w/stethoscope. ... Trouble codes: B3031
2003 Pontiac Aztek 3.4L Poor Idle Quality VIN: 3G7DA03E83
This vehicle came in 1 week ago complaing about overheating problem. Found that the thermostat was stuck closed replaced the thermostat and gasket and flushed out the cooling system. Upon test driving the vehicle something popped in the engine and the vehicle ...
2005 Pontiac Montana 3.4L Air Bag VIN: 1GMDV03EX5
This van shows code b1001 and the air bag light is on since the customer replaced his ipc. I know it needs to be programmed but am curious if the mdi can be used to program the proper serial number into the used ipc or do i need a tech2? thanks!

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Century Custom 3.1L Misfire VIN: 3GA4AG55M4
thank you everyone for your respond we found a bad connection at the Knock sensor, repair the harness customer return to said thank you Trouble codes: 325 (esc failure).
2002 Buick Park Avenue 3.8L rear shocks VIN: 1J4FJ6858R
Gentlemen I have the parts coming to fix this car. I went back to my NAPA store and ask them to call their tech line and find out what they recommened. It turns out when I first called, the NAPA guys said only air shocks were listed and there was a conversit...
1999 Chevrolet Malibu LS 3.1L anti-theft VIN: 1G1NE52MXX
Thanks for all your replies and a very special thanks to Marty. I bypassed pass-lock system with resistor and have sent down the road. Crossing my fingers, I will repost in awhile barring no re-occurences. Thanks again, I love this site.
2002 Chevrolet Avalanche 1500 Z71 5.3L tach- fuel gage only-ses lite will come on VIN: 3GNEK13T32
Hello, Finally got truck repaired. When I posted problem, stated all symptons started at the same time. I know GM has had cluster problems, speedo issues, gas gage issues, normally not cluster related. After BCM and cluster replacement, same problem with truck...
2006 Chevrolet Silverado 3500 WT 6.6L Blown head gaskets VIN: 1GBJC33232
Thanks for the advice especially about the trans possibly being ruined too,it is. We have now exceeded the value of the truck even though it is an 06. It's nice to know that when you need backup to convince someone of the proper way to do a repair that it is a...
2004 GMC Sierra 1500 4.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 2GTEK19V64
Upon removal of the driver side fuel rail and injectors, we inspected the #3 injector very closely and found scratches on the bottom of the injector. We saw no scratches on the other 3 injectors. We used our Snap On inspection camera and placed the wand down i... Trouble codes: P0300.
1963 Other GM Monza 900 145CID unknown VIN: 30927W1241
Hooray! I fixed it!! I actually get to post a repair. Most of the car owners that I ask for help with decide not to repair their cars if it's over $30. However, this car is different. I replaced all 4 wheel cylinders and brake hoses (The rear were a real ...
1999 Pontiac Grand Am SE 2.4L Cruise control VIN: 12NE52T2XM
after performing diagnostics on this vehicle and replacing pcm, discovered that the cruise control module was not working properly, customer did not want to fix, cannot guarantee this would solve our issue. (did replace the module originally with a used unit a...
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