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Prev Professional Automotive Repair Technical Discussions for January 22, 2009
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue 3.8L Accessories VIN: 1GM1543SD3
hey everyone ..i have this 98park avenue in the shop today it came in for power door locks inop...i have checked all the fuses and relays ect everything seems to be ok the locks still dont work i have scaneed the BCM for codes and found 2 codes in the history ...
2004 Buick Rainier CXL 4.2L transfer case VIN: 5GADT13554
suv belongs to boss's buddy. at 40mph all wheel drive and wrench light will come on. found code co374.when watching pids the front shaft speed is slower than the rear. tried rotating tires one side at a time which made no difference. tried switching speed sen...
1995 Cadillac DeVille 4.9L Excessive Emissions, Poor Fuel Economy VIN: 1G6KD52B0S
Vehicle is rich, O2 sensors read correctly (fixed .998v) and are new, LTFT 128 (fixed) both banks, STFT 128 (fixed)both banks . Fuel trim does not respond until I perform a reset with the Mastertech (output tests), Then the LTFT stays near 102-104, STFT varies... Trouble codes: E040
1999 Cadillac DeVille 4.6L Torque conveter lockup system VIN: 1G6KD54Y8X
I am looking for options for my customer. After performing as much of the diagnosis for the listed code i determined i would have to access the transmission to give a complete diagnostic and fix the torque converter clutch slipping issue. TSB's make me think t...
1999 Cadillac Catera 3.0L Misfire, MIL Lamp on VIN: W06VR522R8
Vehicle came in with very bad misfires, scanned and found multiple misfire codes as well as random misifire code. We checked spark plugs and replaced all. Checked coil outputs and found they were poor, relaced coils and vehicle ran good, returned to customer. ... Trouble codes: P0300, P0301, P0302, P0303, P0304
1988 Chevrolet Beretta 2.0L No Start, Poor Idle Quality VIN: 1G1LV1118J
thanks in advance got a wierd one here, car came in for high idle scanner showed tps,iac good pulled iac found to be very dirty, replaced with napa one, tps is new as well found no vaccum leaks, checked pcv grommets they are good, after we put the new iac in w...
1995 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GNDT13W4S
I have a 1995 chevrolet blazer that has a very poor idle and blows black smoke out of the tail pipe.the idle almost seems and smells like that of a blazer with a plugged egr valve (without the surging) the egr valve has been replaced by the customer.i removed ...
1995 Chevrolet S10 LS 4.3L No Start, backfire thru intake VIN: 1GCCS19W6S
Hello all, I have this 95 s10 that will not start. Vehicle has good compression, good spark, good fuel pressure, and timing is correct. Vehicle also has new timing chain, new crank sensor, new Map sensor, new wires, new spark plugs. Vehicle cranks over good an...
2000 Chevrolet K3500 7.4L transfercase 4470 VIN: 1GBJK34J0Y
For those that know the 4470 Transfer case with transfer case electro magnetic syncro sleeve. Problem is front driveshaft will not engage with transfer case when commanded. This is a manual floor shift transfer case with and logic timer relay. The logic relay ...
2004 Chevrolet Colorado 2.8L Charging VIN: 1GCCS14184
Hey all, this colorado is giving me a hard time. This is a parking enforcment vehicle for the local university. Vehicle came to us with an intermitant "Battery" light in the dash flashing on and off. Our inspection found the battery was low, but alternator cha...
2004 Chevrolet Suburban 1500 LS 5.3L radio and dic VIN: 1GNFK16T84
this truck has a problem with the radio controls in the steering wheel sometimes they will work fine and other time if you hit the volume the radio station will change, and other times the volume will go down when you push up, there are no codes in any system,...
2005 Chevrolet Astro 4.3L oil dip stick VIN: 1GCDM19X35
I have rubbed a spot on my head raw trying to figure out the deal. 2 oil services ago the dip was broken, so i fished out the pieces and replaced it. the next service it was broken again. as i looked closer the stick looked as if it was melted. as we studied i...
2005 Chevrolet Silverado 2500 HD 6.6L convertor VIN: 1GCHK23235
When driving at 50mph and then accel lightly, truck shudders. Shudder feels just like a convertor shudder but I'm only going off of past experiance with other trucks. Watched TCC apply on scanner TCM is applied at 96%, speed sensors all look good also. Owner s...
2005 Chevrolet Trailblazer LS 4.2L right axle VIN: 1GNDT13S25
Just wondering about what has caused the strippage of front right axle lock out on this Trailblazer with low low miles. The axle motor actuator works fine and scan shows it is locked. I can hear it strip when 4wd is engaged. I pulled the motor off the bearing ...
2005 Chevrolet Trailblazer EXT LS 4.2L Stall VIN: 1GNDS13S45
Hey you GM guru's. This came from a local bodyshop. Vehicle was hit in the rearend and battery was either disconnected or run down while at the bodyshop. Now that the repairs are done it runs okay but stalls upon decel coming to a stop. Just drive down the roa...
2006 Chevrolet Cobalt LS 2.2L MIL Lamp on, low power VIN: 1G1AK55FX6
This vehicle came in several weeks ago with several codes as well as reduced power message displayed on the instrument cluster. Brought vehicle in and test drove ran perfect but I pulled codes p1516,p2176,p2119,p2431. Cleared codes test drove codes didnt retur... Trouble codes: P1516, P2119, P2431, P2176
2007 Chevrolet Cobalt LS 2.2L trans cooler line VIN: 1G1A55FO77
a true trans level check and location of oil level plug
2002 GMC Sierra 1500 SL 5.3L Hesitation, Cuts out, MIL Lamp on VIN: 2GTEK19T32
thank you ahead of time for your help i got a 02 sierra here witha running issue when you step on gas it falls on its face and cant get outa its own way maf has been replaced,all 4 o2s replaced, 02 switch fine untill you give it gas and then truck boggs down e... Trouble codes: P0171 (system to lean bank 1), P0174 (system to lean bank 2), P1133 (02s circuit insufficient switching bank 1 sensor 1), P1153 (02s circuit insufficient switching bank 2 sensor 1)
2005 GMC W5500 5.2L No Start VIN: J8DE5B1635
Hello, We have a 2005 GMC w5500 that has no glow plug operation. The relay has power from the black/ blue wire from the 60A fuse, power from the black/yellow wire from the small 25A fuse but no ground. According to my diagram, the ground comes from the ECM via...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Park Avenue 3.8L Unknown VIN: 1G4CW52KOV
first of all let me start by saying thanks to all that replied. and as all of you stated the problem was the upper intake.removed the throttle body as stated and notice hole in plenum so replace plenum and spark plugs from local auto parts store and car is ru...
1990 Chevrolet Lumina Euro 3.1L Stall VIN: 2G1WN54T8L
Thanks to all who took the time to respond. We have had no precipitation in our area lately so I am currently applying controlled moisture an area at a time trying to reproduce the symptoms (with no luck so far). Sorry I have no fix to pass along yet.
1991 Chevrolet Cavalier RS 2.2L shifting in cold weather VIN: 1G1JC14GXM
Well since I recieved car from former GM tech I am sure he used synchromesh fluid ,plus finding reciepts too. I have determined it is freeezing the shifter cable, or it would freeze after starting not sitting over night. Since the cables are nearly 300 dollar...
1996 Chevrolet Tahoe 5.7L No Start VIN: R3TJ340121
you guys were right on. we cleaned the intake very well and yes we made the injectors stop working. the customer had asked us to realy clean everything and we did. i ordered a new assembly from ac delco and it runs like a new car. many thanks dan
1999 Chevrolet Tahoe 5.7L transfer case VIN: 3GNEK18R5X
Thanks very much for the excellant advice in the 15 responces I got to this request. Especially Cor, Gary, David and Henry who nailed the problem. The chain in the transfer case was stretched and would jump a tooth uner load. When we laid the new chain aside o...
2000 Chevrolet Astro 4.3L Misfire, MIL Lamp on VIN: 1GNEL19W6Y
too bizare--remember that putting new distributor gear repaired roughness at idle---found that off idle no spark to cyls 2 and 3. the electrodes in the distributor were next to each other--removed new cap and found that cap was burned through to cyl 5 exactly ... Trouble codes: P0300 (random misfire).
2001 Chevrolet Express 3500 5.7L Stall VIN: 1GAHG39R51
I appreciate everyone's help on this one. It is going to go to the dealer. I did get it to stall on me once but it didn't help me. The problem was really a lack of technical info. As I mentioned the customer is a friend so I will update ya'll on this one i...
2002 Chevrolet Suburban 2500 LS 8.1L No Start VIN: 3GNGK26G52
thanks to everyone for all the advice, most were on the same page as me so any words were greatly appreciated. dropped the tranny out of the way which allowed for much more space to work, picked the o-ring out and tried to get a bite with some sheet metal scre...
2006 Chevrolet Avalanche 1500 LS 5.3L abs pump VIN: 3GNEC13T32
Thanks to all who replied. After trying 2 used assemblys and still having the problem. I sent the oe module to bba.reman and they rebuilt it. works fine now. It was only cost $100 to fix. Special thanks to Bob from wisconsion for giving this information. Y...
1998 GMC Sonoma SL 2.2L MIL Lamp on VIN: 1GTCS1447W
Thanks to all that replied. I finally have this one repaired. I started out by checking the fuses and power and grounds to the computer again. Still the battery light was on and the temp and fuel guages didn't work. Then I realized that the PCM had to b...
2002 GMC Savana 3500 6.5L Excessive Emissions, Poor Idle Quality, Surge, Cuts out, Misfire VIN: 1GDJG31F72
Thanks to those who took the time to reply to this help request. I really wish I had some good information to share but of the few replies I received only a couple tried to address the timing issue. The rest were for the boost code which is not what I was aski... Trouble codes: P0238 (Boost sensor circuit).
2000 Pontiac Montana 3.4L heater VIN: 1GMDX03E2Y
We heard many helpful hints on the problems these vehicles have with poor and intermittent heat. We went ahead and flushed the heater core before doing anymore diagnosing and it fixed the complaint.Not the usual symptoms of a plugged core but we learned!Gettin...
2000 Pontiac Grand Prix SE 3.8L starts and dies VIN: 1G2WJ52K5Y
Greetings, techs. We have fixed this Pontiac. Most everyone said the theft deterrant module would be the culprit. They were right. We were not able to get a new module, so we had to use the theft module we got from the salvage yard. It was suggested that a use... Trouble codes: B2960.
2002 Pontiac Grand Am GT 3.4L hazard flasher VIN: 1G2NW52E72
hi, most of you thought it was the turn signal switch, it was a students car and she has gone back to school out of town, so not sure when i'll see the car again, but made note on the ticket to try a turn signal switch, thanks for all the help
2002 Saturn L300 3.0L Hesitation, Surge, MIL Lamp on VIN: 1G8JW54R82
Thanks to everyone who took time out of there day. Tim, William and Walter hit the nail on the head with the cat. I was over looking the cat because of the fact that the car ran so much better with the mass unpluged.After reading your post i thought why not ... Trouble codes: P0102.
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