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Prev Professional Automotive Repair Technical Discussions for May 21, 2008
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Open Help Requests for GM
Help Request Answers
2002 Buick Rendezvous CX 3.4L ac compresor inop VIN: 3G5DA03EX2
can the u1016,u1040,witch appear to be ipc codes, have an effect on the ac?or the b2627,witch appears to be lighting, the only problems are no comp clutch,and erratic fuel gage,but disconnect battery and ac is ok for days or weeks, no ac codes!very intermitant...
2002 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP54K42
car was towed in by customer.she stated she parked car & came out next morning & no crank.we have car in the bay & it won't crank over. able to communicate with abs,climate control,dim modules but not with pcm.on dim module it shows key in proper position ( ke...
1998 Cadillac Eldorado ETC 4.6L cooling fans VIN: 1G6ET129WU
The system will not come on when switched is pressed on.The info. center say the A/C system need service.
1991 Chevrolet Lumina 3.1L Excessive Emissions, Poor Fuel Economy VIN: 2G1WL54T5M
im having a trouble with high co.. checked all the basics an dug further basically my o2 sensor wont move from .9 mv its new. fuel pressure is right on . wen the engine is at operating temp an in close loop no difrence, all gounds an powers to ecu ok..has anyo... Trouble codes: 45 (rich condition)
1999 Chevrolet Malibu 3.1L Cooling Systems VIN: 1G1ND52M6X
Vehicle came in overheating. We replaced the thermostat. Engine still overheats. The temp gauge would go 3/4 the way. Customer states the temp gauge has never gone pass half way mark until recently. We bleed the air out of the system and also replaced the rese...
2000 Chevrolet Impala 3.4L coolant level VIN: 2G1WF22E0Y
coolant level low message always on, 12 volts at yellow/black and ground at black wires, changed out 3 new ac delco sensors, no difference, flushed out green coolant and put in dex-cool, no change, if i disconnect sensor light goes out, cooling system clean no...
2001 Chevrolet Express 3500 5.7L No Start, MIL Lamp on VIN: 1GAHG39R11
this came in as no start - bad ignition coil- installed coil/spark plugs/ignition wires as there was multi misfire in computer. Vehicle will start but very very hard but runs fine once started.The only reliable way to start it is shoot a little 2+2 in intake t... Trouble codes: P0175, P0172, P0300, P0157, P1345
2001 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS19501
This truck came in with new plugs and wires, new O2 sensors, converter. Code. PO 420 converter efficiency. The truck runs and idles great, the front 02 looks good on the scope, the rear O2 stays below one volt and has intermittent spikes. I have never seen a r... Trouble codes: P0420
2002 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 3GNEK13T02
this customer came in saying-- i replaced engine and it is still "skipping",(used engine). i had felt the misfire, but had also found that the injector o-ring on the #1 cylinder was sucking air. the o-rings were recommended for replacement before going any fur... Trouble codes: P0300 (multiple cylinder misfire detected)
2004 Chevrolet Trailblazer LS 4.2L Transmission VIN: 1GNDS13S24
This vehicle has a vibration in Park and Neutral at about 1200 RPM. Also can be felt while driving up to about 2500RPM. Inspected mounts, no vibration at engine, but very noticable at trans mount area. Unbolted torque converter from flexplate, vibration 90% go...
1993 Geo Tracker LSi 1.6L No Start VIN: 2CNBI18UXP
I have a 93 geo tracker in the shop, The owner of the vehicle has attempted fixing it for the last few months and god only knows what he has messed up. I have checked mechanical timing, it is good. I checked to make sure the ingnition system was firing at the ...
1998 GMC Jimmy Envoy 4.3L o2 sensor bank 1 VIN: 1GKDT13W2W
Installed used motor runs and drives well. I keep gettin code P0135 witch is heated 02 fault bank 1 sensor 1. I believe im changing the correct sensor left up stream 02. I used a delphi sensor and a standard to be sure i didnt have a faulty unit. Is there a gr...
2002 Oldsmobile Silhouette Premiere 3.4L valve train? VIN: 1GHDV03E52
The customers complaint was that there was a ticking noise in his engine. He brought the car to my shop and left it. I went out about 5 minutes after he dropped it off and started it up...no noise. I turned it off and re-started about 5 minutes later and found...
1976 Other GM loadstar1700 404CID No Start, Hesitation, Misfire VIN: DO522FHA14
hey everyone; i know i'm streching this a bit but its worth a shot. the reason i used the gm is there is no option for ih or other; sorry what i'm looking for is a wiring diagram of the ignition circuit. here is the info on the truck i have; 1976 intern...
1997 Pontiac Grand Prix GT 3.8L Fuel Gauge VIN: 1G2WP52KXV
OK, This is my daughters car so I only get this for a little while when she comes home. Diagnosed a bad ignition switch due to the fact of the shift interlock problem with the blinking shift indicator light, etc. OK herein lies the problem, she just called me ...
1997 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5277V
Cleared codes and road tested with graphing scanner. O2 volts would not go below 300mv or above 700 mv while cruising but will go to 900mv under full throttle instantly and down below 100 mv on decel. Even on a high idle the range is narrow. P1133 returned on ... Trouble codes: P0133 (O2 signal response slow), P1133 (O2 B1S1 insufficient switching)
2001 Saturn SC2 1.9L fuse box VIN: 1G8ZY12731
i have a fuse box with bad contacts for fuel pump relay. Saturn says you can buy fuse box seperate. The exploded view looks like 2 main plug in from harness. Are the actual contacts in the box or are they in the harness connectors. Never had to do a late model...

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Park Avenue Ultra 3.8L Stall, start and stall VIN: 1G4CU53L0M
First let me thank everyone for the offered help. most of you felt it had something to do with the pass key situation. I followed the alldata testing to find the tamper switch activated in the trunk.The owner told me they had pryed the lock out so that is whe...
2000 Buick Century Limited 3.1L ac VIN: 2G4WY55J4Y
2002 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP54KX2
Thanks to everyone who replied to my nightmare. After looking at misfire data it was never consistently missing on the same cylinder i took a guess at the PCM and it fixed the problem. Thanks Jim Trouble codes: P0300.
1997 Cadillac Catera 3.0L high beam indicator/interior lighting VIN: W06VR52R7V
Thanks to everyone who offered help on this one.I had to go back to the wiring diagram to discover,that I was loosing power from the multi-function relay module(located behind the dash on the left A-pillar)Replacing the module was the fix.
2002 Cadillac DeVille 4.6L converter VIN: 1G6KD54YX2
Thanks so much for all the replies. We finally determined that the torque converter should be changed. This time a GM new instead of rebuilt was used and this solved the problem. This job required to much labor to risk a another possible bad rebuilt unit.I apo...
1990 Chevrolet Celebrity 3.1L MIL Lamp on VIN: 2G1AW84T2L
many thanks to all who responded, it was indeed the ecm, as i double checked power & grounds and many other things. i replaced the ecm and then had communication back with the scanner car runs well now and no more problems. thanks to all the tech,s that respon...
1993 Chevrolet Camaro 3.4L vaccum valve VIN: 2G1FP22S2P
Thanks for all the replies. The engine mounts were not broke so engine was not moving enough to break valve. Customer picked up vehicle and took to the dealer. I guess are diagnostics was just not fast enough for her. When she gets it fixed I will try to le...
1998 Chevrolet C1500 Suburban 5.7L vent tempature VIN: 3GNEC16R6X
It has been 3 weeks now and there is no problem to report with the suburbans A/C system.I had never seen a system get this cold.I am glad I had you too ask for advice.Many replies stated that If the system cycles before 20 psi and the lines do not freeze up th...
2003 Chevrolet Impala LS 3.8L cyl #2 VIN: 2G1WH52K73
well after reading all the replies... i tried a really good internal engine cleaner and the comp. dropped back down to 150bs, put a new spark plug in and gave it back to the customer and havent heard back from them... so i believe it is fixed... thanks for all...
2003 Chevrolet S10 4.3L Poor Idle Quality, Hesitation, Misfire VIN: 1GCCT19X23
The convertor was half clogged removed o2 sensor ran great thanks everybody for ur help..
2005 Chevrolet Blazer ZR2 4.3L loud clunk from transfer case area ? VIN: 1GNCT18X05
well, thanks to all 4 who relpied, good suggestions, have to make sure the right fluid has been used in the transfer case, I mentioned that the switch stopped working while I was testing the decoder motor, unhooked the battery for a minute and everything worke...
1997 Pontiac Grand Am SE 3.1L No Start, Stall VIN: 1G2NF52M9V
Well thanks everyone for your help and interest in my little problem. Charles helped the most with a phone # to call advanced auto electronics their # is 1 866 427 112. they agreed with me that the problem was with the dash module. They sent a rebuilt one out... Trouble codes: 1229.
1998 Pontiac Sunfire GT 2.4L lights on VIN: 1G2JD12TXW
Hi everyone Didnt get to many respones on this. But its all fixed. I did replace ebcm and it fixed it right up. Thanks for the help.
1995 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH5280S
replaced PCM with new unit, we were unable to pick-up DTC's with origional unit. As stated we only showed code 11 but were unable to pull any other codes. With new PCM we pulled a code 45. Checked the TRS and found a bad connection with B/W wire on the spade ... Trouble codes: 11 (PCM/TCM Codes Stored).
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