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Prev Professional Automotive Repair Technical Discussions for September 29, 2005
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Limited 3.8L control head VIN: 1G4HR52L0R
If you set the temp Iin the middle it will either go full hot or full cold by it self. Then you reset and it will work for awhile and then start doing it again.
1994 Buick LeSabre Limited 3.8L MIL Lamp on VIN: 1G4HR52L6R
I need some help. I have the car that is setting knock sensor code while the KOEO, this happens about one min. after I clear the codes. I have a good connection at the knock sensor W/ 2.46 volts measured at the ECM and 5Volts when disconnected. When the code s... Trouble codes: P0325
1997 Buick LeSabre Limited 3.8L Accessories VIN: 1G4HR52K2V
Hello everyone we have this 97 Lesabre that has content theft that seems to go off in the evening when it cools down. We have disabled the trunk switch and replaced the main security module to no avail. It doesn't ever seem to go off during the day only when i...
1995 Cadillac DeVille 4.9L Hesitation, Cuts out VIN: 1G6KD52B4S
I'm glad I've shaved my head. This will be the second time trying to pull it out.. This Deville will drop 4 injectors about 2000 rpm in gear, forward or reverse. I have ohmed the injectors all have 15 resistance. With the key on all have the same voltage comi...
1995 Cadillac DeVille 4.9L radio,wipers VIN: 1G6KD52B05
Car came in with customer complaint of the battery runs down while setting. He then said that the radio and wipers come on by them selves after getting out of the car. Open the door and they stay on till you shut the door, they go off and it goes thru it again...
1998 Chevrolet C1500 Cheyenne 4.3L Misfire VIN: 1GTEC19W5Q
hi techs this chevy is a strange one. it works perfect most of the time. some time underload in will multi misfire and most times it was #3 cyl. replaced spark plugs after trying a new coil and wire. costomer returned after replacing plugs and said it still ru...
2000 Chevrolet Suburban 1500 LT 5.3L Cuts out, Misfire, MIL Lamp on VIN: 3GNFK16T6Y
The truck came in 1 month ago with after failing the emissions test due to code: P0420 - low cat efficiency bank 1 - after testing and replacing the catalytic converter and both oxygen sensors (front & rear) on bank 1 the code P0420 low cat efficiency returns ... Trouble codes: P0420 (Catalyst efficiency bank 1), P0300 (multiple cylinder misfire)
2001 Chevrolet Impala 3.4L instrument cluster VIN: 2G1WF52E91
vehicle came in with odometer reading all "8's", battery light on, brake warning light on,seat belt light on. It acts like the instrument panel is unable to do it's self test. You can get odometer reading with key off and pushing trip reset button. When you tu...
2003 Chevrolet Suburban 1500 LS 5.3L speedometer VIN: 3GNFK16Z43
Thanks in advance for your help, iatn is a great resource. The customer states the speedo sometimes sticks at 40mph and sometimes drops to 0 and stays there, of course it did not act up when I had it. But the needle jerks all the way up and down. I scanned the...
1995 Oldsmobile Silhouette 3.8L Misfire VIN: 1GHDU6L9RJ
van under load has bad miss. Cust has replace plugs with bosch platnum and we have scoped engine and found nothing. Scan data shows all sensors in parameters except shows voltage above what is on dvom at batt. @ 15.6 on scnner and 14.3 on batt. batt guage fluc...
1995 Oldsmobile Achieva S 2.3L chassis VIN: 1G3NL55D45
Owner requested engine R&I (wanted a NEW Quad Four; go figure); we can hear a humming/vibration when the steering wheel is cranked all the way to the right and the humming/vibration is WORSE when the vehicle is under acceleration in a hard right turn. OF COURS...
1998 Oldsmobile Aurora 4.0L lifters VIN: 1G3GR62C3W
Vehicle came in for blown headgaskets. Replaced head gaskets and repaired all the head bolt threads with the GM timesert kit. After repair vehicle ran beautifully, but had a lifter tick. Replaced all lifters. Now I have low compression in all cylinders like li...
2001 Oldsmobile Intrigue GX 3.5L head gaskets VIN: 1G3WH52H41
We are replacing the head gaskets on this Intrigue 3.5L. You need 2 special tools to set the cams,with the primary and secondary timing chains, the GM #'S are J42042 and J42038. We have had no success finding these tools, they are made by Kentmore, who told us...
1967 Pontiac GTO 428CID TH400 tail bushing
Installing customer's GearVendors overdrive unit behind TH400. Speedo drive is relocated to back of OD unit (nice kit). Should a speedo driven gear be kept in trans for splash lubrication of tail bushing or can speedo drive be removed & sealed with a core/free...
1996 Pontiac Firebird 3.8L Misfire, MIL Lamp on VIN: 2G2FS22K3T
Car came in with check eng light on and missing. Pulled codes and got a p0300 went to missfire counter and cyl number 5 was missing constant. The history said all cyl had missed.Run compression check on cyl 5 and it was 150 lbs. Checked for spark and it was go... Trouble codes: 300 (multi cyl missfire)
1996 Pontiac Grand Am SE 3.1L Transmission VIN: 1G2NE52M7T
Customer came in with all of the same codes returned. I checked the ERLS fuse and found it blown. I repaced the fuse, it blew right away. I checked alldata and checked all of the wiring for any possible signs of a short. I have tried unpugging each one of the ...
1998 Pontiac Trans Sport Montana 3.4L abs tcs VIN: 1GMDX03EXW
Vehicle came in with ABS, TCS (traction control) and red brake light on. Scanned abs/tcs module and a list of codes came up cleared codes then lost communication with module. So I replaced abs/tcs module and everything was fine. Came back a week or so later wi...
1992 Saturn SL1 1.9L MIL Lamp on VIN: 97NZ183144
Hello Saturn techs.I am looking for some info on this Saturn.Customer from out of town and did not have time to get deep into idle trouble.Told him I would check with you guys before proceeding.IAC counts on scanner are at zero and desired and actual idle rpm ... Trouble codes: 35 (idle speed error), 49 (idle spped error)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52L6R
Thank you all that responded to this. After reading the responsesfrom all and a couple of more hours diag time I recommended that we replace the ecm. I told the customer that I was 90% sure that was it. They finall ok'd the job yesterday. ecm solved it.
1997 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52K2V
Thanks for all the replies. It took awhile to post a fix due to the fact that we wanted to be sure the vehicle was repaired. We ended up cleaning the battery posts and cable ends, there was lots of corrosion in between the cable and the battery that you coul... Trouble codes: P0446 (evap system canister vent blocked).
1970 Cadillac De Ville 472CID Alt Light
I had some good suggestions, the 1 wire alternator is simple, but that wouldn't take care of the warning light(which the customer wanted to work properly).What was happening is that the alt light would glow with the key on and nothing plugged in! I found that ...
1996 Cadillac Seville SLS 4.6L Illumination lights VIN: 1G6KS52Y6T
Sincere Thanks to Dan from Texas & Glen from New Jersey, their input help greatly in understanding circuit operation and proper diagnosis. The culprit was indeed the Headlight Switch. Its always the simple things that seem to send us off in the wrong direction...
1997 Cadillac DeVille 4.6L Cuts out VIN: 1GTDC14Z6P
so far so good we installed a set of denso iridium plugs and standard brand wires. no miss and runs fine. checked for bad head gaskets and found none. this car had the inserts installed in the block last year. only some miles put on the car will tell . gino Trouble codes: 300 (mult cyl missfire).
2000 Cadillac HEARSE 4.6L Air Bag warning VIN: 1GEEH90YXY
Hello and Thank you to all that replied. We tried every new suggestion, flashing theft detterent, retrying tech2 and nothing helped. So my boss ordered up another new SDM we plugged it in and hooked up tech2 and this time it worked without any faults or proble...
2001 Cadillac DeVille DTS 4.6L traction control VIN: 1G6KF57991
Thanks to all tech for your time.I was unable to get a fix on the car because the customer did not whan't to spend the $$.I suspected the ebtcm as the problem because I cut the white wire comeing from the brake light switch right at the ebtcm connector and onl...
2001 Chevrolet Suburban 2500 6.0L tech2 connection to the car VIN: 3GNGK26U6Y
we found out in tech 2.that communication was missing whith SDM.trough messurements that SDM module under driver seat was sought in water.Replace is nessesery.all wirirng is ok.
1997 Oldsmobile LSS 3.8L dash lites VIN: 1G3HY5211V
four replies received on this all pointed to bad ground ,that was part of the problem . repaired ground to the instrument panel dimming module ,now dash lites worked intermitently .removed plug from dimming module and crimped connectors in plug to improve the ...
2001 Pontiac Sunfire SE 2.2L No Start VIN: 3G2JB12461
First of all THANKS TO ALL WHO REPLIED ! Evrey one that said to check the connector on the short harness that plugs into the sending unit (fuel modual) had the right idea . I had changed the pump as a unit with the sender both times so the problem wasn't in th...
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