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Prev Professional Automotive Repair Technical Discussions for June 8, 2004
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Open Help Requests for GM
Help Request Answers
1990 Buick Century Custom 3.3L No Start, Hesitation, Stall VIN: 1G4AH54N4L
Elderly lady had vehicle towed to us after her 90 Buick Century with a 3.3L died on her. Good spark and fuel pressure at all times. Car will somtimes start but die when throttle is touched, at that time it loses injector pulse. Checked combination cam/crank se...
1993 Buick LeSabre Custom 3.8L a/c vents VIN: 1G4HP53L6P
This buick has no air flow out of face vents, but defrost and floor work normally. While in Max or Norm position air blows from defrost only. In Bi-level air blows from floor and defrost. I have replaced the solenoid vacumn switch which got me vents for the fi...
1987 Cadillac Fleetwood 4.1L Speedometer VIN: 1G6CB518XH
Vehicle came in with inop. digital speedo. tested and found vss was ok on scanner. had 5 volt square wave out of buffer to cluster. Consulted identifix and was agreed to send in cluster to local GM dealer to have repaired. reinstalled cluster, put back togethe...
1991 Cadillac Eldorado 4.9L Wheel speed sensors VIN: 1G6EL13B4M
I havn't had alot of experiance with Cadillac and don't have access to the pinout box the diag. flow chart calls for. Any Ideas would be great.
1991 Chevrolet Cavalier RS 3.1L daytime running lights VIN: 1G1JC11T9M
I am working on a 1991 chevy cavalier in which the daytime running lights are pulsating dimmer and brighter. The feed wire to the bulbs is going from 8 volts to 13.78 volts.We have checked for voltage drops and power supplies good. We have replaced the module ...
1992 Chevrolet K1500 Cheyenne 5.7L No Start, Excessive cranking VIN: 2GTEK19K5N
When cold engine starts and runs fine, the problem occurs only when hot. When restarting at normal operating temp, there is no injector pulse or spark for about 3-5 seconds. Usually after about 8-10 seconds of cranking the injectors pulse and the coil begins t...
1995 Chevrolet Astro 4.3L refrigerant loss VIN: 1GNDM19Z1R
original problem refrigerant loss.detected leak in evaporator. replaced evaporator. return after 3 days and evaporator replaced again,no other leak detected. when charged added dye to system,also replaced low pressure sw due to slight dye detection and high pr...
1995 Chevrolet Camaro 3.4L Poor Idle Quality, Cuts out, Stall, Misfire VIN: 2G1FPZ2S60
car is back now with same type of problem . on cold start will misfire ,backfire ,stumble ,idles horrible for about 5 minuets. once vehicle warm will run and idle fine. no codes in computer - replace #3/6 coil scope looked like bad pattern with those cylinders...
1995 Chevrolet Blazer 4.3L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1GNCT18W8S
Hello. This goes out to all the indi-shops. I am looking for an aftermarket EGR gasket which incorporates a screen over the EGR ports. I cannot find it anywhere. If you have a part # and name of company, please send it to me. Thanks. Trouble codes: 32 (egr)
1997 Chevrolet S10 2.2L Misfire, MIL Lamp on VIN: IGCCS1942V
help misfire mania. this truck will misfire or skip badly on accelaration some times. may drive truck 40 or 50 miles with out doing. will misfire,skip,buck and backfire in exhaust 3 to 6 times and go back to running good. may set a code may not. with scanner h... Trouble codes: P0300 (random misfire), P0303
1999 Chevrolet Blazer 4.3L Poor Idle Quality, Hesitation, Misfire VIN: 1GNDT13W9X
car stumbles at off idle esp. when not fully warmed up no trouble codes new plugs cap rotor and ign wires scoped ing. with tester and seems normal i think it is fuel injector related thanks mark
2002 Chevrolet Trailblazer LS 4.2L No Start VIN: 1GNDT13552
Heres the story.First vehicle came in with no tranny shifting(in default).Pulled codes found 5.Checked ATN Historys found common ignition switch problem. So I replaced switch and now codes are gone but now will not turn over or start And has no codes in ecm bu... Trouble codes: P0740 (CC Clutch problem), P0753 (Shift a prob.), P0758 (Shft b prob), P0785 (p1860-), P1860, U1000 (Communication problem between modules)
2003 Chevrolet Trailblazer LTZ 4.2L MIL Lamp on VIN: 1GNDS13S13
The security light will come on when you are driving down the road. Some times it will come on after driving 5 to 10 miles or when you when you first take off. The check engine light does not come on but i checked it with TECHII and i get code U1064 pcm loss c... Trouble codes: U1064 (PCM loss of communication with BCM)
2003 Chevrolet c3500 6.6L MIL Lamp on VIN: 1GTHC24113
Hello everyone. I have a 2003 Chev 6.6 litre diesel with the check engine light on. It has a code 404 EGR performance problem code. I've cleared it out once and thought is was just a fluke. It came back on a week later. Has anyone ran across on a 6.6 diesels? ... Trouble codes: 404 (EGR performance problem)
1997 Geo Tracker 1.6L MIL Lamp on VIN: 2CNBJ1364V
Hello I have a repeat p0400 egr fault.I have not yet replaced anything yet.I have found and followed G.M bullitian # 00-06-04-027 to no avail.I have also followed published diag. from gm si 2000.The system seems to be working properly but code keeps coming b... Trouble codes: P0400
1997 Oldsmobile Silhouette 3.4L Misfire, MIL Lamp on VIN: 1GHDX06E3V
Hi Fellow Techs, This is a good one. Vehicle came in with MIL lamp on solid, customer stated lamp blinked a couple of times after starting. Customer informed the shop that vehicle has not been serviced for engine tune-up since it was new. Trouble code P0300 wa... Trouble codes: P0300 (Multiple Misfire)
1997 Oldsmobile Cutlass GLS 3.1L No Start, Poor Idle Quality, Misfire VIN: 1G3NG52M1V
This vehicle came to us with a no-start condition. The battery was dead, we replaced and new terminal ends. Cranked, no start. No codes immediately present (of course battery had been dead for a while). Replaced Bosh plugs with Delco Plantinumís, new fuel filt... Trouble codes: P0300 (random misfire)
1996 Pontiac Grand Am SE 2.4L Starting VIN: 1G2NE12T2T
car dies with in seconds after being started. the computer conded was p1629. replace cyl. lock and key ing. tried to relearned password, did not help.
1997 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52K9V
replaced motor, 3 weeks later car comes in with p0401-insuficiant egr flow. visually checked all passages, worked egr valve with bi directional, all seemed normal. wrote problem off to chuck of carbon. next week car is back-same code. checked all passages and ... Trouble codes: P0401 (insuficiant egr flow)
1997 Pontiac Grand Prix GTP 3.8L Stall VIN: 1G2WP1214V
fuel pump will entergize with key on but as soon as you start it it will turn off and die, owner swaped pcm,i tryed swapping ign module and relays, no luck. using snap on scanner it is showing cranking rpm and somtime car will stay running if you feather the g...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick LeSabre Custom 3.8L No Start, MIL Lamp on VIN: 1G4HP53L8N
I have got this car fixed. I had a new crank sesor that went bad, It had a glitch that happened vary fast. I just sat and looked at the signal when cranking and found the glitch THANKS FOR ALL THE HELP YOU GAVE ME THIS IS THE FRIST TIME I USED IANT Trouble codes: 41 (cam sensor).
1993 Chevrolet K1500 Suburban Silverado 5.7L axle seal VIN: 1GNFK16K5P
Thank all of you for the help. I am going to replace the bearing and seal as per most of replies.I will check the vent for blockage as some of you have mentioned. Thanx again. Ron
1997 Chevrolet Express 1500 5.7L Hesitation, Surge, Cuts out, Speedometer VIN: 1GBFG15R4V
Sorry about the long delay. The book is not closed on this one yet. Problem disappeared. Owner had some type of extended warranty at the dealer and returned there to attempt to correct. Dealer had the van for a week and drove it for more than a 100 miles with ...
1998 Chevrolet Tahoe LS 5.7L Poor Idle Quality, Cuts out, Misfire VIN: 1GNEK13R7W
Greetings to all. We are still working on this problem and thus have not closed until the final moment, hoping to nail it down. Our service advisor has been driving the truck back and forth to work as the owner has lots of cars and will not drive this one unti...
2001 Chevrolet S10 4.3L Cuts out, Misfire, MIL Lamp on VIN: 1GCCS19W91
Hi again...I wanted to wait and make sure this vehicle was fixed. I found the cam retard at -8 degrees at idle and read about other guys wallowing out the distributor hold down bracket to allow a change to 0 degrees. I did this and this vehicle has not been ba... Trouble codes: P0300.
2001 Oldsmobile Aurora 3.5L trunk lid VIN: 1G3GR64H21
The fix was to move the torsion bars/rods down one notch. There was no evidence of rear body damage, and a recent CarFax backs this up (this car is a recent purchase). The stops seemed to be fine too. I used a 6' 3/8' extension and deep 10mm socket to reli...
1996 Pontiac Grand Am SE 3.1L MIL Lamp on VIN: 1G2NE52M5T
Thanks for the replies- The majority of the posts mentioned checking O2 sensor grounds. We checked and tightened those- others mention along with bulletin from GM about injectors getting dirty. We cleaned injectors and are going to let customer have the car an... Trouble codes: P0134 (Front O2 sensor no activity), P0140 (Rear O2 sensor no activity).
2002 Pontiac Grand Prix GT 3.8L upper intake VIN: 1G2WP12K12
Hi all. Sorry about delayed FIX post. As most of you said, it was restricted exhaust. Exhaust backpressure was more than 15 lbs. Replaced cat conv, upper intake, bank 1 O2 sensor. Couldn't find root cause of cat failure. Fuel pressure regulator was not leaking...
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