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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 30, 2004
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Open Help Requests for GM
Help Request Answers
1992 Cadillac Seville 4.9L Lighting VIN: 1G6KS53B3N
this car came in running but instrument cluster was inop did some testing and found that cluster bad replaced cluster its working properly but now car will not start now and cluster is displaying switch problem and keeps advising me to wait three minutes can u...
1996 Cadillac DeVille 4.6L head bolts VIN: 1G6KD52Y6T
looking for someone who has been there done that. got this caddy, head gaskets leaking, during torque procedure on head bolts threads in the block pulled. cadillac makes insurts for this common problem and i now have them in my possesion but am unsure as to in...
1968 Chevrolet corvette 327CID headlights
hi guys, customer brought car in after having someone do restoration off body, i am trying to find source for vacum diagrams, interior vacum is not working or headlight systems, i cant find any older chilton manuals and have contacted alldata and they didnt ha...
1986 Chevrolet Corvette 5.7L Poor Idle Quality, HESSIATES COLD VIN: 1G1YY0786G
the vehicle will start fine, but when cold and put into gear it hessitaes, also when cold and engine is reved in park there is a hessitation felt. once it has warmed up the vehicle drives and performs fine. the ignition system checked fine on an ignition scope...
1992 Chevrolet Beretta 3.1L MIL Lamp on VIN: 1G1LV15M4R
We have inherited this problem from another shop. Check engine light was on - other shop replaced O2 sensor and EGR valve. Check engine light came back on - other shop replaced EGR 2 more times and CEL still comes on. Now I have it. When you first start drivi... Trouble codes: 76 (EGR problem), 77 (EGR problem)
1994 Chevrolet K2500 Suburban 6.5L No Start, Stall VIN: 1GNGK26F1R
good day all and thanks for reading. this suburban just towed in, customer complaint is that it will start at times and sometimes not. alarm installed 3 months ago.(checked alarm wiring and system only kills cranking) started and drove in shop, scanned and one...
1995 Chevrolet P30 CHASSIS 7.4L Poor Idle Quality, Hesitation, Surge VIN: 1GBLP37N7S
Hope someone can help wiyh this motorhome, customer brought in with complaint of stall at idle and surge at idle,no codes in system, sometimes if you accel. it will bog out to the point of shutting off unless you let up on throttle,will do this unless you acce...
1997 Chevrolet Monte Carlo LS 3.1L No Start VIN: 2G1WW12M4V
Well like I said in a previous post on another GM, we are seeing the worst this week. This Monte was in for a no start and we found no wave form on the front crank sensor and once it was running had diagnosed a faulty module. The vehicle was gone a day and cam...
1999 Chevrolet Express 3500 LS 5.7L pad wear VIN: 1GAHG39R6X
Can anyone please offer suggestions for two possibly related problems? The front brake pads last an average of 15,000 miles before needing replaced. I've checked TSB's about proportioning valves and softer rear brake lining; but they don't seem to apply to thi...
1996 Geo Tracker 1.6L MIL Lamp on
Keeps setting an EGR trouble code. Replaced manifold pressure differential sensor and backpressure transducer System appears to work normal, a couple inches of vacuum will kill engine. HELP!
1997 Oldsmobile Regency 3.8L Surge VIN: 1G3HC52K0V
Hello everyone, I have a weird one here! This olds has a surge at highway speeds. It will only start to surge if you a pulling a slight hill or loading the engine a bit. When it is'nt surging, the car runs great, no complaints. I took a snapshot at the time th...
1998 Oldsmobile 88 Royale 3.8L Misfire, MIL Lamp on VIN: 1G3HN52K7W
Vehicle came in for coolant loss and MIL. Pressure tested coolant system, open throttle plate and watched Dexcool run out of intake. Changed upper plenum and plugs. Cleared p0306 and test drove vehicle. Ran great. Released vehicle to customer. The next day cus... Trouble codes: P0306
1999 Oldsmobile Alero GL 2.4L front end VIN: 1G3NL52TOX
this vehicle has a loud creak pop noise from the front end, mostly when shifting th weight left to right by swerving at slow speed. I can't reproduce the noise in the shop only when moving. seems like sub frame is sliding around or something.
1995 Pontiac Trans Sport 3.1L Lifters, bearings VIN: 1GMDU06D75
This wonderfull GM product came in last Friday running rough. One of our other techs diagnosed and found bad cap, rotor and wires. Replaced them and vehicle ran well. We saw our oil change sticker on their windshield and saw that it was 6,000mi over due and no...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick LeSabre 3.8L MIL Lamp on VIN: 1G4HP54COJ
thanks for all the great replies , it turns out false code 43, did tap test , ecm failed , replaced it ,no more cels ! thanks everyone iatn rocks! mike [...] Trouble codes: 43 (knock sensor or other sensor problem).
1994 Buick LeSabre Custom 3.8L Hesitation, MIL Lamp on VIN: 1G4HR52LXR
thanks to all who helped. as it turns out the code chart in alldata seems to be wrong as resistance on circuit 423 is 9.5k ohms and they want less than 300 ohms. this led us to replace ignition module and not fix code. car ended up with new ecm to correct prob... Trouble codes: P1361.
1999 Buick Park Avenue 3.8L No Start, Misfire, false scanner data? VIN: 1G4CW52K4X
This vehicle has had multiple symptoms and worse yet they have been very intermittant. The customer took the vehicle and return it to us when it begins acting up again. Thanks for the replys! Trouble codes: P0300.
1992 Cadillac DeVille 4.9L No Start VIN: 1G6CD53BXN
What a nightmare. I previously put in a rebuilt distributor for thinking that was the problem, it was the distributor. I pulled the computer out from under the dash. I put my vantage on the brown wire/white strip. this wire comes from the cam sensor built into...
1995 Cadillac DeVille 4.9L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Poor Fuel Economy VIN: 1G6KD52BXS
I recieved 6 replies and 3 of them hit the nail on the head. the main ground to the engine block did not have star washer on it and was not making good contact. the cam shaft sensor in the distributor was without a good ground for such along time that it was n... Trouble codes: P0052.
1997 Cadillac Seville STS 4.6L abs VIN: 1G6KY529XV
Well the customer has grown impatient and says he wants to go to the dealer. The problem is so intermittant that I could not find anything conclusive. I monitored the wheel speed sensors with scanner when problem occured and no problems showed on scanner. I mo...
1992 Chevrolet K1500 Cheyenne 5.7L No Start, Excessive cranking VIN: 2GTEK19K5N
Good Morning, Great news.. The 1992 Chevy 4x4 is fixed and running great. And as most of you mechanical wixards suggested, the Distributor shaft was bad. The lower part of the shaft was worn, but couldn't be detected until the shaft was completely removed fr...
1993 Chevrolet Astro CL 4.3L No Start, Cuts out VIN: 1GNEL19W0P
Another nightmare gone. Once again, put the labscope on the injector wire going into the plenum. sometimes I wouldn't get a signal, checked crank sensor, all sensors everything checked good but injector signal. replaced ecm with aftermarket unit. It started an...
1994 Chevrolet P30 Motorhom 454CID Hydroboost/ P/S VIN: 1GBKP37NXP
Thanks to all who replied. Howard was on track. The fix for this vehicle was to bleed the auto park brake actuator, which is on the frame near the transmission and park brake drum. I also talked to a tech at Bendix who stated; bleed the actuator with the engin...
1996 Chevrolet Express 3500 5.7L Stall VIN: 236G790W26
ok this one is fixed, thanks to everybody who replied and gave some good idea's as to what the problem could be. we replaced the egr valve and fixed the problem. thanks again to everyone jay
2000 Chevrolet Blazer LS 4.3L differential VIN: 1GNDT13W2Y
thanks to everyone for your help the tech working on the vehicle found out a few days ago that gm says to replace motor on transfer case at the same time as the encoder module we think due to the fact that there are two diodes in the motor and they or one goes...
1995 Pontiac Grand Am SE 3.1L no shift VIN: 1G2NE55M7S
Checked all the fuses and found one fuse blown, E R L S fuse on drivers side of dash was blown .Searching the internet shows this fuse controls transmission solenoids , A/C , and backup lights. replaced fuse and advised customer to try and let me know if all i...
1999 Pontiac Grand Am SE 3.4L high idle VIN: 1G2NE52E6X
thanks to all .. we found the tps was sticking very intermittantly . causing our problem. changed it and retested many times it seems to be repaired. it is surprising that it was only off about 3 to 4 tenths of a volt
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