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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 25, 2005
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Open Help Requests for GM
Help Request Answers
1992 Buick Skylark Custom 3.3L No Start, no check engine lite VIN: 1G4NJ54N8N
hello iatn members i am posting this message for a fellow mechanic. car came on a hook, for a no start. he acknowledge the vehicle has spark, but no injector pulse, tried to scan vehicle with a "red brick", "no communication", also notice "no check engine li...
1995 Buick Park Avenue Ultra 3.8L idle-noise-vibration VIN: 1G4CU5219S
Hello fellow Technicans, this car runs well and sounds normal, no vibration at idle, until I replaced the factory (?) plastic idler pulleys (4 worn) with new steel (3) pulleys and (1) plastic ribbed idler, now have a rattle noise and vibration at idle only, th...
1965 Chevrolet C10 350CID alignment specs VIN: 4C154A1194
We have built this 65 Chevrolet and went to align it but found we don't have any specs for the vehicle. The furthest we go back is 1972. If someone has the specs for the 65 C10 I would very much appreciate it. fax # [...]
1989 Chevrolet C1500 Cheyenne 4.3L P/S Pump VIN: 1GCDC14Z8K
Hello all. i need some ideas on this one. i have replace the ps pump on this thing three times in the last year. they have all failed in the exact same way. they break the pump of inside and you can pull the shaft right out. i have checked the steering compone...
1991 Chevrolet C1500 454 SS 7.4L Surge, Cuts out, MIL Lamp on VIN: 1GCDC14N9M
Vehicle presented with surge at cruise. Noted TCC was commanded on and off. Traced wiring-ok. No DTC's in PCM. Scoped TPS, MAP, and O2. Ck'd fuel pressure-15 KOEO. Replaced TPS and pressure regulator. Problem still present, so ordered up PCM. Replaced PCM, tra... Trouble codes: 45 (Exhaust Rich)
1997 Chevrolet Lumina 3.1L no symptoms..just mi VIN: 2G1W52M5V9
Car came in with a P1675.Solenoid was recently changed.Can feel rapid pulsations at the solenoid.Should the evap system be smoked?The cae has zero drivability problems..just the mil is lit.Thanks in advance,Randy Trouble codes: P1675 (EVAP Vent Solenoid Control Circuit)
2002 Chevrolet Silverado 1500 5.3L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire VIN: 2GCEK19T82
Need some help on this one because I'm obviously missing something. Truck came in with obvious misfire, and customer complaint of low power and dieseling. Initial test found no communication at ALDL. Had blown fuse, replaced. After scanning, found codes 301, 3... Trouble codes: 300 (Multiple Misfire), 301 (misfire cylinder 1), 307 (misfire cylinder7)
1996 GMC K2500 Suburban SLE 6.5L Poor Idle Quality VIN: 3GKGK26F2T
truck has very rough idle - no trouble codes. fuel injection pump replaced by dealer 1 month ago. fuel quality is good. how common is injector failure with this vehicle?
1991 Oldsmobile Toronado Trofeo 3.8L Excessive Emissions VIN: 1G3EV13L4M
Need some help guys...This Olds came to us to repair because it failed as a gross polluter. Initially were unable to scan. After reading posts we found that the instrument panel (which was just laying in the dash) was inoperative and that by unplugging it we c...
1999 Oldsmobile Alero GL 3.4L MIL Lamp on VIN: 1G3NL52EXX
Vehicle presents with no shift quadrant display, no odometer, no tach or fuel gauges, no hi-beam indicator. All fuses test good. Computer will not communicate with our M2500 scanner despite numerous attempts. After cycling key off and on again now all dash lig...
1974 Other GM Shovelhead. 1586CC Magneto VIN: 0123961239
Hello lads, I need some help on this one this probem has had me scraching my head. Have any of you good people had any experiences with setting the mag timing on a Harley Davidson Shovel head before? I have set the timing on either cylinder just before T.D.C. ...
1996 Pontiac Grand Am SE 2.4L MIL Lamp on VIN: 1G2NE52T4T
vehicle came in with a code p0600. everything that I read said to replace the pcm. has anyone had a similar code and was the fix was to replace it? I do not want to replace it and find out it was something else. all the power and grounds are good. Trouble codes: P0600
1997 Saturn SC2 1.9L Misfire VIN: 1G8ZG1277V
this car shows missfires on cylinders 1&4 engine runs great though, you see them at cruise somtimes but they really show up on decell , crank is in sync, car also has new wires & plugs , coil packs check out & switched them with 2&3 with same results, also mis... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
1995 Cadillac Seville SLS 4.6L Excessive Emissions VIN: 1G6KS52Y0S
Thanks for all the responses. I diabled the abs by disconnecting the brake fluid level sensor and replaced beth o/2 sensors and the nox readings were both under 50 . Mike [...]
1997 Cadillac DeVille 4.6L Oil leak/burning? VIN: 1G6KD54Y6V
We are hoping this vehicle is fixed. Performed TSB for piston soak treatment, replaced pcv (again) and no drop in oil to date. Customer does not drive enough to be sure yet, but no oil under intake yet!!
1992 Chevrolet C1500 Cheyenne 5.0L No Start VIN: 1GCEC14H0N
Good morning group, sorry for the delay in the 'fix' post This was a good one. The overwhelming majority said the dist. armeture fails & loses it's magnetism, which can be indicated by cracks in the pole piece. I pulled & checked, and there were definate cra...
1995 Chevrolet Astro CL 4.3L Brakes VIN: 1GNEL19W3S
Well guys, it seems that I should pay more attention to what my guys do out on the floor, and double check everything! The guys did NOT switch everything as I was told! What the fix was, was changing the friction material. The customer had changed the caliper ...
1995 Chevrolet Lumina APV 3.8L Hesitation, Cuts out VIN: 1GNDU06L5S
I want to thank everyone for their help. I got some very good suggestions on this one. Unfortunately no one had the right answer. Terry from Michigan had a suggestion that I hadn't thought of. The power supply to the injectors might be dropping out under accel...
1998 Chevrolet Prizm 1.8L Hesitation, Cuts out, Misfire VIN: 1Y1SK5282W
Thanks for everyones input. The fix was two parts: first was the crank sensor. Crank sensor was weak, old one 8.2 volts peak to peak with very minor fluctuations in signal and new one was 11.2 volts peak to peak with no fluctuations. Dont know why it didnt set...
2001 Chevrolet Suburban 1500 LT 5.3L Drivetrain VIN: 1GNFK16T11
Ray from Minnesota hit the spike on the head with changing out the fluid to the newer Auto-Trac II number [...]. Took most of the vibration out of the unit. Thanks to all who took the time to send me info!!!
2002 Chevrolet Trailblazer LS 4.2L Stall VIN: 1GNDS13S22
trail blazer died again friend talked to chevy dealer about this problem . they said they have been replacing the throttle body with new one. friend replaced throttle body and trail blazer has not died for two weeks. thanks for everyone who posted to this.
2002 Chevrolet Cavalier 2.2L coolant fan VIN: 1G1JC12462
Well, thanks to all that replyed !! Well, Amin [...] Rusty were on the money, clogged heater core. The hose goes from the bock to heater core to the back of the thermostat housing, so when there is low flow, the thermostat doesnt get hot enought to open, flushed...
1994 Oldsmobile Cutlass Supreme 3.1L dome lights VIN: 1G3WHSSM9R
Hello all We messed up on this one,it is the headlight switch causing the draw killing the battery.What we did wrong was use a test light for a draw at the main fuse,we should have used a a larger light(like a headlight as some Guys are)There is so many item...
1995 Pontiac Grand Am SE 2.3L No Start, Stall VIN: 1G2NE15D4S
Well, we gave up and sent it to another garage. They still haven't figured it out and are currently tracing the entire engine control harness(lucky them!) If anything changes, I'll be sure to re-post. Sorry about the delay in closing, we've been out straight.....
1998 Pontiac Sunfire SE 2.2L Starting VIN: 12JB1247X7
Thanks to the seven who responded. Most of you were leaning towards the cranks and or cam sensor. After replacing both and still having the same problems (luckily our local gm dealer let us try the parts & return them if they did not work). We called a tech su...
2001 Saturn L300 3.0L mil VIN: 1G8JW52R31
The first reply I recieved was dead on the money. I had failed to mention that I put a battery in the vehicle right in the middle of testing. Sorry, I was flustered and it just escaped me. I was unable to clear the pcm codes with both the Snap On scanner and t...
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