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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 18, 2004
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1990 Buick Century Custom 2.5L No Start VIN: 1G4AH54R8L
hello all techs. and thanks in advance for the help. the car runs good the problem is that when you cut the car off and try to start it wont start. if you spray a little gas in the throttle body it starts and runs fine till you shut it off. fuel pressure check...
1996 Buick Regal Custom 3.1L MIL Lamp on VIN: 2G4WB52M9T
Hello GM techs This is a headache from another shop, they have replaced the spark plugs, wires, ignition module, injector and coil. it continues to set code P0306. The car runs perfectly. It will turn the MIL on just from idling in the shop. The misfire monit... Trouble codes: P0306 (cylinder 6 misfire)
1991 Cadillac DeVille 4.9L window motor VIN: 1G6CD53B1M
The circuit breaker in the door (I think it is in the motor) opens as soon as the motor has to put forth the least little effort, though the window is not binding in the door. There is a lot of play at the point where the window attaches to the regulator. We w...
1992 Cadillac DeVille 4.9L engine hot VIN: 1G6CD13B7N
Have this cadillac that has a low volume knocking noise on idle when hot. We cant hear the noise when cold. It sounds like a main knock but it is very hard to tell where it is coming from. Do these engines have a balance shaft if so do they give problems? Have...
1987 Chevrolet R10 Custom Deluxe 5.0L No Start VIN: 1GCDR14H9H
truck came in no start. check out no fire and no injector noid. checked and replaced the stator (pole piece), now have ignition fire but no injector noid. injector wiring has 12 volts on 1 wire only per injector. ran the no start tree for injectors and conclud...
1989 Chevrolet S10 4.3L Poor Idle Quality VIN: 1GCCS14Z8K
Customer brought this in with a surge at idle in gear and running rough at start up complaint. Checked fuel pressure 12-14 psi. Scanned for codes - none present. At idle in gear the truck surges from 450 to 750 rpms lazily. Iac counts are between 38 and 55. Tu...
1995 Chevrolet Lumina LS 3.1L dash lights and parking lights VIN: 2G1WN52M0S
Hello everbody. This car has no dash light or parking lights. All the other lights, ie. brake lights, head lights, indicator lamps, and dome light, are all working okay. I checked the fuses, connections and grounds, all are okay. My first thought was a faulty ...
1997 Chevrolet C2500 Cheyenne 5.7L Hesitation, Cuts out VIN: 1GCGC29R3V
This truck will fall on its face over 3,000 rpm. Feels like the Rev limiter is engaging. Fuel pressure is at 55 psi when failing. I have disconnected the exhaust to eliminate a restriction. I tried a new MAF, No effect. Tune-up items are done:plugs,cap ,rotor,...
2000 Chevrolet Silverado 1500 5.3L drivetrain VIN: 1GTEK19T1Y
Hello everyone. This truck was bought used by a regular customer of ours, he even got about a grand knocked off from the dealer because of drivetrain noises. He had thought the rear diff was bad. Truck will give a clunk that is more felt in the floor than hear...
2001 Chevrolet Corvette 5.7L pinging VIN: 1G1YY22G71
hi, i have this corvette that pings alot under load i replace both knock sensors as per bulletin, also checked fuel pressure steady 60 psi, tested air flow meter and inspected for any dirt in the wires, engines runs good lots of power tail pipe emissions very ...
1992 Oldsmobile 98 Regency 3.8L Electronic Ride Leveling VIN: 2FR12344TY
Things we did to diagnose: removed fuses one at a time removed elc relay on r side relay block under dash, unplugged ride compressor connector, unplugged level sensor at r rear control arm, removed 20 a fuse under drivers side,wiggle tested harness from maxi f...
1997 Oldsmobile Aurora 4.0L blower VIN: 1G3GR62C8V
Thanks in advance for your help. The GM test wants power and grounds checked at the blower and the control module. They are all good (see test results) until you check the blower speed control input from the programmer (to the control module). My result (8.63 ...
1997 Oldsmobile Achieva S 2.4L steering rack VIN: 1A3NL52T0V
When you turn the stering wheel allmost all the way left or right at parking lot speeds you get a vibration not a whine. You can feel it in the seat and stearing wheel. This pump dosn,t have a belt.I also removed the resicter on the return line . Has anny one ...
1995 Pontiac Grand Am GT 2.3L No Start VIN: 1G2NW15D6S
hello fellow iatn techs. this car was towed in to me to see if i could get it to start. as noted it has everything to run but injector pulse. it will start with carb spray. i read in the archives where several techs said they had no injector pulse but then sai...

Fixes & Summaries for GM
Fix/Summary Answers
1984 Buick Regal T-Type 3.8L fuel pump VIN: 1G4AK4797E
the fix wasto check were cam sensor, crank sensor was plug into every one said to check were tey were plug into at i did put new oil switch in thanks to everonethat helpedalso have 3.8 grand nation motor should be rebuid jim
1991 Buick Regal Gran Sport 3.8L Poor Idle Quality, MIL Lamp on VIN: 2G4WD54L6M
This car has been back on the road for about two weeks now with out a recurrence. The last thing I did was replace the TPS again. Many of you that responded recommended checking the charging system because I neglected to post that the voltage and waveform were... Trouble codes: 21 (TPS voltage high), 22 (TPS voltage low), 23 (MAT voltage low), 15 (CTS voltage high), 16 (charging system voltage too high), 43 (ESC circuit malfunction).
1993 Buick LeSabre Limited 3.8L abs codes VIN: 1G4HR53L9P
Thanks to all who responded. The issue has been fix. Here the fix: After bleeding the extensive bleeding. I looked over the front calipers very carefully. With a person in the vehicle pushing the pedal I observed the calipers movement. Yes, the vehicle came in...
1994 Buick LeSabre Custom 3.8L spark knock VIN: 1G4HP52LXR
The customer has decided to just use higher octane fuel to alleviate the symptoms for now. Suggestions I got were 1 cam sensor, 1 MAF sensor, 1 PCM. Two responded to my post with suggestions that the harmonic balancer may be coming apart. Some responded with s...
1995 Buick Riviera 3.8L engine VIN: 1G4GD2218S
after pulling the rod and main bearing caps we could see that sometnig must have gone through the bearings.We polished the crank and installed new rod and main bearings and it was fine.Thanks for all the help.
1998 Buick Century Limited 3.1L Safety VIN: 2G4WY52M0W
When the motor goes in reverse direction to park, under the unit that mounts to the wiper motor output, there is the lever that catches on the metal tab that the motor mounts to. I bent the tab just a little, and also rebent the spring to keep the lever extend...
2000 Buick LeSabre Custom 3.8L tcc dc VIN: 1G4HP54KOY
thanks to everyone that helped believe it or not it was the catilytic converter pluged. I was test driving the car when i thought i heard a rattle from the exhaust so i took it back to the shop and put my back pressure tester on it and it was 2.5 psi at idle 5...
1991 Chevrolet Cavalier RS 2.2L Speedometer VIN: 1G1JC54G6M
First of all one the most used diagnostic tools in our shop is iATN.Thanks to Brian,Mark,Tshaw,etc.Thanks to james from penn- whom stated that all that seemed left was the prom,Sometimes you just need a little reasurance on your own thoughts.With the vss testi...
1993 Chevrolet K2500 Cheyenne 5.7L Poor Idle Quality, Stall, Misfire VIN: 2GCFK29K5P
well i was unable to fix this one. the customer decided to trade it in. thanks for all the input. a couple things i forgot to mention was that we tried a distributor out of another vehicle that ran fine and we re-sealed the intake because of an oil leak at the...
1996 Chevrolet Cavalier 2.2L No Start, Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G1JC524XT
Thanx for the help. We have check fuel pressure while driving - always ok- rechecked plugs - looked like a no-fuel on 2 &3, changed injectors w/ used set, same rough idle. Fuel delivery on accel hwy speed was fine. Fuel pump connections good, engine compressio...
1997 Chevrolet C1500 4.3L drivability VIN: 1GCEC14WXV
I neglected on the first visit to check for vibration at 1500 RPM when in park or neutral. I also didn't pay particular attention to misfire data during test drive, which could have been a cracked plug. Most of the replies asked about these and I apologize for...
1997 Chevrolet Tahoe LS 5.7L Misfire, MIL Lamp on VIN: 1GNEK13R1V
1998 Chevrolet K2500 Cheyenne 6.5L lifters VIN: 1GCGK29F8W
Thanks Mark and Rick, I haven't actually fixed this vehicle yet but Rick was right, I did find an ugly ckack at the bottom of the #3 cylinder. I am now waiting for customer to decide what to do, thanks again, Dale.
2002 Chevrolet Silverado 1500 4.3L down shifting VIN: 1GCEC14W82
Thanks to all that have helped, The owner has elected to live with this condition, i understand he had been to two other dealers in VA. all the best joe
1990 GMC C1500 Sierra 5.7L Poor Idle Quality, Hesitation
problem is going to have to get worse before the customer will have me repair it. I learned that gm throttle bodys will not maintain system pressure after engine shut down. The customer will in all likelyhood be needing a fuel pump in the near future. I will p...
2001 GMC Yukon SLE 5.3L ac tensioner/compressor VIN: 1GKEC13T61
Thank you for all your help and fast replies 17 of them. most of the emails that I got sugested to replace the compressor I was little hesitant at first before I posted my help request, After posting there was no question it was the compressor everybody sugest...
1995 Pontiac Grand Prix SE 3.1L temp sensors VIN: 1G2WJ12MOS
well to everyone thanks for the replies. the computer fixed it .i tried the original one and it would never turn the fans on .the new ecm turned them on at the temp range all you guys who helped me told me it would.as for the starting itself , i'm a one man sh...
2001 Pontiac Grand Am SE 3.4L No Start VIN: 1G2NF52E61
Thanx to all-with every ones advice I was able to get this little racer going-I got the body computer and wiring pigtails from the donor car-we then hooked up only the necessary power supplies and ground-then to trick the antitheft signal we installed a 1.5k r...
2001 Saturn SC1 1.9L Poor Idle Quality, MIL Lamp on VIN: 1G8ZN128X1
Greatest thanks to all, especialy Jim [...]. The number one intake runner gasket was leaking, Jim also explained why the tech 2 followed the mis-fire to cylinder 4. Once again thanks to all replys, this service is a valuable asset to all technicians. To all ... Trouble codes: P0300 (mis-fire can monitor with tech 2).
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