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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 30, 2007
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Open Help Requests for GM
Help Request Answers
1984 Buick Century Custom 3.0L alternator VIN: 1G4AH19E9E
after replacing the alt. and battery (at cust. request) the vehicle still wouldn't charge. i found that the bulb in the instrument panel completes the circuit to activate the alt, and i checked it and found it to be missing. i installed a new bulb and socket i...
1987 Buick Regal GNX 3.8L piston oil ring VIN: 1G4GJ1175H
Howdy again, going to blow my whole wad today! I got this Grand National that came in with a loss of compression on the right bank. We pulled the right head expecting to see a pushed head gasket. When we didnt see that, we put it aside for a couple of months. ...
2003 Buick LeSabre Custom 3.8L Cuts out, Stall VIN: 1G4HP52K13
Hi to all - This car has been fun and we have all had at least one. The hard part is it may go a week or two and drive fine, and if it stumbles a bit it happens so fast it's hard to determine what the problem is. It has stalled a few time when driving. When it...
2000 Cadillac DeVille 4.6L fourth gear VIN: 1G6KD54Y7Y
Howdy every one, Got a real little old lady story here. New referral, she goes on a trip to visit kinfolk and the overheated transmission/park and let idle warning comes on the dash along with a service engine light. She does this and then proceeds to a dealer...
1994 Chevrolet C1500 5.7L compressor VIN: 1GCFK28KIS
Hi all tech I have this pick up.Problem ac does not cold high side stay at 175 psi low side at 75 psi found no leak. compressor engage but does not cycle can some one help me to solve this problem. Thank You
1994 Chevrolet C1500 Suburban Silverado 5.7L air flow VIN: 1GNEC16KXR
Howdy again, One our best customers is complaining about low air flow from the front vents on her suburban. We replaced the blower motor with 160k miles on it and found the squirrel cage blades to be filled with dust in the concave area reducing the air foil e...
1995 Chevrolet C1500 Cheyenne 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 2GCEC19K6S
So, here we go again. Seems like we can't figure anything out lately. This one came in with a complaint of poor idle, runs rough, lacks power and backfires through the intake. Customer replaced the cap, rotor, plugs and wires to correct the problem but nothing... Trouble codes: 33 (map sensor - cleared and hasnt come back), 44 (lean exhaust)
1996 Chevrolet Camaro Z28 5.7L cooling fans VIN: 2G1FP22P5T
I replaced ecm and had reflashed. I changed the heater hoses and thermostat. I can command low and high speed fans to come on and the car still overheats. At an idle the car reaches 230 degrees and low speed fans come on. The car continues to get hotter. While...
1997 Chevrolet K1500 5.7L Surge VIN: 1GBEK19RXV
Hi Guys, This truck runs good in every way except while cruising. After awhile at highway speeds it will begin to surge. I've checked everything and ran the scanner on it. The code P1345A which is "CKP/CMP correlation" pops up right after clearing it. On the ... Trouble codes: P1345
1999 Chevrolet Venture 3.4L Hesitation, Cuts out, Stall VIN: 1GNDX03E0X
This vehicle came in the shop about a month ago, when hot, it would hesitate and stall at times. I plugged otc scanner in, there are no codes. I had ignition modules do this in the past so I replaced it. That lasted about a month. It came back on Monday with t...
2002 Chevrolet Silverado 1500 4.3L Hesitation, Surge, MIL Lamp on VIN: 1GCEC14W42
truck would send 2 codes 1 for the thermostat saying it was not cooling enugh and one for bank 1 sensor 2 truck runs good while drivin but when your stopped it seems to shut off or surge real bad
2002 Chevrolet Silverado 2500 HD 6.0L Misfire VIN: 16CHK29U82
just looking to see if anybody had one in yet for a po300b code, engine missfire detected yet, put new wires, plugs, and switched the coils around, fuel pressure is good. going down the highway around 70mph or greater the check engine light flashes at you, you... Trouble codes: P0300
2007 Chevrolet Silverado 1500 Classic LS 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 3GCEC14XX7
This is a new truck (84 miles) that has been wrecked and rebuilt. I purchased at local salvage auction and have performed all repairs myself. It was damaged under the front, pushing the frame and engine up a few inches. Whatever it hit, it went over it damagin... Trouble codes: 300 (random/multiple misfire)
1992 Geo Metro 1.0L Poor Fuel Economy, spark knock VIN: 2C1MR6462N
Hello all, This old Geo spark knocks always on hills and hard acceleration. Egr passages have been cleaned and the egr valve is funtional as well. Timing has been set according to emissions label and advances properly. Checked for a knock sensor and the vehicl...
1993 GMC K3500 Sierra SLE 6.5L overdrive VIN: 1GTHK33F2P
Thanks in advance, This simple job has eat my lunch, After the engine replacement at another shop the customer complained of high RPM's while driving, I found that the TPS had not been transferred from the original unit. I Install a new one and Still no 4th ge...
1998 Oldsmobile Intrigue 3.8L ac controls VIN: 1G3WH52K9W
car came in with air running a few seconds then turning off. the light on panel goes out and comp. shuts off. push button and comp and light come on for several seconds ,then off again. anyone seen this before? thanks jay
1992 Pontiac Grand Am SE 2.3L MIL Lamp on VIN: 1G2NE5439N
Code will set right after start up. Also thought of a/c voltage from alternator. Unplugged same results. Tested powers and grounds at PCM with 7 amp load. All tested good. Thanks in advance for any help. Trouble codes: 43 (ESC Knock Sensor)
2000 Pontiac Bonneville SE 3.8L Brake pads / rotors Rear VIN: 1G2HX54K8Y
Problem: noises / resonating sound / Groan from rear brakes, when heated up and hard braking. What's been done Already. Replaced pads and rotors 1st as noted above low linings and right rear went metal to metal. job done and came back with this noise problem. ...
2004 Pontiac Grand Prix GT1 3.8L Heater operation VIN: 2G2WP52204
heater blower motor works at random. will stop working when driving and not start again for atleast a few days or a week. at times would come back on just by driving over a bump, other times could go off-roading and would not come back on. everytime in shop wo...
2003 Saturn L200 2.2L oil leak VIN: 1G8JU54F43
car came in for transmission leak found transmission fluid leaking from front seal remove transmission and send to trans shop to check out. trans shop installed new front seal and we put back into car. now when driving 20 miles and put back on rack it is leaki...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick LeSabre Limited 3.8L No Start VIN: 1G4HR53LXN
thanks for all the help, We got many replies. We tried a new pcm and it did not fix the problem. we checked tps good and no vats problems. I decideed to go back to what we origianally suspected and replaced the new crank sensor with an a/c delco unit. L...
1993 Buick Park Avenue 3.8L Unknown VIN: 1G4HY54I92
first thanks for the twenty replies all were great and most hit it on the head,,the harmonic balancer was at fault,,she purrs like a kitten,,,once again iATN ROCKS...
1992 Cadillac Eldorado 4.9L info.center,fuel guage,power windows,abs &ck.engin VIN: 1G6EZ13B4N
2000 Cadillac DeVille 4.6L oil level light VIN: 1G6KD54Y1Y
Thanks for the replies. Sorry for the delay. I guess I was missing something during my diag. It turned out to be the switch. This heat must have been getting to me or something. Keith
1988 Chevrolet Corvette 35th Anniversary Edition 5.7L starting circuit, fuel curcuit VIN: 1G1YY3183J
You guys are the best proof that Mechanics are Great peaple. Ordered the kit from painless wiring and installed even though it says only for 91-95 vehicles. as long as you can find the injector wire at ecm, no problem. Vehicle starts everytime w/no security l...
1991 Chevrolet Camaro RS 5.0L temp gauge VIN: 1GIFP23E9M
thanks to everyone that responded to my help request. the problem came up to be a missing lower air dam under the car. we installed one and problem solved.
1995 Chevrolet S10 4.3L No Start VIN: 1GFCCS19ZS
truck is fixed thank you for the many replies and advice.Klaus,from S.C.got me to thinking about the common test light check.I was testing at the fuse box and underhood w/the test light,but not at the pcm.I guess I was concerned about a ground problem and not ...
1996 Chevrolet S10 4.3L No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GC1S67X9T
Sorry i should have posted this different. I just wanted to add to our archives for you guy's. The truck was repaired and all is well. Re-read the post and you can understand the repair. Trouble codes: P0122, P1122 (tps), P1406.
1997 Chevrolet K2500 Cheyenne 7.4L extended crank VIN: 1GCGK29J9V
What to thank all that replied, It turned out i have a leaking fuel pressure regulator, replace with a new one and so far so good. thanks again.
1999 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEK13R9X
I want to thank everyone for their quick responses to my help request. A couple of people told me I should do a running compression check, so I decided to do a regular compression test and then a running compression test. All the cylinders were very close to...
2001 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK52841
cleaned debris out of lines and valves all replies helped in the diag of this carcleared codes and ran evap test returned car to customer at no charge Trouble codes: P0441.
2003 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Surge, Stall VIN: 3GNEK13T62
Thanks for the replies and it is more my fault for not doing basics before posting but I was thinking in the wrong direction. I replaced fuel filter and cleaned intake and rail as well as tried a MAF after finding no evidence of the newer intake having fault ... Trouble codes: P0171 (lean), P0174 (lean), P0300 (random multiple misfire).
2003 Chevrolet Trailblazer LS 4.2L Control VIN: 1GNGS13S33
Replaced Mode Act. The guys a the chevy dealer said I would have to reprogram the vents.This wasnt the case and the act. fixed it!
2004 Chevrolet Impala 3.4L Misfire VIN: 2G1WF52E64
Thanks again for all the replies. Mostly everyone thought as I did that I had a vacuum leak that I couldn't find. After some convincing of my boss and the customer we decided to take the lower intake off and see. There was no evidence of a leak but after re...
1989 Oldsmobile Delta 88 Royale Brougham 3.8L speedometer VIN: 1G3HY54C5K
About all replied the speedometer was bad. It does work on a ground pulse. I found out if you turn the key off, unplug the center connector on the ECM, turn the key on and tap to ground the speedo wire(dk. green) the speedo should jump. A used speedo fixed it....
1992 Pontiac Grand Prix LE 3.1L speedometer VIN: 1G2WH54T5N
2002 Pontiac Grand Am SE1 2.2L No Start VIN: 1G2NF52F42
We flushed the injectors, we flushed the intake it would start better. Still had to have ground on the purple wire. We replaced plug @ ecm. Car starts [ok] spent a lot of time with a tech hotline he thought we had a ground issue. All the grounds I could find w...
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