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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 22, 2008
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Open Help Requests for GM
Help Request Answers
1988 Cadillac Brougham 5.0L heater/ a/c unit VIN: 1G6DW51Y1J
Good afternoon. Well I know this may cause several of you to scratch your heads and ask " What was this guy thinking?", but here goes. Was trying to change the heater core in this cadillac, which sounds simple, but when I went to remove the core the blend door...
1973 Chevrolet Corvette 454CID headlights VIN: 1Z37J35421
I have inherited this corvette. It has a comp cam and makes 16 inches of vacuum. The headlights open intermittantly. The switching and vacuum supplies/reservoirs are good. Does anybody know how many inches of vacuum it takes for these headlight actuators to wo...
1999 Chevrolet Lumina 3.1L Surge VIN: 2G1WL52M7X
Car came in for heater hoses due to leak. Repaired them and test drove fine. Customer came to get and tried to back out of the parking sopt and the thing started to buck and surge real bad. The next morning tested and it runs great for about 2 minuets and then... Trouble codes: P1106
2000 Chevrolet Silverado 1500 5.3L Hesitation, Surge VIN: 1GCEK19T7Y
greetings everybody we are at witts end on this unit .only one code has ever appeared on this truck that was po446 thats when we relocated the vent to the firewallas per tsb.all other parts listed in repair history were installed on 2nd work order.truck ran fi...
2001 Chevrolet Suburban 1500 LS 5.3L abs VIN: 1GNEC16T81
hi all. both ABS and brake warnig lights come on. scanned and retreived code 265, which relates to a TSB requiring body grounds to be cleaned and reinstalled. Well I did this but to no avail. as soon as you drive it, lights come on and code sets, Im assuming t...
2001 Chevrolet S10 2.2L Rear Brake Lights VIN: 1GCCS14581
Rear Brake lights are staying on. I have changed the brake switch at the brake pedal. Lights went out. Customer came back the next day, lights staying on. Went through Mitchell electrical drawing and determined the problem must be in the multifunction switch. ...
2002 Chevrolet Cavalier LS 2.2L Starting VIN: 1G1JF52482
please help. this car has an intermittent no start condition. we tow it to the shop and drive for a week, and it starts every time. soon as we give it to customer next day it wont start, every week for a month same deal. all codes that are pulled are u codes. ...
2005 Chevrolet Equinox LT 3.4L Poor Idle Quality, Stall VIN: 2CNDL73F35
HI my customer has A 05 EQUINOX 3.4 and at random when he refuels it an trys to leave the gas station it stalls & won't idle right for a min. or so. He revs it a few times to red line and it gets over it some times it will misfire for a mile or 2. Never seems ...
2006 Chevrolet Impala LS 3.5L heat VIN: 2G1WB58K46
This car has no heat at idle.raise eng. rpm and you get heat almost instantly. Eng. at normal temp. Temp door working normal.At idle heater hoses not hot.
2002 GMC Yukon XL 2500 SLE 6.0L Unknown VIN: 3GKGK26U52
Ok bear with me on this one, it is going to be tricky to describe but I will do my best. Today the customer came in with a noise concern and now I will try to desribe the noise. It sounds a lot like a belt squeek inside of a hollow room. It is always there and...
2005 GMC Envoy SLE 4.2L MIL Lamp on VIN: 1GKDT13S95
Code in system is P0054 for rear oxygen sensor heater resistance. Customer originally went to Auto Zone where they read the code & told them they needed a rear oxygen sensor. Customer replaced it & disconnected battery to clear code. The next day the light cam... Trouble codes: P0054 (rear oxygen sensor heater resistance)
1997 Oldsmobile Aurora 4.0L control arm bushing VIN: 1G3GR62C4V
Can anyone tell me if the front verticle control arm bushings in this car are servicable. All the information I have is telling me control arm must be replaced. The bushings look the same as a Grandprix, or Impala and I wonder if anyone has had any success cha...
2001 Oldsmobile Alero GL 2.4L no start VIN: 1G3NL52T11
Customer called said car would not start. Had AAA come and try to start, they started the vehicle using automatic starter, and customer drove to shop. Car sat overnight in parking lot. In the morning went out to start and would crank but no start. Used auto st...
2007 Other GM Step Van 6.0L No Start, Surge, Cuts out, Stall, MIL Lamp on VIN: 5B4KPD2U67
This is an on going problem that is getting out of hand. This is a 2007 GM chassis (workhorse) w/ a 6.0L gas and automatic transmission w/ approx 100,000km on it. Vehicle orginally came in running very rough. We found the PCM was only firing 6 of the 8 coils ...
1996 Pontiac Firebird Formula 5.7L Shock Area VIN: 2G2FV22P6T
Formula WS6 noise in shock shock, when driven little click noise on repeted bumps. So I replaced shocks, mounts, Insulator in center of mount. did not replace coils. All was good I was happy. day later noise different but loader like a shock bottoming out or e...
2002 Pontiac Bonneville SLE 3.8L battery goes dead VIN: 1G2HY54K72
this car is giving me grief the car has over a 2 amp draw. on the shift indicator the p stays illuminated, if i unplug the transmission the p goes out but draw is still present. unhooked the ign. switch to no avail the draw is still there. i am able to use the...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac Seville SLS 4.6L seats VIN: 1G6KY5494Y
this one is finally fixed most everyone said check the cushion sseat heater on drivers seat put the ohm meter onit and sure enough it was no good replaced seat heater grid and all is well now thanks for all the help.
1998 Chevrolet Camaro 3.8L coolant VIN: 2G1FP22K7W
thanks guys it was the cap sorry i did'nt answer sooner so simple.
1999 Chevrolet Silverado 1500 5.3L Odometer and PRNDL indicator VIN: 1GCEK19T2X
Thanks to all who responded tons of useful information. the customer brought the vehicle back in for further diagnosis today and she was excited because it started working again. so she doesn't want any further diagnosis until it acts up again. the good new...
2001 Chevrolet Blazer LS 4.3L Hesitation, Surge VIN: 1GNDT13W71
Thanks for everyones replies.I ended up sending it to the dealer for a reflash as I did'nt have the proper scanner,and they ended up spending 3 hours on it! The dealer put a new transmission control unit in.I never got any codes for the trans,but it was happen...
2004 Chevrolet Silverado 2500 HD 6.0L Air Bag Light VIN: IGCHK23U34
Thanks for the replies. Michael & Joel nailed it perfect. Wire under drivers sill plate was cut . Repaired the wire & everyting Worked perfect. Thanks again for the help
2005 Chevrolet Silverado 1500 SS 6.0L MIL Lamp on VIN: 1GBHC24U15
well after trying the tac module and throttle body and checking all wires and grounds it worked for about a week then light came back on. customer took vehicle to dealer and they replaced all related wiring harnesses and ign switch, customer called me as a fav...
1996 GMC K2500 Suburban 7.4L cranking VIN: 3GMC48277W
Well... After installing the updated crank sensor, still no start, so I pulled the distributor only to find the gear sort of hour glass shaped. It turns out this truck has 260k miles! I replaced the gear, set the cam retard to 0 degrees and all is well. I want...
1997 GMC C1500 Sierra SLE 5.7L No Start VIN: 1GDEC19R6V
1998 GMC K1500 Sierra SL 5.7L No Start, Stall VIN: 1GTEK19R8W
We found that we were losing fuel pressure due to a fuel pump wire that was nearly broken.There was a clamp on top of the frame securing the harness and it was smashed down on top of the wiring.I tried to buy a new one but wound up rewiring the harness instead... Trouble codes: P0452 (fuel tank pressure sensor low).
2001 GMC Savana 3500 5.7L Hesitation, Cuts out, Stall VIN: R811900469
Thanks for all the replies, We all have pulled our hair out on this one. We had an out side driveability tech take a look at this one. He found nothing, we double checked all connections and will check again when its acting up! I will post news in the future w...
2002 GMC Envoy SLE 4.2L Exhaust Noise/Leak VIN: 1GKDT13SX2
Thanks to all who responded I took a look under the heat sheild and I think I see the crack, just have to order the parts and repair per the TSB... Thanks again
2003 Hummer H2 6.0L compressor VIN: 5GRGN23U13
thanks for all the great feedback. The customer decided to trade the car in for a new tahoe, so I never got to replace the compressor as several sugested but im sure that was the problem thanks for all the great responces.
1995 Oldsmobile 88 Royale LS 3.8L MIL Lamp on VIN: 1G3HY52K4S
Checked power and grounds, all o.k. In the meantime, car went to transmission shop for tranny replacement. Vehicle has not returned yet for further diagnosis.
1998 Pontiac Trans Sport Montana 3.4L detonation VIN: 1GMDU03E4W
it turns out that the software system that the engine builder used had a computer glich and gave the number for 1995 pistons, which only have a .087 dish as to needing a .287 dish, my compression ratio was way to high, so the engine is off to be rebuilt again...
2001 Pontiac Grand Am SE 2.4L timing chain VIN: 1G2NE12T41
Sorry for the delayed response but the vehicle is just fine . I kinda left this up to my apprentice in the begining and that was my first mistake . It seems that he forgot to hear my very first instruction after I heard the noise ("try it with belt off") . Too...
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