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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 7, 2006
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Open Help Requests for GM
Help Request Answers
1982 Cadillac Cimarron 1.8L Poor Idle Quality, Stall VIN: 1G6AG69G6C
Before you laugh out loud, this is a serious request. The carb base gasket which is a heated grid in a rubber mount is badly cracked and leaks like a sieve when smoke tested. They are no longer available from GM, go figure. Does anyone have another source for ...
1990 Cadillac Eldorado 4.5L interior lights VIN: IG6EL1337L
hi all have a problem with interior lights inop when you open the doors. they come on with the switch only.i have tested each door pinn switch and handle switches at bcm all are ok ,have no bcm faults either.so i replaced the bcm ,still have same problem.has a...
1993 Chevrolet C1500 Cheyenne 4.3L transmission VIN: 1GCEC14Z1P
Hey everyone, I've been scratching my head about this one for a while. This one came in on a hook with a hole in the block. I replaced the 4.3L and went to test drive. It shifts good at a medium or heavy throttle, but at a light throttle it will shift gears wa...
1999 Chevrolet Venture 3.4L heating syst VIN: 1GNDX03E1X
this hvac system throws no heat(front or rear). a/c works fine & air flow comes out the correct vents. turning temperature control has no effect. coolant is full & both heater hoses are hot. before i start tearing into dash unit i was wandering if there is any...
2000 Chevrolet Silverado 1500 5.3L prestone in oil VIN: 2GCEK19T7Y
the customer told me that the prestone goes down,it takes 1 liters by week and oil in engine goes up.First off all,I check the prestone in oil and i found some.I put the pressure on rad and pressure hold,doesn`t go down.there isn`t any leak outside engine.Irep...
2001 Chevrolet Suburban 1500 5.3L on star VIN: 3GNFK16T71
Hi, everyone. I have a noise coming out of the on star speak it like alternator noise you would hear out of a radio on a older car. this noise will happen with engine running & with engine not running key on. what funny is when you turn key of noise slows down...
2002 Chevrolet Silverado 3500 8.1L Hesitation, Misfire VIN: 1GCJC39G32
Hi everyone, thanks for taking the time to help me out. This truck is primarily used to tow RV's all over the country. This thing will exhibit a misfire under load at or above 3500 rpm. When this occurs, the motor makes a vibration noise similar to a heat shie... Trouble codes: P0300
2002 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC524X2
I replaced an ignition swithch on this vehicle per customer request for some electrical problems I could not verify with the warning lights on the dash would come on for no reason. I replaced the switch and now the car wont start.It cranks over but the injecte... Trouble codes: U1000 (class 2 data malfuntion), U1064 (lost BCM communication), P1626 (theft deterent)
2002 Chevrolet Malibu 3.1L Poor Fuel Economy, low power VIN: 1G1ND52512
Hi, I am haveing a prob. with low power under load and at cruise speed. Also is getting very poor fuel mileage. Owner put in new plugs and wires. We checked plugs and gapping, all ok. Car has no codes. No vacuum leaks. We replaced the fuel filter and fuel pres...
2000 GMC Jimmy Diamond Edition 4.3L Breaks up VIN: 1GKDT13W5Y
After intake gasket repair. truck was skipping, we did fuel injection cleaning, seemed to straighten out. Customer took and brought back next day says couldn't go over 2500 rpm. we have hours into this and can't figure out. idles ok, as soon as you rev up to 2... Trouble codes: P0339, P0340
1990 Oldsmobile Cutlass Supreme 3.1L No Start, Stall VIN: 1G3WH54T3L
Customer had engine replace with a used by a "podna" and hasn't run since. Old engine spun a rod, knocking bad. Engine was replaced over a year ago. They got fed up with podna taking so long, so it's mine. It will start if you hit it lucky and don't touch the ...
1999 Oldsmobile Alero GL 2.4L Surge, Cuts out, Misfire VIN: 1G3NL52T7X
Hi,everybody i have a crazy one on my hands.no codes has interment misfire under load when cold mainly.parts as listed have been replaced twice to conferm part were good.I have tested fuel presure,at modual i tested crank sensor & module out puts,tested cam se...
2001 Pontiac Aztek 3.4L abs VIN: 3G7DA03E61
Hi iATN, I have a 2001 Pontiac Aztek in for ABS light intermittently coming on. I pulled a history code C0040 RF WSS CIRCUIT MALFUNCTION. I have checked all connections, WSS resistance and WSS A.C. voltage. All test show the sensor is okay. I have had other in...
2004 Pontiac Sunfire SE 2.2L no compression VIN: 1G2JB12FX4
died while driving. cranks fast and wont start. oil is very nasty but full, and feels ok. Removed valve cover to look at cams all seems to be in place and oiling fine. removed plugs for compression test all 0 psi dry or wet makes no differents. The engine show...
2002 Saturn SC2 1.9L compressor clutch VIN: 1G8ZY127X2
This Saturns A/C compressor clutch is PCM/BCM controlled. while monitoring BCM data, the A/C request will go from no to yes when the A/C button is depressed. This indicates that the pressure switch is ok as it is in the circuit between the switch and the BCM. ...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick LeSabre Custom 3.8L Poor Idle Quality VIN: 1G4HP52K4W
Thanks for all the replies. This one had me stumped. All it was is a bad IAC. When I was doing my original checks I thought by unplugging the IAC that it should idle low if it was bad but yet with it unplugged the idle still climbed. I still do not understand ... Trouble codes: P0300 (Random Cylinder misfire).
1996 Chevrolet K2500 Suburban LS 7.4L No Start VIN: 3GNGK26J8T
Thank you all for the replies. The problem was with the distributor. The drive gear was totally worn out...allowing the timing to be off. You were a great help. Bob [...]
1997 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY22GSV
I thank everyone who tried to help ,I spent many hours trying to reduplicate the problem,we ended up putting an ignition switch in and the problem never reoccured. The customer brought it back for a fuel gauge problem (sending units) has not had a problem sinc... Trouble codes: P0134 (low ho2s activity), P0135 (heater circuit bank one sensor one), P0141 (heater circuit bank one sensor two), P0155 (heater circuit bank two sensor one), P0161 (heater circuit bank two sensor two).
1997 Chevrolet Venture 3.4L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, Poor Fuel Economy VIN: 1BNDU06E3V
The no.1 injector had a ohm reading of 11.6 at the wiring harness but only 1 ohm at the injector harness. After unplugging the first connector at the computer where the injector wires are connected nothing happened. I the unplugged the second connector at the ...
1999 Chevrolet Express 3500 5.7L Misfire VIN: 1GCHG39R9X
turned out to be a weak valve spring on #1 cylinder. The fluctuation in the vacuum gauge was the clue. Even though it was very slight so was the miss. thanks for all the help Trouble codes: P0300 (Random Missifire).
2001 Chevrolet Impala 3.8L a/c VIN: 2G1WF55K81
we actuallyhave not fixed this car, becausethe local police department dicided to scrap the vehicle. beats me i am going to try and buy it at the auction. we believe it to be the bcm , we have inp but no output when it is acting up. thanks for all the help
2001 Chevrolet Impala 3.4L Body Control Module VIN: 2G1WF55E61
Thank God for friends like you guys! A special thanks to Paul [...]. This morning I decided the best approach would be to focus on theft relearn p...
2004 Chevrolet Silverado 1500 5.3L transfercase VIN: 2GCEK19T94
Thanks to everyone that replied,I got very useful information.One reply was about being cracked,well it actually had a hole in it on the right side of the rear half.What I did was split the case and seperate it in the truck cleaned it off then rv sealant.the h...
1991 GMC Safari SLE 4.3L Hesitation, Surge VIN: 1GKDM19Z8M
Thank you for the replies, sevral said EGR problem, I forgot to mention that I had tried disconnecting the EGR with no improvement. Sevral said secondary ignition problem, that seemed to be the answer. I replaced the distributor cap and rotor and also replaced...
2000 GMC C3500 Sierra SL 6.5L Hydroboost/brakes/steering VIN: 1GDKC34F7Y
As many suggested, replacing the powersteering pump has restored both the brakes and the steering. Thanks to all those who replied. Tom
2003 Pontiac Grand Am SE 3.4L No Start VIN: 1G2NF52E93
well this one made me go back and recheck everything aagain from the begining. what i found was that after the car ran for about an hour i was checking fuses in dist. box and tapped the fuel pump relay, seconds later the car shut off and would not fire again. ...
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