GM Automotive Technicians Technical Discussion and Fixes for Jul 18, 2007

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	Help Request	Answers
	1997 Buick Park Avenue 3.8L anti theft VIN: 1G4CW52K5V The customer originally had this car in for the air bag light being on, that turned out to be the BCM, which was completely dead, no functions, no communication. Replaced the BCM and programmed, everything works good. Now the car intermittently has a no crank ...	View
	1994 Cadillac DeVille 4.9L Surge, Misfire, Poor Fuel Economy VIN: 1G6KD52B8R Customer concern is engine miss at light cruise at 47-48 mph. We have replaced all spark plugs, wires, cap, rotor, performed upper intake and fuel injection service & replaced all injectors, and even replaced torque converter to no avail. All systems check out...	View
	1997 Cadillac Seville STS 4.6L obd monitors not on VIN: 1G6KY5295V this vehicle came in to our shop with failed emmisions and obd2 was not in ready mode, 02, 02 heater and catilist moniters are not ready. i have taken the vehicle through the drive cycles several times and allowed vwhicle to cool but the moniters remain not re...	View
	1997 Cadillac DeVille 4.6L compressor VIN: 1G6KD52Y9V Car came in with no cold air complaint. Compressor not engaging. Found bad high side temp sensor, code b1312, replaced open sensor, cleared all modules, no compressor engagement. No trouble codes. System is full of freon, can blow cold air if I bypass relay an...	View
	1999 Cadillac DeVille 4.6L engine VIN: 1G6KD54Y4X Hello all, I have a north star cadillac that I am trying to seal the oil pan on. We're reassembling now and I am not at all comfortable with the torque specs in the info I have. We're replacing the plate with the oil pan as advised and this requires removal of...	View
	1995 Chevrolet C1500 5.0L poor pedal feel VIN: 1GTEC14H9S Hello Group, We have this 95 c1500 2wd with a spongy low brake pedal application. We have dead plugged the master, resulting in a hard pedal. We dead plugged the exit lines from the 4wal system and had a hard pedal. Once the front is hooked back up, some of t...	View
	1996 Chevrolet Corvette 5.7L Clutch VIN: 1G1YY3254T After 1000 miles since clutch replaced, car has come back with a hard / impossible to shift. I get the car in and you cant shift it into any gear with it running. Shut it off and its fine. Acts like your not pushing the pedal down enough. The weird thing is th...	View
	1997 Chevrolet C1500 5.7L Cuts out VIN: 1GBEK19R8V ive been messing with this truck for two days off and on-when you gradually give it gas under load or in nuetral it will rev up fine-when you take off from a stop or rev it up fast it labors to rev up and has no power whatsoever-you imediatly think it has a pl...	View
	1998 Chevrolet S10 LS 4.3L Poor Idle Quality, Misfire VIN: 1GCCS19X0W came in with a random misfire replaced plugs, wires, dis cap and fuel filter left and it was all right. came back it set a p0300 and we could see it was misfiring on 1,3,5. we did 2 injectors drove for awhile was misfiring again 1,3,5. we than put a dist. on i... Trouble codes: P0300 (random misfire)	View
	1999 Chevrolet Blazer 4.3L a/c VIN: 1GNDT13W6X hey folks,i am at a loss with this thing!when the ac is on it still blows hot air no cold at all,we have replaced the heater control and both sensors in the air ducts and still nothing.by the way it has the computer controled climate system.any ideas would be ...	View
	2000 Chevrolet Astro 4.3L speedo odometer VIN: 1GCDM19W5Y here is what i got... the speedo doesn't work (stays at 0) & the odometer and the prndl do not light up. on my red brick, i can see vehicle speed and the gear position and both read properly. on the plug that connects to the speedo, all power and grounds seem ...	View
	2002 Chevrolet Tracker ZR2 2.5L a/c electrical system, VIN: 2CNBJ73462 customer said that when they turn the a/c on, the right turn signal starts blinking fast and short, 4x4 indicator light starts flashing, and a/c does not come on. when tech began to investigate, a/c worked fine for 20 minutes, then acted up as customer had ind...	View
	2003 Chevrolet Suburban 1500 LS 5.3L heated seats VIN: 3GNFK16ZO3 Drivers heated seat comes on by itself. Replaced heater switch, problem remains. Inspected wiring from drivers door module through door to fuse block, looks good. Scanner readings indicate heater request on and off. Looks like a bad drivers door module but is ...	View
	2004 Chevrolet Silverado 2500 HD 6.6L sulfur odor from exh VIN: 1GCHK23104 Help G.M./diesel techs! This customer complains when towing heavy loads he is starting to get a strong sulfur smell that has not happened before. He has owned it since new,uses cheap fuel and vehicle has no other drivability concerns/no check engine light. Any...	View
	2004 Chevrolet Silverado 1500 4.3L starter no crank VIN: 1GCEC19X14 I havent dug to deep just enough to check all my wiring leaving both fuses that it blew. The ing. 0 fuse and ign. b fuse where blown upon arrival from wrecker, no comm. with n e of the moudules. Found blown fuses both, truck started up and had two tcc codes an...	View
	2004 Chevrolet Trailblazer LS 4.2L Hesitation VIN: 1GNDT13594 vehicle ha snew fuel filter and shows good fuel pressure. no codes in computer. runs very rough at any spped witrh tank at 1/4 tom 1/2 full.	View
	2004 Chevrolet Cavalier 2.2L engine VIN: 1G1JC52F14 I am not sure what is gooing on but could use some help.. customer left key on had tojump start..drove for awhile then shut off..would not restart after that...spins but sounds like a car with a broke t-belt...any in put woould be great, not real sure were to ...	View
	1989 Oldsmobile Cutlass Supreme SL 3.1L Surge, Cuts out, Stall VIN: 1G3WS14T1K this car starts ,runs and acelerates fine when cold .the minute it warms up it wont accelerate. found the main fuel line at the tank twisted and kinked replaced line pump and filter . no change.also i can play with the throttle and when its back to rest map is...	View
	1992 Oldsmobile 98 Regency 3.8L Stall, Misfire, MIL Lamp on VIN: 1G3HY53LON We orig got this car in for a bad crank pulley, and misfire. We replaced the balancer and crank sensor. To fix the misfire we replaced the coil pack and module. The car left running fine. The customer drove it for 3 days then it started missing under load, ses... Trouble codes: 42 (esc failure)	View
	1996 Oldsmobile Achieva SL 2.4L security VIN: 1G3NL52TXT This Olds acts up once a day or as little as once a month and it has had the new ignition lock cylinder and key. and the new recalled harness to the lock cylinder and a new ac delco computer. Very randomly it will start and die and security light will flash. M...	View
	1998 Oldsmobile Cutlass GLS 3.1L MIL Lamp on VIN: 1G3NG52M2W Have vehicle with code 1641 and have no info on code, vehicle runs good only complaint is mil on and poor fuel milage. As I have no info on code(searched archives) I dont know where to go from here. Could the new ignition switch have set this, I did have to pr... Trouble codes: 1641 (no def found)	View
	1998 Pontiac Grand Prix SE 3.8L tcc VIN: 1G2WJ52K3W Vehicle came in with 0742 fault. Trans oil had never been serviced and was very dark, almost black. Changed filter and flushed system for clean oil thoughout. during road test and watching TC slip, had to much slipage on clutch. Replaced the TCC solenoid. Road...	View
	2000 Pontiac Bonneville SE 3.8L Cuts out VIN: 1G2HX54K4Y Engine cuts out and back on very rapidly and SES light flickers. Charge battery above 13 volts and it runs fine. Unplugged alt. and it was worse. Tech 2 will not communicate while it is running bad. Scan data is otherwise OK. 5v @ sensors remain constant. New ...	View
	2001 Pontiac Aztek 3.4L windshield wipers VIN: 3G7DA03E61 When the wipers are turned on the linkage moves 1/4 inch and that's it. Obviously, the fuse is good, but I learned the wiper module contains an internal circuit breaker which I believe is the culprit. I have power and a ground to the motor, but without a wirin...	View
	2003 Saturn Vue 3.0L gauges VIN: 5GZC263136 Not sure where to start on this vehicle came into the shop with the abs light on, brake light on, service light on, service engine light on, no fuel gauage, no coolant gauge, no tach and speedometer. If you flash the high beams they come on but no indicator on...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1998 Buick Park Avenue 3.8L pass. doors VIN: 1G4CW52KXW Scott from Canada nailed it on the head. The door lock mechanism on the door latches were seized in the lock position. Doused the inside of both doors with wd40 and I was able to work the lock rod loose on the rear door. The front door also had a seized doo...	4
	1987 Chevrolet S10 2.5L No Start VIN: 1GCBS14EOG I had many replies some of which said to check what I had previously stated. But the 4 people nailed Harold [...] all deserve mention. Coil ohms good but after I had tried everything else I replaced coi...	13
	1995 Chevrolet Blazer 4.3L Misfire, MIL Lamp on VIN: 1GNDT13WXS thanks to all who responded. This vehicle i believe has a weak valve spring. All the checks to the egr valve showed ok, fuel pressure drop was solved with a new fuel pump assembly,checked sensors, distributor shaft, and intake leak ckecked ok but still has mis... Trouble codes: P0300.	26
	2000 Chevrolet Astro 4.3L abs VIN: 1GNEL19W7Y Thank you again iatn members. 8 e-mails and 3 of them were right on the money. There was a small rust flake under one of the sensors causing the abs sensor pattern to cut out at low speeds. Pulled both sensors out, filed the mounting flanges smooth and it work...	8
	2003 Chevrolet Impala 3.4L oil pump VIN: 1235885698 Thanks guys for your input on this. We sold many of these GM cars with this motor and got worried about it. I spun the motor over W/a rachet and checked the cam. Lookes 100 %. Odd enough I took the filter off and cut it apart. 1 single piece of metal found, bu...	6
	1995 GMC Sonoma SLE 4.3L Misfire VIN: 1GTDT19Z8S This truck is fixed. Turnes out as the control module heated up, it would begin to misfire randomly. A new module fixed this truck. Several suggestioned a vaccum leak, so we tested it with a smoke machine and found nothing. As for the clutch, the customer ...	8
	1996 GMC C3500 Sierra SL 6.5L No Start VIN: 1GTHC33F0T Well the customer is unable to afford the parts right now so I'm still waiting to hear from them.As soon as they can afford it we are going to put a PMD cooler on it and see how it goes thank you for all of you guys' help it is greatly appreciated Trouble codes: 236 (Boost Sensor 1 Out of Range).	7
	1992 Oldsmobile 88 Royale 3.8L Park Lock Pawl VIN: 1G3HN5312N The car is fixed! Most of you Guys called it right. The crimp/rivet at the end of the park actuator rod was worn off causing the trans to stick in park. I was able to repair the trans without removal. I just lowered the sub frame down on the left side enough...	8
	1994 Pontiac Grand Am GT 3.1L MIL Lamp on VIN: 1G2NW55M4R After cheching all grounds and power supplys and scoping the TPS and finding no problems,I replaced the trans range sensor and had no luck. I took the car back to the tranny shop and they found a defective sprag and marginaly good shift solonoid pack. Being ou... Trouble codes: 80 (Trans. component slipping), 77 (EGR solonoid).	8
	1997 Pontiac Grand Am SE 3.1L No Start VIN: IG2NE52M3V This car is fixed. Turned out to be the ignition switch.The way that i found the problem was i had the key on and unplugged the lock cylinder and the thift light started flashing so that was telling me the security system was working. So i tested the ignition... Trouble codes: P1629, Z21, Z23, Z28.	14

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