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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 2, 2005
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1992 Chevrolet Corvette 5.7L Hesitation VIN: 1G1YY33P2N
customer has installed 3 different tps sensors,one factory, all had same # and logos, at idle tps is .45, at wide open trottle 2.85 to 3.0, butterflys are opening. 5 volt supply, ground good(even added ground no change). if anyone has experienced this or has a...
1992 Chevrolet G30 Beauville 5.7L No Start VIN: 1GAGG35K7N
Van will not start! There is no spark coming out of the coil. I have checked the wires from the ignition module to the computer and there are no breaks in them, every thing else has been replaced yet still no spark. According to the wiring diagrams there are 4...
1997 Chevrolet Express 3500 5.7L Intermittent braking
Hi all. Ive got this delivery van, the customer can only let it go for short periods. Sometimes when braking from hiway speeds the pedal goes down about halfway and it is apparent we only have rear brakes. After slowing approx 10 mph, the pedal feel changes an...
2001 Chevrolet Impala 3.4L Cooling fans stay on VIN: 2G1WFSSE61
I have a 2001 impala that the cooling fans stay on low speed and the ecm keeps alive for 3 min after the key is shut off. no other components seem to be alive. Is there a doide or an ecm problem doing this to me. Thanks in advance for any help. Trouble codes: P1189, P0128
2003 Chevrolet Silverado 2500 HD 6.6L speedometer VIN: 1GCHK23173
Speedometer needle jumped errattic while customer was driving, then pegged and stuck. Codes U1064 and U1041 both relate to loos of data communication. Odometer is working fine on 10 mile test drive and all other gauges working properly. Do I need replacement c...
1995 GMC Safari 4.3L MIL Lamp on VIN: 1GDDM19W15
Car came in with the check engine light on and code 32 stored. Replaced 02 for lazy response and for the fact that is was original then replaced prom with the updated one for code 32. Cleaned egr passage and replaced gasket with one with screen. The problem is... Trouble codes: 32 (egr problem)
1999 GMC Savana 2500 4.3L No Start VIN: 1GTFG25W3X
towed in flooded, crankcase equal mix of fuel and oil. changed plugs, new oil and filter. when trying to start vehicle backfires, fires randomly. any suggestions would be apprecieted. thanks Dave
2002 GMC Sierra 1500 SL 5.3L consumption VIN: 2GTEK19T02
Hi guys and gals. We have a customer that says he is adding 1 qt of motor oil every 250 - 300 miles. there is no smoke no leaks. the customer says he adds oil every time he fills up. thanks for any info.
1989 Oldsmobile Cutlass Calais 2.5L Hesitation, Stall VIN: IG3NL54U7K
Vehicle came from another shop, they put the plugs and wires on. Customer concern is that the engine will backfire through the intake and stall. Problem is very intermitant and only happens when accelerating from a stand still. I've noticed a hesitation almo... Trouble codes: 45 (Rich Condition)
1994 Oldsmobile Cutlass Ciera 3.1L Hesitation, Stall, revs limited VIN: 1G3AG53M3R
Good morning IATN fellow members. I got this old's that does not want to rev up over 4000 rpm. I have scanned it and I do have an egr solenoid code but I will replace it after getting this straightened out. This car apparantly works great when its cold but I c...
1995 Saturn SW1 1.9L cooling fan VIN: 1G8ZH8284S
We,ve got this Saturn that has strange cooling fan operation. Fan won't come on till temp hits 226. Then it doesnt cycle off again till 162. You can read fan request on scanner and it switches on and off at these temps. At 210 if you turn ac on ,fan request sa...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick Regal Limited 3.8L Dash lights VIN: 2G4WD14T1L
Thank you for your replies. Daniel from NH mentioned an Alldata bulletin Number 93818 that was very helpful. If this gray wire gets shorted it will take out the headlight switch with it. I found the fuse I had wired in had blown. Replaced the fuse and the ligh...
1994 Buick Regal Custom 3.8L No Start, Cuts out, Stall, dies when warm VIN: 2G4WB55L3R
sorry about the lack of info first time on site someone suggested spraying crank sensor with cold water and see if vehicle starts right up with sensor cooled off. it worked so we replaced sensor and everthing seems fine now thanks
2002 Buick Park Avenue Ultra 3.8L transmission VIN: 1G4CU54182
We Found That grommet in firewall for the trans shifter cable was missing. The noise we were hearing was normal, but was grossly amplified due to missing grommet!! Thanks for all responces.
1984 Cadillac Eldorado 4.1L Thermostat housing
WOW!! Thanks for all the GREAT replies. 15 of the 20 replies referred to a GM repair kit which was the answer and a real timesaver. A special thanks to Fritz. He gave me the GM part number 1628921 Many Thanks Mike
1996 Chevrolet Lumina 3.1L TheftLoc radio VIN: 2G1WL52M1T
Thanks so much to Daryn of Washington for the prompt reply and the right code. Since both #'s were the same I couldn't tell if the backup codes were right. There was no flash or anything between the two sets. Thanks to all who take their time to reply on this ...
1997 Chevrolet K1500 Cheyenne 5.7L transfer case VIN: 2GCEK19R6V
Thanks soooo much for the replys. The rear tail output shaft snap ring was broken. You guys were right on!! Thanks again, Kyle
2002 Chevrolet Silverado 1500 4.3L Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1GCEC14W82
Sorry for the delay in closing this request, things are crazy here. As quite a few of the replies stated it was indeed a clogged catalytic converter on the left side. I am disappointed in myself that I let that one slip. I thought it through after the fact and... Trouble codes: P0101.
2003 Chevrolet Trailblazer North Face 4.2L Fuse panel VIN: 1GNDT13S03
Fixed! Thank you all for the timely and accurate responses. We jumped battery voltage to one of the affected fuses, and the symptom disappeared. We examined the bottom of the fuse block, realized that the 30 amp fuse didn't feed the rows of other fuses directl...
2001 GMC Sierra 1500 HD SLE 6.0L Poor Idle Quality, MIL Lamp on VIN: 2GTEK69U71
i got in another tac module was not getting 5v on app 1. install tac and still no throttle response. load tested every wire on tac module with units disconnected and a halogen bulb to load test circuits. all circuits tested good. went to serial data circuits a... Trouble codes: P1518 (lost serial data between etc and pcm).
1990 Oldsmobile Cutlass Calais 2.5L Misfire VIN: 1G3NL54U9L
Hi guys, This one was customer's stupidity. Way too much injector cleaner trying to clear up a miss. Drained the tank, new plugs, and now seems just fine. Thanks everyone. Tina
2000 Oldsmobile Silhouette Premiere 3.4L level control VIN: 1GHDX13E6Y
thank you for all your help. the yellow wire from the fuse has a common with the rear quarter windows and the connection was bad right under the passenagers feet.
1993 Pontiac Bonneville SE 3.8L rear defogger VIN: 1G2HX53L6P
Thank you. The relay was behind the glove box in a panel. Found the relay was stuck on and burned off a wire behind the control panel. Fixed wire, replaced relay and all is well.
1995 Pontiac Trans Sport 3.8L MIL Lamp on VIN: 1GMDU06L5S
I received a few helpful replies, the one from Keith seemed to be on the right track, but we never were able to pin down the failure. In the end we had swapped out the computer twice, the ignition control module, all three coils, crank sensor, cam sensor, and ... Trouble codes: P0321, P1361 (IGNIITON CTRL TOGGLE ERROR Current Code), VAR10.
1996 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5279T
Hello everyone: I have fixed this car. According to some replies, GM put both a 'service engine soon'light and a 'check engine' light,(MIL) on some vehicles.The service light with the outline of a wrench in it, which was the issue with my car, comes on when th... Trouble codes: P0300 (Random missfire), P0303 (Cylinder 3 miss).
1999 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH528XX
Many thanks to all members who replied. I found out that the son is in high school shop class and some how they played around with a scanner and lost the memory. The reset procedure is to let idle for 2 to 3 minutes when the wrench light starts flashing raise ... Trouble codes: P1336 (CKP System variation not learned.).
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