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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 6, 2004
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Open Help Requests for GM
Help Request Answers
1990 Buick Century Custom 3.3L Steering VIN: 1G4ALS1N7L
Hello everyone we have a customer that has had this car since it was new and never had this problem before. What is happening is at idle when you turn the steering you get a kind of a moan or shutter that you hear and feel through the firewall/floor boards. If...
1994 Cadillac DeVille 4.9L Cuts out VIN: 1G6KD52B7R
When you put engine under load it acts like you have a rev limiter on it. Checked and found that half the injectors are cutting out from ECM. Still have the source voltage, but looses ground from ECM. Any help is welcome. Tried removing servo wiring at ECM and... Trouble codes: P0099, 1039
1965 Chevrolet corvette 350CID radio VIN: 194375S120
Does anyone have the procedure for removing the factory radio and dash speaker? As stated the car has factory a/c, I will be sending radio out for repair. The car is a hardtop if this matters with the removal.
1989 Chevrolet wcm31rq 454CID OverheatingEshaust m VIN: 1GBKP37W0J
Disasssemble engine for lack of performance and excessive blow-by. Replaced piston 5,7,& 6 because of missing ring landings. Honed all cylinders and replaced all rings. Heads and valves re-worked with new guides. Repalced rod bearings and oil pump as preca...
1996 Chevrolet S10 LS 4.3L No Start VIN: 1GCCS14X4T
Truck came into shop on hook. customer said he had gotten gas with water in tank but he had pulled tank and drained. after putting good gas in truck would not start. he then pulled timing cover & checked chain. he did not install new chain. I started testing a...
1997 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52M6V
This car is driving me nuts!! No spark cold only. When car does eventually start (when it feels like it) it is absolutely fine warm...until it cools off again, then no spark. Have crank rpm, fuel pressure, injector pulse, but no spark. No codes at all. Replace...
1999 Chevrolet Tahoe 5.7L rotors, VIN: 1GNC13ROXJ
truck came in low brake padel,inspected brakes and found leaking master cly,low brake lining,so we replaced master cyl,rotors,pads,shoes,truck keeps coming back in for overheated brakes,we have truck here on hoist,and we have no drag on wheels,we replaced mast...
2003 Chevrolet c2500 6.6L unknown VIN: 1GTHC24113
I have a 2003 C2500 truck with a 6.6 liter diesel in the shop that is giving us some problems. It initially came in for a LOF and a fuel filter. We changed the oil and replace both the oil filter and the fuel filter with WIX filters. The oil is 15W40. We have ...
1991 GMC K2500 Sierra SLE 5.7L brake light in dash VIN: 1GTFK24K3M
we installed rear brakes & rear wheel cylinders. after manually bleeding the brakes, we noticed the brake light in the dash was staying on. prior to our repair, there was no problem with the light coming on.
2003 GMC Sierra 2500 HD 6.6L Coolant Reservoir VIN: 1GTHC24173
Driver states that he had to stop and add coolant twice on a 65 mile trip. No visible sign of coolant leakage, none visible from exhaust and no bubbles in coolant bottle. I once heard that the EGR valve is water cooled and can leak into the combustion chamber ...
1999 Oldsmobile Alero GL 2.4L No Start, MIL Lamp on VIN: 1G3NL52T2X
Many codes found in the computer one problem is that we have to sublet out to communicate with the BCM our scanner doesn't have the capabilities. When we sent it out told that there was a bunch of codes but the car started. The biggest problem is the theft det... Trouble codes: P1630, P1631, P1626, U1301, U1040, U1064
1989 Pontiac Firebird 5.0L No Start, blows ecu fuse VIN: IG2FS2IF8K
ecu fuse blows on occaision but can blow three or four times in a row then work for a few weeks.
1990 Pontiac Grand Am LE 2.3L waste spark? VIN: 1G2NE14DOL
This vehicle intermittently has what appears to be ignition spark at the front crank pulley! More precisely 2 snaps at the 10 O'clock and 2 snaps at the 2 O'clock positions. No apparant misfire and no tach needle jump. Not familiar with this system; any ideas ...
1994 Saturn SL1 1.9L No Start VIN: 1G82H559XP
low ground voltage at tbi injector all tests point to pcm but pcm new great fuel pressure new wire run from pcm to injector no shorts. what tells pcm to increase ground voltage to injector?

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Park Avenue 3.8L Stall VIN: 1G4CW52LOR
I want to thank everyone for responding so quickly. I think the vehicle is fixed. I called the customer to ask him how it was doing and it turns out that he traded it off one week later after I had worked on it. He said it never stalled out any more , but th... Trouble codes: P0341.
1988 Cadillac DeVille 4.5L Excessive Emissions VIN: 1G6C05153J
Two of the replies I recieved suggested a ground problem to the ignition system. I ran an additional Ground from the battery to the ground wire coming from the distributor and this has rectified the problem. Thanks to all who replied.
1995 Cadillac Seville STS 4.6L steering VIN: 1G6KY5292S
techs : the fix after checking with 3-parts sources was able to purchase upper brg. strut plates,complete assm. each $ 800.00 used original struts. thanks to kenneth, so. calif.=richard minn.=juan so. calif. also iatn.
1971 Chevrolet Corvette 350CID wipers VIN: 194671S104
we would like to thank everyone for their help. Chris from Calif. sent us a wiring and vacuum diag. and we were able to fix the problem. Special note- even though we had voltage at the motor and pump the fuse was bad!!! Go figure!! Anyways the vacuum was off i...
1991 Chevrolet C1500 Cheyenne 5.7L AC vent doors VIN: 2GCEC19K4M
I read all your emails for the repair and all of you was right on the money, I replaced the rec auctor motor and fixed the clicking problem and the linkage for the ac vent was completly gone ,had to replace that and every thig works well, thanks to you all, th...
1997 Chevrolet Malibu LS 3.1L Surge VIN: 1G1NE52M8V
most you you that responded said sounds like an intake leak, so i redone the intake gaskets back side gasket was cracked rechecked after ,vacuum in crankcase and surge was gone thanks to everyone
1998 Chevrolet Blazer 4.3L Misfire, MIL Lamp on VIN: 1GNDT13W3W
I'm closing this one as the customer has driven it nearly 1 month with no loss of power or MIL lamp. As I indicated in the update, the Delco cap & rotor was the fix. The over-all recommended solution was to repair the exhaust restriction. I wasn't going down t... Trouble codes: P0300 (random misfire).
1998 Chevrolet K1500 Cheyenne 5.7L brake pedal VIN: 2GCEK19R2W
Customer has been out of town a lot and been unable to get the truck back to me. Most of the replies suggested to check for rust or debris on the wheel speed sensors as this can often cause pedal pulsation without setting abs codes. I plan on checking this out...
1998 Chevrolet Camaro 3.8L Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on VIN: 2G1FP22KXW
Sorry it took so long. I got really busy with hurricanes and such!!! Alot of replies said to check coolant temp sensor. I did as suggested. CTS ok. I also had customer exchange ICM from autozone. Autozone only tested it and said it was ok. But, I had already o... Trouble codes: P1361 (ic circuit), P1362 (ic circuit).
1999 Chevrolet Monte Carlo LS 3.1L Cuts out VIN: 2G1WW12M9X
I want to thank everybody for their help in this hair pulling problem. I fixed it by replacing the crank sensor. The scope I used wave forms were perfect after the car ran for an hour and a half. After tapping with a screw driver I finally found some breakage ... Trouble codes: N0NE.
2001 Chevrolet Silverado 2500 HD 6.0L air bags VIN: 1GCHK291E1
Fellowtechs: This truck is fixed, thanks to all who responded. 3 of the 4 replies said that the BCM/VTD needed to be reprogrammed to match the new SDM. This requires a Tech 2 and/or reprogramming capabilties. 1 response suggested a bad igntion switch, but that...
2001 Chevrolet Blazer Xtreme 4.3L MIL Lamp on VIN: 1GNCS18W31
Hi, Sorry for the delay but I thought the customer was coming back for repair but she declined repairs. Most replies mentioned fuses and locked up pumps but this pump was blowing plenty of air. There was some water in the pump so I suggested replacing the pump... Trouble codes: P0410 (Air injection system).
2002 Chevrolet P 30 CHASSIS 5.7L No Start VIN: 5B44P42R42
Thanx to all how replied fuel pump was problem installed oem pump and truck runs like new. Have to give a thumb up to this site and all the people on it. Have a good day!!
1991 Geo Prizm 1.6L internal VIN: 1Y1SK4569M
Seems as if you get what you pay for. (Junk from 'Junkyards')The 3rd tranny worked just fine. After getting numerous replies telling me to check the differential (had no idea the fluid was seperate from the rest of the tranny) I thought for sure that it would ...
1997 GMC Safari SLE 4.3L Hesitation, Cuts out VIN: 1GKEL19WXV
Many thanks to all who took the time to respond. Apparently this is not a common problem, and it is so intermittent that we have never experienced it and have very little data about what it happening. Possible suggestions are a faulty fuel pump, a piece of car...
1999 GMC Sierra 1500 SL 5.3L Brake Pedal VIN: 1GTEC19T8X
Thanks to all who responded. Most responses indicated possible problems with the wheel speed sensors. To date I have not had the failure manifest. GM TSB # 03-05-25-007A indicates inspecting wheel speed sensor mounting surfaces for corrosion or rust build up c...
1995 Oldsmobile Aurora 4.0L Engine surging, temp VIN: 1G3GR62C0S
I first inspected the engine wiring harness around the engine mounts and found no wires shorting to ground or pinched. I reinspected all the grounds and even did a voltage drop test on each one. After exhausting all other concerns, we sent vehicle to Oldsmobil... Trouble codes: 80 (Fuel system rich), 121 (A/C high side temp sensor problem), 73 (Intermittent cooalnt temp failure).
1999 Oldsmobile Alero GL 2.4L front end right side VIN: 1G3NL52T9X
finally, this vehicle is fixed without a front end noise!! thank you very much to all of those who said use oem bearings. we had purchased from a federated auto parts store aftermarket bearings back in april that we had installed. after much head pounding and ...
2002 Oldsmobile Silhouette Premiere 3.4L Differential VIN: 1GHDV13EX2
The replies I received were quick and to the point. There is a fluid breakdown issue with the AWD rear diff. units. I supplied the customer with the replies and they went to the dealership to confront them with the facts. As they have extended warranty on this...
1992 Pontiac Firebird Trans Am 5.7L remote door lock VIN: 2G2FV22P6P
thank you tony and david you were a great help the procedure is to ground pin g at the aldl the locks will cycle press lock button on remote program confirms by cycling locks remove ground thanks again guys you are great
1996 Pontiac Grand Am SE 2.4L Hesitation, Surge, MIL Lamp on VIN: 1G2NE12T6T
Well I went with the masses and replaced the O2 again only with a GM version this time. All appears to be fine to this point. Strange but I've used aftermarket parts on this model of car before with no problems. Thanks for the help Trouble codes: P0172 (Fuel System too rich bank 1 sensor 1).
1997 Pontiac Sunfire SE 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1G2JB524XV
Thanks to everyone for their replies. We had trouble getting solid data on this car. It came from another shop then set up for a while and then brought to us. The codes that we found where false codes from owner or previous shop unpluging sensors and so on. Yo...
1999 Pontiac Grand Am SE 3.4L fuel injectors VIN: 1G2NE52E3X
Thanks for all the help, runs great, customers very happy to have their car back! -W.W.
2000 Pontiac Grand Prix SE 3.8L air bags VIN: 1G2WP52KOY
well thanks to all that replied, everyone was correct, the clockspring is the fault, we didn,t think we turned the steering as we left the wheel locked but we must have slipped up some how. we installed a new spring with the wheel centred and all is good. it's...
2002 Pontiac Sunfire SE 2.2L air bag lamp VIN: 1G2J37TD88
No help on this one from IATN , but we did fix it .After checking class 2 data lope we found no bad connection between all modals when unplugged. We started looking at connectors more closely especially the air bag module we noticed one pin was slightly farthe...
1999 Saturn SC2 1.9L Poor Idle Quality VIN: 1G8ZG1272X
I had opened this help request for another shop. I am enclosing an email I got from the owner of the shop and the replys to the request. Thanks to all that gave suggestions. GCS Enclosure: Tried all remedy's suggested however it does appear to be a cracked...
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