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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 10, 2005
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Open Help Requests for GM
Help Request Answers
1987 Cadillac Brougham 5.0L AC and Heat VIN: 1G6DWS1Y4H
Hello Techs,I can use your help on this one. Customer brought vehicle in to fix the heater blowing cold.We checked vacuum to heater control valve, none found,smoke tested vacuum line,leak found at plug on the vacuum unit under dash.Repaired vacuum leaks.Replac...
1994 Cadillac Fleetwood 5.7L starts and stalls VIN: 1G6DW52P2R
this car starts up then it cuts off in 3 seconds the pass-key light stays on when the key is off. the anti theft relay must be working the starter engages every time the car has code #46 i`m thinking of changeing the central control moudule thanks nick Trouble codes: 46 (pass key)
2005 Cadillac STS 3.6L keyless start VIN: 1G6DW67785
my question is has anyone come across an EMI problem with garage door openers causing the remote keyless function not to work inside the customers garage.The system works perfectly outside the garage. We have installed the lastest part for the RCDLR. Has anyon...
1988 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions, Cuts out, Stall, Poor Fuel Economy VIN: 1GCDC14K3J
hi guys. trying to help a friend out at another shop w/ a problem child. this truck came in w/ a spun bearing. he put a crank kit in it and found out that it was actually a 305 engine. this shouldn't have been a big deal, but when he fired it up, it almost imm...
1995 Chevrolet Blazer 4.3L no 1st gear
Hi all . this vehicle starts in 2nd gear and sometime starts in 3rd gear,but never 1st. after the start it seems to up shift normal.i can command 1st gear on the scanner and it works fine.while looking at the data stream , the prndl is recognized properly by t...
1995 Chevrolet K1500 5.7L ring and pinion alignment VIN: 1CNEC124JK
Hello everyone, I am in need of your help. I have this 95 Z71 1500 w/lift kit on susp and body, it is giveing me some trouble in the rear diff. It came in a mess, new owner just paid alotof $ for this truck and it has been severely off roaded and abused. The r...
1996 Chevrolet W-4 350CID front calipers VIN: 4KDB4B1RXU
customer came in and stated that his bake pedal was going to the floor. so brought the truck in and checked out. this is one of those isuzu build trucks for gm. cab over style. found air in front calipers,suspected master cylinder. spoke to customer, he had ma...
1997 Chevrolet Venture 3.4L heater core VIN: 1GNDV06F4V
Hello everyone, I have got an interesting one here. We replaced the heater core in this venture van with a napa unit once, but Tedeschi Auto repair has replaced this heater core 3 times in the past 2 months with ac delco units.Needless to say, the heater core ...
1999 Chevrolet Tracker 2.0L 4x4 light VIN: 2CNBJ13C9X
the only problem is the four wheel drive light will flash constantly in four wheel drive high or low. four wheel drive engages fine and works properley. replaced the pcm and four wheel drive pump motor and it does the same thing.
2000 Chevrolet Suburban 1500 LT 5.3L Excessive Emissions, Misfire, MIL Lamp on VIN: 3GNFK16T3Y
Help!!! I've got this suburban that shows misfires on #1&6. I've checked backpressure and found none. No regulator leaking. I've swapped coils and wires. All injectors drop same pressure. Mis only happens between 2000 and 3000 rpms. The only way i know theres ... Trouble codes: P0300 (p0420-), P0420 (p0430-), P0430 (testing and results)
2000 Chevrolet Corvette 5.7L electrical VIN: 1G1YY22G7Y
looking for labor time to replace engine wiring harness i have been unable to find the time through any of my resources. tried alldata, chilton and identfix direct hit no one has labor time for full harness replacement in engine compartment. this car had a bat...
2001 Chevrolet Impala LS 3.8L temp guage VIN: 2G1WH55K91
temp.guage not functioning wiring appearsto be okay.scanner reads from temp sender looks to be acurate ,but no temp guage ,fuel guage also acts eratic at times .is there any tests to verify that it is instrument cluster ? service engine soon lite not on ,but c...
2003 Chevrolet Avalanche 1500 5.3L Axles, brakes, shafts VIN: 3GNEC13T43
We have a scraping or whooshing noise on every revolution of something. It sound like it is coming fom the rear. We found a TSB that decribes the noise to a T. TSB # 02-05-002A for noise from the parking brakes. We did the TSB and the noise is still there. We ...
1996 Geo Tracker 1.6L no power
Hello all, i hope some of you can help us here, i am getting this from another source, i will post more info later, anyways, this vehicle will only go about 2mph, even with the exhaust off,sitting on the floor in the shop, runs the same, installed the motorvac...
1990 GMC C3500 Sierra 7.4L alternator VIN: 1GDJC34N1L
Hello Techs. This GMC truck has a problem of distroying the alternator front bearing or pulley over a matter of a month to a year. Five alternators have been replaced on this vehicle all rebuilt 105 amp units. Alt belt lenght has been chacked 97". Engine has n...
2000 GMC Savana 3500 5.7L battery light VIN: 1GDJG31R6Y
customer doesn't like to leave the truck long enough for a detailed diagnose, so we were just throwing parts at it. The battery light flickers, but not on steady, in the instrument panel, usually at low idle when it is raining or when following a car on the hi...
1989 Oldsmobile Cutlass Supreme SL 3.1L Surge, Stall, MIL Lamp on VIN: 1G3WS14T1K
Car surges at idle sometimes and stalls when put into gear or when stopping. Exhaust smells very rich, and fuel trim is pegged low. Block learn sits at 100 with Integrator ranging from 87 to 103 or so. Same at idle or cruise. However, when accelerating, Integr... Trouble codes: 45 (rich exhaust)
1989 Oldsmobile 98 Regency Brougham 3.8L MIL Lamp on, Code 44 VIN: 1G3CW54C3K
Looking for help solving a code 44 lean condition at idle. IAC counts are 13 engine warm in park. LFT and SFT are both 150 in shop idling warm engine. Coolant sensor shows 205F at idle. Vehicle runs great idling and down the road. Only complaint is MIL light o... Trouble codes: 44 (Lean Exhaust)
1990 Oldsmobile 98 Regency Brougham 3.8L No Start VIN: 1G3CW54C3L
Car came in for HARD Start No Start Cold. If it gets below freezing you have to plug car in for an hour or so and it will start. But Starts hard. Bucks a little then fires and runs GREAT for the day. Gets cold, Same thing. Replaced Plugs and will try again in ...
1991 Oldsmobile 98 Regency Elite 3.8L starts in 3rd, VIN: 1G3CW53L3M
installed new turn signal and now transmission won't upshift,I checked everything I did and can't see anything that I would have done. I do see that the brake says that it's pressed. I unhooked brake switches and checked them and they checked out.The brake lig...
2001 Oldsmobile Alero GL 3.4L Radio VIN: 1G3NF52EO1
Hi all. Ive got a 2001 Alero that has the radio antennae in the back glass along with the rear defroster grid. My problem is that when the customer turns on the rear defroster the radio gets a lot of static in it, only on FM. Reception is great otherwize. The ...
1996 Saturn SL1 1.9L Excessive Emissions VIN: 1G8ZH5282T
OBDII emissions failure. P0172 and P0133. But no MIL on dash. Bulb check (KOEO) ok. SO Microscan shows MIL command "on" but MIL is not on (dash)? All monitors set except cat (because of 02 code). Pop the hood and found a leading o2 with a "butt" connect... AH-...
1998 Saturn SL2 1.9L Poor Idle Quality, Misfire VIN: 1G8ZJ5275W
car driven by used car lot for several weeks, parked a few days. Started with an obvious misfire. Several codes including misfire. Cleared codes and misfire code came back. Found plugs fouled and replaced. still misfire. Found cylinders 1 & 4 to have no spark....

Fixes & Summaries for GM
Fix/Summary Answers
1992 Buick Century Custom 3.3L abs module VIN: 2G4WS52J42
thanks for all the help. unfortunately we never found any bad grounds. after four days of looking we sent it to the dealer. i guess you can't fix them all. thanks from [...]
1997 Buick Century Custom 3.1L Poor Idle Quality, Misfire, MIL Lamp on VIN: 264WS52M3V
Thank`s to all, We were all on the same page. Tore down engine, Nothing visibily wrong with Cam, Lifters, But the Piston had lot of blow by(worn). Even with new and old Cams side by side couldn`t see anything wrong. Deglazed cylinder reringed, replaced cam, li... Trouble codes: P0300.
2002 Cadillac Escalade 5.3L stability system VIN: 1GYEK63N82
I listed the 5 signals required in my update that the stability system must see to turn on the light and disable the system. as mentioned the light comes on when the vehicle hasn't even moved thus eliminating 4 of the criteria for disableing the system. we rep...
1993 Chevrolet C1500 Cheyenne 5.0L Excessive Emissions VIN: 2GCEC19H1P
Hello everybody. Well we have fixed the emission problems with this '93 Chevy pickup. It turned out to a faulty EGR valve opening too soon/too much, causing loss of fuel control. Once replaced it passed the IM240 without any problems. One puzzling thing is the...
1993 Chevrolet Astro 4.3L abs VIN: 1GHR34AZBZ
What a pain i had air traped inside the abs unit here is what i did i presure bleed the master then opened the internal bleed on abs unit and then held down the brake pedal a pushed the reset valves in on the bottom of the unit and bleed at the bleeders on the...
1995 Chevrolet Lumina APV 3.1L Surge, Misfire VIN: 1GNDU06D8S
ordered a another dist. and replaced van runs good pick up had small crack in it the for the help
1995 Chevrolet Suburban C2500 5.7L parasitic draw from hell
Well, the big SUBurban is fixed!! I would like to thank all that responded,Especially BIG Bill [...], two very smart,(SEASONED) techs who got me thinking. They asked me if it had any add ons...Well I do know to always look for EXTRAS first bu...
1997 Chevrolet Cavalier Z24 2.4L timing chain VIN: 3G1JF12T7V
replaced timing chain tensioner. have not heard back from customer, so its good. thanks for the help.
2000 Chevrolet Express 3500 7.4L tcc.slip VIN: 1GCHG39J1Y
Thank you to those who responded to this post.Replacing the torque converter repaired this problem.After replacing converter slip speed was at 0 rpm.
2001 Chevrolet Silverado 2500 6.0L Torsion Bars VIN: 1GCHK24U81
Thanks so much for everyones input The majority of you agreed with just adjusting the stock bars. So that's what we ended up doing, and everything seems to have turned out great. also thanks to everyone who recommended timbren.com it will definitely prove usef...
1997 GMC K1500 Sierra SL 5.7L steering wheel VIN: 2GTEK19R7V
After getting the truck back, I proceeded doing an alignment to it again and changing the caster angles to 2.5 degrees like suggested in some of the Help E-mails I received. This changed nothing though. So, after that we installed an aftermarket steering stabi...
1998 GMC Safari SL 4.3L steering VIN: IGKDM19W9W
customer has not returned yet.i stongly expect the cure will be alignment related.i will repost if we do a final fix. many thanks for all the reponse.
2001 GMC Jimmy SLE 4.3L poor fuel mileage VIN: 1GKDT13W81
I believe from the responses I've gotten that I have an overfueling problem on this. Problem is getting truck long enough to fix. My help request is about to be closed and I don't have a fix for this yet, however I will update this when I do come to a conclusi...
1992 Oldsmobile Cutlass Supreme S 3.4L alternator VIN: 1G3WH14X7N
I will close this one as a fix, thANKS FOR ALL the help i just about used each suggestion to diagnose vehicle, most techs responded with a voltage drop test and i did that but anyhow when i got the vehicle after responses i checked for voltage drops when vehic...
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