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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 1, 2006
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1993 Buick LeSabre Custom 3.8L Master Cyl, ABS Controll VIN: 1G4HR5310N
This one has me stumped. We have replaced the brake system from front to rear basically, Its a high milage car but the customer loves it. We replaced the booster and master cylinder, It left the shop every thing was fine good pedal and good brakes. He came bac...
1997 Buick Park Avenue 3.8L air bag VIN: 1G4CW52K2V
SET THE TWO LIGHT ON. Airbag and Check Engine. No code for the power train. Found the cod only for the airbag, B1159 and U1255. I check the SDM connectors located under the passenger side seat. Connectors seems good. Should I replaced the SDM?
2002 Buick Rendezvous CXL 3.4L battery VIN: 3GBDB03E42
Hello everyone, i need some help here, this vehicle has a parasitic draw that seems to be evading me. it's seems to be related to fuse 48 in the underhood fuse block, that fuse feeds a few fuses in the center console fuse block. I've checked almost all of them...
1995 Cadillac Fleetwood 5.7L Surge, Misfire VIN: 1G6DW52P2S
vehicle brought in from another shop/shops,with alot of parts hung.after hot, engine misfires under load.at idle, when hot idle will flare up & surge. no codes. have scanned,when idle acts up iac goes to 160,maf to 19.00 grms/sec, with closed throttle.left & r...
1998 Chevrolet Blazer 4.3L 4x4 VIN: 1GNDT13W7W
Hello IATN. Working on a blazer that is being uncooperative.Customer [...] in with complaint that going uphill after driving a little while and unit is warm he gets a very loud and rough noise and vibration.If he stops and backs up it will go away.Also if h...
1998 Chevrolet K1500 Cheyenne 5.7L 1-2 shift hard VIN: 2GCEK19R1W
The truck came in with a very harsh 1-2 shift after driving the truck at least 20 miles, shifts normal before that. After about 20 miles the check engine light comes on and we get a code P1870. Then it starts to shift hard from 1-2 very hard and slightly hard ...
1998 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W6W
Hi techs, 2 weeks ago, this blazer was towed into my shop, crank but no start. Quick tap the fuel tank and it fired right up. Automatically we replaced the fuel pump and off the bay. 2 Days later, customer call in and said it would not start again. Hammer the ...
1999 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEK19T2X
Problem started with miss on #7. Cleaned Injectors and still had miss. Move injector 7 over to 5 and #5 started missing. Replace injector and thought problem was solved. At idle it shows no misfire but just slightly off idle it starts showing multiple misfire.... Trouble codes: P0300 (multiple misfire)
2000 Chevrolet Monte Carlo LS 3.4L No Start VIN: 2G1WW12E9Y
Hi All, I just got done replacing the lower intake gaskets on this car. I ran it for five minutes and turned it off. When I tried to restart it it would not start. I traced my steps from the repair and verified good connections and no pinched wires that I coul...
2000 Chevrolet Malibu 3.1L Electronic VIN: 1G1ND52J3Y
Hello everyone, I have a 2000 malibu that intermittant when a/c is on and in recir mode the light will switch to fresh and at times the a/c light will go off and on with compressor. All pressure is good and when system is working puts out 30-32 degrees at duct...
1993 GMC Sonoma 4.3L No Start, NO START COLD VIN: IGTCST9W9N
veh. will not start cold. replaced fuel injector assembly. veh. will start with brake clean. after starting once cold, veh. will start the rest of the day, until veh. sitting over night.
1996 Oldsmobile Aurora 4.0L stuck in 2nd VIN: 1G3GR62CXT
customer complaint is vehicle does not upshift after 35 mph. service engine soon light is on. test drove & confirmed that vehicle is stuck in second gear, seems like "limp-in mode". scan codes. P0758 present. performed tests for code, but could not manually/re...
1991 Pontiac Sunbird LE 2.0L Poor Idle Quality, Stall VIN: 1G2JB54K3M
this is my own vehicle so its driving me crazy...car will not start when cold, cranks, has spark, has fuel, wants to start then dies. when applying throttle vehicle will start and run, have to feather gas for a few seconds and then will idle and run normal. on... Trouble codes: 42 (electronic spark timing)
1998 Pontiac Firebird 5.7L a/c system VIN: 2G2FU22G9W
System has odd pressures. It acts just like an expansion valve system with the expansion valve stuck open. Low side too high, high side too low, but this is an oriface tube system. Cooling is poor, maybe 65 degrees even driving down the road. Both cooling fans...
2001 Pontiac Grand Am SE 3.4L wheel speed sensor VIN: 1G2NF52E21
help!!! this is my fathers car and i hate working for family. this thing keeps setting a code for rf wheel speed excessive variation. it started about a year ago and i replaced the wheel bearing assembly and all was fine for a week. then the light came back on...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY5499X
all 4 cams where off two teeth each. wow it ran good for the cams being off. I fixed the back cams and ran it and the fuel trims where off on the front bank so I know the front cams where off to. funny part is when I put it together the first time I checked th... Trouble codes: P0340.
1996 Chevrolet Astro 4.3L engine VIN: 1GKDM19W7T
apparently a lot of techs have not seen this one yet but a few had great ideas from removing sub-frame and lowering it out the bottom to cutting the core support out. GM sells a kit to re-bolt the core support back in after cutting it out. these models do not ...
1999 Chevrolet Malibu 3.1L a/c switch VIN: 1G1ND52MXX
Well, everyone that replied had the same response the a/c heater control head, which is apparently a common problem with these cars. Customer was advised of required repairs and didn't have the money at this time, so the old unit stayed and they will deal with...
2000 Chevrolet Suburban 1500 LT 5.3L ac pressure VIN: 3GNFK16T8Y
This one is fixed, i replaced the rear expansion valve with no success, still had bad high side pressure. I then got back to the basics. Let me explain that i installed the small inline filter i got from gm dealer after the condensor but before the high pressu...
2001 Chevrolet Silverado 1500 5.3L No Start VIN: 2GCEC19T61
thanks for all the help with this truck it turned out to be the elec. part of the key and tumbler which i wanted to replace frist but our locksmith talked me out of it but thank for everyones help again. Trouble codes: P1631.
2001 Chevrolet Blazer LS 4.3L 4wd VIN: 1GNDT13WX1
Thanks, to all who took the time to help. the problem was the switch assm. although it tested good by the book, it must have been just out of spec. Our gut feeling was the switch, but it was very helpful to have another head to scratch. Again thanks to all, Bo...
2002 Chevrolet Cavalier LS 2.2L cooling fan fuse VIN: 1G1JF52442
The cooling fan was shorted. Jose from Cali hit it on the head. Fresh eyes on the subject helped. Unplugged cooling fan and dead short went away. Resistance was 8 ohms and the new motor was 4 ohms. Looking inside the motor after removal showed burnt windings. ...
2002 Chevrolet Tahoe LS 5.3L spark knock VIN: 1GNEK13T82
fixed vehichle by soaking carbon with gm top engine cleaner over night. worked wonders. Next time i will check compression first and see if it is to high. Thanks to all. ed
2003 Chevrolet Trailblazer LS 4.2L Hesitation VIN: 1GKDT13S13
thanks for all the replies and for the phone call from John in CT. turns out we had a bad o2 sensor.it would go into closed loop at start up and stay in loop for about 2 minutes all the while hovering in the 400mv range.after 2 minutes it would go into open lo...
1998 GMC Savana 2500 5.0L abs VIN: 1GTFG25MZW
Customer declined any more money spent on vehicle. One iatn tech identified the brake system that we had with the proper codes. Sorry to say no futher information available. We wanted to replace the ebcm but had no proper way to bleed the system. Our genesis w...
1998 GMC Jimmy Envoy 4.3L Vent Tube VIN: 1GKDT13W2W
This one is fixed and out the door. After all all the help I got I found that the trans to transfer seal was bad completely over filling the transfer. I beleive this was caused by 2 things. One, when the customer had the trans flushed I believe they over fille...
2002 GMC Savana 3500 5.7L starter VIN: 1GTHG35R82
thanks to everyone who replied to my help message .found the problem to be a short in the ignition side of the switch.problem was between ignition switch to the crank fuse. we ran a new wire between ignition switch connector c-100 to crank fuse sent customer...
1995 Pontiac Grand Am SE 3.1L No movment in drive VIN: IG2NW55MXS
Customer declied work at this time. Thanks to everone for all the good information
1999 Pontiac Sunfire SE 2.2L a/c system VIN: 3G2JB5249X
thanx to all that replied , it ended up being the pressure switch was faulty even though to scanner said there was pressure ,the switch wasnt closing the curcuit.
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