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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 20, 2005
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1998 Cadillac DeVille 4.6L Starting VIN: 1G6KD54Y3W
Hello I'm working on a caddy that has an extended cranking problem on first start up. Things that I have checked are fuel psi-which is in spec. It also had a bad battery cable and end. Battery also tested weak,charged battery,also checked cranking amps from st...
1965 Chevrolet K20 350CID Model # VIN: K2545S1013
Hello have this 65 chev K20 4x4 need to know if anyone knows what transfercase is in the vehicle cannot find # on it did see a casting that said it was a rockwell need to know model # and if any one hase a exploded view of it, also if anyone knows if there are...
1984 Chevrolet Corvette 5.7L Lighting VIN: 1C1AY0788E
One of my techs has been trying to locate the diode module for the interior lamp system. Our component locator manuals, as well as our Mitchell On Demand, does not share this with us. 'Any one out there know its location on the car? Thanks in advance.
1992 Chevrolet Cavalier RS 2.2L no start VIN: 1G1JC1449N
please help gm techs, have cav tow to shop by customer, almost every part repl by customer and pals, no check engine lite, power and grd. good at ecm. order repl ecm part #[...] can not find any body to re-program repl ecm, gm dealer laugh have tech 2 and m...
1996 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13WXX
OK this one is killing me. This 99 Blazer is running extremely rich on cylinders 2, 4 & 6. The bank 2 sensor 1 is reading lean and not switching thus causing the rich condition. Have replaced the O2 sensor with no results. The Long term fuel trim bank 1 is -1.... Trouble codes: P0300 (Engine Misfire Detected)
1998 Chevrolet C1500 Cheyenne 4.3L Misfire VIN: 1GTEC19W5Q
hi techs this chevy is a strange one. it works perfect most of the time. some time underload in will multi misfire and most times it was #3 cyl. replaced spark plugs after trying a new coil and wire. costomer returned after replacing plugs and said it still ru...
1998 Chevrolet Astro 4.3L Power Steering VIN: 1GCDM19WXW
Vehicle entered shop with no power steering. Fixed leaking power steering pump. Note vehicle has hydro boost steering. After repairs, no power steering, brake pedal feels slightly hard. Checked pressure at pressure lines; seems ok. Need info on how to check hy...
2001 Chevrolet Monte Carlo LS 3.4L low tire light VIN: 2G1WW12E21
Hello, We are having a problem with this Monte.The low tire pressure light stays lit.All tires were checked and none are low.We have tryed to reset it with the light switch and the display on the radio.We cant even get the tire monitor to come up on the radio...
2001 Chevrolet Tahoe 5.3L low beams VIN: 1GNEK13T61
Hi all, this is aweird one . low beams are intermittant when on auto. may come on when you start vehicle but if you go to high beam then back they wont work. Once they are not working they wont work on manuel either. Shut the vehicle off and go in the store. r...
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S32
This one has a p0171 bank 1 lean. Fuel pressure is 54 psi. LT trim is at 20+ at idle.. I used the smoke machine 3 different times with no results.. Tried spraying down the intake, vac hoses, injector rail, t-body, etc. with no changes in fuel trim numbers. I a... Trouble codes: P0171
1991 Geo Tracker 1.6L No Start VIN: 2CNBE18U2M
i need help this is one of those cars that someone else couldn't fix. i have three of the basics to make this thing run except injector pulse. the computer has power and ground (according to alldata has no power or ground coming from ecm for inj pulse also ohm...
1992 Geo Metro LSi 1.0L Alternator Belt VIN: JG1MR3368N
Vehicle has CS144 type alternator. Owner of vehicle has had to repeatedly tighten alternator belt within a short period of time to prevent the belt from squealing on startups. Owner has tried several belts, last one was a NAPA replacement belt last week, but t...
1995 GMC C1500 Suburban 6.5L rear VIN: 1GKFC16F2S
truck vibrates at 68 mph can not isolate seems like rear of truck
1998 GMC Jimmy Envoy 4.3L Hesitation, Cuts out, MIL Lamp on VIN: 1GKDT13W9W
Engine 1 fuse blowing intermittent. Loss of tack, ses light comes on with codes for cam sensor, evap solenoids, and MAF sensor. Have had short last long enough to isolate to engine harness. Had all components unplugged and harness to rear of vehicle isolated. ...
2000 GMC Yukon SLE 5.3L low beam headlamps VIN: 1GKEC16T31
truck has no low beams, ck. for power at lamps (12 v), ck. for ground-not there,ck. ground signal from dimmer switch and it is sending out the ground, all data shows ground from dimmer going to daytime running light module/unit but has no location for this uni...
2003 GMC Savana 3500 6.0L No Start, Stall VIN: 1GJHG39U03
Hello, this van will cut off at anytime, sometime will go quite awhile before it happens. Dash lights stay on, but will not start when it cuts off. May happen a couple times in a row, then just start and be fine for a day. It sounds like a major connection som...
1996 Pontiac Grand Am SE 3.1L Stall, Anti theft system VIN: 1G2NE52M9T
Has anyone seent his problem? The mechanical and electrical protions of the ignition switch have been replaced. I also replace the PCM and updated the software in it. I was told it only has four parts to this system. The three I replace and a passlock control ... Trouble codes: P1629
1997 Saturn SW2 1.9L MIL Lamp on VIN: 1G8ZJ8277V
Ok, so this saturn came to us with the mil on, when we pulled the codes we got a ton, 25 to be exact. If you want to know them here they are: P0133,1624,1599,1133,1352,0506,0125,1628,1602,1508,1509,056 1,1641,1380,1555,0336,0326,1404,,0463,0507,0340,0572,0573,...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Chevrolet C3500 Cheyenne 5.7L Hesitation, Stall, MIL Lamp on VIN: 2GCGC39K7J
I went back and checked the distributor and found that it had a reman dist. and the magnet was different in design , so the ecm was seeing a different pickup signal. replaced the distributor shaft and everything was fine. Trouble codes: 44 (o2 sensor lean).
1991 Chevrolet Cavalier RS 3.1L No Power VIN: 1G1JFI4TXM
Thank you to everyone that wrote in. My customer is buying a new car now and wants to throw in the towel. I did find a bad injector, but replacing it didn't help. I think the crank gear may have turned on me. I know the timing marks are on because I put a chai...
1995 Chevrolet Corvette 5.7L Shifter interlock VIN: 1G1YY22P8S
Thank you for the replys. We did clean the button and rod at the top of the shifter because it had coffie and pop spilt in it. We also checked & lubercated the button and plastic piece that slides to push the rod. Still the rod was hard to push. I inspected lo...
1995 Chevrolet Monte Carlo Z34 3.4L Poor Idle Quality, Surge, Stall VIN: 2G1WX12X4S
Hello all and thanks to the four people who replyed to my email. I checked all over for vacuum leaks on this engine but none were found. I know that we had seen other 3.4 dohc engine with rolling idles and had the o2 was the problem but we couldn't understand ...
1995 Chevrolet Blazer 4.3L No Start VIN: 1GNCT18W3S
Thanks to all of those who gave suggestions. The fix ended up being a new crank sensor and harness combo GM PN# [...] or AC Delco 213-308. My suggestion is never replace the crank sensor without changing the harness. The harness looks perfect as does the co...
1997 Chevrolet K1500 Cheyenne 5.7L rear brakes VIN: 2GCEK19R2V
I received several good reply, but the customer has not returned for a fix yet, we will forward all the good replys to our memory banks,(heads) thank you
2004 Chevrolet Avalanche 1500 5.3L starter motor VIN: 3GNEC12T84
i think its time to let this sleeping dog lye.. thanks to jeff,aurthur,ted,richard, [...],rick,paul, dennis,dan,dennis,and laneard. you all say this is normal.i dont think your all wrong... from what i understand the pcm takes over the starting mode for the dri...
1996 GMC Sonoma SLE 2.2L Excessive Emissions, Poor Idle Quality VIN: 1GTCS1946T
Sorry for the delay on posting this but this one ate our lunch. After we finally gave up and sent it to the local chevy dealer and it was returned to us after a week with the response 'we dont know what it is but give us $200. I contacted the customer who agre... Trouble codes: P0108, P0107.
1988 Pontiac Sunbird SE 2.0L No Start, Poor Idle Quality, Stall VIN: 1G2JD11K3J
ok heres the deal. #1 this car is a mid year so wiring schematics are different,had to go to a 87 sunbird. after countless hours on the phone with snap on and gm tech support there is no reason why i cant communicate with this ecm. snap on claims its a protoco...
1989 Pontiac Grand Prix 2.8L speedo/odometer VIN: 1G2WJ14WOK
I removed the cluster and inspected all connections. All appeared OK. I was able to locate a used cluster (not my decision) and so far it has not acted up. I just hope I don't end up with a different concern down the road. Thanks to all who replied.
2000 Saturn SL1 1.9L starts & dies VIN: 1G8ZH5281Y
Thank you to all who sent in, you guys are great. David was right on with the passlock sensor. Kevin [...] Also nailed it and gave a great explanation of how it happened. very easy to understand. thanks again to everyone expecially IATN for this web site. No w...
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