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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 7, 2004
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
1996 Buick Riviera 3.8L MIL Lamp on VIN: 1G4GD2215T
this car came to us with the service engine light on. ran scan test and found code po341. i checked all grounds and signal wiring found nothing wrong. i ended up replacing the cam sensor. took car for test drive and light stayed off. the car sat overnight and ... Trouble codes: P0341
1991 Cadillac Seville 4.9L Hesitation, Backfire VIN: 1G6KS53B6M
Greetings Techs, Sorry for the Steven King Novel. It scares me! This one is in from another shop. After extensive system checks and digging through the archives I'm going to ask for some help :). What it will do is when the vehicle is cold and you step on the...
1996 Cadillac Eldorado 4.6L Climate control Display/Driver information center VIN: 1G6ET1291V
We have a weird one here! There is no illuminated display on the climate control head but it still works fine. You just can't see the green numbers or signs, also No information display on inst. cluster nor a tach signal, fuel guage or coolant signal. All othe...
1990 Chevrolet Corvette 5.7L Hesitation VIN: 1G1YY3387L
This car has had all injectors replaced at another shop and fuel system cleaned from being loaded with water.Came in from fuel cap vent valve...common I understand. It ran fine until yesterday when it suddenly lost power and started overheating and bogging dow...
1991 Chevrolet Cavalier RS 2.2L Speedometer VIN: 1G1JC54G6M
Vehicle speedometer will register only up to 13mph then stays there no matter how fast vehicle is moving,with scanner reading vehicle speed the reading is the same.proformed test on vss with vantage and all tests pass. replaced ecm with no help- did use old pr...
1995 Chevrolet Cavalier 2.2L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 3G1JC1246S
Hi guys You guys have never let me down yet even when I confuse myself. So Hopefully someone can point me in a direction .This car was taken in on a trade .It runs not bad off idle .But at idle it is loading up the fuel trim goes down to 80 from 128.the pulse ...
1997 Chevrolet C1500 4.3L drivability VIN: 1GCEC14WXV
Customer complaint: vibration in steering wheel at 1500 rpm During test drive w/scanner: no codes, no misfire, no history codes. With normal accel., vibration comes in when trans achieves overdrive & lockup, which happens to drop engine to 1500 rpm range-compl...
1997 Chevrolet Lumina 3.1L Stall VIN: 2G1WL52M6V
Hello I could use a little brainstorming. This car will hardly start and stay running. It will blubber, spit and sputter. Pop back through intake. But will run, but not well enough to move or anything. Like the timing is way off. According to Snap on Generic m...
1998 Chevrolet K3500 Cheyenne 7.4L Poor Idle Quality, Misfire VIN: 1GCHK33J5W
Vehicle has a rough idle, feels worse cold but still there warm. Misfires count up on cylinders 5 & 6 but doesn't set codes. Cylinder time balance at idle on cylinder 6 is -2%, cylinder 5 +2%, rest of cylinders around 0%,all cylinders near 0% above 1200 rpms. ...
1998 Chevrolet Venture 3.4L No Start, Poor Idle Quality, Stall VIN: 1GNDUO6E6W
Well here we go again. customer called with no start condition. after several tries they got started. started fine for several days. is becoming more often now.vehicle will start if you press on accelerator. with scanner attached mass air flow meter shows 1.92...
1997 Geo Metro 1.0L MIL Lamp on VIN: 2CQMR226XV
Hey all this one seems kinda strange misfire code cyl #1, while the light is flashing I feel no misfire. Vacuum gauge steady. EGR was leaking, but has been replaced. It was at the GM dealer for a couple of weeks they threw secondary ignition components at it n... Trouble codes: 0301 (Misfire cyl 1)
1991 GMC G2500 Rally 5.7L Poor Idle Quality, Surge, Stall VIN: 2GKEG25K7M
Hello,This van will not start cold unless the throttle is even slightly opened,after 30 sec. it will idle fine, then when it reaches 180o the idle will start to surge and eventually stall I have check for vacumm leaks,replaced IAC and vehicle has had a remaned...
1999 GMC Yukon Denali 5.7L Vortec unit leaking VIN: 1GKEK13R6X
We pulled the intake off to replace the leaking gasket. When we disconnected the electrical connector to the fuel injection unit we found it to be full of gas. This seem to be a common problem and can work its way back up through the wires to the computer. My ...
1998 Oldsmobile Bravada 4.3L Accessories VIN: 1GHDT13WW2
Hi we have this Bravada that the wipers wouldnt park, stopped anywhere they were, we replaced the motor and the wipers park great but the intermitant wipers react wierd for instance if the switch is on off and you move it to int (any position) they wont work f...
1990 Pontiac Grand Am LE 2.5L Hesitation, Cuts out, Misfire, BACKFIRE THROUGH TB VIN: 1G2NE14U4L
Hello fellow Techs. This one is about to drive me over the edge. I mainly work on Ford and Asian so I am at a loss. this one belongs to me so I have tried some "Shotgun Diagnostics." A day or so ago it started cutting out, back firing through the throttle body...
1992 Pontiac Grand Am SE 2.3L Excessive Emissions, Hesitation, Stall VIN: 1G2NE5439N
Hello group- I've read every fix post for this problem and have attempted and or verified each. Please read carefully. Much work has been done. Car had a bad fuel regulator. Replaced it and O2 sensor. Road tested well, but trim counts were still indicating ri...
1995 Pontiac Bonneville SE 3.8L Hesitation VIN: 1G2HX52KXS
The vehicle is operating in power management mode due to a cruise servo position error. Codes are P1568 & P1599.With the servo unplugged we had a servo position of 70% on our scan tool. It would at times drop to 35 or so for no apparent reason. Plugging it in ... Trouble codes: P1568 (cruise servo position), P1599 (cruise power management)
1999 Pontiac Grand Am SE 2.4L Hesitation VIN: 1G2NE12T4X
when u accelerate hard from a stop this vehicle "chugs" then catches up with itself. recently, while here the vehicle started to do the same thing with the trans in park also. really lost here. we've talked with a few of our affiliated shops and nobody seems t...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L Poor Idle Quality, Hesitation, Surge, Stall, MIL Lamp on VIN: 1G4HP52L3R
Thanks to those of you that responded. All recommendations I received were items already done but I failed to put in my original post. When you get vehicles like these you tend to lose tract of what all you have done. THE FIX: We replaced the customers replace... Trouble codes: 131 (o2 lean), 171 (fuel trim lean).
1990 Cadillac DeVille 4.5L No Start VIN: 1G6CD533OL
Hello, I was able to get proper vats ignition key and after replacing both lock cylinder and key car started fine. Thanks for the replies helpful information regarding vats systems. Thanks Again-John [...]
1992 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD53B8N
Replaced the oxygen sensor, adjusted timing & replaced the catalytic converter. Car passed test!
1998 Cadillac DeVille 4.6L compressor VIN: 1G6KD54Y2W
Another one that the customer did not want to follow through with, but thanks to all who helped, I could never be the magician of auto repair that I am without the support of iATN. Many offered the suggestion that pressure sensors or temp sensors were not corr...
1995 Chevrolet G30 Beauville 5.7L Surge, NO POWER VIN: 1GAFG35K1S
Thanks to all 11 techs who took the time to reply. I have delivered this vehicle 48 hrs now and i contacted the owner earlier and all is well, said its the first in a long time his fuel consumption was so low. The fix took more time than necessary as i had to ...
2000 Chevrolet S10 2.2L No Start VIN: 1GCCS1442Y
Hello Group,Well this truck is fixed.Found out more this morning about what happened.Seems the guy went through a corn field,then later shut truck off & it would not start.Raised up truck & found a small hole in neutral safety switch.This was the culprit!Mark ... Trouble codes: P1041, P1870.
2000 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS1451Y
Ron from British Columbia gets an above and beyond for sending the whole trouble chart on the reply. I must of missed it ( I'm an idot) because I went to a friends shop and got it. Thank you very much anyway. Ron from Idaho says check fuse in power centre if i... Trouble codes: P0410.
2000 Oldsmobile Alero GL 3.4L No Start, hard start/needs thr VIN: 1G3NL52E5Y
Thanks to all who replied. The problem turned out to be the main ground g102 on the left fenderwell.Note this is a splicepac,all appeared ok in pack but the bolt was corroded and the fender is painted with no star washer.Connection was tight so dont let that f...
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