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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 24, 2005
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
1986 Buick Regal T-Type 3.8L Brake Light VIN: 1G4GK4778G
Thank you guys in advance for the help. Customer brought car in with a new master and pump assy. We installed it at his request. He said he was having a low break complaint. After installing the master assy, bake light was coming on intermittly. Found a recall...
1993 Buick Skylark Custom 3.3L interior lights VIN: 1G4NVQ4N8P
vehicle came in for interior lights staying on, wont shut off and lights not going off w/ key on engine running. tested all switches and dimmer switch--all tested ok- replaced multifunction module w/ used one (discontinued part). lights go off after about 2 mi...
1994 Buick Park Avenue Ultra 3.8L Poor Fuel Economy, MIL Lamp on VIN: 1G4CU5216R
hey buick techs this is my own baby. If your a true buick tech. than you know this car is a half breed of obd1 and II. the QDM 1 controles the tcc lock up, the purge, and the boost circuit. the ses light has come on at 10 mph code and hot. come on at 40+mph. W... Trouble codes: P1640
1995 Buick Riviera 3.8L trans solinoid's VIN: 1G4GD22135
Ok hear is the hole story this car came to us with a customer complaint of a engine miss on accel. I test drove the car it felt like a ignition miss. The symptom is very easy to duplicate . I scope checked the cam and crank sensors all looked good. So I checke...
2000 Buick LeSabre Custom 3.8L no electric power VIN: 1G4HP54K0Y
HI Guys, We have a Buick with an intermitent no start after warm up. When this happens the car has no electrical power except for power seat, door chime, trunk light and horn. Thats it. We have no headlights, dashlights, dome lights,power windows not even door...
1990 Chevrolet R2500 Suburban Scottsdale 5.7L Oil Gauge VIN: 1GNGU26K9L
I have checked the wiring to gauge, when you unplug the sending unit the gauge goes to max pressure. I have installed one after market sender and two from the dealer. All three look different, all with same result, not wooking. It does appear that the gauge mo...
1994 Chevrolet K3500 6.5L MIL Lamp on VIN: 1GBJK34F0R
hi gm diesel tecs. this is hard worked truck that will turn on mil light, usually in morning. has started occationally doing it in after noon. clear code, start truck go approximately 1/2 mile, light pedal and mil light comes on. i've called standard tec line ... Trouble codes: 36 (long m/s injector pulse)
1994 Chevrolet Astro CL 4.3L Excessive Emissions, Poor Idle Quality VIN: 1GNEL19WXR
vehicle is loadeing up bad smells like gas almost wants to foul plugs at an idle
1994 Chevrolet S10 Blazer Tahoe 4.3L No Start VIN: 1GNDT13W4R
hi, i have 94 chevrolet blazer.got spark,fuel inj pluse, fuel pressure ok. new distributor, cap and rotor. new spark plugs. the problem of this car is sometime start and sometime crack but no start. please help me out. thanks.
2003 Chevrolet Impala LS 3.8L Wheel Bearing VIN: 2G1WH52KX3
This is my own car. Has a slight dragging or mildly scraping noise that appears to be comimg from left front wheel. Checked for brake problem, rotor interference etc. Brakes where low, so replaced pads and rotors. Could not find any sign of noise cause. Decide...
2002 GMC Sierra 2500 HD 6.0L Trailer Brakes VIN: 1GTCK29U32
This is a customer who is out of town and has called saying the 40 amp trailer fuse has blown and the trailer brakes are not working. A few days ago the trailer was overhauled with all new brake assem's, brgs, and drums. It is a large utility trailer that tows...
1999 Oldsmobile Silhouette Premiere 3.4L abs warning light VIN: 1GHDX03EXX
i have a 1999 olds silhouette with abs and traction control light coming on. my code is c1265 rear abs motor circuit short to ground. i have followed alldatas diag. tree which has lead me to replace the abs control unit. light came back on. then i replaced the...
1999 Pontiac Montana 3.4L ABS light VIN: 1GMDX03E3X
This pontiac montana has an ABS light that stays on with one or more of the following codes: C1225--LF excessive wheel speed variation C1226--RF excessive wheel speed variation C1232--LF wheel speed circuit open or short C1233--RF wheel speed circuit open ...
2004 Saturn Ion-1 2.2L compressor fuse VIN: 1G8AG52F44
this saturn has very high mileage due to fleet use, but runs and works well. the a/c compressor fuse blows intermittently and often. have checked compressor clutch, ohms, for shorts, wiggled, pressures...all is ok. yet to intermittent for us to catch it happen...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Park Avenue 3.8L Charging VIN: 1G4CW52KXV
Hi out there I am calling this one fixed it has been a week now and the custermer was pushing for his car so i did ended up puting new alt on this brougt my charging up to 14.3 volts I shuld have checked amps but I just did not have the time I did see on the s...
1988 Chevrolet Camaro 2.8L pre-ignition VIN: 1G1FP2154J
the customer refused to try a factory egr valve intead of the aftermarket one it had on it.They were out of money and time as is so often the case with older cars.the customer gets painted into a financial corner and if not handled tactfully will come out figh...
1995 Chevrolet Astro 4.3L fuel pump VIN: 1GNEL10W5S
Sorry I didn't reply earlier, but I just didn't fix this problem. I've had a few replies and I tried some, and some I had tried before. I even rewired the the wires from the relay to the fuel module, to the oil switch, and no success. I am still working on thi...
1996 Chevrolet C1500 Suburban 5.7L Electronic VIN: 1GNFK16R2T
I think this one is fixed, only time will tell for sure. Replies ranged from just replacing the solenoid as it is inexpensive and easy to change, wiring pinched by the trans. filter inside trans., a bulletin dealing with 96 PCM internal grounding problems, and...
1997 Chevrolet Cavalier 2.2L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: IGIJCI246V
A special thanks for all that took the time to reply. Suggestions from the EGR sticking, to the fuel press regulator, map sensor, O2 sensor, and injectors. All of those things were tried. The fix was the four new NAPA/Echlin injectors were flowing way too much... Trouble codes: P0300, P0172.
1999 Chevrolet S10 2.2L Stop Lights, Turn Signal Lamp VIN: 1GCCS1444W
I would like to thank all iATN techs who try their best to respond to my post. Special Thanks to Scott from Minnesota who had a tip to this problem, as he mentioned that truck has a short to power. It turns to be that the Dark Green/White wire (for Right Tur...
2002 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on, ABS and BRAKE lites VIN: 1GCHK23132
We had 'ground gremlins' everywhere - apparently after one of the the main ground cables caught fire and burned off, the ground system on this truck tried to find other paths to discharge the batteries. We found 3 burned off: G110 and G302 (on the frame behind... Trouble codes: U1000 (Class 2 Communication Error), P0571 (Brake cruise switch), P1631 (Theft system error).
2003 Chevrolet Suburban 1500 LT 5.3L Driveline VIN: 1GNFK16Z83
It appears that there is a GM bulletin that may apply to this problem with this vehicle. I've contacted the customer to reschedule but he has dropped off the face of the earth. Would have liked to pursue this one some and find a fix. Wish I could offer a bette...
2003 Chevrolet Impala 3.4L right front corner VIN: 2G1WF52E83
Customer has declined the repairs on this car, due to being traded off next month for a diferent vehical.
2004 Chevrolet Silverado 1500 LS 5.3L heated seats VIN: 2GCEK13T94
yes i have had the the computer reprogramed and that fixed the problem thank you All !
1994 Geo Tracker 1.6L raido VIN: 2CNBE18U3R
It turns out that I WAS doing it right all along. As I said, I pressed presets 2 and 3 and got sub code. hit tune up and Radio showed 0000. tune down was for last digit. tune up was for third digit. seek down was for second digit. seek up was for first digit. ...
1990 Oldsmobile Delta 88 Royale 3.8L Poor Idle Quality, Stall, Misfire VIN: 1G3HN54C5L
the fix was replacing the new crank senser I love bad new parts and a labscope that dont see anything maybe time for a new labscope. thank everyone.
2002 Pontiac Grand Am SE1 2.2L Won't run monitors VIN: 1G2NF52F32
Customer took vehicle to GM dealership and had reflash done under warranty per TSB. After driving vehicle for 3-4 days, all monitors had run and vehicle was taken in for emission test and passed. Thanks for all the help.
1996 Saturn SC2 1.9L Hesitation, Stall VIN: 1G8ZH1279T
Thanks for all the replies. We found the vehicle to be cross wired causing hesitation.I guess we just got stuck looking for a problem w/ the fuel system and wasn't looking @ the obvious. Thanks again...
2000 Saturn LS1 2.2L engine VIN: 1G8JU52F3Y
fuel filter was changed and we could not duplicate the problem. after about a week after my nephew took the car he called and said it was doing it again but not as bad. he never returned the car for us to recheck. it could have been bad gas because it happen a...
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