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Prev Professional Automotive Repair Technical Discussions for June 4, 2007
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Open Help Requests for GM
Help Request Answers
1995 Buick Riviera 3.8L No Start VIN: 1G4GD22145
scan data- tech 2 not running- rpm 20/ egr pintle 100% 5 volts- diconnecct 0 /tps coolant and iac sensors read o or -40 f at times- loose data at times- back probed ecm on tps haves normal readings- egr normal- iac normal-lab scoped fuel control signal normal ... Trouble codes: P0171 (fuel trim lean), P0325 (knock failure), P0401 (egr flow test failure)
1999 Buick LeSabre Custom 3.8L Cooling VIN: 1G4HP52K0X
Vehicle cools OK on short trips . Long trips will work good for about 1/2 hr or 45 min then freezes up or at least quits working . After turning off for a while will work OK again for a similar period . Drain holes for the water are open .This is not my area o...
2000 Buick LeSabre Custom 3.8L Air Bag VIN: 1G4HP54K3Y
I have a 2000 Buick Lasabre Custom that came in with an intermitten air bag light and security light on,also at times the radio cuts out.I test drove the vehicle and after 5 minutes the car chimed and the air bag light came on for about 5 seconds. then when th...
2002 Buick Rendezvous CX 3.4L Ignition VIN: 3G5DA03E22
I am replacing the ignition lock & cylinder, have the column apart and can't see a place to drill out the lock pin. The key won't turn to run at all so I have no alternative but to drill it out. I have done this on other GM vehicles before but I can't find an ...
1994 Cadillac DeVille 4.9L Stall, BLOWN FUEL PUMP FUSE VIN: 1G6KD52B5R
hello everybody, this car came to me last week. complaint is stall int. normaly started back up. never did duplicate concern. no codes at that time. fuel pressure always 42-45 psi. customer needed car and took. called back 2 days later, vehicle died and wouldn... Trouble codes: P0020, P0085
1960 Chevrolet impala 327CID reverse VIN: 01837J2591
are there any ways to step up servo pressure for reverse?
1989 Chevrolet R3500 Silverado 7.4L Poor Fuel Economy VIN: 1GCHR33NGK
Hi guys I have this 1ton that has been here for about a month now,the complaint is that shoots fuel out of fuel cap or the purge valve.I have personly not got it to do it.I think it does it on both tanks.any help would be great
1990 Chevrolet Lumina 3.1L Poor Idle Quality, Sounds retarded VIN: 2G1WL54T2L
Vehicle was towed in, no start,no codes stored fuel pressure and volume ok, found 2 open plug wires.Vehicle starts and runs after new plugs and wires but it sounds late or retarded. With atiming light on #1 wire timing is advanced at idle and corresponds with ...
1991 Chevrolet Lumina 3.1L No Start, Poor Idle Quality VIN: 2GIWL54T8M
hello and thanks in advanced i have this chevy lumina the car 3.1 and i wouldn't start so i checked fuel pressure and we have 40lbs and the 10 sec pulse .I checked for spark i have plenty next I pulled a spark plug to check for any problems i noticed the plug ...
1994 Chevrolet S10 Blazer Tahoe 4.3L No Start, Ignition key stuck VIN: 1GNDT13W2R
The key is stuck in the ignition, and the ignition is stuck in the run position. Crank no start. Fuel pressure is low, tried banging on the tank no start. Tried spraying starting fluid down the throttle body no start (though it seemed to try once). Am concerne...
1997 Chevrolet K2500 Cheyenne 7.4L Poor Idle Quality, Misfire VIN: 1GCGK29J6V
This truck came in for a rough idle and hesatation below 2000 rpm. Very noticable under load and under 2000 rpm. Isolated fuel leak to injectors and verified visually with plenum off. Have run into this problem before with a 454 vortec and new injectors solved...
1999 Chevrolet Lumina LTZ 3.8L Surge, Poor Fuel Economy, Low Power VIN: 2G1WN52K1X
This Lumina runs good when cold, until driven for 15-20 miles. It then has a surge and low power on acceleration, you don't feel it at steady speed. The fuel filter was completely plugged, but that didn't fix the problem. Fuel pressure stays within specs. cold...
2000 Chevrolet Corvette 5.7L starting VIN: 1G1YY22G9Y
This 2000 Corvette sits for the winter. The battery is usually dead after the winter. Most of the mileage was put on the first few years. This vehicle barely gets driven. The customer replaced the battery, but said it would be low after 4 days, and just click....
2001 Chevrolet Astro LS 4.3L differential VIN: 1GNEL19W21
We have an 01 Astro van AWD. Came in with rear tires locking up. Took differential cover off and side gears are totally gone, metal paste throughout the axle housing. Ring and pinion do not look bad at all. My first thought is to clean housing and replace gea...
2003 Chevrolet Express 3500 6.0L Security system VIN: 1GBJG31U73
Hello all!!! we have recently aquired this g3500 box van from a local construction site. Intermittenly this van will not start due to security system. It sets codes B2947 Security system sensor power circuit low, B2958 Security system sensor data circuit high....
1993 Pontiac Grand Prix LE 3.1L compressor VIN: 1G2WH54T2P
Hi everyone I have a fun one,I hope some one can help me. I have no compressor clutch ingagment I have tested power & grounds all good tested pressure switch a/c & p.s. all inputs to e.c.m. good. a/c is comanding on but no clutch. I can turn clutch on with sca...
1997 Pontiac Firebird Formula 5.7L destroys ignition VIN: 2G2FV32P6V
We originally replaced the cap and rotor do to exact same failure, we put about 15 miles on vehicle prior to customer picking up car (fun test drive), he drove it about another 20 miles before it died, vehicle was towed back to shop, we went through the tear d...
2003 Pontiac Aztek 3.4L Stall, Misfire, MIL Lamp on VIN: 3G7DB03EX3
Thanks to everyone for looking at this request. The wrecker brought this vehicle in with a dead battery. The battery was recharged and the vehicle started and seemed to run ok at idle. We check charging voltage and sometimes it would be at 13.5 volts and then ... Trouble codes: U1040 (Loss of class 2 communicationthis code was in the IPC), U1016 (Loss of class 2 communicationsthis code was in the BCM), U1016 (Loss of class 2 communicationsthis code was in the BCM)
2005 Pontiac Vibe 1.8L compressor VIN: 5Y2SL63845
Hello all, I have this Pontiac that came in with the A/C inopperative. I checked and found the compressor has internal damage. I replaced the compressor and accumulator which is serviced with the condenser. After replacing compressor and condenser I charged th...
1991 Saturn SC 1.9L bleeding VIN: 1G8ZH1478M
have a 1991 saturn coupe with abs, install a new mater cylinder because of external leaking at the back of the cylinder. now i can not get the air out of the system. no fluid out of the middle two brake lines on the abs system. i have a snap on solus but it do...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Cadillac Allante 4.1L ext. lites/output switch modules VIN: 1G6VR3175J
Wish i could close this as fixed, but no! Thanks to Robert [...] for their replies and to AC-Delco Techconnect Hotline for their help. With my 35+years with Cadillac service dept. [I was there when first and last Allantes were built] and my ...
1997 Cadillac DeVille 4.6L a/c compressor VIN: 1G6KD54Y6V
thanks for the great responce to my reqeast, 9 replies the fix was the evaporator inlet temp sensor reading [...] on of calibration thanks tim
1998 Cadillac Seville SLS 4.6L hvac control and blend door VIN: 1G6KS54Y1W
We finally removed the mode door actuator and worked the doors by hand, with the desired results. The new actuator does not come preset from Cadillac. Even though it is hard to get at, changing this actuator is easier with the dash installed because you need t...
1994 Chevrolet S10 4.3L abs VIN: 1GCCS14ZXR
Thanks for all the replys and sorry for the delay I just got the truck back today but anyway the left front speed sensor fix all problems thanks again.
1999 Chevrolet K1500 Suburban 5.7L Misfire, MIL Lamp on, P0300 VIN: 3GNFK16R2X
Unbelievable! Thanks to all who replied, especially Bruce [...]. who recommended looping a vacuum gauge into the PCV system and watching for the gauge to act like a burnt valve when this problem occured...and BINGO there it was. That monday I pulled the heads and ... Trouble codes: P0300 (random misfire).
2001 Chevrolet Blazer LS 4.3L No Start VIN: 1GNDT13W71
First off, Thank you to all that responded to this dilema. It's good to know that there are still top notch technicians out there. After further diag. I found out I could make the car run by Disconnecting the pcm for about 15 minutes resetting the KAM. It woul... Trouble codes: P0101 (Mass air flow sensor performance).
1993 Pontiac Bonneville SE 3.8L Excessive Emissions, Poor Idle Quality, Surge, Poor Fuel Economy VIN: 1G2HX53LXP
This time the vehicle is repaired. The problem was indeed a bad ground at the connection under the ignition module. the connection was tight but the wires and the nut was corroded. I disconnected all grounds and checked them and found the corrosion. Thanks to ...
1996 Pontiac Trans Sport 3.4L MIL Lamp on VIN: 1GMDU06E7T
Customer had his old service records and i found a dealer had 'repaired a short in the fuel pump cicuit' turns out they used a different [...] up the fuel pump relay and the puller fan,just leaving the data link conn. and an intermintent short ... Trouble codes: P0441 (evap system purge no flow), P1655.
1997 Pontiac Sunfire SE 2.2L Misfire VIN: 1G2JB524XV
Thanks for all the replies after market injector from standard was causing the problem fuel trim at -27 installing an a\c delco injector the misfire was gone. you might want to stay from their injectors as we had one fail on a 3400 in a pontiac montana it stuc...
1997 Pontiac Trans Sport 3.4L 1st Gear VIN: 1GMDX03E6V
Thanks to all that replied. All the responses made sense, but the problem was a check ball that ended up in the wrong spot upon assembly. Amazing how much hair loss one of those tiny little things can cause.I found it when I was rechecking the pistons in the i...
1999 Pontiac Bonneville SSE 3.8L MIL Lamp on VIN: 1G2HZ52K9X
I think I have fixed this one,I ended up retesting system,found that the evap canister was not flowing like it should.Installed new canister and have not seen it for a week now. Trouble codes: P0446 (Evap Vent Performance).
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