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Prev Professional Automotive Repair Technical Discussions for December 7, 2009
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Open Help Requests for GM
Help Request Answers
1978 Cadillac Seville 5.7L vents VIN: 6S69B80468
I need some help. I put a new heater car in this old girl, and now I am getting no air out of the vents. I have defrost, and floor, and even a little air out of the vents on bi-level, but nothing on high. I smoke checked all the vac lines and found no leak...
2001 Cadillac Seville STS 4.6L Cluster VIN: 1G6KY54951
This is a car we sold, I have been chasing my tail. When the car is exposed to cool to cold weather the cluster will act erratic. Sometimes it wont light the backlighting, but the indicators will light. The fuel gauge will read empty or something different eve...
1990 Chevrolet Lumina APV 3.1L rear drum brakes VIN: 1GLBU05D8L
customer complaint of rear brakes locking under normal pedal pressure.test drove and confirmed.he says they were locking before recent brake job,no change afterwards.so i pulled the wheels,found new friction allaround,rotors and drums well within specs(this wa...
1991 Chevrolet K1500 Sport 5.7L MIL Lamp on VIN: 1GCDK14K2M
greetings, here's a good story. truck came in for a code 32 setting on highway cruise. my tech repaired the inoperative egr valve, replaced the o2 sensor, and replaced spark plugs.the engine, by the way, has a modified bottom end, cam, port fuel edebrock conve... Trouble codes: 43 (est/circuit sensor)
1993 Chevrolet S10 Blazer 4.3L Excessive Emissions, Poor Idle Quality, Cuts out, Misfire VIN: 1GNDT13W7P
Hey calling all car gods!! This blazer is being a pain. The truck has got almost a misfire at idle, but i cant seem to pinpoint what cylinder it is, and also after you drive it when it gets hot the truck seems like it has no power... Almost like the exhaust is...
1994 Chevrolet G20 Chevy Van 5.7L Stall VIN: 1GCEG25K1R
Engine stalls with rapid application of throttle in neutral or with any throttle application with vehicle in gear. All ignition has been replaced including 2 new distributors. Fuel pump is new with 14 psi that remains constant when engine stalls. Vacuum is 18 ...
2003 Chevrolet Cavalier 2.2L Cooling Systems VIN: 1G1JC52F73
I have a 2003 Cavalier here that we installed a thermostat and waterpump in. We have tried to bleed the cooling system of air to no avail. We tried our coolant flush machine, tried pouring coolant in highest point ect. Any help would be great. Is there a speci...
2003 Chevrolet Tahoe LT 5.3L TFT and TCC VIN: 1GNEK13T83
hi guys, just need to know from were can i order the terminal test kit (j44152 and j35616-b) for gm. i call the dealer, snapon, mac,local parts store and transmissions part stores with no luck. thanks. jose
2003 Chevrolet Venture LS 3.4L umder front floor mat VIN: 1GNDX03E53
Please Help ! floor gets very wet, water only, no coolant, cannot find source of leak, any ideas ? Thank You.
1999 GMC Jimmy SL 4.3L transfer case VIN: 1GKDT13W7X
Hi there all. Gm guys, have this jimmy, with transfer case code B2725 active TC mode swt MALfunction. No other codes found. 2wd indicator is on, and stays on, does not flash, or act funny, and truck is in 2wd. I have pulled module,found small corrosion, cleane...
2003 Hummer H2 6.0L communication VIN: 5GRGN23U53
This vehicle has no communication between my scanner and OBD2 conn. It has an ABS and Traction control light on the dash illuminated. has anyone encountered this problem. Thank, you
1990 Oldsmobile Custom Cruiser 5.0L Poor Fuel Economy, MIL Lamp on VIN: 1G3BP84Y6L
Customer complaint is poor mileage. I have no comuniction and the chedk engine light is on all the time.Code 12 will not flash with A& B jumped. I have 12 Volts at the mixture control solenoid but no computer control. I pulled the prom it and won't flash code ...
1997 Oldsmobile Silhouette 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GHPU06EV5
car came in for rough running all speeds. engine will run for 2 seconds smooth when first started & then misfire. cleaned injectors with gm injector cleaner, vacuum readings normal. spark plugs are correct, firing order is correct checked coils for arcing subs... Trouble codes: P0300, P0304
2001 Oldsmobile Silhouette GL 3.4L Hesitation, Misfire VIN: 1GHDX23E51
car came in with running bad at cold.after 3 miles runs ok.first time came in could not duplicata complaint,no codes.she indicated she leaves house fine and about 3 miles starts to misfire,backfire.we checked plugs,were orginal,coil on 3 cylinder rusted out.re...
2003 Other GM h2 6.0L no communication VIN: 5GRGN23U53
vehicle cme in with a shift complaint,that it stays in first gear until accelerator is let up and then it will shift into 2nd gear and won't shift out of 2nd gear. Also had a complaint that ignition key won't turn back far enough to be taken out of ignition cy...
1994 Pontiac Grand Prix SE 3.1L starter/ flywheel VIN: 1G2WJ52M8R
I put a new starter on this vehicle about 2 weeks ago for a no start condition. Brings back for flywheel starter noise like it is no properly shimmed. I tried many shims and half shims no luck. I wired up a remote button and no longer have noise problems. I te...
2003 Pontiac Grand Am GT 3.4L No Start, VIN: 1G2NW52EX3
Ok, Were really having a problem with this one, Car came in for a jasper Replacement 3.4 due to rod knock. We drove the car into the shop, Replaced the engine, and we cannot get it to start, We cannot get any spark. We have fuel pressure, Injector pulse, Seein...
2000 Saturn SL 1.9L Poor Fuel Economy, MIL Lamp on VIN: 1G8ZH5287Y
tried "everything" plugs don't reflect rich condition forced lean by removing pcv -- engine revs to 1500 rpm's & b1s1 dips a little to .600 vdc & climbs back up short term trim is at -50 at idle with vacuum leak induced, short term trim only goes to -45. ch... Trouble codes: P0172, P0410 (secondary air sys flt), P0303 (misfire cyl 3)

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Park Avenue Ultra 3.8L Electronic VIN: 1G4CU5214X
Thank you for all your help. It was the control head or programmer. Installed a new unit and the hvac system performs normally.
1988 Cadillac Seville 4.5L Master Cyl VIN: 1G6KS5156J
This one was a little strange, but after the 3rd master...its finally gone. I let it gravity bleed on the bench for about 5 hours. Put it on the car and bled the lines at the master and ended up with the same issue as before. I took the upper line off of the ...
1999 Chevrolet Blazer LS 4.3L tcc module VIN: 1GNDT13WXX
We fixed it finally!!! What we did was to connect a dual trace scope on both of the prop shaft speed sensors at the module to compare waveforms from the 2 sensors. What was happening was the rear prop shaft sensor would drop off from approx 5.2 volts at 15 mph...
2001 Chevrolet Silverado 3500 LS 8.1L alternator/battery VIN: 1GCJK39G91
vehicle has been working properly since 2nd alternator was installed. battery also replaced. thanks to all who responded and offered advise.
2002 Chevrolet Suburban 2500 LT 6.0L Stall VIN: 3GNGK26U62
Sent vehicle to dealer. Problem was fuel delivery. Great customer, but a problem child car. We had previously replaced the fuel pump multiple times for different concerns. Usually was due to sending units sticking. So,I'm going to let someone else deal with th...
2002 Chevrolet Silverado 2500 HD 6.0L driveline
Thanks for all the help on this vehicle. Dennis was right about the friction modifier. I changed the fluid and noted it was really clean. I put new fluid in and a posi additive. I drove it to an open parking lot and did some figure eights and the noise wen...
2003 Chevrolet Impala 3.8L no heat VIN: 2G1WH52K13
Sorry Guy's I forgot about this request i have been very busy.System had air in system and wasn't filling from coolant tank, i found radiator cap wasn't working properly.replaced cap filled system and shipped customer,have seen again for different complaint an...
2004 Chevrolet SSR 5.3L MIL Lamp on VIN: 1GC3S14P94
The fix on this one was a OE weak battery. Did not notice it on start up but it failed all tests, replaced it and the crank vari learned the first time. Trouble codes: P0315.
2004 Chevrolet Suburban 1500 Z71 5.3L Reduced Power VIN: 3GNKF16Z44
We can call this one fixed. As Roger from Alberta, and Mark from Tennessee suggested the ground to the frame was bad. I had gone to each of the grounds and tightened them, but I had not taken them completely loose and cleaned. I finally just ran another ground...
2001 Oldsmobile Intrigue GLS 3.5L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on, no start VIN: 1G3WX52H41
found car hadf some contaminated fuel drained and refiulled with new filter also replaced plugs flooded has not returned since repair Trouble codes: P0300.
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