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Prev Professional Automotive Repair Technical Discussions for March 8, 2007
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Open Help Requests for GM
Help Request Answers
1995 Buick Park Avenue Ultra 3.8L Lots of codes VIN: 1G4CU5219S
Greetings GM techs...This 95 ultra has the OBD II connector and does give the 4 digit OBD II service codes. Two years ago it was in for MIL light on, mulitple current and history codes. At that time we checked and cleaned every ground, looked and tested everyt...
1996 Cadillac Fleetwood 5.7L Long Crank Time VIN: 1G6DW52P8T
This vehicle came in with a hard start / long crank time overnight only problem. I put a fuel gauge on cold & got only 20 psi with key on only initially. It would eventually start when the pressure built up to about 31 psi 10-15 seconds later. Normal spec is 4...
1999 Cadillac Catera 3.0L Misfire VIN: W06VR52RSX
Single cylinder misfire (#3) under light to moderate load . just as the approach to a hill is encountered. This feels just like a spark exiting the boot and not firing in the combustion chamber. It can be seen in misfire datastream . Can not duplicate in the s... Trouble codes: P0303 (only set the code once misfire cylinder 3)
1999 Cadillac DeVille 4.6L Unknown VIN: 1G6KD54Y3X
We just put a new engine with no problems started car and got code p1810 tfp valve position switch circuit 3 ... the car does not have reverse neutral it goes forwards in all gears.. never ran into this before any suggestions? I did check fluid levels and con...
2002 Cadillac Seville SLS 4.6L electrical VIN: 1G6KS54Y22
Not a Cadillac man, does anyone know what "service electrical system" means when shown on the instrument panel? Any help greatly appreciated. Thanks
1995 Chevrolet K2500 Cheyenne 6.5L high idle VIN: 2GCFK29S1S
Complaint of high idle since engine compartment was pressure washed. Used car lot vehicle. Tech 2 shows fuel rate at 10 to 12 ms and desired idle speed at 1086 RPM. Idle speed matches that. Slight rough run and excess smoke. Worse when revving out of gear. At ...
1998 Chevrolet Blazer 4.3L air distribution VIN: 1GNDT13W4W
hello,i am surprized i have not seen this problem before,i was gm master tech. for 15yr.Any way, everything is operating as designed, only no air at floor in floor mode.Inspected floor mode actuator to find it working(in+out)but the stub,or door that the actua...
1999 Chevrolet Cavalier 2.2L long cranking times VIN: 1G1JC1243X
this a friends car, after head gasket repair at another shop a while back. it cranks a long time before starting. it almost acts like timing is retarted. the switch has to be held until the engine finally hits enough to override starter. if the key is released...
1999 Chevrolet Blazer 4.3L Can't remove VIN: 1GNDT13WXX
Sorry gang . Stupid attack here . I need to remove the upper plenum on this 4.3L , and I can't get the injector assy (spider) to seperate from the plastic plenum . I can't remember doing this before . Do I need special tools or is there some kind of latch that...
1998 GMC K2500 Sierra SL 5.7L No Start VIN: 1GTGK29R2W
truck cranks no start cold, has spark at the sparkplugs. fuel pressure is 50 psi. fuel quality looks good. once the is pushed in @ warms up a bit it starts @ runs fine. then fuel pressure is 52 psi.
2000 GMC Jimmy Diamond Edition 4.3L Stall VIN: 1GKDT13W3Y
All Systems & Gauges Ect Read And Act Normal - Engine Shuts Off At Will - Restarts Fine
1996 Pontiac Grand Am GT 3.1L No Start, Stall VIN: 1G2NW12M8T
Car was towed to the shop with a no start condition. We found the car would start and then shut down immediately. It acts as if the security system is shutting car down, however the theft light is not blinking. We checked for codes and only found code 1573. ... Trouble codes: 1573 (no communication between ebtcm/pcm)
1999 Pontiac Grand Prix GT 3.8L MIL Lamp on VIN: 1G2WP52K8X
good afternoon to everyone. i have this pontiac that keeps turning on the mil light for # 2 knock sensor problem . i have allready replaced the sensor with no luck. mittchel says that the pcm supplies 5 volts to sensor but i have checked voltage at pcm and the... Trouble codes: P0332
2001 Pontiac Bonneville SE 3.8L Valve train VIN: 1G2HX54K81
Car came in with complaint of check eng. light & bad ticking noise. We found multiple misfires on #2 cylinder(code po302)& noise came from that cylinder(sounded like a very loud lifter/valve train noise) - Ran in bay for 10 minutes & noise just quit. Checked 3...
2004 Pontiac Grand Prix GT2 3.8L Cruise Stops Working VIN: 2G2WS52294
Vehicle comes into local shop with cruise control that stops working. I assist the owner with the diagnostics. Using eSI & alldata, go through trouble trees and perform testing. Using the BDM, AutoEnginuity & Snap-On MT2500 the only cruise PIDS available on SO...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac Catera 3.0L abs VIN: W06VR52R3V
Well thanks to everyone who replied. as suspected it was the EBTCM, we removed it from the pump, drilled out the rivets where the screws go thru, removed the solder from the six contacts and pulled the assembly apart. Found the metal pathway from b+ to the fir...
2000 Cadillac Seville SLS 4.6L MIL Lamp on VIN: 1G6KS54Y4Y
As suggested, I replaced bank 1 O2 with OEM. It still has bosch O2 for bank 2 and after cat sensors with no problems. Customer returned today, has driven over 300 miles with no problems and fuel mileage is better than before. thanks again for the help. Trouble codes: P1134.
1993 Chevrolet C1500 Cheyenne 4.3L running lights VIN: 1GCEC14Z6P
Thank you to all that replied. I found a short in the wiring harness that runs along the bottom of the core support. it was between the right front marker light and the horn, the ground was fried from the horn connector all the way back to a ground junction un...
1995 Chevrolet Blazer 4.3L transfer case VIN: 1GNDT13W9S
The fix was to replace the transfer case. The snap ring in the tail housing was just fine, the motor that drives it from 2wd to 4wd was not sticking. I had actually removed the front diff, found no problems inside it. There was metal shavings on the oil pump s...
2001 Chevrolet Monte Carlo LS 3.4L high idle VIN: 2G1WW12E61
well chris from wisconsin was dead on the tps scoped good but when i replaced it the car idled perfect and customer is very happy.. thanks guys... ron
2004 Chevrolet Impala 3.8L temp gauge VIN: 2G1WF55K04
Thank you all so much. Turned out to be a bad instrument cluster. I performed a gauge sweep, and the temp gauge would go up, but never return fully. For anyone else reading this, the new cluster must be programmed. There was some discussion as to whether this ...
2004 Chevrolet Trailblazer LS 4.2L speedometer VIN: 1GNDT13S04
Hello All, Sorry for the late post, the customer kept cancelling appointment. Although I thought it was instrument cluster it was nice, real nice to have this resource to confirm it with you all. This customer elected to go to dealer and the new cluster fixed ...
2000 GMC Jimmy SLE 4.3L Fuel Gauge VIN: 1GKDT13WOY
I tried everything to resolve this one with no luck, the fuel gauge runs off class 2 serial data and we never found the problem. Customer didnt want to spend any more money or time on it . Thanks for all those who replied hopefully no one else runs into this o...
1999 Oldsmobile Alero GL 2.4L Electronic VIN: 1G3NL52T9X
2 of the replies said it should still have rear hydraulic pressure & one said the valve in the ABS unit was stuck in the hold or bleed off position. Unfortunatly I will never know the fix because cust didn't want to spend the money because of other concerns on...
1991 Pontiac Grand Prix LE 3.1L Surge VIN: 1G2WH54T9M
4 out of 6 injectors tested under 9 ohms... replaced all 6 of 'em & it runs good!!! Thanks to all!!
2002 Saturn Vue 3.0L cooling fan VIN: 5GZCZ63B02
I want to thank everyone who replied. This vehicle originally came in with the SES light on and Code P0128. It was during my testing in the shop that we noticed the cooling fan was not turning off, even when coolant temp was low 75c. So as per the TSB for code...
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