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Prev Professional Automotive Repair Technical Discussions for October 13, 2008
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Open Help Requests for GM
Help Request Answers
1996 Chevrolet Blazer 4.3L No Start VIN: 1GNCS13W2T
truck came in no start.plugs fuel fouled. checked fuel pressure it was steady. replaced plugs cap and rotor. started up. next day would not start.plugs fouled again. spark was weak, had used coil and module put on and spark was strong. still no start.pulled up...
2002 Chevrolet Malibu 3.1L Hesitation, Surge, Misfire VIN: 1G1ND52J12
This car runs ok at idle. On the road under light accel it runs ok, On hard accel it is very slow in taking off. it will go up to 3500 rpm's with wide open throttle. will not rev any higher. will shift gears if you back off the throttle. No codes show on my sc...
2005 Chevrolet Silverado 1500 SS 6.0L MIL Lamp on VIN: 1GBHC24U15
hey guys i am having a bit of trouble on this truck. vehicle came in with a reduced engine power code. checked all data for info and found the was a problem with this vehicle. computer was telling us to replace a couple components which sounded like they would...
2005 Chevrolet Silverado 1500 5.3L oil pressure guage VIN: 1GCEC14T45
The customer said that sometimes the oil pressure indication is very low, but there is never any engine tapping or knocking. He asked us to replace the sending unit, which we did and it seemed OK. After the weekend, the pressure is low sometimes, and even appe...
1998 Oldsmobile Intrigue 3.8L shifter VIN: K8WF313478
Shifter is very difficult to move out of PARK. Even with both hands crushing the release button it will reluctantly unlock. Solenoid removed to eliminate that. Seems the plastic rod that is pushed down by the button in the handle does not travel far enough to ...
1996 Pontiac Firebird 3.8L Poor Idle Quality VIN: 2G2FS22K6T
Thanks in advance for taking the time to read this. This firebird has a miss only at idle on cylinders 1 & 3. Compression test results #1 150psi,#3 130psi,#5 180 psi,#2 170 psi, #4 180 psi, #6 170psi. Although 1 & 3 are lower, it shouldn't be low enough to cau...
2000 Pontiac montana 3.4L Misfire VIN: 2MECM75W5W
vehicle came in with engine light on dash & bad misfire on idle only of cyl # 6. we smoked engine & found leak from lower intake manifold gasket. we replaced with new gasket kit & replaced cyl # 6 injector. same problem. please help Trouble codes: P0306
1999 Saturn SC1 1.9L Excessive Emissions, Poor Fuel Economy VIN: 1G8ZF1284X
car came in ses light on po172/po304 misfire is not all the time stft was around 116 ltft 108 wont change.plugs are black with running rich. checked coolant temp with raytec is within 3 deg of temp.cleaned throttle plate and reset system(batt disconnec... Trouble codes: P0172, P0304
2000 Saturn LS2 3.0L Surge, MIL Lamp on VIN: 1G8JW52R4Y
Customer complaint was CEL and car stalls when hot, will not restart until cooled down. Pulled codes P0727, 1780, and 0102. I replaced the crankshaft postion sensor and reset the computer and road tested. The Po727 and 1780 codes did not come back and stalling... Trouble codes: P0102 (Mass air flow low), P0727 (No RPM signal to TCM), P1780 (Transmission code - goes back to P0727)

Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac Catera 3.0L Mechanical VIN: W06VR52R44
Thanks to all for your vac hose info! Although most of the diag.were like the ones I had. [inconclusive] Scott came across with some actual photos. Wow What and amazing group! Thanks again IATN. Larry
1971 Chevrolet Chevelle 502CID Pinging VIN: 1D37H2B587
First thanks to all who replied, Im finally back to work and the fix on the Chevelle was a new cam from GM. Im sorry that I cant tell you all what was wrong but I ended up bad sick and out of work for a week. The guys I work with installed a new cam per owner ...
2002 Chevrolet Impala 3.4L lights VIN: 2G1WF55E12
thanks to all that left helpfull advice I took the word of a few of you and had another shop replace the BCM and program it along with the headlamp wire harness all is good.I'm old school and donot have the equipment to do the programing myself so I feel like ...
2003 Chevrolet Astro 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNDM19X03
Having my suspicions on the PCM, I decided to monitor the voltage coming from the battery and ignition switch as well as the (12v) voltage going to the crank sensor. With 3 DVOMs hooked up, on the gazillionth attempt the van would not start. I checked input vo... Trouble codes: P0355, P0341, P0608, P1626, U1064, U1301.
2002 GMC Savana 1500 5.7L daytime running lamps, fuel relay, starter relay VIN: 1GDFG15R12
1995 Oldsmobile Aurora 4.0L 80 Idle relearn VIN: 1G3GR62C3S
Had one good reply on the info I was wanting, but he never sent me the attatchment! So I set the car so it would run at about 600 rpm idle with the idle motor retracted,relearned it again and shipped it. No thanks to Mitchell and all its wrong info!!! Trouble codes: 80.
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