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Prev Professional Automotive Repair Technical Discussions for January 4, 2007
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Open Help Requests for GM
Help Request Answers
1993 Buick Skylark Custom 3.3L No Start VIN: 1G4NV54N8P
Has good fuel pressure and volume. No injector pulse, No spark. No spark from any coil. Has erratic injector pulse- sometimes light is very bright them dim. Does not blink on and off in synch like normal operation. Have tried new crank sensor and ignition cont... Trouble codes: 44 (lean exhaust), 42 (est circuit open or grounded), 13 (O2 ckt open or short or bad)
1993 Cadillac DeVille 4.9L electronic climate control VIN: 1G6CD53B9P
vehicle came in with climate control and fuel data reading with the letter c displayed on each unit. from what I read there is a conflict or no comm between ecc and bcm. thanks in advance for any and all replies to help solve this condition. mario
1999 Cadillac Catera 3.0L codes VIN: W06VR52R7X
vehicle came in with abs light, traction control light, & mil all on. had codes u2108, p1700(trans), & vss code. all-data flow chart said test circuits xr888 & xy888 for open or ground & if ok replace tcm. circuits checked ok replaced tcm & reprogramed(@ deale... Trouble codes: U2108 (can bus error abs)
1995 Chevrolet Blazer 4.3L No Start VIN: 1GNCT18W6S
We got this blazer from another shop that will not start when temp is below 35 degrees. The other shop replaced the fuel pump, tune up parts and o2 sensor with delco parts. Fuel pressure is 62 psi koeo, 58 psi koer and pressure holds koeo. Adding fuel does not...
1995 Chevrolet Caprice Classic 5.7L No Start VIN: 1G1BL52P6S
Greetings fellow techs, Got a strange one in today. Complaint at first was hard start cold. When the car was finally brought it was a no start condition. Customer has replaced the following items-coil, cap, rotor and plug wires. We checked spark and have stron...
1997 Chevrolet Lumina 3.1L vats VIN: 1G1WL52MXV
Engine would not start from key but would crank start stall if starter solenoid was jumped. Customer suspected the ignition key was bad (he was right, resistor pellet was open) so he had the GM dealer make him a new key from VIN info. Now the engine will s...
1997 Chevrolet Cavalier 2.2L Cooling Systems VIN: 1G1JC1244V
Hello everyone, I'm having trouble with a Cavalier that is running hot. It came in with the complaint of the temp was almost in the red. I installed a new thermostat and that did not help the problem. I got a second thermostat because I thought the first one w...
2001 Chevrolet Monte Carlo LS 3.4L Radio, headlight VIN: 2G1WW12EX1
This is a co-workers car and the problem is the radio will lock at times and when it locks the headlights will blink really fast and there is a rapid clicking noise coming from underneath the dashboard. This has happened about 3 times in one month and the secu...
2002 Chevrolet Venture LS 3.4L reverse VIN: 1GNDX13E92
slow going into reverse-hard 2-3 shift-creeps forward in neutral. You can turn the vehicle off and restart it and it will go into reverse fine until you go to drive and when you come back to reverse again slow engauging. The same is true for neutral. It will c...
2003 Chevrolet Express 1500 4.3L No Start, Cuts out, HARD START VIN: 1GCFG15X43
Customer said originally car died while going down the road & would restart hard but would not stay running very long. Vehicle came in no start/cranks .At times during cranking the engine sounds like It is hydralic locking or has excessive starter draw .Car w... Trouble codes: P1626
2001 GMC Yukon Denali 6.0L Compressor VIN: 1GKEK63U21
Hey all, I have a 2001 GMC Denali here with the rattling of the A/C compressor drive belt tensioner on acceleration problem. I have a copy of the GM tsb, and I thought there was a new design compressor that replaced the old one, but my local GM dealer tells me...
2001 GMC Sierra 1500 SL 4.8L Poor Idle Quality, Misfire VIN: 2GTEC19V51
This one came in with a rough unstable idle complaint... I checked it when it came in and had a P0171 and P0174 lean codes... sprayed carb cleaner around looking for a vacum leak and noticed my long term seemed to change when I soaked the intake runner so I tr... Trouble codes: P0171 (Lean Bank 1), P0174 (Lean Bank 2), P0300 (random misfire)
1997 Oldsmobile Aurora 4.0L Misfire, MIL Lamp on VIN: 1G3GR62C5V
help gm, cadillac, olds gurus)))!!! this aurora is killing me. customer brought car in running very poorly with check engine light on, testing revealed vacuum leaks at throttle body base, and bad mass air flow sensor. also had ignition misfire on cyls 2,8. (wi... Trouble codes: P0300 (multiple cylinder misfire)
2002 Oldsmobile Aurora 4.0L inop VIN: 1G3GS64C12
Vehicle came in with speedo not working, no codes. Followed flow chart in Alldata lead me to bad instrument cluster. Replaced cluster still no speedo. Retested still came up with bad cluster. Called company that repaired/ exchanged it they said it was check an...
1997 Pontiac Bonneville SE 3.8L level ride VIN: IG2HZ5210V
please help thank you!
1998 Saturn SL1 1.9L MIL Lamp on VIN: 1GBZH5281W
helo friends, have a code that resets. i checked the vent solenoid, manually can operate valve and does open and close. has volatge at solenoid. unable to see any kinked hose from tank to solenoid. is there any common faults with this system for this code. any... Trouble codes: 90446 (vent solenoid fault)

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Regal 3.1L Stall, Misfire VIN: 2G4WB54T5M
Thank you all for your help. We still don't have a cure for this vehicle. Since last update, drained gas tank, refilled with fresh gas, changed the ecm prom. At this point we have disembled engine down to intake gaskets, so basically were starting over. engine...
1994 Chevrolet Astro 4.3L No Start, hard start
Well, the vehicle is supposed to leave tomorrow to be traded in. This morning, we were playing with it to check out the coolant temp sensor and ignition module. We unplugged the injector and cleaned the rearmost plugs. We figured that if they were wet again wi...
1996 Chevrolet Caprice Classic 5.7L MIL Lamp on VIN: 1G1BL52P7T
Thanks to all that sent help. We went and tested the system as though the TSB had NOT been performed, We found that the PCM was comading the relay to turn the pump on, this lead me to thinking the pcm had Not been recalibrated. I took the PCM to a vender that ...
1998 Chevrolet C6500 7.2L No Start VIN: 1GBJH1C1WJ
thanks to RD [...] for thier input. It appears i just got an odd ball problem. the key was #5 inj. dumping oil out the return when none of the others were. replaced it and it fired right up and runs great and sounds better than it has in awhi...
2000 Chevrolet Express 3500 5.7L starter VIN: 1GCHG35R6Y
Another starter was fitted, this time a 'new generation' brand reman unit from WorldPac. We also replaced the crank position sensor as many responses mentioned a problem with the timing getting too advanced on starting. The part wasn't too expensive either. We...
2000 GMC Yukon Denali 5.7L spongy/soft brake pedel VIN: 1GKEK63RXY
Thanks to everyone that responded with suggestion. The replies were very well written and interesting. It seems the problems that seem to be very difficult are easy fixes. I ended going back over the entire brake system and measured and inspected all brake com...
2000 GMC Sierra 1500 SL 5.3L No Start VIN: 1GTEK19T5X
Vehicle had aftermarket remote start system, once it was totally removed fixed it. Trouble codes: B2960 (Passlock sensor data incorrect), P1631 (Theft Deterant enable switch not correct).
1993 Pontiac Grand Am SE 2.3L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 1G2NE1430P
Thank you to everyone who replied, As per many suggestions I replaced both coils, coil housing, coil boots, new plugs already installed (ignition module tested OK). Running on all cylinders now with no hesitation. Cleared CEL, and has not come back on. Thanks ... Trouble codes: 23 (iat circuit low), 34 (map circuit low).
1993 Pontiac Grand Am SE 2.3L ignition VIN: 1G2NE5431P
had to take pan off and knock it back up out of the hole. thanks for all the replies. i had tried the self tapping screw trick and no luck. just hoping some one knew a majic trick. this is abad way to start the new year.
1999 Pontiac Grand Am SE 2.4L Anti-Theft VIN: 1G2NE52T4X
Thanx to all that replied on this post We verified all powers and grounds to this system, cleaned all grounds to be on the safe side. Removed tumbler and cleaned all grease from tumblers and reinstalled - could not get unit to fail in shop or 2 days we had her...
1999 Pontiac Grand Am GT 3.4L MIL Lamp on VIN: 1G2NW52E2X
well thanks to all the replies, i went ahead and replaced the cam sensor. i now have a signal on data stream all the time. no codes are setting. what threw me off on the test is that i kept having a cam signal on data stream even with key on engine off and wit... Trouble codes: P0341.
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