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Prev Professional Automotive Repair Technical Discussions for April 24, 2007
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Open Help Requests for GM
Help Request Answers
1975 Cadillac Eldorado 8.2L compressor VIN: 6L67S50413
Trying to help a guy restoring an eldorado convertable. Converted to 134A refrigant. Compressor is reman unit, and works great if you jumper coil. Compressor will not engage from the control head. Car has automatic temperature control, and we do not have any s...
1998 Cadillac DeVille 4.6L Electronic VIN: 1G6KD54Y8W
hi guys. i need some help from cadillac techs. the ac compressor will not engauge. the system is full(just recharged today). i checked the car for codes, no codes. checked compressor relay-ok. i can engauge clutch with my scanner but when i turn the air on i g...
1993 Chevrolet Corvette 5.7L starter VIN: 1G1YY33P9P
Hi all, This one is a stumper. Customer drove vehicle previously. No problems. Came back to vehicle later and would not crank. All dash lights light up. Security light is on while turning key. I have power at the starter enable relay small yellow wire and bla...
1996 Chevrolet K1500 Cheyenne 5.0L MIL Lamp on VIN: 2GCEK19M6T
This truck has been around from shop to shop, with no problem found. MIL is on, but no codes and will not clear with scan tool or discnnecting battery. We install new ecm, but same thing. Removed dash unit to test wiring, found brown with white wire from ecm g...
1999 Chevrolet C3500 5.7L Brakes VIN: 1GBJC34R8X
This truck has a very hard brake pull to the right, while driving forward and to the left while driving in reverse. The vehicle will exhibit this pull even while coasting in the parking lot at very low speed. Brake wear front and rear, left to right has always...
1999 Chevrolet Camaro 3.8L Misfire, MIL Lamp on VIN: 2G1FP22K7X
THIS FOR A CO-WORKER,.. original complaint was no heat,..intake gasket was leaking,.NO driveability problems at that time. Replaced gaskets,..delivered car 3 days later check engine light on,..idles good when cold,..as engine warms up noticeable "shake" and in... Trouble codes: P0171 (fuel trim system lean bank 1), P0174 (fuel trim system lean bank 2), P0305 (cly 5 misfire)
2000 Chevrolet Silverado 1500 4.3L No Start VIN: 1GTEC14WXV
This truck died going down the road now it will not restart. Has good spark and fuel pressure. The injectors are not getting ground to all of them. Have replaced the ECM and checked all the sensors. Has anybody ran into to this before.
2003 Chevrolet Silverado 2500 HD 6.6L reverse VIN: 1GCHK29143
well maintained(serviced) allison trans just started acting up during last snow storm . ie no reverse and range shift inhibited message on display. shut off truck,restarted prob disappeared and hadnt reoccured till yesterday found code p0743. clear code and it...
1993 GMC Sonoma SLE 2.5L MIL Lamp on VIN: 1GTCS14A4P
This truck start's and run's well but check engine light comes on with o2 sensor rich code and then goes out when accelerating. Will come back on after sitting in traffic at idle and then goes out when accelerating.Also there's no cross count's recorded or see... Trouble codes: 02, SENS0, R1CH
2004 GMC Envoy XUV SLT 4.2L endgate VIN: 1GKET12SX4
Interesting car, the tailgate on this vehicle is inop, no power window operation, tailgate does not open. Replaced control module in tailgate, and it worked for 3 minutes and then it stopped working again. The module has no bus communication when the system is...
1988 Oldsmobile Toronado Trofeo 3.8L Digital Dash VIN: 1G3EV11C9J
I have been fighting this vehicle for the past 2 weeks. We seem to have the correct voltages in the correct places and correct grounds to this dash according to the print out. We have replaced the central power supply with an after market reman unit and also ...
1988 Oldsmobile Cutlass Calais 2.3L Surge, Cuts out, Stall, MIL Lamp on VIN: 165DGH76J8
i un hooked battery to clear codes becuase i changed o2 sensor why cuase custermer had bought it,fixed vaccums and checked grounds.with in 10 mins. car stalled twice end gave codes 23 air temp sensor open,43 est failure,53 over voltage.same codes was wondering... Trouble codes: 23 (air temp sensor), 43 (est), 53 (over voltage)
1988 Oldsmobile Cutlass Calais 2.3L Stall VIN: 1G56DUN765
car starts and runs good but isant chargeing and when i hooked up my computer to it its freezeing up my screen or just no comunication at all on reading codes or data stream,what gives fix on problem to get a diffrent one,any help thanked ahead of time any que...
1990 Oldsmobile Delta 88 Royale 3.8L no start VIN: 1G3HY54C5L
vehicle came in as a no start found crank sensor to be taped in and broken do to a bad balancer. after repair i found crank sensor has no signal out of it. checked crank and cam sensor has good power and ground voltage drop on the ground is.01. pin out tested ...
1998 Pontiac Grand Am SE 3.1L emissions VIN: 1G2NE52M4W
Have checked out the sensor. with atompheric pressure in the tank the sensor reads 1.3-1.4 V. When running the vehicle and activating the Canister purge and Canister vent solenoids, it causes the sensor to change states. I am thinking it is a intermittent FTP ...
1998 Pontiac Grand Am SE 2.4L MIL Lamp on
hello all this car came from another shop that put all the new stuff in it, it sets a po335 crank sensor code sometimes. mitchell diag. says record freeze frame then clear code let idle 5 mins. or till lite comes, it doesnt set a code again till I drive it 4-5... Trouble codes: P0335
2001 Pontiac Grand Prix GT 3.8L key switch VIN: 1G2WP52K91
intermit key will not go into lock pos. move shifter start and turn car off then it might go to lock were you can remove the key

Fixes & Summaries for GM
Fix/Summary Answers
1992 Chevrolet K2500 Cheyenne 5.7L Stall VIN: 2GCGC29KON
Thanks to all who helped with this truck. Many said to replace the distributor because the magnets can be problematic. We did that and no change. So in summary we replaced the EGR and module, distributor and coil, IAC, Map, plugs and wires, temp sender, tps an...
1995 Chevrolet S10 4.3L Harsh P-D,P-R,1-2 shift VIN: 1GTCS19Z1S
Well,we finally got this one-the guys that mentioned the feeds to the pressure control solenoid were in the know.I didnt bring home the numbers with me but upon checking the voltages feeding said solenoid we found them to be off michells test parameters.After ...
1999 Chevrolet Astro 4.3L trans
thank you for all the good replies. most said to inspect low roller clutch, and a few said to check the fwd roller. could not see any damage, and could not make them slip by hand. replaced both roller clutches, 2/4 band, 2/4 servo pin, cleaned servo pin bore(s...
1999 Chevrolet C1500 Suburban 5.7L speedometer VIN: 1GNEC16R7X
Thanks for all your help We found that the PCM had the wrong gear ratio entered for the flash. So we had to get a new VCI # from GM and then reflash the computor & that fixed the problem. Thanks again for all your Help! Steve
2004 Chevrolet Venture Plus 3.4L MIL Lamp on VIN: 1GBDX23E94
I have not had customer return yet so I could continue diagnostics. Most replies agree that the ftp sensor should read around zero with fuel cap removed witch it didn't. If I get vehicle back that is the direction I will take. Thanks to all for their help. Trouble codes: P0455 (Evap large leak detected).
2000 Pontiac Bonneville SSEi 3.8L interior carpet/trunk VIN: 1G2HZ5412Y
Most of you said to blow out the drains in the sunroof, i can find/reach the ones in the front but not the rear of the sunroof.
2006 Pontiac G6 2.4L warning light VIN: 1G2ZF55BX6
thanks to all who replied. this car was fixed but not by me.i sent it to the dealer because after reading a few replies it was obvious that it was going to take a tech 2 to reprogram the sdm and to rezero the passenger seat sensor after replacement.after talki...
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