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Prev Professional Automotive Repair Technical Discussions for August 20, 2005
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Open Help Requests for GM
Help Request Answers
2000 Buick Century Limited 3.1L pump motor ckt. VIN: 2G4WY55J7Y
This is the second Buick that had come in with this code. I'm using a TECH 2 scanner and I try to clear code, it does not. Try to perform sysyem check, cannot because there is a code in system. Go to ABS moduale and disconect harness to check for corrosion and...
1989 Chevrolet Beretta GT 2.8L No Start VIN: 1G1LW14W9K
This beretta was parked about a year ago because of a tcc problem and a bad fuel pump. The car sat for about a year then when had need to fix the car the fuel pump, tank, and sending unit were replaced. Car then did not start. Now I have replaced the crank sen...
1998 Chevrolet Astro 4.3L Hesitation, Stall VIN: 1GNDM19W4W
Vehicle came in with no MIL,new fuel pump and filter and the same symptom as before he had fuel pump and filter replaced. Started out as an intermittent hesitation on acceleration. Fuel pump was making alot of rattling noise at idle. I condemned new fuel pump ... Trouble codes: P0171 (lean snsr 1 bnk 1), P0174 (lean snsr 1 bnk 2), P0507 (iac system - rpm too high)
2000 Chevrolet Silverado 1500 5.3L ABS Module VIN: 16CEK19T4Y
This truck came in with the ABS light on. The ABS system was inoperative. My scan tool (Gynesis 2003) would not communicate with the EBCM. I replaced the module and pump assy. The ABS will now go into ABS stops on the lift as well as when driving and forcing a...
2005 Hummer H2 6.0L no compressor engagement VIN: 5GRGN23U25
Hi Guys Does anyone have the air conditioning wiring schematic for this H2? Another shop added accessory lights and now the compressor won't engage. It has automatic climate control and all the other functions appear okay. Fax # [...]. Thanks in advance...
1996 Oldsmobile Achieva SL 2.4L auto transaxle 4T60E VIN: 1G3NL52T7T
Custoner complains of occasional 3rd gear starts. No trouble codes are present. I have checked power and ground circiuts and found no problem. I have driven this car home for the last 2 days and it did not act up, no problem found. Any suggestions where to loo...
2000 Saturn SL2 1.9L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G8ZK5272Y
cust states that engine stalled after cold start one morning. must keep feet on brake and throttle when come to stop or engine will die. using snap on scanner, engine will not respond to idle up or down command. 1ac counts are approx 140 when engine is idling ... Trouble codes: P0506, P0509, P1599

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Century Special 3.3L Excessive Emissions VIN: 1G4AG55N4P
Well, thanks to all who replied. As I had suspected, the MAF did have a problem. Dave [...] hit it right on the head. Although the readings looked good, when I took the MAF out, it took a magnifying glass to see the problem. A tiny...I mean tiny piece of the ... Trouble codes: 44 (System Lean History Code none current.).
1965 Chevrolet Imapla 327CID vacuum control VIN: 164395A134
Thanks to all who responded to my request for info regarding the A.C.vacuume diagram on a 65 Impala.I got under the dash of it yesterday and was able to find and repair three 'missing' lines.The line that now goes to the expansion valve has increased A.C. perf...
2002 GMC C-Series Topkick C6H042 7.2L No Start VIN: 1GDJ6H1C02
Cat engine was fine, turned out to be GMC/operator problem. If you didn't know, this was a tow truck. Someone wired in amber warning lights into ign #1 under stering colum. Because of the twisted wires & electrical tape, there was no voltage to turn on Cat ecm
2002 GMC Envoy SLE 4.2L No Start VIN: 1GKDS13222
Thanks to all that replied to my cry for help. The problem was with the throttle body. As this was my first one of this sort it kinda kick my but for a while until it was explained to me how the system worked. Here in the Bahamas we don't have a GM dealership ... Trouble codes: P1220 (Throttle Position Sensor 2-low voltage), P1120 (Throttle Position Sensor Circuit-Intermittant High Voltage).
1984 Pontiac Firebird Trans Am 5.0L convertor, pump VIN: 1G2AW87H2E
well unbeknownst to me they have a slpit year on this car. i had an early year 1984 when they had 27 splines on the input shaft, the convertor i was given had 30 splines and it was just bouncing away inside the convertor. i guess live and learn i had no idea t...
2002 Saturn SC2 1.9L Cuts out VIN: 1G8ZY12792
We dropped the fuel tank and found a ground wire not making good contact. We reconnected it and everything works like it should. I have seen the car running around town so all must be good.
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