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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 29, 2005
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Open Help Requests for GM
Help Request Answers
1995 Buick Riviera 3.8L Poor Idle Quality, Poor Fuel Economy, MIL Lamp on VIN: 1G4GD2212S
hello there again.this riv. is kicking my butt.some problems i think are from the cust. used parts but here we go.car doesn't have the power it should and at an idle at stops it lopes like a car with a cam.scan data says 171 lean and 134 i think but that is ca... Trouble codes: 171 (lean)
1985 Chevrolet Corvette 5.7L Stall VIN: 1G1YY0783F
fuel pump pressure & volume test great, fuel filter is clean - spray throttle body cleaner in pcv hose, engine runs - tested injector circuit, power to both sides but do not pulse - engine grounds are good as well as all power circuits to ecm - circuit 430 to ...
1993 Chevrolet K1500 Cheyenne 5.7L all shifts VIN: 2GCEK19K6P
Hello fellow techs; This truck has a wierd transmission shifting problem; it shifts way too soon. When the truck first came in we scanned for engine/trans codes and found none. Test drove for roughly 5 miles under all driving conditions and it shifted normally...
1998 Chevrolet Tracker 1.6L MIL Lamp on VIN: 2CNBE1862W
This car is the first time to come into my shop.The check engine light on,we got the code p0400. Then we replaced egr back pressure sensor.egr bypass valve.egr solenoid vacuum valve. After that we cleaned the trouble code. After 3 weeks the customer came back ... Trouble codes: P0400
2001 Chevrolet Tahoe 5.3L Drive-axles VIN: 1GNEK13T61
Got a slight buzz/whine noise that occurs once at 15-20 mph. Noise seems to come from brake booster/firewall area. Will only do it once following start up, but if you stop and restart the vehicle it will again make the noise as soon as you hit the 15-20 mph th...
2005 Chevrolet Cavalier LS 2.2L torque pull VIN: 1G1JF14F75
Vehicle was in minor collision in front. Replaced upper tie bar rt headlamp, frt cover etc... no structural or suspension damage. A 4 wheel alignment was performed - Lt camber: -1/8, Rt camber: +1/8, Rt caster: +3 1/2, Rt caster: +4 Toe: 1/32``. Rear: camber b...
1988 GMC C1500 Sierra 5.7L Cuts out VIN: 1GCDC14K3J
Hi guys I have a nightmare on what is usually a very simple trouble free system. Customer brought truck in claiming it cut out at times. He had had new fuel pump, fuel filter, wires, plugs, cap, and rotor installed, Scoped truck and found ignition pattern was ...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Chevrolet C1500 Cheyenne 5.0L Mechanical VIN: 1GCDC14H2J
Thanks everyone, had many replies most with different ideas which is helpful. After checking everything 3 times. Took plug off rear of abs dump valve checked for fluid presence none found.Talked to customer, advised of condition and would have to eliminate dum...
1997 Oldsmobile Aurora 4.0L Misfire VIN: 1G3GR62C0V
First, Thanks to all that replied to this post. I am not able to say what fixed this problem as customer is not willing to do so. I'm sure we have all heard this one 'I'm going to sell this piece of *@#)' no wonder I will never buy a used car. I failed to meti... Trouble codes: P0300.
2000 Pontiac Grand Prix GT 3.8L TCS light on steady VIN: 1G2WP52KXY
As a couple of people pointed out, there are 2 data lines. UART and Class 2. Tech2 was able to communicate with both the PCM and EBCM, so I ASSumed that the UART data line was not broken between EBCM and PCM. BUT the scan tool was talking to ABS on UART and PC...
2001 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NF52T61
Thanks for all your help guys, i found i was losing power to the ignition module and traced it back to a bad ignition switch. Car has started perfectly every time since i replaced the switch and my customer is happy.
1999 Saturn SC2 1.9L MIL Lamp on VIN: 1G8ZY1278X
The problem ended up being the signal ground for the O2 and the heater ground (to pcm) were in the wrong place in the connector. The wires were the same in the original O2 sensor as were in the replacement. My only explanation is that the two wires went out,... Trouble codes: P0141 (HO2S Heater Control circuit sensor 2).
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