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Prev Professional Automotive Repair Technical Discussions for June 6, 2007
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Open Help Requests for GM
Help Request Answers
2003 Cadillac CTS 3.2L Cooling Systems VIN: 1G6DM57N63
Thanks in advance. This Cadillac has a vey slow coolant leak . Turned light on in 7 monthes and was a quart low tuning on the low coolant light on. Any help would be appriciated. Mike P
1977 Chevrolet Corvette 5.7L engine VIN: 1Z37X7S445
bought car with 68,000 ran hot decided to go completely through motor and trans on frame restoration motor bored 030 over all new components went through gm on most things because of L82 being diff on some things. os temp around 80 degress. not running ac temp...
1988 Chevrolet Camaro 2.8L Blows coil VIN: 1G1FP21SOJ
The car came in on a hook. Found no-fire condition. Tested ignition module, coil, pick up, and coil wire. Found coil bad and harness from coil to distributor was all but broken(from someones test light). Called customer and they said that the coil has been rep...
1998 Chevrolet K1500 Cheyenne 5.0L Cuts out, Misfire, MIL Lamp on VIN: 1GCEK14MXW
I received this K series truck after it has been rode hard and sold at the auction! Lucky me! It misses under a load on acceleration all the time. It seems to idle OK. It sets a P-0339 CKP sensor a signal every time. Someone replaced the sensor, I removed it a... Trouble codes: P0339, P0341
1999 Chevrolet Blazer 4.3L Poor Idle Quality, Hesitation, Stall, Poor Fuel Economy VIN: 1GNDT13WXX
hi there this started out to be minor and got worse noticed poor gas mileage and did tune up with no change in mileage often hesitates and stumbles had i 1 mil pop up for system lean bank 1 but it smells rich and just this week i smelled rotten egg and a rattl... Trouble codes: P0171 (fuel trim system lean bank 1)
2004 Chevrolet Silverado 1500 5.3L MIL Lamp on, NO ACELERATION VIN: 8ZCEK14T04
Hi This pick-up has this problem intermitingly. When the mil lights it reads U0107 code and quits accelerating. If I reset the ecm it runs fine for a while. I tried a throttle body actuator with no results. I have not been able to find information on this code... Trouble codes: U, 0107 (Lost comunication w/throt actuator Ctrl Mod)
1997 GMC Savana 3500 5.7L Power steering VIN: 1GTHG35R8V
This van is baffling us. A fleet customer has had a problem where the power steering assist will quit when driving. By the time the van is towed in, the power steering is working OK. This time the driver (new driver, has only driven van for 4 months) claims pr...
1997 GMC C2500 Sierra SL 5.7L Brake pull VIN: 1GTFC29R3V
Hey guys and gals. We are having a problem with this truck pulling to the right. We replaced hoses, calipers, pads, and machined the rotors and pressure bleed system, checked the caliper clearance as to the TSB, still pulling. We hooked up our brake pressure g...
2003 GMC Sierra 2500 HD SLE 6.6L hot re-start problem VIN: 1GTHK291X3
Fellow techs.: This one has been dropped in my lap by the boss. This problem began occurring last winter when the truck was on a run to New Mexico. I am told that it sat outside one night when the temperature dropped to -2 degrees Farenheit. Both batteries a...
1990 Oldsmobile 98 Regency 3.8L No Start VIN: 1G3CX54C9L
This one is tough. I have the car in the shop and let it run till it is at operating temp, shut the key off and try to restart and it won't start. Checked fuel pressure-ok, fuel pulse-none, spark-none. i have gone through all the tests for ignition module, coi...
1998 Oldsmobile Aurora 4.0L tachometer VIN: 1G3GR62C4W
after replacing head gaskets and dropping cradle ass. tachometer jumps as if the needle was getting a power surge. idle is smooth and steady. i replaced ign module and both crank sensors with known good ones.checked secondary ign wires for close routing to pri...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Riviera 3.8L Hesitation, Stall VIN: 1G4GD2213S
thanks everyone for their help. the vehicle finally returned and we were able to get it running good. a [...] egr valve took care of the hestitation problem. thanks again to everyone. Trouble codes: P1670 (quad driver 4).
2000 Buick Regal LS 3.8L Excessive Emissions, Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2G4WB55K7Y
Finally narrowed problem to a computer problem to do with the #3 injector circuit. The problem had become very intermittent and the customer did not want to put a computer in the car yet. So she took the car and so far have'nt heard back from her. Thanks for a... Trouble codes: P0203 (injector circuit malfunction - cylinder 3).
1993 Cadillac Seville STS 4.6L Poor Fuel Economy, MIL Lamp on VIN: 1G6KY5299P
Sorry, I thought I closed this request. First, THANKS GUYS! Michel, Stephen, Paul/TN, Allen, Paul/PA, Jason, Phillip, Mark, and Jay. Allen had a good point on the alternator. The AC ripple was terrible and was causing some flicker in the lights. We replaced th... Trouble codes: P0041.
1997 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W3V
Well, since the problem was intermittent to begin with, I am not completely sure whether I fixed it, or not. In any case, I posted my original request for help on a rainy Friday, and when we came back on a beautiful clear Monday, the car started right away, ...
1998 Chevrolet C1500 Cheyenne 5.0L Heater Core VIN: 1GCEC14MOW
Thanks to Darrell [...] the vehicle is gone and has not returned as of yet. I installed the restrictor in the heater hose and flushed the cooling system, just to cover all bases. I didn't even know about an in-line restricor, because the connector on the intak...
1999 Chevrolet K1500 Suburban 5.7L MIL Lamp on VIN: 1GNFK16R1X
tom thank you i re ck ppl wire and found at ho2s connector pin had bad connection. pinch female pin. and working good. agine thank you have good day. Trouble codes: P0160.
2000 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14W8X
this truck is fixed... After reading about the antitheft and alarm system it says when R&Ring the BCM or PCM Which the other shop did, u must do a key relearn that takes abuot 30 min. Oh yeah the customer also forgot to mention that the ignition lock cylinder ...
2002 Chevrolet Venture LS 3.4L open monitors VIN: 1GNDX03E52
Thank you to all who responded. Out of frustration I gave this vehicle to the customer and told them to use use it for a few days and see what happens. I got it back yesterday and evap had closed.I did not expect it but to say the least was happy to be able to...
2002 Chevrolet Camaro Z28 SS 5.7L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 2G1FP22G52
Thank you for the replies recieved. The problem turned out to be a plugged r.h. catalytic converter. I would have never expected a converter due to the fact that it just did not react like a restriction. GM replaced converter under warranty and it runs fine no... Trouble codes: P1416 (air system fault bank 2).
1994 Oldsmobile 88 Royale 3.8L code 341
Replaced pcm, no codes & haven't heard from customer. Customer picked up vehicle on Friday. Closing this file on the following Wednesday. Thanks guys.
1993 Saturn SL1 1.9L Poor Idle Quality VIN: 1G8ZG5597P
well we fixed the problem by rechecking vac leaks. turns out the vac port block at back of throttle body was leaking. replaced port assembly and problem fixed Trouble codes: 26 (qdm fault), 45 (rich exhaust).
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