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Prev Professional Automotive Repair Technical Discussions for February 23, 2007
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Open Help Requests for GM
Help Request Answers
1992 Buick Eighty Eight 3.8L Cuts out VIN: 1G3HY53L6N
Have a 1992 Buick Eighty Eight with 3.8l came in on a tow truck, would run for about 2-3 minutes die and not start for hours, they said fuel pump. Checked fuel pressure it was ok found no spark. Put a coil on now runs fine except for every couple of hours will...
1993 Cadillac DeVille 4.9L Excessive Emissions VIN: IG6CD53B9P
I've got a Caddy really testing me, PLEASE HELP! It runs very rich, as shown in the gas readings. I've disconnected the fuel regulator hose (no sign of fuel there)& disconnected & plugged the canister hose @ throttle body. I fired the injectors individually & ... Trouble codes: P091
1995 Chevrolet Blazer 4.3L Poor Idle Quality, Hesitation, Surge VIN: 1GNCS13W2S
Got a good head scratcher here ! Coworker took this in trade from a car dealer he has dealt with for years . This is one of the change over models from obd 1 to the obd 2 style .Old style computer with the new style plug in. My brick is the only thing that wil...
1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W1S
vehicle towed in as no start. test spark had weak spark from coil and intermittant spark at some plugs and no spark at others. replace cap, rotor and wires still no diff.test coil driver and ign coil test good but tried known good ones any how still no change....
1999 Chevrolet Silverado 1500 4.3L No Start, MIL Lamp on, When Below 50F VIN: 1GCEC14W1X
Truck will not start at 50F outside temp. Runs good when it does start except for above 2000 rpm, misses, only sets code . Please help . Trouble codes: P1351
2000 Chevrolet Impala 3.8L tcc VIN: 2G1WF55K1Y
i have code p0741 tcc stuck off thiss vehicle had nasty fluid in it when i started looking at it flushed and rt veh code came back on rt tried to follow diag. procedure but scan tool doesnt have capabilities to control tcc pwm i also noticed under trans info o...
2003 Chevrolet S10 2.2L Poor Idle Quality, Hesitation, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1GCCS145X2
vehicle has po172b(fuel system rich) in pcm. During testing found fuel pressure at 70psi at idle-65psi driving. This vehicle is a flex fuel vehicle and we are having trouble finding any pressure specs for the flex in mitchell one. Standard fuel 2.2 liter fuel ... Trouble codes: 172B
1994 Geo Prizm 1.6L Poor Idle Quality, Hesitation, Stall VIN: 1Y1SK5368R
this car came in as a no start found bad wires, tunned up and it started.still did not run good,had a code for the map, replaced sensor this problem is corrected,also found a bad o2 and replaced it, now it reads great. the real problem is when it gets hot the ...
2000 GMC Sonoma SL 4.3L hydraulic brake system VIN: 1GTCT19W7Y
Vehicle came in with a low brake pedal. Brake friction material looked good on this 4 wheel disc system. The fluid in the resevoir was obvisouly contaminated, it was very dark and the rubber seal on the bottom of the cap had swelled to about 3x it's normal siz...
2001 GMC c6500 7.1L caliper VIN: 1GDJ6H1001
Hello heavy truck techs. I got this topkick (tow truck)here that the driver side caliper is too loose. It seems to be missing a shim that goes under the caliper. Nobody list this shim that i can find. It does have one on the pass side. Im in northern ca so if ...
1990 Oldsmobile Cutlass Ciera 2.5L Serpentine Belt Tensioner VIN: 2G3AL54R0C
This Vehicle Came In About Two Weeks Ago With Anti Freeze Leaking From Behind Serpentine Belt Tensioner Thought It Would Be An Easy Fix.When I Called Around For A Gasket Parts People Said There Is None Availble. So I Used RTV Silicone To Seal Up. At Time Of Fi...
1997 Oldsmobile Aurora 4.0L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G3GR62CXV
customer came back complaining of stalling after previous work was done road tested with customer vehicle stalled in parking lot during parking manuvers got vehicle back inside found code p1599 stored in computer did diag for code found bad idle air control va... Trouble codes: P1599 (cc power management or engine stall), P0507
1999 Oldsmobile Alero GL 3.4L Poor Idle Quality, Hesitation, Stall VIN: 1G3NL12E3X
I have a tricky one. I installed a used motor out of a 2000 grand dam into this 99 alero. i'm having a momentarly stumble when the throttle is snapped, with an intermittent stall in gear, under load. fuel pres good, i've swaped tp, map, iac, rear cranck sensor...
2001 Oldsmobile Bravada 4.3L Excessive Emissions VIN: 1GHDT13W31
Can't put fuel into tank, tank pressure will not allow fuel to enter the tank. All vapors and pressure are vented through the canister, there is not a separate vent tube on the filler neck. Checked filler neck for obstructions, inlet valve at the tank, all loo... Trouble codes: P0446 (EVAP Vent Control Problem - Cant Sense Any Pressure.), P0462 (Fuel Level Sensor Curcuit Signal Low), P0463 (Fuel Level Sensor Curcuit Signal High)
1998 Pontiac Grand Prix GTP 3.8L Powertrain VIN: 1G2WP5213W
This car won't stay fixed...After previous repairs were completed. From a stop, when you accelerate to WOT, tires will spend and than engine will bogg down, lose power until you release accelerator and reaccelerate it will drive normal... This only happens fro...
2001 Pontiac Aztek 3.4L Accessories VIN: 3G7DA03EX1
Hi, folks. This vehicle initially came in with a no crank condition and the check engine light staying on. Oddly, no other dash warning lights would come on with the key on like they should. Codes U1040, U1000, U1064, P1626, P0463, P1189. Chasing communication...
2003 Pontiac Grand Prix GT 3.8L key cylinder VIN: 1G2WP52K53
this car will not allow you to turn the key backward from the unlock position so you can get the key out.i tried changing the white electrical solenoid (an ignition lock according to the dealer) and it seemed to fix it at first but now does the same thing. int...

Fixes & Summaries for GM
Fix/Summary Answers
1970 Chevrolet El Camino 350CID timing cover incorrect
Most responses directed me to a gasket /seal set that includes 2 different lower front seals (there are TWO different designs of oil pans depending on year models) appearantly this has a 74-81 or so engine with lots of Tiwan chrome stuff. I guess my mind was i...
1982 Chevrolet Corvette 5.7L No Start VIN: 1G1AY0783C
Well, the Queen is gone, back on the trailer for another show. Both pumps had failed electrically(open circuit), found no problems in wiring & new pump was ruunning at 4.8amps max. Customer stated battery would be dead after a couple of days sitting around so ...
1998 Chevrolet K1500 Cheyenne 5.7L airbag VIN: 1GCEK19R1W
george from california appears to win the prize for nailing the culprit. Ordered new airbag from dealer and lite is out. wreckers obviously not the place to order these components from. thnx to all who replied.
1998 Chevrolet Camaro Z28 5.7L No Start VIN: 2G1FP22GXW
Thanks for all the replies, found faulty ground circuit B1 for ignition relay, located in cell 14 at splice 112.Thanks again for all the replies.
1998 Chevrolet Cavalier Z24 2.4L Cooling Systems VIN: 1G1JF12T2W
Thanks to everyone who replyed to my problem.There were many good suggestions.The customer is taking the car to have the coolant system power flushed.I will let you know how that works out,again Thank You ALL
1998 Chevrolet C2500 Cheyenne 5.0L Fuel Gauge
Thanks for the many replies. It was my first help request and information just flowed in. Anyway, I tested the problem down to the ECM/VCM but the customer declined to buy a new one at this time. I got several replies of people that did replace the VCM/ECM and...
1999 Chevrolet Venture 3.4L abs , brake warning light VIN: 1GNDX03E9X
well, it finally is done, the master cylinder/hydraulic unit was at fault, the light is out and all is well, thanks for the responses!!!
2001 Chevrolet Suburban 2500 8.1L Fuel Gauge VIN: 3GNGK26G91
We have been waiting for customer to bring back car so that we could do some more testing.Got some good info on testing the relay and module on frame rail from Raymond in N.C..Also want to do alittle further inspection of rear fuel tank and its sender.We will ...
2001 Chevrolet Silverado 2500 HD 6.6L Hesitation, Cuts out, MIL Lamp on VIN: 1GCHC29131
first off thanks to everyone who replied. yes i do have this thing fixed. kudos to the ones who said to check all air tubes and clamps using my smoke machine i found a hole about 1\4 inch in dia. in the lefthand side air tube down by the power steering pump .s... Trouble codes: P0234 (turbo boost out of limits overspeed condition), P0101 (maf out of range).
2003 Chevrolet Impala 3.4L Poor Idle Quality, cooling fans VIN: 2GIWF52E03
well this car is finally fixed. i exhausted all test i could find, none of which led me to a bcm. but that was the problem. i just wish i could now why? thanks to the 8 of you who replied. i used all of your suggestions to at least elimnate one item at a time.... Trouble codes: P0507.
2003 Chevrolet S10 2.2L oil pressure VIN: 1GCCS14H03
thanks to all the good help. oil was dumping from around the no.# 3 & 4 cam bearings. for some reason the cam bearings moved about a quarter inch. we will be installing a new short block. thanks to all helped
1992 GMC Jimmy SLE 4.3L low power VIN: 1GKDT13W9N
most replies thougt cat converter, but we had back pressure tested and ran with the o2 sensor out and it didn't help. after triple checking everything we replaced the injector even though it ohmed good, pattern looked good, and flow checked the same as another...
1997 GMC Savana 3500 6.5L Losing speed signal VIN: 1GTHG35F5V
Sorry about the wait guys. The problem is that I only get to work on this thing about an hour at a time because the other builder is away on holidays and I have alot on my plate. That aside here's the scoop. I checked everything, changed the buffer, rechecked ...
2003 Hummer H2 6.0L oil system VIN: 5GRGN23U63
Well now that everything is back to normal this problems seems very elementary! I realize that all pressure starts at the pump and excluding pump pick up screen problems-this engine is extremely clean-I was pretty sure which way to go. This is the first cranks...
1999 Pontiac Grand Am GT 3.4L pump rack VIN: 1G2NW12E5X
Well customer does not want ot spend money on a guess, I did not get a reply on how to test valve, Im not giving up I just don't want ot keep this open any longer. thank you
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