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Prev Professional Automotive Repair Technical Discussions for August 25, 2005
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Open Help Requests for GM
Help Request Answers
1993 Buick LeSabre Custom 3.8L abs electronics VIN: 1G4HP53L9P
Please help me here!!! This Buick came in with ABS light on, code 45 stored (power interruption fault). Checked TSB's and found one that had an updated test procedure. So I printed the old and the new test procedures and went to work. On the new test I got to ...
1993 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD13B7P
ok first let me say thanks all this car fails loaded mode smog test nox limit is 687 has 1228 15 mph, vacuum signal is good at 15in pluged, but only 2 in when conecet to valve, if i restrict the exhause by 25-30 % then i get 14 in vacuum to valve and nox drops...
1994 Chevrolet K2500 Cheyenne 6.5L Hesitation VIN: 1GCGK24F1R
Long Post. We work on large amount of diesels but this one has me stuck. Vehicle regularly serviced here. Some of these may be out of order. Vehicle came in with no start condition. No codes in system at any time. Injector pump frozen up and sheared off roll p...
1994 Chevrolet Lumina Euro 3.1L Poor Idle Quality, Surge, Cuts out, Misfire, Hard start when hot VIN: 2G1WN54T6R
I hope you guys can help me. Car came in about a week ago customer said it was running rough, hard to start when hot and black smoke.Idid a miner tune-up,Ijection cleaning and replaced the o2 sensor(seemed to be working slow)Now it is back I have went over thi...
1996 Chevrolet Express 1500 5.7L fuel gauge VIN: 1GBFG15R8T
This is my sisters conversion van. We had replaced the fuel pump back in January(pump had died). Ever since we did that pump the fuel gauge couldn't be trusted. It would always read above a half a tank. She wasn't worried about that and just filled up every 20...
1997 Chevrolet Tahoe 5.7L Misfire, MIL Lamp on VIN: 3GNEK18ROV
Thanks in advance for any help this one is driving us nuts Lite came on after engine install misfire monitors on cyls 1 and 6 indicating misfires.checked cmp retard ok @ 0 degrees.Had already replaced items listed to prevent common problems from occuring.Engin... Trouble codes: 300 (Random Misfire)
1997 Chevrolet Blazer 4.3L Poor Idle Quality VIN: VINW4.34WD
Bad shake at idle seems like misfire but no misfire counts and no codes Truck accelerates great ton of power I would think balancer or torque converter out of balance but Vibration not { as } noticeable at higher rpm it seems to smoth out slightly. If it was a...
1998 Chevrolet Malibu 3.1L alternator VIN: 1G1NE52MOW
Checked altrnator on car and on test bench-no out put. Have an alternator on order. Per customer, alternator replaced about two weeks ago,then batt light came on and batt ran down. Per MOD,suppose tohave batt voltage on red wire to L terminal with key on--chec...
2000 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 2GCEK19T7Y
truck came in with code p0157(low voltage b2s2)i verified voltage drop on all wires pertaining to affected sensor.intake gasket and pcm were replaced with no avail.also notice truck is sometimes hard to start(flooded)after sitting for a bit.voltage for o2 is a...
2000 Chevrolet S10 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCC51445Y
hello. Ive got one here that makes one consider a careir change. This truck came in blowing white smoke and missfiring on cyl num 4 . found a blown head gasket and degraded plug wires. repaired head gasket including milling it 5k. replaced plugs and wires as w... Trouble codes: P0304
2000 Chevrolet Malibu 3.1L lacks power VIN: 1G1ND52J3Y
Hello fellow GM techs,I'm a GM guy with a strange one.Thanks in advance for reading this post.Vehicle lacks power at 35 mph up a moderate grade.Hard to describe other than feels just like a plugged up catalytic convertor or late ignition timing?You have to kee...
2003 Chevrolet Tahoe LT 5.3L MIL Lamp on VIN: 1GNEC13Z53
truck came in with check engine light on.Scanned computer found code p0341(camshaft position performance). checked connectors and no problems were found. also checked signal from sensor to computer with lab scope. signal looked pretty normal. replaced sensor w... Trouble codes: P0341 (Camshaft position sensor performance), P0343 (Camshaft position sensor circuit high voltage)
2004 Chevrolet Colorado LS 3.5L Lighting VIN: 1GCDT19604
guys i have a 04 colordo a body shop brought to me with the hazards blinking all the time. the body shop said he replaced the hazard switch with no change. i disconnected the hazard switch no dif i removed the wire from the bcm no dif. then i hooked the test l...
1991 GMC C2500 Sierra 7.4L Excessive Emissions VIN: 1GTGC24N5M
i think i am missing somthing on this one. it failed for high nox so i started checking the egr valve. the valve was getting no vaccum off idle and cruise on the dyno. vaccum to the solenoid is 14 inches and out of the solenoid is 0. i can feel a small pulse o...
1993 GMC Sonoma 2.8L clutch VIN: 1GTCS19R39
Hello: This 1993 GMC Sonoma came in for a replacement clutch due to excessive wear; it was beginning to slip under load but otherwise the transmission was shifting properly. We installed a new clutch kit (Luk), clutch master cylinder & slave cylinder (Raybesto...
1996 GMC K1500 Sierra SL 5.7L headlights VIN: 1GTEK19R3T
can any one tell me the location of the drl module and the drl relay the the high beam headlights and the drl lights work but the low beam do not work with the switch in the on pos the high beam work normal the turn signal multi funtion switch has been replace...
1996 Oldsmobile 88 Royale 3.8L windows, locks fuel pump VIN: 1G3HN52KXT
unusual vehicle..high mileage,well maintained. car came in on a hook from freeway. cust states car died while passing a truck. initially found no power @ fuel pump. but further inspection also found that the power windows were inop. the door locks will not wor...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52L1R
Hi guys Have received 12 replies.Most advise to check ign lock cyl .Cyl and key OK. Still no start. Scanner showes theft status on when cranking and sets code p1629. But if I unplug injector harness and crank engine theft status off and no code sets.Ihave chec... Trouble codes: P1629.
1999 Buick Century Custom 3.1L door glass VIN: 2G4WS52M3X
had some very good sugestions on this car, we checked the wires in the doors and all were ok, we played with the window switch , and even replaced it. We did get the car overnight earler this week, nothing happened. We are trying to get the lady to leave her c...
1995 Chevrolet S10 2.2L Excessive Emissions, No Start, Poor Idle Quality, Stall VIN: 1GCC1445R8
I sent this PU away thinking I had done all I could. I put a fuel pressure regulator on, Nothing. New computer, crank senlor, still same, I will ask the place it was sent and write back with the fix. This isn't the first time they bailed me out of a deap probl... Trouble codes: 33 (Map- Voltage High).
1996 Chevrolet Express 3500 6.5L pressure control solenoid VIN: 1GBLP37FXT
Hello all, Thanks to everyone for the ideas.I checked over every single thing related to the tranny and only found two possible problems.The main plug at rear of tranny has a poor fit(easily pushed into tranny and a possible bad ignition switch(1 loose termina...
1995 GMC C1500 Sierra SL 6.5L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GTEC1952S
As far as I can tell this one is fixed. I repaired alot of other problems such as turbo solenoid innop, EGR vent innop, EGR vacuum line cracked, EGR plugged,some vacuum lines mixed up, an innop lift pump relay,an innop baro sensor, and an extremely overdue oil...
1997 GMC C2500 Sierra SL 5.7L speedometer VIN: IGTGC29R9V
Larry from Texas gets the cigar this time;his was the only reply and he was right on top of it. Broken wire inside the insulation near the speed sensor. Thanks, Larry
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