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Prev Professional Automotive Repair Technical Discussions for February 23, 2010
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Open Help Requests for GM
Help Request Answers
1995 Buick Park Avenue 3.8L Performance VIN: 1G4CW52K3S
This Buick came in not running needed timing chain and gears.After would not start There was some water in oil also found that the plenum was leaking and the lower intake was worped had it reserfaced and replaced the plenum. Started and ru n real good but then...
2002 Buick Rendezvous CX 3.4L gauges, dash lights, exterior lights VIN: 3G5DA03E32
Vehicle came to me with an ocassionally dead battery. Without too much time spent I realized that sometimes after shutting the key off the headlights would never shut off. Then I noticed when this happened the the gauge lights and gauges would be turning on an...
2004 Cadillac SRX 3.6L rear lighting VIN: 1GYDE63744
This is a weird one! I have this cadillac that has brake lights on all the time with the headlights on. No L/R signal anytime, and R/R working for both sides with the headlights turned off! If you follow me you can understand my frustration. I can turn the mul...
1991 Chevrolet Corvette 5.7L Poor Idle Quality VIN: 1G1YY3388M
Hello thanks for you help i got this corvette and it has a high idle double what it should be it is bout 2500-[...] and will not slow down i have replaced the iac there was very little difference but i got the idle to be stable at 2000 rpm but still way to ...
1996 Chevrolet Lumina 3.1L high idle VIN: 2G1WL52M4T
Hello, the iac will open to raise idle but will not close to lower idle. If engine is shut down and then restarted the idle will be normal. I can raise idle with my scan tool but when I command it to lower idle it will not. there are no codes
1998 Chevrolet K1500 Silverado 5.7L brake booster VIN: 1GCEK19R2W
I feel really stupid to post this question. The brake booster makes the standard whoosh/venting noise, that we've all heard a thousand times, every time you step on the brake pedal & there is no braking problem. I initially told the customer it was normal "the...
2002 Chevrolet Silverado 2500 HD 6.6L fuel in oil VIN: 1GCHK23158
Third time around with this pig! Fuel getting into the oil! Have installed updated "new" injectors. Replaced 2 pressure lines to 2 of the injectors due to poor sealing area at the line. Return line/rail shows no signs of leaking. Any history of the injecton pu...
2004 Chevrolet Tahoe Z71 5.3L 2-3 shift VIN: 3GNFK16Z64
Hi, Could use a second opinion, I'm not real familar with the 4l60e trans. Vehicle has rpm flare on 2-3 shift, about 300 to 500rpm for about 1 to 3 seconds. Also on 3-2 kickdown on acceleration this is worse, about 1000 rpm. Checked maf sensor, checked good. c...
2006 Chevrolet Malibu LS 2.2L MIL Lamp on VIN: 1G1ZS51F06
This car has a SES light on with the two codes listed above. I have been on the phone with GM TAC. I reflashed ECM. I have put two stats in and flushed system twice. TAC is saying they have numerous problems with poor coolant flow due to restricted heater core... Trouble codes: P0128 (Temperature below threshold), P2119 (Closed throttle position performance)
2006 Chevrolet Uplander LS 3.5L Brake lights VIN: 1GNDU23L36
van was brought in with inoperative brake lights, turn signals/hazards use same bulbs and they work with the dash switch and also commanded by tech 2. it has a few codes in the bcm for brake switch circuit low, along with a C0870, according to alldata the brak...
2006 Chevrolet Uplander LT 3.9L Hesitation, Surge VIN: 1GNDV33116
Customer came in complaining vehicle would buck on decel at about 30-40 m.p.h and also the tach would move erraticaly at 55-60. I felt the concern but while accelerating between 30-40. Did notice other concern with the tach moving about 200 r.p.m. while at 55 ... Trouble codes: P0011
2007 Chevrolet Avalanche LT 5.3L airbag light VIN: 3GNEC12J07
hi techs. this truck has the air bag light flashing all the time. checked for codes found a p1860, drivers lumbar position sensor circuit. daignosed wiring etc,function test, no problems founnd. cleared codes and it didnt return ,but airbag light is still flas...
1995 GMC K2500 Sierra SL 6.5L No Start, Stall VIN: 1GTGK29F8S
greetings fellow techs. This truck has a stalling problem when warm. Seems to run fine cold.has not reset any codes.looking thru the archives it seems either injector pump or driver is at fault. driver was replaced 65,000 km ago and with the price of a new pum... Trouble codes: 18 (pump cam ref), 23 (tps pos 1), 35 (injector pulse width), 54 (to fault), 78 (wastegate solenoid), 87 (high ratio)
1996 GMC C3500 Sierra SL 5.7L Misfire, Poor Fuel Economy VIN: 1GDJC34R7T
when this truck came in the shop it was backfiring and stalling after replacing failed components and setting timing back to 0 tdc the truck would not start eventualy i had to set timing back to the previous position wich was just before cylinder 8 at tdc afte... Trouble codes: P1345
2004 GMC Sierra 2500 6.0L glow plug module VIN: 1GTHK24284
veh. blows #1 edu fuse underhood intermittently causing veh. to stall, it is then a no start until the fuse is replaced. it will blow soon thereafter and create the same issue. dtc's resident in pcm because of this were: u0105-lost comm with injection pump mod...
2004 GMC Yukon XL 1500 SLT 5.3L Hesitation, Cuts out VIN: 3GKFK16Z14
Vehicle came to us on tow truck. customer stated he was driving and heard a clunk noise then lost all forward gears. this happen around christmas time so the vehile sat in his yard until 02/22/10.When we got the vehicle it only has reverse. Replaced transmissi...
2007 GMC Yukon Denali 6.2L no crank VIN: 1GKFK63837
Thanks in advance for the greatest tool ever. Last week this vehicle was towed in no crank, tech removed the starter relay to test when he put it back in it started so we installed a new relay. Customer called next day no crank so I had him pull the starter re...
2001 Oldsmobile Alero GL 3.4L radio VIN: 1G3NF52E21
Gm Guys help, the veh. has a battery draw of 2.5 amps and the radio display is inop., the only way to get the draw to go away is to, unplug the bcm, and radio, if you unplug just one, the draw is cut in half , but still there, we want to replace the radio 1st ...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Century Custom 3.1L Excessive Emissions, Hesitation, Surge, Cuts out VIN: 2GWS52M1W1
Well after pulling my hair out, i finally fixed this thing.I put an old egr valve on it and that fixed it.Ordered a new egr valve installed it and the car runs great.Thanks again for the help.
2001 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y31
customer picked up vehicle.vehicle always started and could not get to act up.several replies were for ignition cylinder,theft module,and several for bad connections.thanks to all who offered help. Trouble codes: B3055, B1327.
1992 Chevrolet S10 Blazer 4.3L Start / Stall VIN: 1GNDT13W6N
We'll Gentleman, I had my son pinout this trucks ECM out before but forgot, we might have two or three in here @ a time doing pinouts and they all blend together. Redid Under load on power and grounds and voltage drops to Injector all check out fine. I kept te...
1996 Chevrolet Camaro Z28 5.7L abs / asr VIN: 2G1FP22P3T
Hey guys, after many hours of second guessing my test results due to limited information on this system the shop next door had another 96 z28 arrive in their life so they let my borrow the ebtcm to try just incase the used one i got from the wrecker was no goo...
2000 Chevrolet Venture LS 3.4L Engine VIN: 1GNDX03E9Y
Ty all, i mean it sincerely... from the smallest of infor to those who give a detail guide. Unfornately the manager choose to fix the internal leak rather than replace the engine, because for some reason the company except resposiblity...i choose not to get in...
2005 Chevrolet Silverado 2500 HD 6.0L No Start VIN: 1GCHK29U35
Sorry for the delay in closing this. Thanks for all the replies that everyone took the time to send.My tech that has moved on to bigger and better things over thought this big time. Once i took over it was pretty cut and dry.I checked for juice to the starter ...
2005 Chevrolet Equinox LS 3.4L rear drive shaft VIN: 2CNDL73F25
1998 GMC K1500 Suburban 5.7L transfer case VIN: 3GKFK16R4W
well after going nuts with this vehicle i removed wiring harness for the entire system found two wires rubbing on transmision case repaired harness and reinstalled harness and it all works thanks again guys.
1997 Oldsmobile Aurora 4.0L Intrument Cluster VIN: 1G3GR62C3V
Thanks to all who replied. The bulk of the replies suggested a faulty headlamp multifunction switch. I was very leary of this due to the cost of replacement if wrong. Roughly $700.00 plus labour to the customer. I was able to get the shop dark enough to fool t...
1999 Oldsmobile Intrigue GL 3.8L horn VIN: 1G3WH52K4X
sorry that i have not closed this posting.however the customer has chosen not to fix the car.to all that responded thank you and for what it is worth i think all of you where right.well you can't sell them all,the horn pad/air bag would have cost the shop $600...
1997 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZK5277V
Thanx again everyone. Veh was fixed and I didnt know it! For P0711 to properly clear veh had to cool down so all 3 temp readings were the same. Unhooked the battery lastnight. Reconnected this a.m. all temps were the same started veh and walla no more codes. A... Trouble codes: P0711.
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