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Prev Professional Automotive Repair Technical Discussions for June 29, 2009
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Open Help Requests for GM
Help Request Answers
1994 Buick Century Custom 3.1L No Start, Stall VIN: 1G4AH55MXR
car came in on the hook. no fuel at the rail & power at the pump while cranking. so installed new pump, got fuel to the rail now but only 15 psi. blowed thru all lines and all are open, new filter. so thought i got a bad pump 2 pumps later still can't get any ...
1995 Buick LeSabre Limited 3.8L Electronic VIN: 1G4HR52L9S
Hi everyone have one that cant make sense of have interment a/c clutch I have voltage from hvac to pcm but pcm will turn clutch on & off have tried two different pcm"s. no codes in a/c or pcm can,t see any problems with data on sensor. any ideas? thanks randy
2006 Buick Rendezvous CX 3.5L Surge, Low Power VIN: 3G5DO3L76S
HELP! I have a Rendezvoux giving me quite a headache. Problem is intermittent... Only happens with hot engine, usually after driving 10 miles or more. Scanner indicates normal timing advance when engine is running good (50mph, 50% throttle = 25 degrees timing)...
1995 Chevrolet Blazer 4.3L compressor VIN: 1GNCS13W6S
hope you can help ,thanks in advance. well we replaced the oe unit because of noise that over got progressivly worst over time.replaced with new unit from DELPHI, flushed system ,replaced orifice tube ,and dryer ,everthing worked out well until couple months l...
1999 Chevrolet Cavalier 2.2L No Start VIN: 3G1JC5247X
It's been a long time since I've posted a help request, I hope I get this right. I've got a 99 Cavalier with a factory installed Natural Gas system. I was a GM tech for 17 years and never even knew they had one. I am now working in an independent shop and have...
2001 Chevrolet Impala 3.4L MIL Lamp on VIN: 2G1WF52E61
This is a new customer in for a inspection, The mil light was on. I scanned the car and it was PO420. The cat efficency. The customer stated that the light had been on for about 6 months. He said another shop had replaced the intake manifold gasket and radiato... Trouble codes: P0420
2003 Chevrolet Cavalier 2.2L Mechanical VIN: 1G1JC12F53
We have one that is driving us nuts! Towed in for a no start in March, no fuel pressure, replaced the pump. No start at times again early June, good fuel pressure, replaced crank sensor, all was well. Back 2 weeks later same issue, crank, no start, has fuel pr...
2003 Chevrolet Impala 3.8L No Start, Stall VIN: 2GIWH52KX3
This is a strange one.This Impala(my daughters's car)stalled after about twenty feet and would not restart. When I got to the car ,it would crank, fire and shut right off.Actually it was acting like a first generation passlock system problem or a standard tran...
2004 Chevrolet Suburban 1500 LS 5.3L Cuts out, Stall VIN: 3GNFK16Z44
Please help! I have this '04 Chev. Suburban, 5.3l "Z" engine with a problem that shows up intermittently. After driving at least 20-30 min., the car hesitates and lugs on acceleration, and will eventually stall. With a fuel pressure gage hooked up, when the pr... Trouble codes: P0171 (Lean bnk 1), P0174 (Lean bnk 2)
1992 GMC C1500 Sierra 5.7L Hesitation, Cuts out, Stall VIN: 1GTEC14K1N
Thanks in adv ance for all your help. After used engine installation,this truck will stall at idle. Fuel pressure at idle is 15 psi, LTFT 110, STFT128. After fuel return line is pinched truck runs great and fuel pressure jumps to 20 psi. Map sensor readings at...
2002 GMC Envoy SLE 4.2L fan clutch VIN: 1GKDT13S12
cust complained about intermit. check engine light and the fan was making alot of noise. checked codes with genisys, p1484 cooling system fan performance in history, none in current codes. relaced electric fan clutch. cust returned with check engine light on, ...
2005 GMC Canyon Z71 SL 3.5L ABS light on VIN: 1G1CS19665
Good day people. I have this 05 Canyon that is turning on the ABS light with a code C0035 left front wheel speed sensor circuit or front sensor supply voltage circuit. This code is intermittent. The light has never come on while I'm driving. Both front wheel s...
1997 Oldsmobile Aurora 4.0L Hesitation
The car has a loss of power in drive about 2500 rpm lite throttle. If you punch it, it will go but lacks some power. A friend of mine has this car at his shop. I only had a snap on brick to check scan data. LT fuel trims b1 -6 b2 -10 at idle, b1 3 b2 4 at crui...
2001 Pontiac Grand Prix SE 3.8L Power Steering Pump VIN: 1G2WR52171
This Vehicle came in with a pressure hose leak and a power steering pump making the typical graoning noise. Customer requested replacement of the pump and the hose. We did so leak fixed noise still there. We have flushed the system and replaced the pump 2 more...
2001 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 12WER456YU
Hello, all you GM Techs,i have a problem child here. I have a reading of 1.45 volts at the fuel pressure sensor pid. I have smoked vehicle and came up with no leaks,snap-on machine ran test and says it is holding vacuum.i have vacuum at canister all the time a... Trouble codes: P0452, P0440
2000 Saturn LS1 2.2L cam VIN: 1G8JU52F9Y
i have a 2000 saturn ls1 2.2 echo tech i just got an engine for a 2006 cobalt with 40k on it and will be installing it into this car. the one concern is that the cobalts have electric power steering and my L has mechanical, i know i need to change the intake c...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Buick Rainier CXL 4.2L unknown
Changed transfer case fluid twice. I released the vehicle back to the owner last week and checked back in with them today and they are fully satisfied that the noise and jerk are gone. Thanks to all that helped.
1994 Chevrolet C2500 5.7L Poor Idle Quality, MIL Lamp on VIN: 1GCEC29KXR
Thanks for all the help found tcc drawing to much current not letting EGR circuit work. Thanks again for all the help Trouble codes: 32 (EGR Circuit error).
1995 Chevrolet p-30 5.7L preignition / knock VIN: 1GBJP32K1S
thanks for all the replies , the problem was in the head gasket .num 3 and 5 cylinders ,, compression leaking from one cyl to another, compression was low on these two and when diassembled found small crack in gasket,,replaced gasket assemblied engine all is f...
2003 Chevrolet Suburban 1500 LS 5.3L No Start VIN: 3GNFK16Z63
Hello again and thanks for all your help! I did a few more test to pin-point the fuel pump and found a bad pump. Volume test was out of spec. and pinch test confirmed the pump. Replaced the pump and vehcile ran great with no fuel pressure loss. Thanks again fo... Trouble codes: P0430 (cat. efficiency below threshold).
2004 Chevrolet Suburban 1500 LS 5.3L temp. blend motors VIN: 3GNEC16Z54
This is a great sight. Thank's to everybody that sent replys. I checked all of the connectors that were suggested for pushed out pins,or loose corroded pins and all was good. next, I cleared the codes and recalibrated the control head and ran system until it f...
2007 Chevrolet Cobalt LT 2.2L Lighting VIN: 1G1AL55F17
first all thanks to all replied we checked wire from head light switch to bcm and bcm to power distribution box and could hear relay click but no park lights so order new box and fixed lights and dash lights all is well now woo woo! relay was fixed to circuit ...
2001 GMC Yukon XL 1500 SLT 5.3L No Start, NO COMMUNICATION VIN: 3GKEC16T61
Fixed found water had gotten inside of PCM connector number 1 and corroded connector and pcm connections. Cleaned up put back together and everything worked fine. Noticed vehicle is two wheel drive and doesnt have all splash shields four wheel does. Possibl...
2004 GMC Envoy SLE 4.2L All gauges VIN: 1GKDT13554
Thanks to all for help. Sent unit back to company who fixed and programed cluster. No info given about what was wrong but is fixed now.
1989 Oldsmobile Cutlass Ciera 2.8L No Start, Poor Idle Quality VIN: 2G3AJ51W1K
Thanks to all, Problem was bad injectors.When I checked ohms on both banks they were the same.Instead of thinging there may be a bad injector on each bank I just asumed all to be ok. Jim
1994 Pontiac Firebird 5.7L No Start
Well, IATN wants me to close this one out by the 4th, and it's going to be after that when I look at the vehicle again. Probably going to double check most of the things you guys mentioned and also the stuff I went over, as I think everything that it could pos...
2000 Saturn LS2 3.0L MIL Lamp on VIN: 1G8JW52R4Y
Sorry, I have not been able to get more information for you as of yet. I got two responses for possible MAF, when we checked it, it seemed ok, as I said this was intermittent. If we could consistantly cause this to fail, it would be easy. As far as the tune up...
2006 Saturn Vue 3.5L steering wheel VIN: 5GZCZ63476
Two people hit on the head! Measure the rotors cold and they are within spec. Measure the rotors when hot and they are right at the limit! Replaced the rotors and drums and the customer has not returned for a week, so I'm calling it a fix. Rotors were still wi...
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