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Prev Professional Automotive Repair Technical Discussions for December 19, 2007
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Open Help Requests for GM
Help Request Answers
1997 Chevrolet Blazer 4.3L heater core VIN: 1GNDT13W3V
This vehicle is from another shop that I am fighting with. The temp. out of the vents is a paltry 57 degrees. Both heater hoses are about 180. I pulled the bottom of the box open to reveal the heater core and can touch it with my hand. Reytek temp gun shows re...
1997 Chevrolet Astro 4.3L Misfire VIN: 1GNDM19WXV
Related repair history was first repair then symptoms occurred. Customer states rough running while on 90 mile trip, cel on, loss of speed. Scanned and found Cylinder #5 & 6 misfires at speeds baove 55mph after 20 miles of driving. CEL on codes P0300 and P0305...
2000 Chevrolet Silverado 1500 4.3L timing cover VIN: 1GCEC14W0Y
a new engine was installed in the vehicle---all parts transferred over---when started up the timing cover was leaking oil from the lower part of the cover (next to crank sensor) and the oil pan. the crank sensor and the o ring was replaced. all gaskets and tim...
2000 Chevrolet Express 3500 5.7L Axle bearing VIN: 1GCHG39R52
This post is not necessarily for a vehicle fix but a customer relation issue. This van originally came in for a major shake in the rear when braking. We found that the parking brake cables were siezed on & the shoes were cracked from overheating. While my tech...
2001 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHC291X1
Customer has this vehicle which after sitting for at least 4 days will not start until cust primes fuel filter. customer has taken vehicle to dealer and they cant seem to duplicate. I've worked on 6.5 and 6.2 gm diesel and suspect fuel is draining back. but I'...
2001 Chevrolet S10 2.2L no power on accel VIN: 1GCCS14591
plugs look clean, front o2 slightly white, rear o2 dark opening up throttle and vacuum never recovers, timing seems to be close Trouble codes: 172 (rich)
2001 Chevrolet Malibu 3.1L Misfire, MIL Lamp on VIN: 1G1ND52J81
Got a strange one here guys-on decel this Malibu will show misfires on all cylinders.You would never know there was a problem but it keeps on tripping the MIL.Fuel trim numbers look good as well as all other data so we went ahead and tuned it up but it didnt c... Trouble codes: P0300 (Random misfire)
2002 Chevrolet Impala LS 3.8L hradlamps VIN: 2G1WH55K12
i have 02 chevy impala the head lights , tail lights ,interior dome light , dash lights. all turn on and off momentarily (flicker) after driving 10-15 min.when this problem occurs you can hear a click from relay under l\side of dash,now this only occurs when h...
2002 Chevrolet Tracker 2.0L heat VIN: 2CNBJ13C22
hi all... we are all a lil stumped on this one customer had her car towed in for an "extreme" over heating issue. after pulling it in and getting it to operateing temp i called the customer and tried to varify what was going on and she said the reason she had ...
2003 Chevrolet Silverado 3500 6.0L No Start, Cuts out, Stall VIN: 1GCJK33UX3
Help all techs.I'm a GM fuel/electrical guy that's running out of ideas.Sorry about size of text.Thanks in advance.I've got this logging company field repair truck with a intermittent quits/cuts out.Fuel pressure is always steady @ 58 psi when stalls.Feels lik... Trouble codes: P0336 (crank sensor performance error)
2004 Chevrolet Trailblazer LS 4.2L No/limited four wheel drive VIN: 1GNDT13504
Hi all, thanks in advance. I've got a 2004 Chevy trailblazer in over the weekend. Customer complaint was of no 4 wheel drive, I took out for test drive and find it's not working quit right. All seems to work correctly, light for appropriate gear lights up when...
2005 Chevrolet Silverado 1500 SS 6.0L direct drum VIN: 1GTEC14X85
this is a race truck with a turbo 400 with a fully manual valve body. my question is has any one used a 4L80E direct drum in a thm400 trans.It looks like it would work.Any input would be appriciated.
2005 Chevrolet Silverado 2500 HD 6.6L reverse VIN: 1GCHK23255
HELO, this silverado has what I think is a electronic problem, Every morningwhen I start the truck, It has no reverse till I run the shifter back and forth a few times, and sometimes rev the engine, then reverse will engage, but the I/P displays range inhibito...
2005 Chevrolet Aveo LS 1.6L no start VIN: KL1TD52645
tow to me,, boyfriend installed battery, reversed pole.. has no spark,, noid, or fuel pump.. powers to ecm ok,, grounds to ecm ok... HAS NO SES LIGHT WITH KOEO,, but has dim SES light while cranking.. replaced ecm.. no change... dose not have theft deturent mo...
2000 GMC K2500 Sierra SLT 5.7L No Start, no module comm VIN: 1GTGK29R4Y
Intermittant crank no start, No communication using tech 2 Any Ideas,common things to look for?
1999 Oldsmobile Alero GL 3.4L Traction Control VIN: 1G3NL52E4X
This is from a used car lot & came in with the abs light on Replaced the motor pack because it was not working & now when i take it out & drive it the low trac light comes on & then goes off & i know it is not losing traction Also there are no codes being set ...
1992 Pontiac Grand Prix SE 3.1L dome lights VIN: 1G2WJ14T0N
thanks for the help,I'm having trouble diagnosing dome lights that stay on,when they are working normally the dome lights dime slowly and then go out like they are controlled by a lighting module but my wiring diagram does not show a lighting control module in...
2001 Pontiac Grand Am SE 3.4L Brake Pedal VIN: 1G2NF52E71
Hey guys, I have a vehicle with a hard brake pedal, only on first brake application and it only happens every once in a while. The pedal is rock hard and the vehicle will not stop. I have only experenced the condition once, release the pedal and apply, the con...
2002 Pontiac Sunfire GT 2.2L engine VIN: 1G2JD12F22
Hello fellow techs, We have a customer who decided 10k mile intervals for oil changes was ok and now he has an intake cam siezed and bent valves, ect. We have the ok to put in a jasper.What is the best way to do the r&r? It looks pretty tight comming out the t...
2002 Pontiac Grand Am GT 3.4L No Start, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1G2NW52E92
vehicle runs fine until warmed upand whenyou accel it starts to cut and continuously gets worse until the car won't even start. if you let if cool off then it will startand run again until warm, and so on and so forth
2003 Pontiac Aztek 3.4L abs VIN: 3G7DB03E83
car came in a couple weeks ago for abs light and awd disable light on. c0051 r/r range performance. she had taken car to another shop where she works(180 miles away)and they relaced r/r hub. i scoped both rears unplugged at the sensor and they were the same. c...
1999 Saturn SL2 1.9L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G8ZK5272X
1999 saturn dohc.stalls when i step on gas pedal slightly stalls.once takes off car drives traffic light step on gas pedal cuts out,stalls again.replace plugs,wires,coils,ignition module and crack sensor i still have p1599 code coming up.i have no idea... Trouble codes: P0341, P0304, P1599 (stall detected), P1624

Fixes & Summaries for GM
Fix/Summary Answers
1995 Cadillac Fleetwood 5.7L traction VIN: 1G6DW52PXS
Well, thanks to all who replied. I pulled the control module from the ABS unit to check the interior circuitry for anything out of the ordinary. All of my connections looked great inside without corrosion or problems. I put everything back together and "voi...
1993 Chevrolet K1500 Cheyenne 5.0L Poor Fuel Economy, Lack of Power VIN: 2GCEK19H6P
Nobody addressed the original problem of the knock retard reading 20 degrees not running and 26 degrees running. As far as advancing the inital timing of course that is going to help but it does not fix the problem at hand. We still have not found the problem ...
1993 Chevrolet Lumina 3.1L No Start VIN: 2G1WH56T2P
Igntion module was the problem. Disconnected crank sensor at igntion module and lost spark which confirmed crank sensor was good. This design uses the ignition module to generate signal to pcm to fire injectors. The scratch test on that signal wire was a good ...
1999 Chevrolet Astro 4.3L rear differential
Hello all, thank you for your time. I did get a mixed bag of replies. I felt from the onset that using the posi would be ok but had that shadow of doubt. I decided to go ahead and install it. I did add posi additive and also used GM gear oil. It is working wel...
2001 Chevrolet Silverado 1500 5.3L ABS Control Module VIN: 1GCEK19T41
OK . . .its fixed. Turned out that the last updated part number we had been putting in DOES NOT WORK in this vehicle - total of THREE [...] control modules installed (TO NO AVAIL). 2 were from a "bad batch" and the other one from a different batch - suspect...
2003 Chevrolet Express 2500 4.3L No Start VIN: 1GCFG25X13
Thanks to everyone for your help.I got a AC Delco cap for the van. I put it on and It started right up. So I got one for the truck and it fixed it to. Thanks again to everyone. Trouble codes: P1626.
2006 Chevrolet Silverado 1500 LT 5.3L Power acces VIN: 1GCEK19Z16
I'm afraid the fire was self inflicted according to the C&O people. It appears the door pocket had debris stored and a "cigar" was found there ---well whi\o knows
1998 Oldsmobile Bravada 4.3L temp blend door VIN: 1GHDT13W4W
Many thanks to all who replied. The problem was the actuator. I took special care to install all the fasteners in the original locations. Again thank you to all and have a great holiday.
1998 Pontiac Firebird Firehawk 5.7L Poor Idle Quality, MIL Lamp on VIN: 2G2FV22G0W
Thanks guys for the help. The problem was intake gaskets. Sorry about the lack of info one of the techs here got the car hot befor I could get all of the numbers. Once it got hot it ran just fine. Anyway the intake gaskets would suck air until they heated up a... Trouble codes: P0108.
2000 Pontiac Montana 3.4L Poor Idle Quality, Cuts out, Stall VIN: 1GMDXO3EOY
it turned out the nuetral safty switch was not matching the range switch replaced it and very things good know
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