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Prev Professional Automotive Repair Technical Discussions for April 4, 2007
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Open Help Requests for GM
Help Request Answers
1995 Buick LeSabre Limited 3.8L Surge VIN: 1G4HR52L7S
g.m help please. this 1995 lesabre will gradually raise the idle speed until it gets to 3,000 rpm.no codes, the problem seems to start when the a/c is turned on. the idle starts to climb as compressor cycles.the computer is opening the iac all the way to 145 c...
1996 Cadillac Seville SLS 4.6L overheating VIN: 1GC45RT874
have this caddy i think is possable head gaskets, will run for 3min than temp gauge will go to red (overheat) new thermostat@ coolent sensor' coolent will start to boil over cooling fans come on low speed then high speed both rad hoses are cool, to me it feels...
1972 Chevrolet chevelle 350CID Mechanical VIN: 1G4K53GHTY
hi trans guys. just a question on this t 400 if i could please.i had a trans guy (which i'm not) as you'll soon see.it's my own trans had it completely gone thru about 1 yr ago by a trans guy.it worked fine.i used it in my chevelle for app 6-8 months .i took i...
1996 Chevrolet Cavalier Z24 2.4L Misfire, MIL Lamp on VIN: 1G1JF12T1T
hello all i have a 1996 cavalier z24 2.4 quad that is driving me crazy car will run great sometimes for hours or days then out of the blue starts misfiring backfiring pooring black smoke then next time you start engine it may run fine or not. ckp \cmp signal o... Trouble codes: P0171 (lean bank 1), P0300 (misfire)
1997 Chevrolet Blazer 4.3L air bag VIN: 1GNDT13W0V
i've got this 1997 chevy T blazer that has a air bag trouble code b1042 loop energy reserve voltage low(sir 42 current )alldata trouble tree lead me to replace the arming sensor under the driver's seat area (next to fuel filter area )cleared code's still have ...
1999 Chevrolet Express 3500 5.7L Excessive Emissions, Misfire, MIL Lamp on VIN: 1GCHG35R9X
engine missing on right bank only, you can feel and watch misfire counter on cylinders 2,4,6,&8. oxygen sensor repalced bank 2 sensor 1. the vehicle as it warms up starts to blow black smoke (over fueling) and missing on the right bank. we have removed the upp... Trouble codes: P0151 (o2 sensor circuit low voltage), P0174 (system too lean)
2000 Chevrolet Express 3500 5.7L Hesitation, Cuts out, Stall, EXTENDED CRANK VIN: 1GBHG31R2Y
Good morning to all.I have this 00 box van that I have narrowed a drivability problem down to being fuel related.Vehicle starts hard (excessive crank) hot or cold.when driving and more than 1/4 throttle is given van falls flat on its face,bogs down and eventua...
2000 Chevrolet Cavalier 2.2L starter
dear fellow techs iam in the house of pain .i have istalled two new neutral switchs and still have the same problem.the car will sometimes start in park sometimes you have to move the shifter to reverse.when no start occurs i have 12v at yellow wire on the neu...
2002 Chevrolet Venture LS 3.4L windshield wipers VIN: 1GNDX03E52
I have a 2002 chevy venture van. When I reseved it the wipers would not park, all other modes work fine. I found park stop on the transmission was worn down and the parking tab would not make contact so replaced the transmission and crank arm. Fixed right not!...
2002 Chevrolet Silverado 2500 6.0L gas tank sucked in VIN: 1GCHK24U62
This truck came in, for a no start. Found fuel pump dead, no biggie. Upon removal found the fuel tank sucked in. I know there is a relocation kit available for the vent solenoid, but should I also replace the tank and the charcoal canister like my dealer is su...
2003 Chevrolet Express 2500 4.8L Stall VIN: 1GCGG25V43
Hello GM techs i have a van here that shows a code PO507. the van idles low when warmed up & stalls out when first started up when cold, i have replaced the throttle body which comes with a iac & tps on it, i have smoked out the intake & see no leaks HELP!!! ... Trouble codes: P0507
2001 Geo METRO 1.3L Mechanical VIN: 2C1MR52221
This one got me pulling my hair out. A body shop bought this thing with a bad motor they installed A used motor an it run about 40 miles & started running real bad so they swapped it with another used engine. din't run but a mile swap it out for another used e...
2001 GMC Yukon Denali 6.0L planetary VIN: 1GKEK63U21
hi,i already have this unit out and on the bench. planet is destroyed. the question i have for you out there is that the planet's now seem to be stamped cages that seem to be welded as opposed to the cast version in earlier versions. has this been a problem wi...
2002 GMC Sonoma SLS 4.3L Hesitation, Cuts out VIN: 1GTDT13W22
Engine 'suddenly' acquired the symptom of almost totally cutting out under 45% load. When pedal is moved past about 50% (even in neutral) engine dies from lack of fuel. (If Gumout is used to enrichen the intake air the engine instantly resumes speed). Runs per...
1998 Oldsmobile Intrigue 3.8L code po040 VIN: 1U3ABR124W
Could use some help from the gm guys here.The car came in with a P0040 code and I found a dead R/F wheel sensor.I changed that and the front pads and rotors also(they were shot) but now the Poo40 code comes back on only on sharp turns.By looking at the scanner...
1994 Pontiac Firebird Formula 5.7L parking brake VIN: 2G2FV22P1R
Vehicle was towed to shop with right rear spring perch rotted off of axle tube.We replace rear end assembley with used unit from junk yard.Put new calipers rotors and brake lines in during repair.Vehicle was towed home unregistered.A month later customer regis...
2001 Saturn LW200 2.2L wipers VIN: 1G8JU84F41
we are looking at the body module conns and wiring right now. wipers still parking wrong [1/2 way up the travel]. any specific tests you guys know of? is this a pattern failure?

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick LeSabre Limited 3.8L Misfire VIN: 1G4HR52K9W
I would like to thank you guys for taking the time to replies.Based on what was sent I was able to narrow it down to the a valve train problem,though I was not able to check for sure. Trouble codes: P0300 (testing and results).
2002 Buick Rendezvous CX 3.4L RPM jumps up going down the road VIN: 3G5DA03E02
Thank you for your help, I found 3 wires rubbed through under the air filter box.The dark blue trans range B wire was open,repaired wires and rerouted wire harness.
1993 Cadillac DeVille 4.9L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6KD54Y03
Well, I surrendered! Actually, I suspected something internal and because I was not comfortable tearing into a Northstar engine and the customer had an extended warranty I sent it to the dealer. They went through all the same tests I did and where also stumped... Trouble codes: P0300 (Random Misfire), P0385 (CKP Sensor B).
1991 Chevrolet R1500 Suburban Silverado 5.7L speedometer VIN: 1GNER16K8M
Thanks to all who replied. After getting help from a local Chevy dealership, we found that the gears for the speed sensor and the output shaft were wrong. The trans had been replaced with a used one several years ago. After installing the right gears, the spee...
1994 Chevrolet Corsica 3.1L No Start, Cuts out, MIL Lamp on VIN: 1G1LD55M5R
thanks for reply me Im looking for the basics as paul said and probably timming chain is jumped Im not sure yet. thanks Troy [...] cannot see R.P.M. with my snap-on mt 2500 because the PCM no communicate to my scaanner, I forget to tell you when I jump the ALDL ...
1998 Chevrolet Venture 3.4L Poor Idle Quality, Stall VIN: 1GNDX03E1W
Thanks to all replies. Well after driving van for 1 day got to do it,and after exhuasting resources was idlw w/scanner hoked up after running for 1/2 hour noticed when I put foot on brake slight roll of idle,went to 02 sensor and watched 02 go lean after pla...
1998 Chevrolet Blazer 4.3L air distribution VIN: 1GNDT13W4W
i found that the linkage was loose from the mode door on the inside of the case.customer declined repair.thanks for all your help.
1999 Chevrolet Malibu 3.1L Misfire
sorry took so ling to reply ...had to put this one on the back burner for a bit ..problem was a bad lifter...as was mentioned by some of you ...thanks for all your help Trouble codes: P0303.
2000 Chevrolet Astro 4.3L AWD system VIN: 1GNEL19WXY
On the advice of a local GM dealer as well as a lot of you guys, I changed the transfer case fluid with the GM auto-trac fluid. This seems to have cured the problem. Thanks for your help!
2001 Chevrolet Cavalier 2.2L Reat Brakes VIN: 3G2JB52481
Thanks to everyone who replied. Everyone seemed to be on the same page as far as possible causes, from mis-matched or price challenged shoes to sticking wheel cylinders, a couple offered worn backing plates or a hydralic issue in the ABS or Master area, but I ...
2003 Chevrolet Suburban 1500 LS 5.3L instrument cluster VIN: 3GNFK16ZX3
Good morning, techs. It's going to be a good day. Yesterday I had spent some time looking for a wiring problem without any success. I was having trouble identifying the proper wire on the bottom of the fuse panel. The fuse is located in the middle of the panel...
2003 Chevrolet Express 1500 4.3L charging lite VIN: 1GCFG15X83
thanks bill from texas the voltage regultor in the alt was wrong causing code po 1637. also causing battery lite to flicker. thanks agin dale
2001 GMC Savana 3500 5.7L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1GTHG39R41
Yes it is fixed! Problem being a stuck & subsequent bent valve in cylinder #6. The main thing learned here is don't trust that missfire monitor. 5 & 7 were the only cylinders showing many missfire counts, none from other cylinders. Having a completely open int... Trouble codes: P0300 (random misfire).
1997 Pontiac Bonneville SE 3.8L Accessories VIN: 1G2HX52K4V
Hey all!!! I knew you would give me the right info!! As always!!! I waited til radio shack opened at 9 am and went and bought the 1.5k and a 330 ohm. Soldered them together and then put them in the place of the lock cylinder wires at the bulk connector. Starte...
1999 Pontiac Grand Am SE 2.4L Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 1G2NE52T2X
Thanks for all of your replies. This vehicle needed a pcm, when it went into power enrich mode the injector driver for #1 would not work, we sent it to the dealership for pcm replacement. also the plugs that were in it were 1/4' shorter than the recomended plu... Trouble codes: P1171.
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