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Prev Professional Automotive Repair Technical Discussions for October 10, 2006
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Open Help Requests for GM
Help Request Answers
1998 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52K8W
hey all you gm techs out there. i need some help with this one. it had a new engine installed a year ago. it came back with mil on with codes po306 & p1133.found a bad plug wire and checked the o2's, graphed while driving, switched from .200-.800.cleared codes... Trouble codes: P0133, P1133
1998 Buick Century Custom 3.1L instrument dimming VIN: 2G4WS52M1W
Customer came in complaining of his panel dimming fuse to be blowing and the panel and trans. indicater lighting to be going out. Initial diagnoses found the headlight switcvh to be burned, so i replaced it and the fuse and it seemed to have cured the problem....
1999 Buick Century Custom 3.1L Hesitation, Cuts out VIN: 2G4WS52M0X
I inherted this one after it has been to 3 other shops. It cuts out like hitting rev limiter at 3000 rpm. I have scoped 24x, 7x, 3x, cam sensor, IC, and Injectors. The only thing I am seeing happen is when scoping injector amp draw the signal goes almost flat,...
2005 Buick LeSabre Custom 3.8L Starting VIN: 1G4HP52K45
Thanks for your help! This is a good customers 2005 LeSabre with a no crank condition. I purchased time on ACDelco TDS, but it only shows bulletins. I need a service manual scematic for this. I've got power into and out of the ignition switch including crank p...
1997 Cadillac Eldorado 4.6L oil pan VIN: 1G6EL12Y8V
We had just replaced the head gasket on this engine. Now the Lower crancase gasket leaks(Not the oil pan). The customer wants us to provide free labor for this since we didn't fix the car right(even though the 2 repairs are totally seperate of each other). My ...
1999 Cadillac DeVille d'Elegance 4.6L MIL Lamp on VIN: 1G6KE54Y0X
Car came into shop with multiple codes replaced Mass Air Flow and code P0101 continues to come back in system we have replaced mass air flow twice and computer with reprogram and have ck'd all wiring and grounds going to the sensor. Any Ideas would be greatly ... Trouble codes: P0101 (Mass Air Flow)
1978 Chevrolet mercruiser 180CID Poor Fuel Economy
Whew what a tough one! I know this is a boat and I'm trying to help a guy out. Mercruiser 140 4cyl. with a Rochester 2 GC carburetor. Finding a float level spec and method is out as even the dealers in this area don't have it. Or at least they wont tell me. Ch...
1989 Chevrolet Cavalier Z24 2.8L Excessive Emissions, Poor Idle Quality VIN: 1G1JF31W8K
hey guys Ive got an ugly one on my hands.This car came in for an emmission test,after it failed miserably the customer told us it had failed a number of times before and he had been trying to fix it for three months.I found the ecm loose in the glove box with ...
1993 Chevrolet K1500 Cheyenne 5.7L oil pressure VIN: 2GCEK19K2P
This is my personal vehicle. Oil pressure is consistent except under certain conditions. I first noticed it on the freeway. I was going about 80 and started up a long hill. The trans. kicked out of OD into 3rd (about 3500 rpm). I noticed after a few minutes th...
1994 Chevrolet K1500 5.7L valve train VIN: 2GCEK19K2R
Hi guys I have a truck here that is got me scratching my head.This truck has regular maintenance done all the time and is not an abused truck.When pulling hills the valve train starts to clatter and loses power,if you pull over and let it idle it slowly gets q...
1995 Chevrolet Lumina APV 3.8L vent valve VIN: IGNDU0612S
The ECM is setting code 1561 (c/c vent valve) every time cruise control system is set. Cruise control will not work. The cruise control imputs to ECM are ok ("on", "set" and "resume" signals from switch). Despite the vent valve solenoid resistance is ok I te...
1996 Chevrolet C1500 5.7L No Start VIN: 2GBEC19R1T
This truck was sent to me from a local shop. The truck died while going down the road. The customer pulled the truck home and started part swapping. He replaced the pcm without getting it flashed, the fuel pump, ckp sensor, the distributor, distributor cap, an... Trouble codes: P0336 (ckp a circuit performance), P0339 (ckp a circuit intermittent)
1997 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W1V
hello all this is my first post so here it goes. this blazer came in with a hard start hot or cold ( customer did drive it into the shop ). when we went out to pull it into the shop it started up normal. we did the other service work that was needed and after ...
2000 Chevrolet S10 4.3L Cuts out VIN: 1GCCT19W1Y
Well guys and gals heres one for you all. We have a 2000 blazer in the shop that shuts off while driving. Usually does not happen with the first start of the day. If you start it and drive 5 miles or 50 miles it runs fine. It happens when you shut it off and s...
2000 Chevrolet Cavalier LS 2.2L heatercore VIN: 1G1JF5244Y
Hello Techs.Cavalier came in for no mode door operation.Found blend door broken.On this model you need to remove heater box assembly to replace. No problem doing job went well,while their I also replaced evap core &heatercore.My problem is heatercore has noise...
2002 Chevrolet Venture LS 3.4L No Start VIN: 1GNDX03E42
We have this Venture that is a wheel chair accessible conversion. About once or twice a week after sitting overnight. It will not start. It has good cranking and good spark but, no fuel pressure. Sometimes there will be a code for fuel pump enable circuit. (th...
2000 GMC Yukon SLT 5.3L overheats VIN: 1GKEC13T4Y
Truck overheats slowly and gradually, idleing or driving. Came in for obvious leaking water pump, replaced it and thermostat, also fan clutch as was bad, flushed system and test...truck overheats slowly, gradually, idleing or driving. I have checked for coolan...
1996 Pontiac Firebird 3.8L Misfire, Poor Fuel Economy VIN: 10TU67O568
she oringally ran out of gas filled ran a few days then engine light came ,brought to me change fuel filter .tryed to clear code comes right back on it still misfires not anough to stall but can feel it doesnt have the power it had before,injector pulse is 3.7... Trouble codes: P300
2001 Pontiac Grand Prix GTP 3.8L Misfire VIN: 1G2WR52161
hey guys and gals this is my first posting so please bear with me.this car came to me with a defenet misfire on heavy accl. or load , runs fine at idle and normal accl. ltft-14.7 stft-1.6 maf readings appear normal misfire is random but more prevelent on 1 and... Trouble codes: P0300
2002 Pontiac Firebird Formula 5.7L No Start VIN: 2G2FV22G22
Hello guys, I have a mystery no start on this trans am just hopeing someone may have had similar experience.This car has been here twice, Customer states it will not start, after questioning I gather that there is no starter engagement when this happens. I hav...
2003 Pontiac Grand Prix GT 3.8L no power VIN: 1G2WP52K63
car came in with no power under load . scan and has no codes in computer. has no misfires but convertor is plugged up can not find way cat is plugged up car has no codes and no misfires but we don't want to sell her a cat and have a problem at a latter time an...
1996 Saturn SC2 1.9L Hesitation, stumbles VIN: 1G8ZH1279T
when veh, came in would not start, after correcting condition, found that customer complaint of "bogging down" was present, found that when in gear at aprox, 4% throttle will stumble and drop rpm from around 780 to 350-500 rpm, if throtle opened wider will smo...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick Park Avenue 3.8L Starting VIN: 1G4CW52KXW
Thanks for your help, we verified that we are dealing with an immobilizer issue. We had another key cut and initialized it and they are currently using the new key. I haven't heard back from them and hope that is good news.
1997 Cadillac Catera 3.0L Cooling Systems VIN: WO6VR542VR
Finally new instrument cluster came in, we install it & everything went okay. So the problem was the gauge itself.
2001 Cadillac Catera 3.0L sport track light .prndl lights VIN: W06VR54R21
Checked power and ground issues.None found.Checked connections at the switch OK.I did find that the HVAC drain is located above the trans range switch.Talked to customer .Wanted to replace the switch until he found out the cost.275.00 cost.He states he has a b...
1990 Chevrolet K2500 Cheyenne 5.7L electric system VIN: 1GCFK241LE
thanks for the help i found starter wire broken in wire loom from corrsoion thank again
1991 Chevrolet K1500 Cheyenne 4.3L TRANy-Tcase VIN: 1GCEK14Z8M
Thanks For the tips by each member. I pulled the frt drive shaft, then dropped the trany fluid, both were ok. There was in fact a rough bearing in the transfercase, which I replaced along with the chain. Upon reassembly and talking again with customer he indic...
1992 Chevrolet Astro 4.3L No Start, Stall VIN: 1GKM19Z1NB
Thank-you for all the help, the ignition module does fire the injectors seperate from the spark, and that probably fixed it, but somewhere in there it blew the ecm 1 fuse which I didn't notice until later so that made it difficult and is why it still wouldn't ...
1996 Chevrolet Tahoe LS 5.7L Break Pedel VIN: 1GNEK13R7T
I am currently satisfied with the breaking ability the Tahoe now has! However I am looking into a police package master cylinder of a newer vintage as the 96' is same as deisel version,also soon to be installed will be stainless steel break flexable lines, I d...
1997 Chevrolet Express 1500 5.7L Stall VIN: 1GBFG15R6V
Hi everyone thank you for the input it was simply a bad fuel pump put new pump on problem gone. Fuel pressure would be good then all of a sudden drop to 40psi and quit again thank all of you
1998 Chevrolet Venture LS 3.4L No Start VIN: 1GNDXQ3E1W
thks every body for trying to help...most of the replies refer to TPS failure...mmmmm...can be...the customer has no return for checking aga the car...we will focus on TPS next.I WILL post the result or the fix...but at this time we bbetter close the requiest....
1999 Chevrolet Blazer 4.3L Air Bag light VIN: 1GNDT13W3X
Thanks for the responses, but I was unable to fix this one with information I obtained so I referred on to the dealer. I did, however confirm that is was nothing related to the work we did by rechecking everything thoroughly. Thanks again.
2000 Chevrolet Silverado 1500 4.8L Internal Lubrication VIN: 2GCEC19V3Y
Well Boys and Girls, Looks like we may not get a chance to confirm a fix on this one. Customer is planning to get rid of the vehicle without fixing it. If that doesn't work out for him, he promised to bring it back. If he does, I will post an comment with th...
2002 Chevrolet S10 LS 4.3L Brake, Rear Turn VIN: 1GCDT13W22
OK guys I got it fixed. Turned out it had two problems and that is what was giving me such a hard time in finding it. I originally did some testing and came to the conclusion the multi-switch was bad. I got a new one and plugged it in without installing it to ...
2004 Chevrolet Impala 3.8L temperature actuator VIN: 2G1UH52K44
thanks for all the replies, Just as everyone was thinking and as I had assumed. The acuator was working intermitently, the customer decided to replace the acuator and will let me know if he has any more trouble.
2004 Chevrolet Silverado 1500 5.3L no communication VIN: 2GCEK19T64
as everyone told me, the cigarette lighter fuse powers the aldl connector, and when i finally located this fuse & replaced it, the abs light went off, and all my problems went away. i guess somehow the abs system uses this circuit and turned on the alert becau...
2005 Chevrolet Equinox LT 3.4L front wheels VIN: 2CNDL73F65
I checked this on the lift , tires spinning, in gear and could not duplicate the noise. Justin mentioned something about a possible center support bearing. Manuel said he had just run into this exact same problem on the exact same type veh same model year. He ...
2001 GMC Yukon SLE 5.3L Misfire, lack of power VIN: 1GKEK13T61
Thank you every one the fix for the vehicle was replacing the catalytic converters one of the two had 5 lbs back pressure @ 2500 rpm , the missfire was one bank lean and one bank rich the vehicle didnot know what to do.Thanks again for all your help & feedback...
1999 Oldsmobile Aurora 4.0L Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G3GR62C5X
thanks everyone. we replaced the two crank sensors and we have had no more problems. thanks again. Trouble codes: P0300 (miss fire), P0603 (control module lt mem reset), P1599 (engine stall or near stall).
1995 Pontiac Bonneville SSE 3.8L MIL Lamp on VIN: 1G2HZ5215S
We were told to check resistance on all three solenoids involved, and the first couple of times all was well. After warming up and an extended drive one time, the boost control solenoid was open. Recommended boost control solenoid to customer and he declined a... Trouble codes: P1640 (quad drive 1 circuit).
1996 Pontiac Grand Am SE 2.4L catalyst monitor VIN: 1G2NE12T3T
Thanks to all who helped with this gremlin!!!. It has finally run and passed the cat monitor. The cat was so borderline that the computer just wouldnt confirm or deny the monitor.After replacing the cat and driving it less than 10 miles , all was well. This is... Trouble codes: P0420, P0172, P0325, P0139.
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