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Prev Professional Automotive Repair Technical Discussions for June 18, 2009
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Open Help Requests for GM
Help Request Answers
2001 Buick LeSabre Custom 3.8L drp system VIN: 1G4HP54KX1
This car came in with a problem of pulsation or shutter when applying the brakes at highway speeds. After driving the car we found that the ABS system is starting up on both rear wheels only when you apply light brake pedal pressure at highway speeds only. We ...
1998 Cadillac DeVille 4.6L MIL Lamp on, P0452 VIN: 1G6KD54Y8W
Car came in as no start. Replaced fuel pump with GM part. Had no codes before replacing it. Now code P0452 sets VERY quickly everytime. Smoke tested system. It shows no smoke NOR any flow from the smoke machine, the ball settles at zero flow with no fluctuat... Trouble codes: P0452 (fuel tank pressure sensor signal low)
2000 Cadillac Escalade 5.7L radio VIN: 1GYEK63R5Y
radio will not turn off causing battery to drain overnight. All fuses are ok. There are no dome lights either. HAs anyone ran across this? Thanks for your help
1994 Chevrolet Camaro 5.7L compressor VIN: 1G4P14C123
Okay Guys sorry for the vin but at home forgot to bring it with me. How in the heck do you get this compressor out? I have the three bolts in front out but can't seem to find a way to get to the bracket in the back to get the 2 ten mm bolts out and the hoses o...
1996 Chevrolet C1500 Suburban 5.7L pressures VIN: 3GNEC16R3T
hello i have a 1996 c1500 suburban in for warm air.compressor had came apart so i replaced comp cond acc o-tube rear evap rear txv & high side line to rear.flushed hs line from cond that y's off (front & rear). added 2 oz of oil to comp, 2.5oz to accumulator &...
1996 Chevrolet K2500 5.7L Hesitation VIN: 1GTGK24R8T
Truck will hesitate on accel. Will have to ease off on pedal to stop it from cutting out. Has new ign. parts (ngk plugs and wires). Fuel pressue 53 psi running and 60 psi KOEO. Scoped fuel pump 5300 rpm with less than 100 rpm varation. Scoped ign. 14 kv max. S...
1997 Chevrolet Blazer 4.3L Unknown VIN: 1GNDT13W3V
This blazer will start off in 3rd gear when accelerating, also when this happens you cannot turn the ignition key back to remove key?? I have checked wiring with no problems found, Check engine lite is on but it's all trans codes from I'm assuming no voltage a...
1997 Chevrolet Lumina 3.1L Hesitation VIN: 1GIND52M8V
ouch this one is driving me nuts. narrowed hesitation down to egr. during light accel in drive egr is commanded 99% and actuall egr position is 99%. intalled donor egr just because and no change hesitation still preset. this is screwing up this cars performan...
1997 Chevrolet Tahoe LS 5.7L distributor gear VIN: 1GNEK13R5V
Hello all and thanks in advance for your help. I had a coolant leak on this engine at the manifold, so I pulled the manifold and the distributor while I was doing it. When I pulled the distributor, I found quite a bit of wear at the drive gear on the distribut...
1999 Chevrolet K1500 Suburban 5.7L Hesitation VIN: 1BNFK16R8X
no misfire counter. even if i induce a misfire. it has a hesitation on mod to heavey accleration. it fells like its running short on gas. o2 sensor readings are in the 800 to 900 hundreds. maf grams around 190.it will not act up by power braking in shop. ive t...
1999 Chevrolet Silverado 1500 5.3L Transfer Case VIN: 2GCEK19T5X
Quick question (hopefully); Truck came to me from an amatuer mechanic of decent skill. States truck is stuck in 4WD all the time. Has tried an encoder motor, no change. Currently has the front drive shaft removed. Believes the transfercase is bad. I decide...
1999 Chevrolet K1500 Suburban 5.7L Poor Idle Quality, Misfire VIN: 1GNEK13R13
have a problem mil p0300.i checked misfire data ,cyl#4 a lot of multiple misfires.have a misfire on cyl#4 and runs rough at idle,above 1,500 rpm runs smooth and no cyl#4 misfire detected on scan tool.i had replaced the intake gasket,injector#4,cap,rotor,wires,... Trouble codes: P0300
2002 Chevrolet Corvette 5.7L odometer VIN: 1G1YY32G12
Hello all, This Vette was working fine when the odometer dropped off to 889 miles. The fuel gauge was stuck on empty but when I cleared out the history codes the fuel gauge started working properly. Although with the scanner connected the fuel level still read...
2004 Chevrolet Classic 2.2L Poor Idle Quality, Hesitation VIN: 1G1ND52F74
I think this ecotec has jumped time. It idles a little rough and has sluggish acceleration. No codes at all. Fuel trims are normal at idle and go way negative under load (o2's pegged rich) Thought it was classic signs of a clogged cat but backpressure seems no...
2005 Chevrolet Silverado 3500 6.6L MIL Lamp on VIN: 1GCHK33215
engine losses power and goes into limp mode. There is a tsb for replacing the injector connector on cyl. #2 and #7. I have also heard of some harness chaffing. I normally don't work on diesels, any help would be great. Thanks Trouble codes: 207 (injector 7 control circuit), 2146 (injector pos. voltage control circuit group 1)
1997 GMC K2500 Suburban SLE 7.4L No Start VIN: 3GKGK26J6V
Hello Group, This suburban came to us 10,000 miles ago as a tow in no fuel pressure. Diagnosed as bad fuel pump we removed the tank and found the electrical from the pump to the connector on the inside part of the sending unit assembly to be burnt. This vehic...
1999 GMC Safari SL 4.3L Steering Box, Pump VIN: 1GKDM19W2X
Greetings All! More strangeness. This van came in for complaint of fluid leak. Found the steering box leaking and replaced it. After 'bout a month or so, came back complaining of noise. Now this isn't the standard light groan/hiss that is normal. This noise is...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Riviera 3.8L Poor Idle Quality, Surge, Misfire, MIL Lamp on
This is my personal car , close to crushing it, with the mass air meter disconnected the car runs OK after three MAF meters still not fixed. Mass air Hz drops to zero engine stumbles might just put tape on SES light Trouble codes: P0102, P0122.
2003 Buick Century Custom 3.1L Misfire, MIL Lamp on VIN: 2G4WS52J13
Thanks for all the replies. Sorry it took me so so long to get back, but just got the car back in yesterday. Replaced the plugs and wires and checked the coils and ICM. Drove the car twice for a long time and it ran fine. It sat for 2 hours and I drove it ar... Trouble codes: P0336 (Crank Sensor).
2005 Cadillac Escalade 5.3L Poor Idle Quality VIN: 1GYEC63N25
1984 Chevrolet MOTORHOME 7.4L charging system VIN: 1GDJP37W2E
a special thanks to all that replied bob [...] pointed me to the co. that bought LESTEK MANUFACTURING. i contacted them via internet www.penntexusa.com they have a distributor in cinn, oh. (ups) voltage regulator and still no charge. contacted the place i bo...
1999 Chevrolet K1500 Suburban 5.7L No Start VIN: 3GNFK16RX1
sorry about the delay on this fix. all of the replys were goog- but this was a two fold problem.problem 1 was a chaffed fuel pump feed wire on the frame near the cab ,were someone had repaired steel brake lines.number 2 was a littlle harder the owner of this ...
1999 Chevrolet Silverado 1500 4.3L No Start VIN: 1GCEC14W6X
hi fellows thanks for all the suggestions but none of them was the problem or was of any help 90% of the replies were things i had already tried went back to good old fashoneddiagnostics with the dvom and scope found circuts 1239 ignition b+ and423 ic control ...
2006 Chevrolet HHR LT 2.2L MIL Lamp on, Reduced Power VIN: 3GNDA23D56
Turns out a previous shop repair attempt had frontprobed the ECM connectors instead of backprobing or using the probe points between each pair of circuits in the connector. This GM vehicle and many others use .64 size circuit connectors, both round and square... Trouble codes: P2128 (APP Sensor 2 Circuit High).
2008 Chevrolet Silverado 1500 WT 5.3L cruise control VIN: 3GCEC13J58
Thanks very much to all who replied . Rick from Ohio, GM...Government Motors Chuck from Kentucky, Its possible about the 2 different harness' , just could'nt prove without a whole lot of hassel. Took your advice and gave the techline the part number for t...
2001 GMC Sierra 2500 HD SL 6.6L convertor/pump VIN: 1GTHK29151
First, Thank you to all the techs who replied so promptly to my message. I had the first replies within 15 minutes of posting my help message. Wow! The FIX was the torque convertor. I tried to test by adding dye to to the fluid as per GM Tac, boy what a mess....
2003 GMC Envoy SLT 4.2L ipc VIN: 1GKDT13S43
Thank you to all who replied especially Mickey from New York, for the info about Advanced Auto Electronics. Called them up gave them vin, mileage and a couple other things they sent me the unit in 2 days, installed in truck and all is good. DID NOT have to go ...
2006 GMC Envoy SLT 4.2L noise VIN: 1GKDT13S76
thanks for all replies it was air pump sounded like aircraft engine had one guy start vehicle i stood underneath and verified noise from air pump thanks again
2009 GMC Sierra 1500 SLE 5.3L brake controller VIN: 1GTEK29J09
Thank you for replying so quickly. The GM TSB was exactly the information I was looking for. I was just kind of surprised that I had to run a wire all the way to the back of the truck! I've done this procedure on GM trucks a few years ago and you just had to o...
1988 Oldsmobile Cutlass Supreme International 2.8L No Start VIN: 1G3WR14W2J
I would like to thank everyone for there help. After replacing the Pcm with a AC Delco and having the same results I decided to retrace my steps. One thing I didn't think of and didn't mention was this vehicle has lots of oil leaks,well from personal experienc...
1996 Pontiac Bonneville SE 3.8L No park -no drive
Answers I got were--input clutch--park is 100% mechanical,broken hard part(had issue with park rod bullit failing)--low roller clutch--overrun sprag--and 2 said input sprag. Took pan down and found alot of metal shavings. Took tranny out and sent to tranny sho...
2002 Pontiac Grand Am SE1 2.2L No Start VIN: 1G2NF52F92
After discussing it with customer, decided to bypass system. Tested battery and connections, wiggled wires and connectors from passlock to BCM, couldn't get the voltage to change any, still convinced it is crappy passlock sensors. I've done dozens of these b... Trouble codes: B2960 (Passlock Data Incorrect).
2003 Saturn L200 2.2L odometer/d r l's VIN: IGJU54F93Y
thanks very much to all who replied apparently this is a very common problem [bad bcm] and i was unaware of it ,you guys are great and very helpful thanks again
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