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Prev Professional Automotive Repair Technical Discussions for January 9, 2008
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Open Help Requests for GM
Help Request Answers
1996 Buick Skylark Custom 3.1L Theft light VIN: 1G4NJ52M4T
See above
1998 Buick Century Custom 3.1L wipers VIN: 2GAWY52M9W
This vehicle came in with inoperative wipers. After testing, replaced motor and circuit board as motor was burned. Wipers worked well but would intermittently not shut off, seemed to shut off more often after using washers and then going to off position, custo...
1998 Buick Park Avenue 3.8L flywheel VIN: 1G4CW52K8W
This Buick is NUTS. There is a squealing noise from the flywheel area. Was sure it was the flywheel so we replaced it...still has the noise. While engine is running if you spray oil between the engine and flywheel the nois temporarily goes away. The noise is a...
1996 Chevrolet Tahoe 5.7L Poor Idle Quality, MIL Lamp on VIN: 3GNEK18R9T
As far back as history tells- Truck ran good with no CEL. A coolant leak started @ intake and was rpaired by another shop. Cust brought here for a complaint of Po1345 after the intake job-we corrected distributor and runs good etc. Other work (susp lower kit w... Trouble codes: 101 (maf)
1996 Chevrolet Cavalier 2.2L Cooling fan VIN: 1G1JC1240T
Car came in with no cooling fan. We tested the ect it runs up to 226 and fan does not come on. If you ground the dark green wire at ecm circuit 335 it comes on. We checked the grounds at the ecm . Circuits 413 551 451. Grounds g101 and g110 were clean. Took th...
2000 Chevrolet Silverado 1500 5.3L Misfire VIN: 1GCEK19T2Y
Ok techs, I need help. Please read all of the post this truck came to me with a misfire code and the cylinders counting up were #3 and #4. had new plugs and wires. ignition scope analyzed. patterns looked ideal. no noticeable difference in any patterns. tried ... Trouble codes: P0300 (Random multiple cyl misfire)
2001 Chevrolet Silverado 2500 6.0L Misfire, MIL Lamp on VIN: 1GCGC24U11
This engine is bugging me. It came to me with flashing CEL code PO300. I checked misfire counter and #2 and #7 were counting misfires regularly at idle and PT. No. 7 is the worst by far. The engine has an audible miss at idle and throttle snap but plenty of po... Trouble codes: P0300
2001 Chevrolet Express 3500 5.7L starter VIN: 1GCHG35R01
We have a wierd one here. Came in on the hook with a no crank/no start condition. Another shop had installed an ignition switch, then suggested the starter was bad. Initial testing showed no power to the solenoid energizing wire, battery voltage at the large c...
2002 Chevrolet Avalanche 2500 8.1L No Start VIN: 3GNGK23G42
hi hope you can help truck drove in with intermitted no start and crank sensor code. replaced the sensor no easy task. now no start and still get the code sometimes. new computer and wiring to the sensor. same lab scope show good crank signal to computer but s... Trouble codes: P0335 (crank sensor ciruit a fault)
2002 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GNDT13S52
hello to all members of iatn we are really up against it here any help would be appreciated. about 3 months ago this trailblazer came to us with a random cylinder misfire and also would cut out intermittantly. the person who owns it took it to a local dealer t... Trouble codes: P0601
2003 Chevrolet Impala 3.4L Mechanical VIN: 2G1WF52E63
Customer called and stated that oil leaking under his car,towed in.Found oil filter gasket blown out side of filter.Replaced filter and refilled with oil,gasket blew out again.Anti freeze is low.Oil cap has yellow goop under it and rad has same goop in it.
2003 Chevrolet Silverado 2500 6.0L Differential VIN: 1GTGK13U3E
When cold acts like it has resistance taking off from a stop. Maybe like 4x4 is engaged. Also makes a grinding noise. Gets worse when turning. New job, no work done yet. Ran into this before with another vehicle, never got problem to happen with me, customer t...
2003 Chevrolet Silverado 1500 5.3L Cuts out VIN: 2GCEC19T43
hi all customer drove in complaining of random engine quitting. I let it run for a while and then shut it down and sure enough it would crank but no start. gave it about 30 seconds and she fired right back up. no codes, nothing I can see. Crank sensor?? I did...
2004 Chevrolet Silverado 1500 5.3L oil guage VIN: 2GCEC19T24
Hey guys, I have a customer with a oil pressure guage that is reading way past 80 psi, it is at twenty after on a clock. I called my good friend at the chevy house who does heavy line and he said he see's it all the time and he just replaces the pressure swi...
1999 GMC Savana 2500 5.0L 3-4 shift VIN: 1GTFG29M8X
i have a fleet van here that had a burnt up trans and was replaced in sept. only 8000 km later trans is burnt up again, this trans was rebuilt and instaled by a reputible tran builder locally as we dont do trans work. sent van to rebuilder, new rebuild install...
2001 GMC Yukon SLE 5.3L Poor Idle Quality VIN: UNKNOWNATT
customer had truck towed in no fuel pressure.fuel pump tested bad. replace fuel pump,fuel filter now truck idles at 500/600 rpm.seems to idle fine in shop,put in gear and truck almost dies out.truck has the throttle by wire. any help would be greatly appreciat...
2004 GMC Envoy XL SLE 5.3L air springs VIN: 1GKET16P14
Hello everyone! I need help!!! We replaced rear end on this truck and it has a air ride springs on the back. Now it wont pump back up. We tried to do calibration on sensor as per Mitchel, but still no help. Is there any trick to this system? Any help is apres...
2005 GMC Sierra 1500 SLE 5.3L Limp in mode VIN: 1GTEC19T35
Truck came to us with PO740, PO785 and PO753 stored and transmission not shifting correct. I put a voltmeter on the Ignition 0 fuse in the inside fuse box and drove like this the problem did not happened I also put a head lamp on this fuse to load the wire and...
1990 Oldsmobile Cutlass Ciera SL 3.3L Torque steer, instability VIN: 1G3AM54N6L
Hello group, This car came to us for struts and tires. Due to normal wear with almost 200,000 miles. We found both axel boots torn and replaced with new half shafts. So, we have installed 4 new tires, 2 front gas struts and 2 front axels and performed an align...
1993 Oldsmobile Cutlass Ciera 3.3L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G3AG54N2P
Hello all,we have had this car for 2 days with no answer to the problem.Today we did notice that cold start up the engine idle unstable then a/c compressor comes on/off then the cooling fan comes on the the engine shuts down.Right before the a/c comes on we lo...
1990 Pontiac Sunbird LE 2.0L No Start, Poor Idle Quality, Hesitation, Stall VIN: 1GZJB54K0L
during a cold crank,there is fuel coming from the tbi injector but not enough to start the engine.if i spray dry gas in the tbi,the vehicle will start and run but it will not run at a hi idle and therefore it will run rather sluggish until the engine warms up,...
1993 Pontiac Grand Prix LE 3.1L No Start, MIL Lamp on VIN: 1G2WH54T2P
well this is my worst nightmare. this car has 11 trouble codes no spark or fuel pulse spent 5 hours on this pig and figured it needed a new computer so i installed new ecm with no luck , wondering if i need a prom too but im not sure any thoughts would be grea... Trouble codes: 46 (vechicle antitheift system), 57 (prom error), 86 (internal ecm problem), 53 (system voltage too high), 16 (batt voltage too high or low), 43 (esc module or sensor circuit problem)
1998 Saturn SW2 1.9L wipers VIN: 1G8ZK8274W
Hello fellow Techs. This Saturn has a wiper problem. They work only in the high position. In the delay mode they work constantly in position 2 and 3. Also in position 3 the washer pump works constantly.I tested the resitance values out of the wiper switch from...
2002 Saturn SL1 1.9L Forward Engagement VIN: 1G8ZH52832
Customer dropped off car because of an engagement problem first thing in the morning. Of course, we checked it cold in the morning and everything worked fine. We did find a ratio code for 1st gear though. There is also a noticable clunk when shifting from neut...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac Seville STS 4.6L Oil pressure warning VIN: 1G6KY5290V
Hey everyone, thanks for all the help! I have performed TSB # 47-62-32B and the problem seems to be gone. I was a little nervous over filling the crankcase by 10 qts but many of you thought it would do the job and apparently it has. Thanks again for all the he...
1993 Chevrolet Cavalier RS 2.2L Starting VIN: 1G1JC144XP
Thanks for everyones suggestions. It was the ignition control module. I really thought that was the problem, but wanted some confirmation, especially since the problem occured just after I replaced the muffler. There were suggestions that some parts store c...
2004 Chevrolet Cavalier LS 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G1JF12F44
The Cavalier is fixed. I cleaned the injector tips and o-rings proir to reinstallation, also moved injector installed positions(#1 went to #3 hole, #2 went to #4 hole. After this the car started and ran 100% better. No current or historical misfires. Even tho... Trouble codes: P304.
2004 Chevrolet Silverado 2500 6.0L Antitheft VIN: 1GCHK24U14
Thanks everyone, I will be replacing the entire column and performing the theft relearn procedure as suggested by many of you. thanks
1999 Oldsmobile Alero GL 2.4L radio VIN: 1G3NL52T9X
First of all I would like to thank everyone for taking their time to respond and help me out. Once I inserted the code 0449 and hit the power switch, the radio came on!! I have written down this code in the owners manual to be helpful to someone else in the ...
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