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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 20, 2009
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Custom 3.8L No Start VIN: 1G4HR52C7R
This car came in and the lady said it died and would not restart, then after sitting in the middle of the street for a couple minutes it started. She came straight to my shop. I started the car several times and it seemed fine for me. I was going to make an ap...
1994 Buick LeSabre Custom 3.8L No Start, Cuts out, Stall VIN: 1G4HP52LXR
Good morning everyone. I Have A Buick I just can not get rid of. The customer first brought the car in for a standard oil change & full tune up,"spark plugs, spark plug wires, fuel filter, and fuel injection cleaning. When the customer went to leave his car st...
2000 Cadillac DeVille 4.6L vehicle theft system VIN: 1G6KD54Y7Y
This Caddie came in w/sevice theft system message on dash.Scanned system w/tech2 and found code B3031 theft system in learn mode.Followed chart per MOD for B3031 and indicated to replace VTD module.First VTD module would not learn keys and tried to perform 30 ...
2002 Cadillac Seville SLS 4.6L Cuts out VIN: 1G6KS54Y12
Engine starts and runs fine, but every 9 days or so, just quits while driving, and restarts ok. No codes, monitors are up when we check them after the stall. Thanks in advance, John.
1993 Chevrolet C2500 Suburban Silverado 7.4L No Start, Poor Idle Quality, Stall VIN: 1GNGC26N2P
Good morning all iatn techs. this surburban came on the hook as no start. i have good spark and fuel pressure but no injector pulse. the vehicle wiil run on alternate fuel(brake clean). i found battery voltage at the injectors but no noid light action. my scan...
1994 Chevrolet Blazer 5.7L Oil System VIN: 1GNEK9RJ35
Engine has no upper end clatter or tick. Just has a slight chirp when started cold. I removed belt to rule at drive system. Noise continued. I removed the valve covers to find there was no oil coming up the push rods when cold. After a few minutes there would ...
1998 Chevrolet Malibu LS 3.1L Fuel Gauge VIN: 1G1NE52M0W
Need to know if there is a simple fix for this situation, other than taking instrument cluster out.
1999 Chevrolet K2500 Suburban 7.4L MIL Lamp on VIN: 3GNGK26J4X
here is my question. I dropped this burb off at the local dealer with the new vcm in the passenger seat and old vcm still installed so he could pull it in. when i got the burb back with new vcm installed and programed it had an ses light on and my 1336 was ret... Trouble codes: 1336 (crankshaft variation not learned)
2000 Chevrolet Astro 4.3L Poor Idle Quality, Hesitation, Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCDL19WXY
Hello to all, this is my first time using this so bear with me. i have this astro that keep throwing missfire codes on cylinders 3 and 4. after clearing codes the missfire comes back on cylinder 3 then clear them again and the new code is for cylinder 4 only. ... Trouble codes: P0300 (Random/Multiple Cylinder Misfire Detected), P0303 (Cylinder 3 Misfire Detected), P0304 (Cylinder 4 Misfire Detected)
2001 Chevrolet Blazer LS 4.3L Starting VIN: 1GNDT13W21
i replaced the heads afterwords i have no spark if i crank for 5 sec or so it trips a crank sensor code i replaced sensor no help replaced coil pack ign control module plugs wires cap roter still nothing i have 12v and ground at coil distributor and crank sens...
2001 Chevrolet Impala 3.4L No Start VIN: 2G1WF55E71
This car came in with crank but no start. customer said it was acting up earlier in the day. Fuel pump runs and has fuel pressure. Can not connect my fuel pressure gauge because of the power steering hose is in the way. Have plenty of fuel when pushing schrade... Trouble codes: P1189
2001 Chevrolet Astro 4.3L Mechanical VIN: 1GCDM19X92
vehicle came for a water pump. upon further inspection the lower intake was leaking. installed lower intake with no major complications. after installation my attempt to start vehicle was unsuccessful. timing was off so i proceeded to set timing from the begin...
2002 Chevrolet Trailblazer LS 4.2L Encoder Motor VIN: 1GNDT13S22
Does anyone know how I may change the position of the Transfer Case encoder motor on the bench? I have a new one that is out of position based from a bad transfer case and is way out of position for the replacement to install at this time. New encoder was on t...
2003 Chevrolet Silverado 1500 5.3L Poor Idle Quality VIN: 1GCEK19T63
Vehicle came to us running poorly, low power and check engine lamp flashing. normal diagnosis, found the cats broken up and plugged. replaced all 4 oxygen sensors and cat pipe, cleared codes and drive cycled. ran great until next morning. after a hot soak 2-3 ... Trouble codes: P0300
2004 Chevrolet Silverado 3500 LS 6.6L removal information. VIN: 1GBJC34254
We need a little help on a job we are unfamiliar with.we have to replace the injection pump on this vehicle and the procedure on mitchell only says remove 4 pump bolts and remove pump.I can not find the procedure for gaining access to those 4 bolts.If anybody ...
2007 Chevrolet Impala LT 3.5L MIL Lamp on VIN: 2G1WT58N77
Well I have this 07 impalla that keeps setting p0411 . I do not have a trobleshooting tree. I was able to turn on the pump with my modis but thats all i can do at this point. Any Ideas or does someone have a trobleshooting tree? Trouble codes: P0411
1995 GMC C1500 Suburban 5.7L Radio VIN: 3GKEC16K6S
Hi and thanks for any help . suburbans radio won't let me enter the security code if you try to enter the code the display reads INOP . The wrong code was entered three times and then it started to display Inop is there any way to unlock this radio ? any help ...
2000 GMC Jimmy Diamond Edition 4.3L temp control VIN: 1GKDT13W1Y
no temp control. no a/c. when a/c button is pressed, a/c indicator blinks and shuts off without turning on compressor. when temp control knob is turned from cold to hot, there is no temp change. always cold. when i reset system everything works(a/c, heat and t...
1996 Pontiac Grand Am SE 2.4L abs module VIN: 1G2NE12T5T
I don't know what we are missing. This car came in with ABS light on, trac off light on, the air bag light on, and intermittant theft light blinking on dash but the car starts and runs. We have commication with the ECM but not the ABS module or the Air bag Mod...
1997 Pontiac Grand Prix SE 3.8L Cuts out, Stall
Help-real good customer has intermitten stall problem when turning to the right mostly,car will start right back up with no problem,no codes,can't tell if problem is fuel or ignition,won't do it everytime-3 times in the last month.Suspect steering column issue...
2005 Pontiac Aztek 3.4L temp gauge VIN: 3G7DA03E55
vehicle temp gauge goes above half way at times almost to the hot side but it does not do it all the time,fans are working,and performed cumbustion leak check for possible blown head gasket found no problems also replaced radiator and temp sensor checked for c...
1997 Saturn SL2 1.9L head/headgasket VIN: 1G8ZJ5277V
Howdy IATN Techs, Car was towed in as a no start, after the compression and leak down test pulled head. Severe carbon build up,little old ladys car. So I sent the head out for a valve job,and resurfacing. Put it back together,and it fired right up. After warm...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick Century Custom 3.1L Surge VIN: 2G1WS52J4Y
Thanks to all who replied. The problem turned out to be a bad mass air flow sensor and the only way I found it was to substitute a known good one for it. The scanner readings and tests all showed the unit to be good.
1996 Cadillac DeVille 4.6L MIL Lamp on, HIGH IDLE VIN: 1G6KD52Y1T
Cadillac is fixed. Relacement of the intake manifold took care of the high idle complaint. Tried new intake gaskets, but after rechecking with smoke machine, leak from underneath of intake was worse. Took old intake back off and found that intake ports were wa... Trouble codes: P0507.
2000 Chevrolet Venture Warner Bros. 3.4L cooling system VIN: 1GNDX13E5Y
Thanks for all the help to all. The problem finally showed itself. After a good romp on I-95 (15 miles on local highway) the Block Checker showed a change in color of the fuild. However, the customer refused the job and I could not get any useful visual confor...
2001 Chevrolet Suburban 1500 5.3L ride control VIN: 3GNFK16T01
Thanks for the replies. Replaced the compressor, cleared the code and did a recalibration with my tech 2. Works like it should.
2002 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: IGCEK19T22
As I suspected most replies mentioned the problem with the intake gaskets, I do know that the locking retainer clip is broken on the MAF. We plan to replace the MAF because of this and go from there. Just got to get together with my brother and get on it. BUT ... Trouble codes: P0171, P00, 174 (Lean Bank 2), P00, 300 (Random multiple misfire).
2004 Chevrolet Tahoe LS 5.3L Steering VIN: 1GNEC13V44
thanks again guys, we had 10 replies, and all but 2 hit it right on the head. we replaced the gear box and it steers like a dream .
1998 GMC K1500 Sierra SL 5.7L Temp Gauge VIN: 2GTEK19R2W
It's fixed. After thinking on it overnight I decided to try one more test before I pulled the trigger on a replacement cluster. I had an identical vehicle in the shop so I jumpered both the chassis together with the negative ends of my jumper cables then jumpe...
1992 Oldsmobile Cutlass Ciera S 3.3L Excessive Emissions, Poor Idle Quality, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1G3AJ84N6N
after all the tests and changing parts, it turned out to be the ECM causing the problem we installed new one and car ran fine. we also put new ignition wires on. Trouble codes: 42 (ESC code).
1999 Saturn SC2 1.9L No Start VIN: 1G8ZH1270X
Thank you For The Help Every One Was Right I Put A Dealer Crank Sensor In The Car And It Fired Right UP. The Customer Has Had The Car Back For A Few Weeks And Has't Had Any More Starting Problems . Once Again Thank You For All The Help.
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