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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 4, 2007
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1988 Cadillac DeVille 4.5L compressor VIN: 1G6CD515XJ
Hey you cadi guys out there. I really need some help on this problem child car came in with a/c inop.pulled codes had code for low freon in system. Had r-12 in it talked customer into retro fitting system to r-134-a on initial exam.found evap.leaking and compr...
2001 Cadillac DeVille 4.6L Suspension VIN: 1G6KD54Y61
Customer has complaint of noise in rear of car mainly on left turns. We installed new Delco air shocks last year and now she says noise is back. Dealer told her it was the rear shocks. We changed them again today but seem loud on the rack when shaking back and...
1994 Chevrolet S10 Blazer Tahoe 4.3L No Start VIN: 1GNDT13WXR
This vehicle came in with a no start condition. The customer had replaced the module and said there is still no spark. no codes. i check the pic up coil was bad replaced it and had a great spark. I also replaced the plugs wires cap and rotor. The vehicle still...
1995 Chevrolet C2500 Cheyenne 6.5L tdc VIN: 1GNGR6F5SN
Hello friends. I have a silly qiestion here. We're trying to relearn the TDC on this vehicle with a tech II. There is no information on how to do this anywhere. So... GM Diesel techs, please help us out. We need to know the TDC relearn procedure on this vehicl...
1997 Chevrolet K3500 Cheyenne 6.5L front brakes VIN: 1GCHK33F5V
This 1 ton single rear wheel truck has had this problem before another tech replaced the hydra boost with a OEM booster. Well it's back. The problem occurs when coming to a stop and when you drop below 10 mph you can feel the front calipers release I dont know...
1997 Chevrolet S10 LS 4.3L No Start VIN: 1GCCS19X1V
I could use some advise on this one. 1997 Chev S10, has sat at our body shop for a couple years. I bought it and am trying to get it running again, it did run and drive when it came in. No spark, fuel pressure, fuel pump relay no fire, fuel gauge reads high on...
1997 Chevrolet K1500 Cheyenne 5.7L Cuts out, Misfire, MIL Lamp on VIN: 2GCEK19R6V
This truck came in for intake gasket leaks. While doing the intake, we noticed the ear was broke on the distributor. Replaced the distributor with new ac delco. vehicle returned within a week with the cam sensor codes.Found new distrubutor to be defective(or s... Trouble codes: P0340 (cam position sensor circuit), P0341 (cmp perfromance), P1345 (ckp/cmp position sensor correlation)
2000 Chevrolet S10 2.2L engine area noise
Howdy everyone. What I have here is a 2000 Chevy S10 pickup. It has a 2.2 liter 4-cylinder gasoline engine. It was recently sold from our used car inventory with no noise or problems. Customer drove truck about 1300 miles and brought it back to us for a whistl...
2002 Chevrolet Silverado 2500 HD 6.6L Hard Start VIN: 1GCHK29112
I need help from a duramax diesel tech. This thing is a hard start!! Cranks for 3-5 seconds before it barely starts and that is after I pump up the primer 30 pumps. Once started, it runs great with full power. This happened suddenly, has been starting & runnin...
2003 Chevrolet Suburban 1500 LS 5.3L MIL Lamp on, low power light on VIN: 3GNEC16T33
Upon checking with scan tool. I discovered that with key on and engine off I have scan data to tac module. As soon as I start the engine, I lose scan data. At times, I also lose PCM data. Usually only while driving. But tac data wont return until you turn off ... Trouble codes: P1518 (Throttle actuator control)
1998 GMC Jimmy Envoy 4.3L Excessive Emissions, Stall, popping on accel VIN: 1GKDT13W1W
Please Help!! We have ran out of ideas. Truck runs great after warm. Only On cold start within first 10 minutes dies right out. Vehicle pops on acceleration thru intake we can feather gas pedal sometimes to allow the truck to rev up. Please note all parts list... Trouble codes: P0300
2000 GMC C2500 Sierra SL 5.7L braking VIN: 1GTGC24R9Y
Brake were replaced at a tire shop rear brakes found to be replaced wrong secondry pads one side primary pads other side drums oval replaced drums and also replaced pads the correct way.Then power bleed system problem still there replaced master cylinder thoug...
2003 Hummer H2 6.0L Hesitation VIN: 5GRGN23U63
Customer complained of hard start hot. After driving for 15 min or more and stopping for a short time, the truck cranks over for at least 1 minute before firing. Pressing throttle makes no difference. Truck displays 65psi pressure while cranking and holds pres... Trouble codes: P0300
2000 Oldsmobile Alero GL 2.4L Poor Idle Quality VIN: 1G3NL12TXY
This car has a high idle all the time, usually around 1200 rpm in park. IAC can be driven with the scan tool but on the data list it's usually hanging at around 60. The TPS is where the trouble seems to be. At idle it is at 0.59v which I believe is normal but ...
1990 Pontiac 6000 LE 3.1L Fuel Injection VIN: 1G2AF54T0L
Vehicle came in for a no start back in July, we found no spark no inj pulse and the ignition module was replaced. Car ran fine until the end of September, when it was brought back in for a no start again. This time there's spark but intermittent loss of inject...
1999 Pontiac Grand Prix GT 3.8L No Start, Stall VIN: 1G2WP52K4X
vehicle came in with an intermttent stall,(only on start up.) vehicle will start and run fine untill stall ocurrs.(run time about 10 sec.) this will happen somtimes multiple times. injector pulse,spark,and fuel pressure are all ok untill stall. i reviewed all ... Trouble codes: P1626 (anti theft deterent fuel enable signal lost), P1629 (theft deterent signal no0t recieved)
2001 Pontiac Grand Prix SE 3.1L Excessive Emissions, No Start, Poor Idle Quality VIN: 1G2WK52J71
i recently changed a cmoputer in car, thought pcm was problem with car idling very high and misc gauges on dash not working. started out fuel gauge not working, then car started to idle extremely high. put my solus scanner on it and came up with p1635 ref volt...
2004 Saturn Ion-1 2.2L reverse lights VIN: 1G8AF52FX4
no reverse lights. switch test good.jumperswitch terminals lights work.seems like internal transmission linkage not engaging switch.

Fixes & Summaries for GM
Fix/Summary Answers
1970 Chevrolet Malibu 350CID Master Cylinder
Thanks for all who gave advise. Several suggested checking backing plates for grooves. The front backing plates have massive grooves in them.In fact, the right front has a few tiny spots that daylight shines through! I spent time trying to locate new & us...
1992 Chevrolet Cavalier RS 3.1L Poor Idle Quality, Stall
did find bad injector.customer still deciding if they want to fix it or not.
1999 Chevrolet Cavalier 2.2L alternator VIN: 3G1JC5249X
well it is fixed sorry if I confused any one I thought I said I had 12 volts at bat termnal at the alt any way I in stalled a reman dash and all is well But any one reading this IT is very important you check system for 5VOLT not 12 at L wire at the alt anfte...
2000 Chevrolet Silverado 1500 4.8L Hesitation, LACKS POWER VIN: 1GCEC14V81
2000 Chevrolet Silverado 1500 Engine: 4.8 L / 292 CID / 8 cyl / Gas / OHV Fuel: Fuel Injection Ignition: Distributorless Trans: 4-speed Automatic Transmission (Electronic) Mileage: 120,877 mi Emissions: OBD-II Compliant VIN: [...] Misc Data: JUST H... Trouble codes: P0332.
2001 Chevrolet Silverado 3500 8.1L convertor VIN: 1GBJK39G91
The problem is in transmission but customer refused service.
2003 Chevrolet Silverado 1500 4.8L Int, Steeing Shaft VIN: 1GCEK14VX3
Thanks once again to all who answered. A couple of guys shared their experiences and fixes for the infamous steering shaft problem. Steve asked about the optional vibration reducer on the Borgeson shaft which I did order. It seems the sacrifice for not hearing...
2005 Chevrolet Silverado 1500 4.8L Starting VIN: 1GCEK14V55
Hello, Thanks for all The response.The EBCM code was nothing to due with a no Crank.There is A tsb for A bad ground located under the drivers door for This code This did fix that code. Pin 39 on blue connector was not Sending signal To starter Relay in Crank...
1997 Geo Metro LSi 1.3L headlights VIN: 2C1MR2290V
Doug from CA called this one. A melted connector above the fuse box was the culprit. Others suggested a headlight switch and Adam offered wiring diagrams which would have helped a great deal had it not been for Doug's suggestion. Thanks again iATN.
1995 GMC Safari 4.3L engine VIN: 1GDDM19W1S
Thanks To everyone who responded. Sorry for long delay in posting fix however it has only been just resent that it was fixed. after replacing the spider assy. we found that the vehicle was running lean so we tested to see if indeed we had injector pulse and at...
1997 GMC Yukon SLE 5.7L heater system VIN: 1GKEK13R8V
Thanks to all The wrong head was installed several years ago from a salvage yard we replaced and all works great!
2000 Pontiac Grand Prix SE 3.8L Poor Idle Quality, MIL Lamp on VIN: 1G2WK52J71
thanks to all for all info, howevernew problems have arose. will post on a new help request
2002 Pontiac Grand Prix SE 3.8L antitheft VIN: 1G2WR5132F
This one is fixed!! Thanks to Dennis at Auto & Bike Pros for repeated effort to help me. I would also like to thank Paul Nehoff,Ken [...]. A new new anti-theft module did the trick. The security light turned off, and the Fuel Enable PID w...
1993 Saturn SL2 1.9L No Start, Poor Idle Quality, Stall, Misfire VIN: 1G8ZJ5579P
Well it's been 2 weeks and this saturn has not returned , I found that it had a bad fuel pump. I did a amp draw on it and it was shorting out,when I put a fuel gauge on it had about 40psi and a decent wave form the longer it would run the worse the pattern wou... Trouble codes: 27 (quick quad drive module).
2001 Saturn L200 2.2L heater controls VIN: 1G8JU52F91
Well, as stated in my original post, I was loosing power to the ign 3 fuse in the under hood fuse box (sorry, I don't have a circuit number). The problem was that I didn't have a wiring diagram that showed the power distribution to the fuse. Troy Bednarz helpe...
2002 Saturn L300 3.0L All passenger locks VIN: 1G8JW54R02
This turned int a BCM problem. We had to send it to the dealer to have a new on installed and it reflashed.
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