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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 13, 2011
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue 3.8L No Start VIN: 1G4CW52K5W
This vehicle was brought in on the hook. The customer complained of hearing a loud popping sound then vehicle died and would not start. The vehicle cranks but makes an abnormal sound, almost like the timing is way off. It attempts to fire but will not run. Tes...
2004 Cadillac CTS 3.6L 3-2 Coastdown VIN: 1G6DM57794
Customer states this started only recently, has owned car since new. When cold, & I have verified this, you get a pronounced 3-2 coastdown clunk, goes away after driving about 5 miles. There are no DTCs, I've reset trans adapts, drove cold with scanner & see...
1982 Chevrolet C60 C6D062 5.7L Excessive Emissions, Poor Fuel Economy VIN: 1GBG6D1A3C
I'm normally an Import guy, but I was talked into this by a friend. Carburetor fills until fuel is running out the jets. Overhauled carb, no help, installed another needle and seat from another source, no help. Have studied float, float level and operation car...
2002 Chevrolet S10 4.3L Misfire VIN: 1GCCS19W82
hello there, I have no clue whats wrong with this truck. 02 s10 w/4.3. It has a misfire code(p0300). #3 and #6 misfire @ 1800rpm and i have no clue why. I replaced the crank sensor and added shims but no luck! Whats crazy is that when i remove the brake booste... Trouble codes: P0300 (Misfire random)
2004 Chevrolet Impala 3.4L Instrument Panel VIN: 2G1WF52E54
Several weeks ago this car came in to our shop. The customer stated that the speedometer didn't work. As soon as I climbed in the car I noticed that none of the gauges worked. I did a gauge sweep test with the Tech 2, and they all started to work. Perhaps this...
2004 Chevrolet Silverado 1500 Z71 5.3L Fuel gauge VIN: 2GCEK19TX4
This truck has a fuel gauge stuck on Empty. I first checked for gauge operation by unplugging connector at fuel tank and grounding sensor wire. Still no movement on gauge. Checked all fuses- good. All other gauges work properly. Replaced the cluster with a rem...
2004 GMC Envoy XL SLE 4.2L torque convertor clutch VIN: 1GKET16S34
Hello gentlemen, this 04 envoy acts like it needs a reflash, but I can find no new calibration to fix this intermittent TCC lockup problem. As long as you drive 70mph or faster the slip rpm is less than +5. At 69mph or below the convertor goes in and out of l...
2006 GMC Canyon SL 2.8L ignition key VIN: 1GTDT19646
The battery goes dead on this truck at times because you can turn the key off and pull it out of the vehicle and the truck will still keep running or at times it will just act like the key is in the on position when you pull it out with the engine off the dash...
1998 Pontiac Sunfire SE 2.2L No Start, Stall VIN: 1G2JB5243W
This car was brought to us for start and stall within seconds. Found 2 DTC P1629 and U1016. We were able to get vehicle to start if you turned the key in a certain position. Replace Cylinder lock with sensor and key, reprogrammed key. Vehicle will still not st... Trouble codes: P1629 (Theft Deterrent System Fuel Enable Circuit Incorrect Signal Detected During Crank.), U1016 (U1016 - Loss of Class 2 Communication with VCM.)
2004 Pontiac Grand Prix GTP 3.8L Abs Module VIN: 2G2WR52474
I have a 04 Grand Prix GTP that has a code CO550.ABS,red BRAKE and trac lights on.The flow chart from Alldata is short and sweet.If code is current which it is no further diagnosis required-just replace EBCM.A new one was $1200.00.Due to cost customer asked me...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Park Avenue 3.8L Stall VIN: 1G4CW52K4S
Cleaning the IAC and Throttle Body seems to have cleared the stalling issue up. THanks everyone for the assistance. Trouble codes: P0325 (Ign system problem Elec SPark Control ESC Failure), P0705 (PRNDL Switch Failure).
2004 Cadillac XLR 4.6L MIL Lamp on VIN: 1G6YV34A24
Hi guys, sorry it took so long, finally got this one out of the shop but its still not 100%. Changed the throttle body and the car no longer kicked codes on startup. It actually doesnt do it very often at all anymore, only sometimes at WOT on the highway! None... Trouble codes: P1101, P0068.
1996 Chevrolet Blazer LS 4.3L heater or dash VIN: 1GNDT13W1T
Thanks to everybody,never disapointed with iatn members.We are held in high regards by my customers.This was something I doubt I would have knowned.I pulled the hose off the heater core and filled the rad,and just as it was explained that worked.Thank you all....
2000 Chevrolet Tracker 2.0L Input Speed Sensor VIN: 2CNBJ13C4Y
narrowed down to replacing the ECM-ordered one from out of state salvage yard who forgot to ship it-customer got p.o.ed and took it without fixing it-thanks for all the replies-if she brings it back will post fix
2004 Chevrolet Silverado 1500 Z71 5.3L 1-2 and 2-3 shifts VIN: 2GCEK19TX4
Well I am happy to say that this vehicle is fixed. Thanks for all the replies. The suggestions to check the MAF sensor were right on. After driving the truck with the sensor unplugged the pressures went to normal. I tried cleaning the sensor but that didn'...
2004 GMC C5500 Topkick C5C042 6.6L No Start VIN: 1GDE5C1134
we finally got a scope and within 10 minutes found the crank sensor was going in and out, after further, we have found that the exciter ring on the crank has broke off. we have ordered the part, and will be finishing the repair soon. we are confidant that this... Trouble codes: P0374.
2002 Saturn Vue 3.0L Fuel Gauge VIN: 5GZCZ63B52
Put in a new BCM and all is well.Only Gm can over complicate a fuel gauge.
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