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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 9, 2013
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Open Help Requests for GM
Help Request Answers
2002 Buick Rendezvous CX 3.4L No Start VIN: 3G5DA03E32
This van will intermittently not start. When it happens, there is fuel pressure and spark. No injector pulse. It seems if you let it sit for awhile it will start back up. There are no codes present. It never stalls while running. It shows cranking rpm on Te...
1995 Chevrolet Tahoe LS 5.7L 30 kv at idle VIN: 1GNEK13K7S
Truck came in for missing and stalling. Found coil wire arcing to coil body. Tuned up and fine for now but firing 30 k at coil wire and 25k at plug wires at idle. Fuel trims indicate not lean and timing is correct. Receipts in truck indicate this has been happ...
1996 Chevrolet Tahoe LS 5.7L No Start VIN: 1GNEK13R1T
Please help. We have replaced the fuel pump assembly on this Tahoe 3 times previously. Now it is back again. Vehicle originally came in as a no start. Checked spark and fuel. No fuel pressure. Easy, needs a fuel pump. We installed an aftermarket unit and repla...
2002 Chevrolet Impala LS 3.8L Cuts out VIN: 2G1WH55K32
Thanks in advance for any help I'm pulling my hair out on this one. Car will cut out for a a second and then keep running. It will do it a t idle in the bay and also out driving under load. While this happens I loose communication with the scanner. As soon as ...
2003 Chevrolet Tracker ZR2 2.5L No power VIN: 2CNBJ73473
Customer came in complaning of rattle noise in engine, and said when the oil was changed a screw driver had to be stuck in the drain hole to get oil to flow. Told customer noise was from chains and it may be do to sludge, recommended pulling valve covers to ch...
1998 GMC Sonoma SLE 4.3L Cuts out VIN: 1GTCS19X7W
car came in with a misfire problem. custumer had coil and module so we repalced those and made no differance. scoped cam sensor and found dropouts so replaced it then test drove and worked fine. next day upon startup truck runs like it did when it arrived. so ... Trouble codes: P0300
2005 GMC Sierra 1500 SLE 5.3L windows, door locks, radio, dome light VIN: 1GTEK19B15
Hello all. This is my first inquary, hope all is well. 2005 gmc pick up 5.3 4x4. cust states drove fine to home, next morning would not start. security light on radio was inconsistant at first, now non existant. truck will crank and fire, then die. power windo...
2007 GMC Yukon XL 1500 SLE 5.3L gauge cluster VIN: 1GKFK16337
customer came in stating at night, the back lighting on the gauge cluster will flicker and is very hard/ near impossible to see regardless of potentiometer position. however, the HVAC control, radio, dimmer switch and radio control buttons on steering wheel fu...
2004 Oldsmobile Bravada 4.2L MIL Lamp on VIN: 1GHDT13S14
This problem is intermittent. Check engine light would come on with this code about every 50 miles. The light would even go out on it's own most of the time. The first thing I did was simply replace the map sensor with no test. (most common failure) Customer r... Trouble codes: P0106 (Map sensor performance)
2001 Pontiac Sunfire GT 2.2L transmission VIN: 3G2JB52481
transmission either slips in and out of second gear or is downshifting. this happens as soon as into second. it feels like it is going in and out of second. observing data stream for trans shows nothing abnormal. misfire data stream shows all cylinder misfire ...
2000 Saturn SL 1.9L No Start VIN: 1G8ZF5281Y
We are in the process of reflashing a 2000 Saturn. The OE pcm went bad, GM doesn't carry this PCM anymore so we were forced to get an aftermarket unit. After many attempts to reflash we keep getting error code E 4401 Reading vin from device or controller faile...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Buick LeSabre Custom 3.8L starter & fuel controll VIN: 1G4HP52K2W
Thank you to everyone who replied.I cut the wires under the steering column between the ignition switch main connector & Column; two small white wires, housed in orange(NOT YELLOW)sleeve soldered in a 1.86K ohm resistor to the vehicle side of the harness & per...
1995 Chevrolet K2500 Suburban 7.4L Poor Idle Quality, Hesitation, Stall VIN: 1GNDT26N3S
Sorry it took me so long to reply. I am a newbie, and could not figure out how to re-reply. Balancer is dead on at TDC. Timing is set to spec at 4 degrees. Fuel pressure is 28 psi. throttle body gasket replaced. all distributor parts replaced with GM par...
1998 Chevrolet Express 1500 LS 5.7L No Start VIN: 1GBFG15R8W
Thanks guys Leon, Tim, & Alex were right on the money.If you lay on your back and look straight up at the passenger side of the steering column you wil see the wiring to the module. It's kind of hidden. Thanks to Alex on the tip using the resistor.The customer... Trouble codes: B2960.
2000 Chevrolet Blazer LS 4.3L Poor Idle Quality, Cuts out, Misfire, MIL Lamp on VIN: 1GNDT13W6Y
Thanks for all the help every one. we have and are currently trying all suggestions. The Lifter/valve noise is getting better with every thing we are trying and has become more and more intermittent. customer is currently driving vehicle and keeps us informed ... Trouble codes: P1351, P0300.
2004 Chevrolet Silverado 2500 6.0L No Start, No Communication VIN: 1GCHK24U34
My apologies for not closing this request sooner. After getting acquainted with the operation of the LineSpi and scoping the various modules, I was able to plod my way through the problems. Hooking up the labscope to pin #2 showed all kinds of 7 volt signals e... Trouble codes: U1000 (Class 2 Data Link), U1300 (Class 2 Data Link Shorted), U1301 (Class 2 Data Link Shorted), U1305 (Class 2 Data Link Low or High).
2004 Chevrolet Silverado 1500 LS 5.3L Unknown VIN: 2GCEK13TX4
I replaced the clutches in the transfercase and the noise went away. Thank you for all your help. I own a set of chassis ears that pointed me in the right direction.
2006 Chevrolet Uplander LS 3.5L stuck 2nd gear VIN: 1GNDV23L96
Thank you for the help, I had a pinched harness. Repaired it and all seems well. Thanks again.
2007 GMC Acadia SLT 3.6L Park Assist VIN: 1GKEV33737
Ok here we go everyone is on the same tsb with the daisey chain xmas tree repair. All of us old high tech guys want to see the data transfer and determine what one is bad from the signal results, Scrap that Idea It drives you nuts Had a 4 chanell lab scope ...
2007 GMC Sierra 1500 SLT 5.3L transfer case VIN: 1GTEK19017
Thanks to all.The grounds were coroded and we had to replace the shift motor.When power applied it would only work sometimes.
1999 Pontiac Grand Am SE 2.4L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1G2NE52TXX
it was as atn members advised.pcm was shorted on that driver and R&R pcm and all is good Trouble codes: P0200.
2007 Pontiac G6 GT 3.5L No Spark VIN: 1G2ZH58N87
Apparently my spark tester was not working or shorted to ground I had spark the whole time poor fuel caused this vehicle to not run at all. flushed fuel system and put fresh gas in and all is ok at this time. Thank you all for your help.
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