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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 9, 2014
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Open Help Requests for GM
Help Request Answers
2007 Buick Rendezvous CXL 3.5L battery light cruise control VIN: 3G5DA03L87
battery light comes on when accelerating. If cruise is on it will knock it off.
1993 Chevrolet K1500 Silverado 5.7L timing
I set the base timing to 0btc. connected the computer wire and the timing mark jumps to about 1 inch above the timing tab and the truck buck jumps when you are at low rpm speed is any where from 35 to 55 mph and let off the accelerator and then ez back on it. ...
2003 Chevrolet Express 3500 6.0L Cuts out, Stall VIN: 1GCHG39UX3
Thanks in advance for your help.this 6.0 wont idle iac counts are 310.it is always 50-200 rpms below desired rpms.replaced throttle bodywith dealer reman(it comes with iac and tps)this one has a throttle cable.no change. Replaced pcm.no change.tested and pulle...
1999 GMC Sonoma SLE 4.3L No Start VIN: 1GTCT19W4X
Customer complained that truck would stall while driving and would eventually restart. Sometimes in a few minutes and sometimes it would take hours. Eventually it would not start at all. This is a no crank no start issue. Vehicle was then towed to me. When key... Trouble codes: P0336, P0339
2004 GMC Yukon XL 1500 Denali 6.0L Shuts down ABS and Stability control VIN: 1GKFK66U94
I have a Code C0279 in traction control. Truck stops good and has a good brake pedal. Code appears as soon as the truck hits about seven mph (initialization speed). I can turn on ABS pump with my scan tool. No PCM or EBCM have been replaced and I'm the only on...
2007 GMC Sierra 1500 WT 5.3L transmission or transfer case VIN: 3GTEK13M17
Customers brought this truck to us saying it feels like it goes into Neutral sometimes.. Very erratically. It has done it a total of 4 times to them in about a month so far. I have had the vehicle for the past week and I have put over 1500 miles on it myself a...
2011 GMC Sierra 2500 HD SLE 6.6L MIL Lamp on VIN: 1GT120C84B
Service diesel exhaust fuild limited 55mph. No codes in ecm or gpcm help!!! replaced def tank due to reluctant heater code. Code has not returned sense.
2001 Oldsmobile Silhouette Premiere 3.4L No Start VIN: 1GHDX23EX1
this van was towed in with no spark. another shop had installed a ign module for the same no spark.engine ran only one day.i lab scoped crank 7x and 24x signals good.i have no spark but do have injector pulse.power and ground at module good.pulled coils from m...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Cadillac DeVille DHS 4.6L Poor Idle Quality, Surge, Cuts out, Stall VIN: 1G6KE57Y54
sadly we were not able to fix this beast... after checking and triple checking all grounds, couldnt find any bad ones but decided to add an additional ground cable from the trans bell housing to the frame just because we could out of desperation... did repla... Trouble codes: P0102 (Mass Air Flow MAF Sensor Circuit Low Frequency), P0107 (Manifold Absolute Pressure/Barometric Pressure Circuit Low Input), P0121 (Throttle Position Sensor 1 Performance), P1107 (MAP Sensor Circuit Intermittent Low Voltage).
1994 Chevrolet S10 Blazer Tahoe 4.3L First gear VIN: 1GNDT13W1R
Thanks so much to all that replied!It was mentioned that the complete electronic version of this trans. began in 1995. This is a late 94 ,so perhaps that is the reason it has this trans.Many times it was mentioned the problems caused by improper pan removal....
1999 Chevrolet Astro 4.3L mil VIN: 1GNDM19WXX
On the gear ratio in 3rd I saw 1.3 to 1. I did get it to pass inspection and reported to owner what I found. I can see in, when it's in 3rd that slip stays at 60 rpms or lower so I feel it's a converter problem. Owner will drive it like this for now.
2004 Chevrolet Trailblazer LS 4.2L Starting VIN: 1GNDT13S34
thank all of you guys the problem was the body control the flex part from the fuse box to the body control so we replace the part truck started up thank you guys again
2004 Chevrolet Aveo 1.6L No Start VIN: KL1TD52694
well this one is fixed. the whole injector pulse thing threw me for a loop but i started by checking the 5v ref at the map sensor and i had 5v. so i replaced the map sensor, i know that wasn't my starting problem but it was bad so i changed it while i was ther... Trouble codes: P2610 (Control module ignition off timer performance).
2001 Oldsmobile Aurora 3.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3GR64H51
After checking everything (injector resistance, injector pressure drop, spark plugs, compression, cylinder leakdown, fuel pressure and leakdown) I resorted to swapping coil packs (this car is direct ignition like a Saab) in and out and had the miss move from... Trouble codes: P0300.
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