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Prev Professional Automotive Repair Technical Discussions for May 1, 2014
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Open Help Requests for GM
Help Request Answers
2006 Buick Rendezvous CXL 3.6L #2 cyl misfire VIN: 3G5DA03796
Only code I get is for EVAP vent P0449 need to drop tank to repair. The problem started last year but quit when we went north for 6 months, started back up in Feb when we came back to FL, the car bucks between 45 and 60 mph (1400 to 1800 rpm's) in OD only goin...
1994 Chevrolet Camaro Z28 5.7L Starter VIN: 2G1FP22P5R
Customer brought me the car and said the starter would just click and he would cycle the key untill it started,so he supplied his own used starter and I replaced it. Called me later that day and says it was the same so then he brought a new starter, again I in...
1994 Chevrolet K1500 Cheyenne 5.7L No Start, Poor Idle Quality, Surge, Stall, Misfire VIN: 1GCEK14K5R
Thank you for reading my post and taking time out of your day to help me out. This truck looks to be well taken care of but it came in because when it was started cold, all was good but as soon as it reached operating temp, it would not idle in gear. It would ... Trouble codes: 21 (Tps out of range), 23, 25 (Iat sensor out of range low-high), 44 (Oxygen sensor system lean), 33 (Map sensor out of range), 41 (Ignition control circuit), 42 (Bypass circuit fault)
1999 Chevrolet K2500 7.4L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire, Poor Fuel Economy VIN: 1GCGK24J9X
Crank NO Start. Found Ignition Module not sending signal to coil. Replaced Ignotion Module and now it would start and run. Customer Requested tune up. Cylinder 8 misfire Cylinder 4 misfire still. All 02 800-900mv puffing black smoke and during snap throttle bl...
2007 Chevrolet Suburban 1500 Z71 5.3L Misfire VIN: 3GNFK163X7
All this customer was complaining about was the Check Stabilitrack light was on. No mention of the flashing check engine light or the oil level low light being on. My Tech 2 shows a misfire on cylinder # 4 with a few misfires on cylinder #3. I decided to cha... Trouble codes: P0300 (Misfire Detected)
2006 GMC Yukon XL 1500 SLE 5.3L Steering angle VIN: 1GKFK16Z06
Hi I have this Yukon that has 2 codes in it C0472 and c0473. High and low voltage. The service stability message comes on. I looked at the voltage on the scanner and it changes when I turn the wheel. Not real familiar with this system. Any help would be greatl...
2007 GMC Savana 2500 4.8L Misfire VIN: 1GTGG25V87
We recieved vehicle from customer with misfire. We see mis fire on cyl 7 and cyl 8. It occurs under slight load at aprox 1300 to 1500 Rpm in park and can also be felt driving down the road. We have checked coils and swapped them with known good cylinders. We h... Trouble codes: P0171, P0174, P0300 (Random Misfire)
2001 Oldsmobile Aurora 3.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3GR64H51
This one runs smoothly at startup, misfires after warmup drive. Misses only on 1-3-5 bank, espescially #5. I have tried to find this problem for 3 days, no help. No engine noise. Any ideas? TIA Mike [...] Trouble codes: P0300
2007 Pontiac Grand Prix GT 3.8L ect sensor cooling fans VIN: 2G2WR55437
but all I know is when the ect is plugged up to the harness the cooling fans will not come and and overheat the car. I can command the fans on through the solus. the fans come on when the ac is turned on. they will not turn on at idle and overheat the car. onl...

Fixes & Summaries for GM
Fix/Summary Answers
2007 Chevrolet Silverado 2500 HD WT 6.6L Ecm/Injectors/Injection Pump VIN: 1GCHC29657
The injector driver located in the ECM had failed on the power side. It was only producing 10-12 volts and should have been significantly more than that. Replacing the ECM would be beginning of the fix because due to the contamination of fuel the it also needs...
2007 Chevrolet Colorado LT 3.7L ignition VIN: 1GCCS13E07
After pulling my hair for a day trying to figure out what I was missing I follow some of your suggestion of bad reprograming on new module I decided to clean the burn areas of the old bcm and hook it back and the car start it, a lot of things where not working...
1999 GMC Jimmy SL 4.3L No Start VIN: 1GKDT13W0X
Thanks for the help. Checked the return line and found no problems with it pinched it off with no change in fuel pressure. New ac deco fuel pump and the fuel pump is 55 . Thanks agin for the help
1995 Oldsmobile 88 Royale 3.8L Cuts out VIN: 1G3HN52K1S
Replaced PCM and crank sensor. Short version. We learned more about the Modus scope though. And Alibaba. Had the Modus on cam/crank power supply out of the ICM, data line via OBD breakout box, cam ref input to PCM and cam sensor itself. With the new crank sen...
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