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Prev Professional Automotive Repair Technical Discussions for April 5, 2011
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Open Help Requests for GM
Help Request Answers
1997 Buick LeSabre Custom 3.8L Misfire VIN: 1G4HP52K1V
we have a 97 buick le sab, that is runing poor,is mising under load, we check the cat and looks like is ok,the only code tha i get is po300, plug, wires are good, fuelpump is new, fuel filter,new coils, new modul,i just dont know what is nex, on my scan tool t... Trouble codes: P0300
1995 Chevrolet C1500 Silverado 5.0L vent mode VIN: 2GCEC19HXS
I have this 95 Chev. p.u. with a bad air door actuator, won't switch from floor to vents. I found that the gear was stripped in the motor.My tech must have installed it wrong, he decided to take it apart, now we seem to have a bigger problem, won't work at all...
1999 Chevrolet Silverado 1500 4.8L lines VIN: 2GCEK19V2X
The owner's son replaced the brake lines to the ABS unit. Now only the right front brake is working, the pedal is high and hard. We have change several of these lines, but we have never made a cheat sheet of what line goes where. Has anyone written this inform...
2002 Chevrolet Trailblazer LS 4.2L a/c VIN: 1GNDS13S42
good day everyone, i have a 02 trailblazer with the a/c inop. the outside temp on control panel is stuck at -32. on my scanner the outside temp raw is 57 and the out temp filter is - 32 . question is the out temp filter a filtered reading from hvac module or c...
2003 Chevrolet Trailblazer LT 4.2L MIL Lamp on VIN: 1GNDT13S23
I originally got this one in for a P1481 which was a fan speed loss of signal code. So I replaced the fan clutch and there is now a fan speed signal to the PCM. But now I have this P0128 code. It does have a new thermostat that is about 3 months old or so. Sit... Trouble codes: P0128 (Coolant temperature below thermostat regulating temp)
2004 Chevrolet Tahoe LS 5.3L reverse VIN: 1GNEK45ZT4
We have a 04 chevy tahoe 4x4 vin z 5.3 that has no reverse. When cold, it had no reverse until I raised tapped accelerator and rpm got to 2,000 and reverse engaged. As transmission reached normal operating temp, I would raise rpm to 3800 in reverse with no mov...
2001 GMC Savana 3500 5.7L Abs Module VIN: 1GDHG31R91
Commercial van will flash the ABS lamp on when switching blower fan speeds- stays lit for brief periods of time. The only code that comes up is in the engine controller-U1041- loss of EBCM communication. No codes are stored in the ABS module. I found several b...
2007 GMC Yukon SLT 5.3L not working VIN: 1GKFC13097
After recieving the vehicle I found that the air bag light was on. Tested system and found bad clock spring. After replacing clock spring the was no more air bag light but the cruise control is still not working. With limited info on alldata I am trying my bes...
1995 Oldsmobile Achieva S 3.1L shift into reverse from park VIN: 1G3NL55M5S
Hey there all. Thanks in advance for the help. The woman's concern is that when the vehicle is first put into reverse from park, it will shift very hard. It does this when it is shifted into drive too, not exactly as severe, but pretty hard. The vehicle drives...
1998 Oldsmobile Intrigue 3.8L Excessive Emissions, No Start, Misfire, MIL Lamp on, Floods VIN: 1G3WH52KOW
First of all thanks for taking the time to read this. I have a strang one here. Car came in on the hook, owner stated car started running rough, and stalled. She attempted to restart it and said that a lot of white smoke came out of the exhaust. I checked for ... Trouble codes: P0300 (Ramdom missfire)

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Regal LS 3.8L high idle VIN: 2G4WB55K62
thank you to all the technicieans who offered me help!! it was appreciated greatly, and as much as i would like to post more info on my problem car i cannot becasue the customer who has stopped by twice to have other stuff fixed has not helped me out by leavin...
2005 Cadillac CTS 3.6L No Start VIN: 1G6DP56715
It looks like the vehicle was actually 2.5 quarts low and that was after the customer added a quart at home.This six quart system was down to 2.5 quarts total. I can't prove it but it appears to me that when the oil pressure starts to drop, the first thing to ...
1998 Chevrolet C1500 Silverado 5.7L Master Cylinder VIN: 2GCEC19R9W
Thanks for all the great advice, replaced faulty store brand master with wagner unit. Pedal was better but still sticking once in awhile. brakes needed replace on front so installed wagner loaded calipers and new hoses as a precaution. Checked rear brakes ...
1999 Chevrolet Cavalier 2.2L Ratio Error VIN: 1G1JC5245X
Thanks to Norman for helping to answer my question. The correct sprocket count was 32/38 and it took a final drive with a 38 tooth sungear. I suspect the trans had been replaced due to an accident of some kind as the Engine Oil Pan was also crushed and had ...
2000 Chevrolet C-Series Kodiak C7H042 7.4L No Start VIN: 1GDL7H1D4Y
Well this one is out of the shop, turns out that the rebuilt engine that was installed had the wrong timing gear set installed causing the reluctor ring to be located to far forward causing the crank sensor not to read properly. This was not easy to see with o... Trouble codes: P0335.
2000 Chevrolet Astro LS 4.3L Misfire VIN: 1GNDM19W51
thanks to all the replies, this one is fix i find the problem,is was the new valve, it was hier by like 20.000s then normal,we just cut the top and tha fix the problem, hope this help any one there we the same problem, since now on we going to chek the valves ...
2003 Chevrolet Silverado 3500 LT 6.6L engine vibration VIN: 1GCJK33143
The customer took it to a chevrolet dealer and had the compression checked. Cylinder # 8 had low compresion. Customer is living with the vibration. It is most noticable at idle, and not very noticable at higer RPM.
2005 Chevrolet Equinox LT 3.4L Mechanical VIN: 2CNDL63FX5
This is/has been a very difficult problem to diagnose and I believe a very uncommon problem. The vehicle was connected to a Snap-On Modis scanner and driven extensively, but the problem failed to return. There were no codes or history set according to the Modi...
2008 Chevrolet Suburban 1500 LT 5.3L Door lock, Radio VIN: 3GNFK16338
Thanks for all the replies. We did the BCM replacement & program as requested by the other shop and they repaired the rest of the problems. This one had more than one issue. The speaker issue was someone had been in the doors and moved the wires to the spe...
2003 Pontiac Grand Prix GT 3.8L Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G2WP52K83
PLUGGED CAT CAUSED ALL THE PROBLEMS. Thanks to all who responded to this posting - the response is phenomenal from this organization. The original posting by our Mech was not as detailed as I would like, so I pasted an email I sent to a colleague prior ... Trouble codes: P0300.
2007 Pontiac G6 GT 3.5L brake light VIN: 1G2ZH58N87
after doing futher research there is a re calibration that has to be done after replacing the bpps sensor as i did not have a can adpt for my tech 2 i brought it to a gm dealer recalibrated the bpps sensor customer picked up car 2 hrs later brake lights stay...
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