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Prev Professional Automotive Repair Technical Discussions for July 7, 2011
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Open Help Requests for GM
Help Request Answers
1999 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J0X
thanks for any help that you can give in advance. my father a took this car apart in Jan. for head gaskets do to over heat. he attempted to put it together twice and could not get it to run so he finally brought it to my shop. i reassembled it. now i can get i...
2002 Chevrolet Express 3500 5.7L eNGINE VIN: 1GAHG39R72
Hi everyone, help me out please! This 2002 van is one in a fleet that I do regular service on for an after school program. This particular van has had a complete engine rebuild within 500 miles. When it arrived at the shop this time the complaint was that with...
2003 Chevrolet Impala 3.8L excessive idle speed VIN: 2G1WH52K63
Uggh... This Impala came in with the complaint of a sticky throttle just off idle, like so many of these 3800's have. I removed the throttle body and cleaned the bore and plate, reinstalled it and road tested. All seemed good. After the customer picked up the ...
2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13S84
This vehicle came in for SES light no driving concerns. Unit was not getting up to temp, replaced thermostat to get temp upto spec, t-stat was visibly stuck open. Tested and replaced secondary air pump shutoff valve-ok. Now the big problem we are having is tha... Trouble codes: P0128, P0132, P0172, P0455, P0410
2005 Chevrolet Trailblazer EXT LT 5.3L Cuts out VIN: 1GNET16M15
This trailblazer dies hot and will not restart until it cools off. Loss of power light sometimes lights on dash. I tested the ignition switch and replaced it for PM, problem still there. Right now it is starting and it is time to go home so I thought I would p... Trouble codes: P0443, P1516, P1682, P2101, P0689
2006 Chevrolet Cobalt LT 2.2L Loud Screeching in sound system VIN: 1G1AL55F65
This Cobalt just had the power steering electrical motor replaced at a GM dealership. May be just coincidence, but I and my customer have driven this car for over 2000 miles between us, and never had any problems. On the way home from the dealership it started...
2007 Chevrolet Suburban 1500 LTZ 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GNFK16317
Ok here we go. first of all i want to thank all of you for your time in advance. Lets start off from the beginning. At about 85,000 miles this vehicle started to have issues with predetonation (pinging). At first this was only up hill or under relatively hard ... Trouble codes: P0300, P0307
2008 Chevrolet Trailblazer 4.2L Misfire VIN: 1GNDT13S68
Thanks to all who respond. Mostly when cold under accel It misfires and then backfires out the tailpipe. Misfire monitor shows everything ok, no codes, fuel pressure is good! Any advice would be great thanks!
2004 GMC Sierra 2500 HD 6.6L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1GTHK29294
Thanks in advance for any advice you guys are willing to offer. This truck belongs to a good friend/ client of mine. It is his work truck (contractor) so he needs it back ASAP. I have searched the fix database and read through all of the notes and replies an... Trouble codes: P0202 (2 Injector Drive Fault), P2149 (Injector Positive Voltage Relay Control Circuit Group 2), P0671 (Glow Plug 1 Control Circuit)
2004 Hummer H1 6.5L Wide open throttle VIN: 137FA84374
Good morning all. I have an H1 that after driven in the heat of the day will begin to run rough and then go WIDE OPEN THROTTLE until you turn the key off. Given the severity of the problem, trying to duplicate and find the problem is a bit unnerving. So I was ... Trouble codes: P0251, P0219
1995 Oldsmobile Achieva S 2.3L MIL Lamp on VIN: 1G3NL55D7S
hate to admit it but this simple map problem has me going crazy, code 34, map low, sets as soon as key is on, checked from the back of the map plug has 5.00 volts reference, has 1.8 volts returned to computer, has good ground, cheked at cmputer has 4.79 volts,... Trouble codes: 34 (map low)
2002 Pontiac Firebird Trans Am 5.7L Clutch VIN: 2G2FV32G42
changed everything, clutch pedal doesnt come up all the way. bled the clutch system. has pedal if held down for along period of time the clutch doesnt engage into gear.

Fixes & Summaries for GM
Fix/Summary Answers
1997 Chevrolet C1500 Suburban 5.7L Temp VIN: 1GNEC16R9V
Im calling this a fix, not completaly happy my self but customer tought it was good enough. needless to say i re-did everything as far as flush changing compressor drier and orifice tube. diconected the rear evap lines blew evap and hoses, disconected condense...
1999 Chevrolet c6500 7.2L rear housing VIN: 1GBJ6H1C3X
thanks brad for the specs, i did finally confirm the nunmbers with a fax from a local dealer, worked out to be just standard bolt torque according to size. anyway it went together and so far nothing has fallen off!! thanks again.
2000 Chevrolet Express 3500 LS 5.7L Hesitation, MIL Lamp on VIN: 1GAHG39R4Y
first thanks to all that replyed. second i am sorry that i did not say that about 3 years back i replaced both upper and lower intake gaskets and new spider assembely . yes just for the sake of it i smoked it nothing . well i replaced the mass air folw sensor ... Trouble codes: P0171, P0174.
2004 Chevrolet Silverado 3500 6.6L MIL Lamp on VIN: 1GBJC34274
Thankyou for your replies to my p1093 " headache " .I had replaced a preassure relief valve because of low fuel rail preassure, and a gm diagnostic indicating there should be no fuel leaking at the fuel return line when dissconected, with the ignition 1 rela... Trouble codes: P1093.
2005 Chevrolet Silverado 2500 HD 6.6L hydo boost VIN: 1GCHK23295
i took the advice of most and replaced the unit. If it was mine, i would have tried the reseal kit.
2000 Oldsmobile Intrigue GL 3.5L Misfire, MIL Lamp on VIN: 1G3WS52H6Y
I ran some cleaner through it thinking it may be a sticking valve but it made no diference. I put the scope back on to make sure i wasnt losing an injector pulse I aso checked the ignition signals to the coil, this time it acted up with the scope on and I wa... Trouble codes: P0300.
2001 Pontiac Montana 3.4L No Start VIN: 1GMDX03E31
I wanted to thank everyone for taking the time to reply, and one person(sorry forget your name) led me in the right direction. When I checked to see if there was power( power is triggered by the PCM not ground) output at the PCM for the fuel pump relay, there... Trouble codes: P0230.
2006 Pontiac Grand Prix 3.8L pump? VIN: 2G2WP552X6
First off thanks to those members who responded. Unfortunatley the customers after market warranty will not fix the problem as the vehicle transmission performs properly and they feel there is no failure at this point. We are currently trying to get this trans...
2003 Saturn Vue 2.2L hydraulic system VIN: 5GZCZ23D43
I'm feeling very sheepish,after overlooking basics. Gene [...] was the first of several gracious replies about the location of my bleeders. I have not done this before, and I will pay attention next time. I didn't even notice calipers were upside down when I ...
2003 Saturn Vue 2.2L transmission/transaxle VIN: 5GZCZ43DX3
Thanks to all who replied. David [...] was correct with his diagnosis regarding the CVT case wear. I told customer what the problem was, gave a repair range estimate, he took the VUE to a local GM dealer who confirmed the problem as well as the cost of repair...
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