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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 30, 2009
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Open Help Requests for GM
Help Request Answers
1999 Chevrolet K2500 5.7L Excessive Emissions, Cuts out VIN: 1GCGK23R0X
Hello I need some input. Customer brings his truck in after installing rebuilt engine he bought truck not running. Falls on its face under load I check cam retard per request at -13 , adjusted to 0 . no help customer has replaced all fuel system including spid... Trouble codes: P0138
2006 Chevrolet Express 2500 4.8L Hesitation, Misfire, MIL Lamp on VIN: 1GCGG29V16
hi guyz need HELP on this vehicle. vehicle came in orignally with p0200 and p0300 codes and runs rough.# 7 cly show sever missfire in misfire frame around 2000 counts and rest of the clys between 4 and 26 counts.seems to get worse when after reaching operating... Trouble codes: P0200, P0300
1993 GMC K1500 Suburban 5.7L Excessive Emissions VIN: 1GDFK16K1P
I'm out of ideas on this thing. o2 sensor would not go over .5v initially, replaced o2 sensor, now have active o2 sensor .2 to .8v, found ignition timing at 23 deg advanced, retarded to 0 deg, coolant temp is reading correct at 206 deg F, map sensor is correct...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Cadillac Brougham 5.0L dies on accel VIN: 1G6DW51Y7J
Removed distributor and reinspected gear . Found Gear on Dist to be extremely worn. Could not get a gear by itself so we replaced the distributor assy. Car now runs fine . Thanks for all replies.
1999 Chevrolet Express 1500 4.3L No Start, Poor Idle Quality, Hesitation VIN: 1GCFG15W1X
Thanks to all that replied! I found that the previous shop had wired the fuel pump the wrong way... causing this new pump to fail. Replaced pump and car starts each and every time.
1999 Chevrolet Lumina 3.1L ABS module VIN: 2G1WL52M1X
After checking and double checking the wires, I couldn't find anything wrong. I took a guess at the alternator, thinking it could be interupting the signal to the abs module. Sure enough, the bearing was squeking on the alternator, so I had it rebuilt. I to...
2005 Chevrolet Cobalt 2.2L tail lamps/cluster back light VIN: 1G1AK52F45
I could not fix this one at this time. I pulled all the lights,seats and carpet followed all the seen wires.Ohm tested while wiggling harness after harness no change. Found the fuse getting hot thought the park lamp relay may be shorting out in the relay/fuse...
2005 Chevrolet Silverado 1500 5.3L wont take fuel VIN: 1GCEK19B95
wow, this one took a while to figure out. We removed tank and couldnt find any problem. blew shop air through all evap ports. replaced everything except the fuel tank and in the end thats what fixed it. baffle partially broken and not allowing fuel to enter. T...
1990 Pontiac Grand Am LE 2.5L Poor Idle Quality, Hesitation, Misfire, POPS INTAKE VIN: 1G2NE14U1L
thanx guys , what a headache, did find a bad module ground.
1998 Pontiac Grand Am SE 3.1L Oil pressure VIN: 1G2NE52M9W
Thanks so much to everyone who replied. Most of you felt the oil pump pressure relief valve was the problem, and this was enough to convince the customer to authorize some time to at least remove the pump and check it. When we removed the oil pan, we found tha...
2001 Saturn SL1 1.9L No Start, theft VIN: 1G8ZG52801
Hello all. Vehicle is finally fixed. Tech re-wired from passlock to bcm. He followed the wire diagram on SI(Service Information). Just out of curiosity I looked at one of my old Saturn manuals, and sure enough SI had wrong info. Wired as per the manual, a... Trouble codes: B2960.
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