dave priddy
Newbie
hey guys, bear with me. i am new at this truck stuff. i"ve got an "88 gnc sierra sle, two door standard cab, stepside short bed. it was originally 305ci, th400, 3.42 posi 10 bolt. now it has gm crate 350ci, with about 60,000 miles on this engine. there is 200,000 miles on truck. trans is rebuilt and so is the rear end,as well the suspension. the trouble i am having is with it flooding. i had a mechanic friend check it out. when you start it in the morning, you can just smell the gas when it idles. it is fouling plugs. my mechanic friend checked the tbi and it was good, the fuel pressure regulator was providing the correct pressure to the tbi. the injectors were putting out a good spray pattern and he checked the o2 sensor with another one and both of them were not reading correctly. his words were "they were all over the map". also, do not have any codes from obd1 port. he does not have any obd1 diagnostics equipment anymore. he put in new plugs and is running good but you can still smell the gas like it is still getting too much fuel. i replaced the plugs about 8 months ago they were fouled too. i am at loss. i honestly don't have any ideas. but, i was wondering if all the other stuff he checked out is kosher, could it be the truck's pcm or controller or maybe the **** or eprom that is getting screwy? i apologize for this being long winded, but i'm lost on this. any information or suggestions you could provide would be greatly appreciated. thanks.
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