I have a 1998 chevrolet K1500 5.7 L vortec mpi reg cab 4wd 120,000 miles.
I have 60 fuel pressure with key on and 50 fuel pressure when truck is running at the
port at the top of motor behind the spider injection. I get 1 pint of fuel in 7 seconds
using stop watch on my smart phone. I was able to drive my truck around my lot up
and down hills and back up into my garage while someone sat under the hood spraying
starting fluid into throttle body. I put 3 different 1/2 bottles fuel injection cleaner into a
little more than 1/4 of a tank of gas. I sprayed crc, gumout,and valvoline throttle body
cleaner into the throttle body. the truck will start once in a while on its own now, but
only runs 4 a few seconds. most of the time it cranks strong, starts, and stalls
immediately. can someone tell me how to diagnose the problem or tell me how to fix
what makes the injectors pulse? thats the key as you proved this with your tests belive it or not! with study you may find a crank or cam sensor is the problem , my first would be a crank sensor guess.
Could b u need pull motor replace rings dbl check pressure on fuel pump. Injector cleaner won't do it. Spider may b bad.
If spider no good it will fry the rings. Check 02 sensors also
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