Question about 1988 Chevrolet K1500
I replace the idle control unit and didn't seem to help. It seems like the choke is always on, if it has one. I'm new with throttle bodies. Also, the truck will never start on the first try, fires right up on the second. I did the usual tune up plugs,wire,cap,and rotor. Any suggestion on what i should try next?
Could be the fuel pressure regulator. if too much fuel pressure it would act like the choke is on. as with all fuel injection, the pressure to the injectors vary according to the demand from the engine. It can run anywhere from 12psi to 15psi at idle to 30 psi plus when in demand for power. unplug the vacuum line from the pressure regulator while idling and see if the engine acts different. if not the regulator could be at fault. it will be a round barrel about 1.5" in diameter mounted in the return line with a small vacuum line running to it. while you have it off check the line with your finger for vacuum. mike
Posted on Jan 06, 2009
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