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4KQ Runs then Dies?!?
My lovable '84 4KQ has developed another glitch. Does this sound
familiar to anyone?
It runs great when you start it cold, engine/idle is very smooth and
everything copasetic. As the engine heats up, it develops a gradual miss
that degenerates into severe bucking and finally an inablilty to pull
any more than 1/8" of throttle without missing completly (which makes it
about as fast as a Big-Wheel). Finally it dies and wont start at all
until it cools down completly. The fuel pump is whining like a thing
posessed at this point.
I have a hunch that the car isn't getting enough fuel pressure from the
get-go, but as the engine gets hot it begins to manifest itself as vapor
lock somewhere in the FI system. It has a new fuel filter and the pump
seems sound, at least when you first start the car. Could it be the fuel
pressure accumulator is bad? The thing is the original on the car and is
quite badly rusted. The car is CIS-E with an ISV and electronic
differential pressure control on the fuel distributor.
Thanks for any input. I just got the electrical gremlins at bay and now