Ford Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose) I prefer to work when others don't, I am here around lunch and after dinner till after midnight.
Since none of the cylinders on the passenger side are contributing but compression is fine. This means we need to see if there is no spark or no fuel injector pulse getting to those cylinders. Can you do that?
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Most test lights can not detect the ground pulse do to the style of the bulb. Do you have a noid light? If it ends up being no ground pulse then the PCM or wiring is to blame.
That leaves the PCM or wiring to the injectors for no ground pulse to those 4 injectors.
Can a fuel pressure concern cause a misfire, yes, to one complete side of the engine, not likely.
Can fuel pressure make an injector not pulse, no.
Hello again Chris here,
For an injector to work it needs constant power and a pulsing ground from the PCM. Straight wiring ground to an injector will not help. Are you missing the power or ground pulse? Have you checked the wiring? Have you checked for ground pulse right at the PCM connector?
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