Interesting that one...happened to my girlfriends focus too.
Does anyone know why it fails since nothing moves in it. Is it reduced
sensitivity, faulty wiring caused because its on the engine and the engine
moves or what?
Indeed- the CPS is there to correctly time the sequential mode injection.
With no signal present, the ECU will run in batch fire mode where all
injectors operate together- twice per engine revolution.
In sequential mode injectors fire singlely just before the induction stroke
on each cylinder upto 4500rpm and / or 80% throttle.
After this they switch to dual sequential and fire twice per stroke per
cylinder, once on the exhaust stroke, and once just as the intake valve
opens and draws air / fuel into the cylinder. This is mainly to ensure
enough fuel is present to meet demand.
(this is correct for most Ford EEC5 ecu's.)
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