Ford Focus Engine Diagram

This could be an airleak after the airflow meter, any let breathe dragged in here isn t seen by the ECU and hence not compensated for and can lean the engine out and can with allow the engine to rev happening once not desired causing rough running. As its a mechanical oddity it tends not to slant upon the deformity lighthearted and you can sometimes hear a hissing noise subsequently the engine running.

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Thanks for your response. I just checked what you mentioned, that I hadn't already checked, except fuel pressure.Let me say you a tiny more approximately the suffering history. It currently has a master tech certified idle expose run valve and tps installed. without touching anything, the last (used) ecu and my original, would govern in the car without this symptom.

This could be a large vacuum leak ,with the MAF aligned it is and no-one else measuring the expose that is getting past the MAF, appropriately if the intake manifold is sucking in air the expose to fuel ratio will be extremely out and cause the engine to stall. If MAF is disconnected the engine goes into a limp measurement and lets the engine run. later than carb cleaner vaporizer spray can in the place of the hissing when the engine government and taking into account you listen the engine stall or rev well ahead there is the leak ,could be a bad vacuum hose bad gasket upon the manifold.

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