Quote:
Originally Posted by MSport_Jon
Didnt work. Still have the warm start misfires.
Its looking now like it is the HPFP. I can finally manually produce the noise by activating the pump in ISTA. sounds like something is grinding in there.
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My F25 was doing this too. Not just misfiring but also "hunting" at idle when started (worse when cold). I just replaced the HPFP two days ago, now the problem is gone.
No codes either, not until the HPFP finally failed for good. For reference this is an early-ish 2011 F25 with the continental pump.