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markk · 06-11-2002, 02:09 AM

Recently I blew my Impreza engine because of a faulty MAF (Main AirFlow) sensor. The sensor gave a low voltage, so the ECU sees less air than actually comes in, so the ECU provides less fuel, result is a lean mixture, result is knock, result is a hole in piston (turbo engines are very sensitive to knock and air/fuel mixture)

Subaru says the K&N 57i (cone style) filter is the reason why the MAF failed. Oil from the filter polluted the MAF sensor. No warrenty whatsoever.

My BoxsterS is equipped with a K&N replacement filter, fitted by the dealer. He wouldn't fit a open style (57i) filter / induction kit in the warrenty period.

I'm a bit worried now, any suggestions / experiences ?

Mark.

06-11-2002, 02:09 AM	#1
markk Registered User Join Date: Jun 2002 Location: Holland Posts: 140	K&N / oil filters and MAF sensor Recently I blew my Impreza engine because of a faulty MAF (Main AirFlow) sensor. The sensor gave a low voltage, so the ECU sees less air than actually comes in, so the ECU provides less fuel, result is a lean mixture, result is knock, result is a hole in piston (turbo engines are very sensitive to knock and air/fuel mixture) Subaru says the K&N 57i (cone style) filter is the reason why the MAF failed. Oil from the filter polluted the MAF sensor. No warrenty whatsoever. My BoxsterS is equipped with a K&N replacement filter, fitted by the dealer. He wouldn't fit a open style (57i) filter / induction kit in the warrenty period. I'm a bit worried now, any suggestions / experiences ? Mark.