Pelican Parts Forums - Question on Boxster Code Reading

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Can a bad AOS in a Porshe Boxster 986 result in acceleration problems? We found oil in the ventilating tube and also there is suction in the oil cap, meaning a bad AOS. We assume that it is creating a negative suction in the intake manifold that results in a lean mixture while accelerating creating hesitation and POP POPs when accelerating. If we spray starting fluid directly while accelerating it works perfect. There are no codes.

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This post was auto-generated based upon a question asked on our tech article page here: Porsche Boxster Fuel Injection Fault Code Reading / Diagnosing Problems - 986 / 987 (1997-08) - Pelican Parts Technical Article

If popping you have either a large vacuum leak or a timing issue. If the AOS diaphragm has failed, it could be your issue. Fuel trim numbers should show this, skewed with a correction for a lean condition.

- Nick