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993turbo · 07-23-2020, 11:46 AM

Lately my Boxster (99' 2,5) have been acting up occasionally during start from cold. It is only now and then. Not every time.

When starting from cold it starts rough. Like its running on 5 cyl. After a little while it throws the CEL. Misfire Cyl3 (P0303 Cylinder 3 misfire) or last time it happened Misfire Cyl2. (P0302 Cylinder 2 misfire). After the rough start, which lasts like 3 - 5 secs, it runs like champ.

Spark plugs are new. AOS new.

What are the likely faults? Coil packs?

07-23-2020, 11:46 AM	#1
993turbo Registered User Join Date: Jul 2020 Location: Marbella, Spain Posts: 17	Rough Start (Misfire Code) Lately my Boxster (99' 2,5) have been acting up occasionally during start from cold. It is only now and then. Not every time. When starting from cold it starts rough. Like its running on 5 cyl. After a little while it throws the CEL. Misfire Cyl3 (P0303 Cylinder 3 misfire) or last time it happened Misfire Cyl2. (P0302 Cylinder 2 misfire). After the rough start, which lasts like 3 - 5 secs, it runs like champ. Spark plugs are new. AOS new. What are the likely faults? Coil packs?