986 boxster missing when wet

[T_Pot]

anyone have any ideas why my 2000 2.7 boxster is missing when its wet?

ive changed all 6 coil packs and its still doing it. its ok in dry or damp, but when its wet it misses quite a bit, enough to throw the engine light on, but clears after 4k revs

[Pope]

Its common for water to enter the inlet tract on early Boxsters due to the position and design of the air intake / airbox, once it gets in it interferes with the MAF sensor.

Has the car got a standard air filter set-up?

Try running the car with the MAF disconnected if the misfiring stops then you know where to start looking.

A check on a PIWIS tester might be in order.

[T_Pot]

It's got standard airbox but I believe it's been de snorkeld ?

How would I sort this issue pope ? Thanks for the reply though mate. Appreciated

[Pope]

Confirm the issue is MAF related - essentially disconnect it and run the engine without the adaptation afforded by the MAF sensor system.

If it is so; you may have to reinstall the snorkel parts - they were designed to separate the air from debris/water which would impair running - the intake was redesigned in 1997 after cars were found to be suffering with the same symptoms you describe and a kit was available; I'll PM you the TI if it helps?

With the crap summer we're having you'll not have to check it for long!!