2000 Boxster has rough idle and these codes

[tradergarry]

Hi everyone, I'm experiencing a rough idle on my boxster. I hooked up the Durametric and I have the following codes:

P code 174

P code 62

P code 65 cyl 3 misfire

P code 63 cyl 1 misfire

P code 64 cyl 2 misfire.


I had a misfire on a single cylinder a year or more ago and it was a hairline crack in a coil-pack. Any ideas what would cause 3 cyl. to miss all at once?

I only replaced the 2 worse coil-packs last time. But its been running great until recently. I replaced the CPS which cured my hot-starting issues. The roughness seems to smooth out with increased rpm's although Its probably just less noticeable.


Any input greatly appreciated.


Thanks,


Garry

[tomc88]

I'm no expert but I had misfire on 4,
and it was my AOS that had failed

[tradergarry]

Hmm. I replaced my AOS about 2 years ago, but I'll check hoses to and from.
Thanks,
Garry