Misfires and flashing CEL

[ecp]

Originally Posted by safesaxbdd

I am getting the same all of a sudden too - flashing CEL out of nowhere and misfires on 4,5,6 - HUGE plume of white smoke out of the exhaust... wonderful. engine started up really rough and lumpy - the white smoke seems bad - ecl did you have this symptom too?

When my AOS went, I had lots of oil and smoke. It ran awful. It failed in my neighborhood and ingested so much oil that it fried my cats. I’d check that first. See if you can remove the oil cap with the motor on, but try not to run it much. Let me know how that goes, happy to help.

Another thing to add, my brand new AOS failed after about two months so if it’s relatively new I’d still be curious about it.
What’s the car and mileage?

[safesaxbdd]

Could def be AOS, as that can also cause the P0456 error code I was getting intermittently over the past few months. It's smoked occasionally on startup from cold but nothing like this, this was next level. Thankfully I wasn't far from home.

I haven't opened it up to check hose fittings. The last time I had 0456 code one of the hoses was loose so easy enough. But all the misfire codes (for all cylinders) leads me to believe it's not the charcoal canister anymore...but what do I know...

The spark plugs are pretty new (2 years old max) so I'd hope it's not that. AOS seems like a likely culprit, but to your point I don't want to run the engine if I don't have to; probably just have it towed to my indie

2004 Boxster S. Mileage is 74K

[ecp]

Originally Posted by safesaxbdd

Could def be AOS, as that can also cause the P0456 error code I was getting intermittently over the past few months. It's smoked occasionally on startup from cold but nothing like this, this was next level. Thankfully I wasn't far from home.

I haven't opened it up to check hose fittings. The last time I had 0456 code one of the hoses was loose so easy enough. But all the misfire codes (for all cylinders) leads me to believe it's not the charcoal canister anymore...but what do I know...

The spark plugs are pretty new (2 years old max) so I'd hope it's not that. AOS seems like a likely culprit, but to your point I don't want to run the engine if I don't have to; probably just have it towed to my indie

2004 Boxster S. Mileage is 74K

If you had said there was no smoke I would be leaning towards a vacuum leak, but the smoke to me is either AOS or something more serious. I never got any engine lights when mine went even though it ran horribly. The quickest way to test it though is the oil cap removal. It could offer some peace of mind if it’s very difficult to remove it with the motor on

Keep me posted

[safesaxbdd]

Thanks, I don't want to run the engine cause I'm afraid it's going to brick or blow up or fry the cats.

When I first got the P0456 minor evap leak warning, I tried removing the oil cap with the motor running and it seemed to come off pretty easily. So that makes me worried it's beyond AOS, but I just don't know. Going to have it towed to local indy, fingers crossed!