High RPM power loss.. oil filler breather?

[kpack5982]

I have tried a lot of things to help get rid of my afterfire when I get from 2500 to 3000 rpm. I bumped the timing back down to 10 and even tried it a little less and that helped some but I still can't figure it out. Well I was thinking about the car maybe running too lean and thought maybe the computer trying to compensate for the extra air might be bumping up the fuel. I was looking at the stock intake that is sitting in the garage and am wondering a couple things:

1) The stock vacuum tubing runs from the underside of middle of the manifold to the outside, where it in turn runs to the pcv valve. When I put the explorer intake on, it had the part under the middle of the intake plugged so I just ran one line from the back driverside of the manifold to the pcv. Just wondering if that might have something to do with a problem as with insufficient vacuum.

2) I was thinking about the k & n breather that has been on the car and wondering if I capped it instead of leaving the breather on if that could affect the car like it has a vac leak in the high rpms or maybe unmetered air.

Any input would be great:SNSign:

 

[TENGRAM]

open element breathers=vacuum leak on efi. it is a positive closed-type ventilation system
the pcv valve must vent air to the intake for the system to work.

this is what i was told. i closed off my open breather(w/ electrical tape) and immediately noticed no difference, but results may vary.

 

[kpack5982]

tt

 

[vristang]

I am not real sure what your problem is but....

You should not have an open element breather on the oil filler neck, when the pcv is still in place. As you suspected this is essentially a vac leak, and can to odd things to the a/f mixture.
Another thing that comes to mind is egr. Have you removed yours, or is it still in place?


Tengram-
Even when the breather is replaced time should be allowed for the adaptive strategies in the computer to reset. It would be best to disconnect the battery long enough to clear out the KAM though. This may help you, or not ?

jason

 

[kpack5982]

Still have the egr, but the code of 33 has come up on the code checking and i was wondering if that may have been the problem of no vacuum to the egr. So I was going to get an oil cap and see if that helps anything out, other than that I haven't gotten around to checking the egr or the evr to see if they are still working, but then again the problem happens with wot also