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Ford's 4.6L motor discussion.
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Comments
Diagnosed the engine knock as being a bit low on oil. (My Bird has a leak.) As long as I keep an eye on my dipstick, it doesn't do that.
do a search using keyword "3.8" and you will find another couple of interesting Ford motor recalls here in Edmunds...
Your host, Bruce
The car ran fine when we test drove it, but of course, the next day it began to roar and the idle was very fast. It looks to me like there is some weird resonation going on in the black plastic air induction manifold. It has two extra chambers that look like they supply additional air to the intake when the engine needs it, like when you accelerate quickly. Has anyone else had this problem. Seems like when this weird vacuum/resonation happens, the engine either gets too much air, or not enough so that the air flow sensor is confused and raises the RPM's to compensate instead of shutting off ? Just a theory. Anyone know of a fix ?
1. Does the new gasket need any kind of sealant put on it before I stick the valve cover back on?
2. Is there anything not straightforeward about this job that might surprise me?
FWIW, yes, I'm a beginner at auto repair, but the mechainic at the ford dealer puts his pants on one leg at a time like the rest of us, and this doesn't appear to be that major of a job. I've also stripped a lawn moew engine completely down and reassembled it where it ran (OK, so an air-cooled Briggs & Stratton one cylinder flathead is a bit simpler than a V-8, liquid cooled OHC ford, but you gotta start somewhere, and the principles of operation are basically the same).
Thanks for any help.
Does your 4.6 knock only under acceleration at low RPM and does it get better with premium gas?