downonmonday

I have a 1995 Ford Cobra (331, vortech supercharger, Anderson Ford piping with Pro-M Airflow meter, etc). The internals I don't know a lot about because the previous owner I bought it from this past fall was Polish and new little English but had the money to get this car built up big time. Anyway, I changed the oil two weeks ago with Joe Gibbs Drive 5w/30 and K&N oil filter. I go to my buddies house for a surprise part and I was surprised instead from oil spot underneath the air filter (behind the splash guard) on the ground. I thought maybe I put too much oil, but I didn't after checking the dip stick. The car ran fine but now all of a sudden I am getting oil through the breather tube that is tied into the supercharger piping where it receives the air after the air filter. Now I take it out today and it is running like butt. Spitting stuttering and sound like misfiring after 2000 RPM. It idles fine at first, but after it gets warm it barely idles. And it still left oil behind after I put it back into the garage. Do you think this oil issue has the MAF all dirty? But at the same time the MAF is getting air from a small area that is isolated from the rest of the Anderson Ford piping. My friend owns his own mechanic shop but is in Vegas for the weekend. I am just trying to wrap my head around this. It happened all of a sudden after an oil change...that is why I am concerned. Thank you in advance!

downonmonday

BTW my AF Wideband is reading normal, if that helps on any diagnosis.

JPJP

Hey it sounds like you are running too thin an oil. Under supercharged conditions oil will get pushed past the rings easier.

I run a 50/50 mixture of 10W40 and 20W50. When I only ran 10W40 I was going through a lot of oil through the breather and I suppose consuming it as well.

5W30 is like water and you will have a mess. It sounds like you nailed the problem with a contaminated MAF from your oil. It may also contaminate your O2 sensors if the engine is consuming a lot oil for very long.

aode08

Clean the MAF with MAF sensor cleaner from the parts store, run a oil to air catch can and or check the routing of your breather lines etc and lets us know with pics of your setup.


You can improve this condition, in my situation with another car, I did not run a breather to the air filter intake. Just stuck a open filter breather on the valve cover itself and blocked the port on the air filter intake off.