Oil problem I-6 4.0

Big Island Bump · #1 (**permalink**) 03-26-2007, 01:50 AM

My air filter tube and K&N filter are getting oil in them. I have tried blowing out the line from the PCV valve and if this works it is only for a short time. if the line clogs does the oil get sucked in from the vent at the front of the valve cover? I want to install an AEM that I picked up for it but would like to solve this problem first. Any help would be appreciated.

Bounty__Hunter · #2 (**permalink**) 03-27-2007, 10:00 AM

Find the tube from the airbox to the valve cover, pull it off at the airbox end. Does this tube have vacuum, sucking into the valve cover?

Big Island Bump · #3 (**permalink**) 03-28-2007, 09:07 AM

Bounty Hunter,
Don't know! I will check it out today and get back to you. Thanks for the reply

Big Island Bump · #4 (**permalink**) 03-28-2007, 09:45 AM

Bounty Hunter,
Yes there is good suction from this tube, I also cleared the line from the PCV to the intake. I don't know if it makes any differance but I have removed the stock airbox and put a K&N filter directly on the air intake tube.

redrooster · #5 (**permalink**) 03-28-2007, 09:50 AM

Not the 4.0 liter expert, but my 93 Grand did that the whole time I owned it. I have also heard alot of others with the same issue. I think it is just natural to that engine, but you could change the PCV valve and see if that helps.

Joopin · #6 (**permalink**) 03-28-2007, 11:53 AM

Mine does the same thing, it sucks. That little 1/8" hose gets clogged very easily with oil.