oily air filter
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New User
Joined: Mar 2002
Posts: 7
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From: Fayetteville
oily air filter
I have a 1990 Bronc XLT 302 and my air filter is constantly getting soaked with oil. The air tube from my valve cover to my filter assembly drips with oil sometimes. What can i do to correct the problem?
'preciate the help
'preciate the help
Posting Guru
Joined: Aug 2001
Posts: 1,113
Likes: 2
oily air filter
I'd replace the pcv valve,the air tube,and the air filter.You also might want to replace the breather filter located in the factory airbox,and wipe the excess oil that is in the airbox out with some rags.I have a 1990 Bronco with the EFI302,and I had the same problem,but I changed all of the parts listed,and in my case solved the problem.Start simple first,it might just be that the air tube is clogged and/or the pcv valve is shot.The air filter Ford # number is FA-1046&crankcase emission fliter is Ford part # FA-1047.I forget what part # for 302's pcv valve& for the air tube,but you should be able to cross reference all these parts with popular aftermarket part #s.The whole job of replacing this stuff was like 20-30 minutes,and the cost wasn't that much. I'd try that first.
Thread Starter
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New User
Joined: Mar 2002
Posts: 7
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From: Fayetteville
oily air filter
hey guys thanks for the advice
but i have a question about the pcv valve.
On mine it is on the left valve cover going into the upper intake manifold.
i dont have a second pcv valve going from my right valve cover going into air filter unit.
is it supposed to be that way?
i have a 1990 302 EFI
Thanks again
Adam
but i have a question about the pcv valve.
On mine it is on the left valve cover going into the upper intake manifold.
i dont have a second pcv valve going from my right valve cover going into air filter unit.
is it supposed to be that way?
i have a 1990 302 EFI
Thanks again
Adam
Junior User
Joined: Jun 2001
Posts: 69
Likes: 0
From: Florida
oily air filter
Had a similar problem with my '88 Bronco with a 5.8L engine. The standard paper crankcase filter located on the lower right side of the air filter housing would become saturated with engine oil after a few weeks. While at a Walmart's, I noticed an alternate style crankcase filter (has an orange colored hard plastic housing) apparently designed for a later model. Decided to try it ... had to drill out the opening in the plastic L shaped connector some, plus I drilled six 5/16" holes in the top of the plastic housing to allow more air flow. This modification has kept the primary air filter oil free for a couple of months now. Hope this helps ... John
Junior User
Joined: Sep 2001
Posts: 84
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From: Round Rock USA
oily air filter
The PCV valve is on the pass side, The oil filler cap has a hose that goes to your aircleaner box. After you do the above suggestions, all good ones BTW. If that doesn't fix the problem, do a compression test and vacuum test. Excessive blowby will cause the same problem. If it is excessive crancase pressure caused by blowby, be prepared to get down and dirty with your engine. Mine was doing that just before 200K miles. It was time for an overhaul. 
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Thread Starter
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New User
Joined: Mar 2002
Posts: 7
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From: Fayetteville
oily air filter
hey guys thanks
i just hit 150k
she runs strong and doesnt leak except for that
so ill check it out and hope for the best.
Thanks
i just hit 150k
she runs strong and doesnt leak except for that
so ill check it out and hope for the best.
Thanks
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Senior User
Joined: Mar 2002
Posts: 450
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From: Charter Oak, Iowa
oily air filter
Same problem on my 1989 5.0L. 130,000 mi. Engine was just plain tired and excessive blowby. Truck now in my shop with engine in 1000 pieces waiting for the machinist to give me back my block. (4 weeks) For your sake I hope the PCV is the problem but don't hold your breath.
Randy
Randy
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Joined: Mar 2002
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oily air filter
My '92, 5.0, was doing the same thing. A PCV valve would be a nice fix, but it was blowby in my truck, and it wasn't cheap to fix either! One of the cylinders had about 20 psi; the rest were fine. Take about an hour and check the compression. That should give you some insight. Good luck.
