oil in intake
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oil in intake
I have a 1986 f150 super cab with 178000 miles on it I get oil in the intake yet it does not smoke run hot compression is uniform that is within in 3 psi on each cylinder any ideas on what is causing this?
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OIL IN INTAKE
I have a 302 efi the oil has been a problem since about 95,000 miles the truck came with a 175 hp motor only year allowed in califorina during that time I have installed a edelbrock performer intake bbk throttle body, throttle body spacer it came with headers also put in a chip it still passes smog. my brother told me to put another pcv in the breather cap line it instantly blew my valve cover gaskets so i removed it repaired that problem and put the new pcv valve in the other side no change i have even gotten oil in the breather. thanks for your reply any more ideas would be appreciated
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on my old 86 ford i had a 302 EFI as well and i got oil in my air filter box. i know that th eoil cap has a hose coming out of the top of it and goes into the air filter box. it wasnt a big problem at first but then i noticed water getting into the oil cap and into my motor oil. anyways, i ended up totally replacing the air intake system and i got an oil cap that didnt have a hose coming from it. it ran alot better and didnt have water in the oil after that. if your talking about getting oil in your air intake system thats the only thing i have noticed conects to the air system.
Old School Hot Rodder
Joined: Feb 2006
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From: Exmore, VA
oil in intake
I have a 302 efi the oil has been a problem since about 95,000 miles the truck came with a 175 hp motor only year allowed in califorina during that time I have installed a edelbrock performer intake bbk throttle body, throttle body spacer it came with headers also put in a chip it still passes smog. my brother told me to put another pcv in the breather cap line it instantly blew my valve cover gaskets so i removed it repaired that problem and put the new pcv valve in the other side no change i have even gotten oil in the breather. thanks for your reply any more ideas would be appreciated
You should have two places the PCV system connects into the engine, one is the PCV valve, it will either go to a valve cover or a place on the back of your intake, the other is from either a breather cap or the oil filler neck. This will go directly to your breather either straight in if you have a cap like my 86 460 or to a small filter in the breather.
You should have good suction at your PCV valve with the engine running, if not check the line to the intake vacuum source. If you have good suction and your rings are good, you should have vacuum at breather cap at idle. If everything is good it will actually cause the engine to slow down it you keep it plugged.
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Joined: Dec 2007
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From: Lost
Sounds like the PCV system needs attention, unless Franklin is on the right track and it has aftermarket valve covers. Some of those have very poorly designed baffles under the breather openings......
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Old School Hot Rodder
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From: Exmore, VA
Some aftermarket valve covers don't even have baffles. I learned this the hard way on my 64 Falcon 260 V8.
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The engine has a true efi port injection. I installed aluminum ford racing valve covers as that was the only way to keep the steel valve cover gaskets from leaking oil they do have baffles I moved the breather down to in front of the fire wall to create a cool box and insulated the custum made air intake lines intake box and routed the oil cap breather line up and then down this stopped the oil from getting to the breather however the way the perfomer intake is made it holds about a 1/4 inch of oil in the low spot but does not seem to get any higher the pcv valve is located at the rear bottom of the intake I will check out the pcv valve suction as suggested thank you, James
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