Ford, oil from valve cover to breather prob - Hot Rod Forum : Hotrodders Bulletin Board
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Old 06-11-2006, 10:48 AM
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Ford, oil from valve cover to breather prob

I've got a friend that owns a mid 90's ford f-150 with a 351. The truck has recently been filling up the intake air filter with oil from the valve cover vent tube that goes right back to the air cleaner housing. Changed pcv valve with no success. Could it be a stuck intake valve or frozen up lifter? the motor does have 150k miles on it. thanks for the help
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Old 06-11-2006, 03:47 PM
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Could be a number of items but it sounds like you PCV system may not be functioning properly. Start by making sure there is correct vacuum from the carb to the PCV valve.

I had a lot of trouble on my 460 with the PCV valve loading up with oil and then sticking. I solved this by making a small stub which raises the PCV up out of the valve cover.
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Old 06-11-2006, 06:17 PM
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Might want to clean the throttle body,the back of the throttle plate probably is full of junk ,double check the pvc and an oil change, new air cleaner if it still does it then it is time to dig deeper.
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Old 06-11-2006, 11:25 PM
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If this engine has a setup like the 5.0L where it has a lower and upper plenum and the PCV valve is located at the rear of the lower, there is a mesh filter under the valve that never gets serviced. This most likely needs to be replaced to restore the function of the system. I am not 100% sure the light truck and passenger car setup is the same.

What year truck is it?
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Old 06-12-2006, 07:30 AM
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94'. also has a miss at idle and loud engine noise like exaust leak. engine miss clears up at higher rpm.
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Old 06-12-2006, 06:24 PM
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Quote:
Originally Posted by DaSouthWon

94'. also has a miss at idle and loud engine noise like exaust leak. engine miss clears up at higher rpm.
OK. The PCV signal is sourced from the rear of the upper plenum and the draw is from the right rocker cover. You just need to verify the system is operational and not loosing vacuum draw. Check the grommet in the rocker cover for tightness. Check each hose section and coupling. If the PCV system becomes non-operational, crankcase pressure will be routed through the fresh air intake tube. If there is a vacuum leak here (or anywheres) it will cause a slight miss (too lean).

As for an exhaust noise, check the integrity of the Thermactor System one way valves. These permit forced air to be injected into the cylinder head and/or the cats. If they become burnt inside, they will allow exhaust gases back into the air pump possibly causing a fire.
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Old 03-18-2008, 08:59 AM
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I know this thread is old but these engines have a repeat pattern failure of the gasket between upper plenum and lower intake manifold sucking in and causing a miss at idle. Spray some carb spray at base of upper plenum and see if miss goes away.
If you have to replace this gasket there is a hidden bolt between two of intake runners that takes a torx bit deep in. Ether use a special tool or a standard bit on a long extension. Dale
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Old 03-18-2008, 10:57 AM
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It turned out to be a broken ring on the #8 cylinder. tore it down and started over. Found it after a compression test.
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