1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Rattle

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Old

Mar 9, 2013 | 09:58 PM

#1

UFO

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Rattle

I have a 94 F-150 5.8 . There is a loud rattle coming from behin the engine, It sounds like a valve or a solinoid opening and closing very fast. Anyone have a idea what this could be and if it is something that could cause a problem.

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Old

Mar 9, 2013 | 10:03 PM

#2

buzzy613

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From: Munger

cracked manifold or an exhaust leak some were doen the collector pipes

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Old

Mar 9, 2013 | 10:18 PM

#3

UFO

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I will try to check for that tomorrow, but it sounds more like it is right behind the intake. And it realy rattles faster than any exaust leak I've ever heard.

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Old

Mar 9, 2013 | 10:49 PM

#4

Rocky Mountain F150

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It's probably your PCV valve rattling. That is what mine is.

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Old

Mar 9, 2013 | 10:52 PM

#5

BigBlockF350

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From: VA

Quote:

Originally Posted by buzzy613

cracked manifold or an exhaust leak some were doen the collector pipes

This would be my first guess.

As already suggested, the PCV valve is a possibility too.

Good luck!

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Old

Mar 9, 2013 | 11:20 PM

#6

UFO

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If it is te PVC valve does that mean it needs replaced or is this normal?

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Old

Mar 10, 2013 | 07:57 AM

#7

buzzy613

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From: Munger

well mine doesnt rattle lol probable replace it

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Old

Mar 10, 2013 | 12:00 PM

#8

Rocky Mountain F150

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Actually....it should rattle. I've found the aftermarket one to be noisier but probably because all the junk that was clogging my original from 184,000 miles.

INSPECTION

Shake positive crankcase ventilation valve and carefully inspect for splits or cracks.
If positive crankcase ventilation valve does not rattle or is damaged, replace positive crankcase ventilation valve.

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