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Old 10-22-2005, 18:01   #1 (permalink)
mpdsville1@yahoo.com
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'90 F150. - Air hose question

1990 F150 , 5.0 v8, 4x4 , longbox.

Bought it recently for $500. Truck has 170k miles, "Rebuilt Engine
has 65k. Rusty, but runs strong and starts immediately and doesn't
burn oil. No regrets.

Theres a hose fitting at the base of the air filter housing. Its empty.
Theres a hose fitting at the base of the oil filler cap, also empty.

I'm figuring the two go together under the general category of PCV but
dont find it in the chilton book i have. "Finger Test" shows negative
air pressure at both fittings.

Do I have it correct? WTF is this hose called co I can track/find a
replacement part?

Thanks ,
Mike D

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Old 10-22-2005, 19:01   #2 (permalink)
lugnut
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Re: '90 F150. - Air hose question

On 22 Oct 2005 16:17:51 -0700, mpdsville1@yahoo.com wrote:

>1990 F150 , 5.0 v8, 4x4 , longbox.
>
>Bought it recently for $500. Truck has 170k miles, "Rebuilt Engine
> has 65k. Rusty, but runs strong and starts immediately and doesn't
> burn oil. No regrets.
>
>Theres a hose fitting at the base of the air filter housing. Its empty.
>Theres a hose fitting at the base of the oil filler cap, also empty.
>
>I'm figuring the two go together under the general category of PCV but
> dont find it in the chilton book i have. "Finger Test" shows negative
> air pressure at both fittings.
>
>Do I have it correct? WTF is this hose called co I can track/find a
>replacement part?
>
>Thanks ,
> Mike D



It is the crankcase vent hoes. It allows the PCV to draw
clean air from the air cleaner thru the left rocker cover
into the engine where is completes the trip thru the engine.
It was originally a plastic tube connected on each end with
rubber elbows. Any light weight flexible tubing that is oil
resistant should work. If you feel a vacuum at the air
cleaner connection, you may have a choked air filter that
needs replacing.

Lugnut
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Old 10-22-2005, 20:01   #3 (permalink)
mpdsville1@yahoo.com
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Re: '90 F150. - Air hose question

Thanks Lugnut.

The vacuum at the air filter side is slight. The one at the
valve cover side is pronounced. The one at the air filter
side is on the "dirty side" of the filter though, and the filter
is new. I'll rig a pipe between the two if i cant find one
at a junk yard. ( different sizes on each end, so ill check
the yards) . I'll check the intake funnel on the front side of
the filter for stray cats, squirrils, and pinecones

Appreciate the response!

Mike D

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Old 10-22-2005, 20:01   #4 (permalink)
mpdsville1@yahoo.com
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Re: '90 F150. - Air hose question

Thanks Lugnut.

The vacuum at the air filter side is slight. The one at the
valve cover side is pronounced. The one at the air filter
side is on the "dirty side" of the filter though, and the filter
is new. I'll rig a pipe between the two if i cant find one
at a junk yard. ( different sizes on each end, so ill check
the yards) . I'll check the intake funnel on the front side of
the filter for stray cats, squirrils, and pinecones

As far as the pipe itself is concerned, is there any
hardware in there or is it a straight thru airway?
( no PCV valve type critter involved )

Appreciate the response!

Mike D

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Old 10-23-2005, 01:01   #5 (permalink)
Razorblade
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Re: '90 F150. - Air hose question

There should be a small (2" or so) clip on foam filter inside air filter
housing that the one connection is filtered through. It is just to keep
debris from entering the valve cover and potentially cause damage to the
engine. It is called a PCV filter.

Razor
<mpdsville1@yahoo.com> wrote in message
news:1130029271.951547.79290@g14g2000cwa.googlegroups.com...
> Thanks Lugnut.
>
> The vacuum at the air filter side is slight. The one at the
> valve cover side is pronounced. The one at the air filter
> side is on the "dirty side" of the filter though, and the filter
> is new. I'll rig a pipe between the two if i cant find one
> at a junk yard. ( different sizes on each end, so ill check
> the yards) . I'll check the intake funnel on the front side of
> the filter for stray cats, squirrils, and pinecones
>
> As far as the pipe itself is concerned, is there any
> hardware in there or is it a straight thru airway?
> ( no PCV valve type critter involved )
>
> Appreciate the response!
>
> Mike D
>



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