Air plenum gasket

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Mar 14, 2006 | 05:11 PM

Trailcat

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Joined: Sep 2005

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Air plenum gasket

Had a fun day of trying to replace a valve cover gasket, put the air plenum back on, started it up and it idled like I had it floored. Replaced the air plenum gasket and it idles close to the same, but now I have no power it seems. I have to floor it almost to get any power from the motor. Would this still be from a leak somehow? Its on a 93 F-150 with a the 5spd.

Last edited by Trailcat; Mar 14, 2006 at 05:15 PM.

Mar 15, 2006 | 12:23 PM

optikal illushun

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Joined: Mar 2002

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From: Coal Region

all the vacuum lines hooked up right on the tree? also did u replace the throttle body gasket and is the cables free and easy to move?

Mar 15, 2006 | 05:16 PM

rhetor

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From: redding U.S.A.

You sure you connected the PCV vacuum hose back? It is on the bottom side of the plenum and goes to the pcv on the back of the valve cover. Easy to forget, as its difficult to see.

I would have to agree with optikal, most likely a severe vacuum leak.

Mar 16, 2006 | 07:24 PM

924x2150

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From: Langhorne, PA

Me three! Busted plastic vac line. The plenum is hard to screw up.
A hand-operated vac-pump kit with gauge might help you find out where the leak is.
Edit I wonder is the truck almost OK? I wonder if the computer is still in shock from the original "over-revving" condition.
There is a chance that maybe it needs to be cleared by re-setting the CPU and let the engine find its correct mix. Kill the power for a few minutes and reset the computer.
Or pull the codes first, then reset the computer.

Last edited by 924x2150; Mar 16, 2006 at 07:29 PM.