possible blown plenum gasket???????
Professional
Joined: May 2008
Posts: 210
Likes: 0
From: Aurora, Ohio
The airgap is an aftermarket intake manifold that is 1-piece (stock is 2 piece, this is why it has the plenum gasket). It is available from hughesengines.com for around $600 if memory serves. Doing this will fix the plenum problem permanently, but it has a pretty hefty price tag.
Most just get the aluminum plenum plate available from the same site. Swapping to an aluminum plate corrects the reason that the plenum blows frequently on these trucks.
To further elaborate: OEM intake is 2-piece, top is AL, bottom is cast iron, the plenum gasket is in-between. These two metals expand and contract at different rates and temperatures which puts added stress on the gasket.... After a while, the gasket comes to the conclusion that living under this amount of stress is tantamount to eternal torture, at which point it commits suicide.
Most just get the aluminum plenum plate available from the same site. Swapping to an aluminum plate corrects the reason that the plenum blows frequently on these trucks.
To further elaborate: OEM intake is 2-piece, top is AL, bottom is cast iron, the plenum gasket is in-between. These two metals expand and contract at different rates and temperatures which puts added stress on the gasket.... After a while, the gasket comes to the conclusion that living under this amount of stress is tantamount to eternal torture, at which point it commits suicide.
very well put, makes complete sense now
