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Quick Question (Center Hole On Plenum)

666 views 9 replies 5 participants last post by  jam77  
#1 · (Edited)
i have a 90 5.0.. on the plenum, what does the center hole do goin from upper to lower?

is it bad to have it blocked off with a spacer?

would it cause the engine surging that im expericeing?
 
#4 ·
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ok see how the gasket has a hole in the middle between the 2 sets of 4 ports and how that spacer has that hole blocked off.. thats the one im talkin about
 
#6 ·
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theres a pic of the center hole on the lower..

there is a matching hole on the upper plenum..

if you notice on the previous pic that the spacer has that hole plugged up.. does anyone know what that center hole does?

when i took my upper intake off there was a pile of carbon sitting on that hole plug on the spacer

any thoughts?
 
#7 ·
isnt that just for the egr??
 
#8 ·
so if the egr is blocked off, would that cause the engine to surge?
 
#9 ·
I wouldn't think so I removed my egr valve and just blocked it off and i dont have any problems
 
#10 ·
I would double check the timing i had a surge issue a while ago and it turned out to be timing