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Intake Manifold Vacuum

SethChr16

New Member
Joined
November 3, 2006
Messages
4
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0
City, State
Omaha, NE
Year, Model & Trim Level
98 XLT 4.0 SOHC w/ VIS
I have a 1998 Explorer, 4.0 SOHC with the VIS. The CEL is on but I have not checked the codes yet. I think there is too much vacuum in the intake manifold because the hoses from the manifold to the PCV valve are being sucked shut! I checked the PCV and it was moving freely but I cleaned it anyways. Thought maybe there was negative pressure because of an intake leak so I replaced both the upper and lower intake gaskets but that didn't fix it. I have cleaned the IAC and that hasn't changed anything though I have not been having any idle problems. Anybody have any ideas?
 




2000StreetRod

Staff member
Moderator
Elite Explorer
Joined
May 26, 2009
Messages
10,598
Reaction score
267
City, State
Greenville, SC
Year, Model & Trim Level
00 Sport FI, 03 Ltd V8
pressing against the firewall

I doubt that your intake manifold is experiencing excessive vacuum. My hoses were flattened and worn due to pressing against the firewall for many years: SOHC PCV Valve Mod thru 2000
 




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