Lower intake gaskets - 4.0 OHV | Ford Explorer - Ford Ranger Forums - Serious Explorations
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Lower intake gaskets - 4.0 OHV

masospaghetti

Elite Explorer
Joined
October 22, 2006
Messages
1,526
Reaction score
158
City, State
Huntington Beach, CA
Year, Model & Trim Level
98 XLT, OHV, 4D, 4x4, 5M
Working on curing three CEL's - EGR insufficient flow and P0171 and P0174 (lean banks 1 and 2) condition. I found the culprit for the EGR code. The DPFE leads for the hoses were broken apart, brittle from the heat I assume. Questions for ya'll:

1. I know the upper plenum gaskets can cause this, but how about the lower plenum gaskets, or even the lower intake manifold gaskets? Should all of them be replaced?

2. Anything else I should do while I have things apart? I just bought this truck, and I want it to last a long time. Cam synchronizer? Fuel pressure regulator?

3. How does the EGR tube remove from the plenum? I would like to replace that O-ring in there.

thanks all - 98 Explorer XLT, 5-speed. 200k miles.
 






swetrid

Explorer Addict
Joined
September 30, 2010
Messages
1,888
Reaction score
7
City, State
Reading Pa
Year, Model & Trim Level
1999 Eddie Bauer
There are fuel rail gaskets between upper and lower intake that get sucked in and cause lean codes also.
 






rocket22

Well-Known Member
Joined
August 28, 2007
Messages
204
Reaction score
1
City, State
La Grange, IL
Year, Model & Trim Level
2002 Explorer xlt 4 wd
fel pro gasket kit

will have the gaskets for all, (I didnt open my fuel rail). My EGR tube basically rusted away, so be careful when disconnecting and moving. I put a polug in the EGR tube and truck runs fine!
 






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