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Pulling the Plenum on 2004 Xterra. What should I do while I'm in there?

3K views 11 replies 6 participants last post by  hammer02scx 
#1 ·
I am about to perform surgery on my 2004 X with 125k miles. I plan to remove the plenum and:

1. Change plug #6
2. Change the drivers side valve cover gasket
3. Replace the intake manifold gasket to stop a years-old coolant leak

While I'm in there, what else should I change, replace or fix? I read the knock sensor should be done (not exactly sure what that is but it seems important) but what else should I do since I don't remove the plenum every day?!?

Thanks..
 
#7 ·
Hoses

I'm planning to do this job over the thanksgiving break when my daughter and her xterra are home from college. So, I haven't completed it. But, I went to the gates hoses website and entered my VIN to find the hoses that fit. I have studied the engine, FSM diagrams, and videos of this repair and have ordered the following from Amazon: Gates part numbers 18460, 18461, 18462, 22518, & 28410. I think this should allow me to replace all of the coolant hoses except the ones that would be easily accessible with the intake on.
 
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