[soundquest]

Will be undertaking replacement (front and rear) of my valve covers gaskets (both are leaking) -- I am wondering what else is opportunistically convenient and smart to service while I am in there. Knock sensors? Spark plugs were replaced at 100K (it's at 137K currently). Thanks.

 

[soundquest]

BUMP. Anyone? No takers?

 

[BMR]

What year, which engine?

If it’s the earlier 3MZ-FE V6, replace the PCV valve and grommet in the rear cover. The knock sensors are under the intake manifold, which would be a deeper dive. There’s also a coolant bypass hose under the manifold that would be good to replace.

If it’s the later 2GR-FE, I don’t know much about that engine.

 

[soundquest]

It is the 2008. That is the 3.5 correct? The later model?

 

[BMR]

Yeah, according to the wiki article on the Sienna, it got the later V6 in 2007.

 

[gregee]

If it were mine, I'd replace the spark plugs again while in there. Easy gain of ~40,000 miles before having to do those again.

Greg