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Leaking valve cover gaskets affect mpg?

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Old 07-14-2011, 06:16 PM   #1
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Leaking valve cover gaskets affect mpg?

Anyone know if leaking valve cover gaskets on a 5vzfe affect mpg. Would this affect the vacuum on the motor, thus the fuel atomization in the engine? I recently replaced leaking intake manifold gaskets and valve cover gaskets on my tahoe and it made an improvement.
Not sure how this motor works with its pcv valve system. I was not able to locate the pcv valve to test.
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Old 07-15-2011, 07:52 AM   #2
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PCV valve should be easy to find- on the valve cover.

Also, get a socket and snug up your valve cover bolts. Thats what I did on mine when I bought it, and the leaking stopped.
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Old 07-15-2011, 07:57 AM   #3
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PCV is located on the back of the valve cover. Snug the valve cover bolts lightly, you don't want to break one off. This will stop the leaking.
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