Exhaust leak in valves - TCCoA Forums
 
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post #1 of 5 (permalink) Old 12-29-2016, 09:17 PM Thread Starter
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Exhaust leak in valves

96 4.6L - I just replaced my valve cover gaskets (and grommets) and there appears to be exhaust leaking into my passenger side. Driver's side looks fine. I assumed this was a sign of bad valve seals. However I realized tonight that I have been hearing an exhaust leak on that side and assumed it was the manifold gaskets. So...would that sound be the exhaust leak from bad valves seals or do I potentially have coincidental issues?
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post #2 of 5 (permalink) Old 12-29-2016, 09:49 PM
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It doesn't really work that way. The exhaust isn't under enough pressure to leak past the valve guide and seal. What did you actually see under the valve cover?

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post #3 of 5 (permalink) Old 12-30-2016, 12:30 AM Thread Starter
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Basically carbon deposit. Dark and dry. Like you would see in exhaust. There was nothing like it on the driver's side.

It does have +200k miles on it...
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post #4 of 5 (permalink) Old 12-30-2016, 08:28 AM
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Could be something like a PCV stuck open or a malfunctioning EGR/DPFE.

I assume you have no fault codes?
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post #5 of 5 (permalink) Old 12-30-2016, 12:26 PM Thread Starter
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No fault codes. I did have a fault code for low voltage on the DPFE for a while. But cleaning up the EGR system cleared that. PCV is good and Motorcraft. Replaced them fairly regularly. I've had the car for 18yrs and knew the original owner so I know its full maintenance record. I spoil it there since I am slightly abusive to it
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