intake valves
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Junior User
Joined: Jul 2004
Posts: 72
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From: nw PA
intake valves
I pulled off the intake tonite and looking down in the ports on the heads, the intake valve stems had quite a bit of carbon build up. What would cause carbon buildup down there? Is this normal? Jamie
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
The crap they call gasoline is the major contributor to your problem. Until they stop charging us $2 a gallon for the worst fuel in the history of this country we will continue to have this problem.
!["Beemer Nut"'s Avatar](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%23bc5285' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>"</text></svg>)
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
intake carbon, oil coking?
Do you have intake valve seals or umbrellas? If high miles the umbrellas are hard and in pieces in your sump. Without top end oil restrictors you may be flooding the stems besides intake fuel coking the back of the valve. Worn guides, weight of oil, plugged drain back holes from umbrella pieces? One or a combination of faults. Carl......o&o>...............
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