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01-25-12, 09:31 AM

#61

dgsx1997

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Yeah, good point about the upper side of the exhaust valves.

It's possible that this could be a standard interval maintenance on the IS250 to avoid major problems.

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01-25-12, 09:46 AM

#62

Kurtz

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Quote:

Originally Posted by hades281

I would not expect Seafoam to do anything for exhaust valves, really. Then again, I have not heard of any complaints about carbon buildup on exhaust valves. Only intake valves.

This.

The reason the 250 has the problem and the 350 does not is that fuel does not touch the top of the intake valves on the 250 but it does on the 350.

The fuel keeps the intake valves clean on the 350.

The exhaust valves don't enter into it.