Thread: Intake Manifold Carbon Build Up?
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Old 03-25-2012, 07:43 AM
olddog olddog is offline
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ECU is a Ford A9L EEC-4, so it is sequential, and I have verified the cam is the correct firing order for the ECU. I believe Ford puts the fuel in before the intake valve opens, so the fuel has time to vaporize sitting on top of the valve.

So you think the carbon is coming from gasoline, correct?

When I originally saw it and started this thread, I thought is was a much thicker layer than it turned out to be.
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