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Originally Posted by KCPowerStroker
I was thinking that the SCT would "lock" the valve closed thus no hot exhaust gases going through the cooler or atleast not into the intake. Am I wrong?
Yes and no, by turning off the EGR valve it prevents the valve from opening, but there are two things. If the spring in the valve is weak then there is a chance of the valve blowing open under boost conditions, and the other is if you take a look at a EGR valve, it has two valves to seat. Usually the bottom valve doesn't seat all the way leaving about .002"-.005" gap at the seat that can let coolant enter the intake, thus taking a chance of lifting the head when the piston try's to compress the liquid.
2004 F350 CC DRW King Ranch
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