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I don't doubt that the preheater defrosts the intake manifold much more quickly once the engine has started. My comment was that on the intial start attempt, it would have no impact.
I wouldn't think that near starts (ie. a few sporatic cylinder cumbustions) would generate enough energy to heat up the exhaust manifold enough to impact the next attempt, either, but I can't say that I've ever touched an exhaust manifold under these conditions. Either way, the preheat is obviously providing an advantage for you, so all power to you.
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David Armstrong - '86 240(350k km?), '93 940T(270k km), '89 240(parts source for others) near Toronto
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