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Rusty Nuts

COOLANT LEAK INTO PLENUM STAGEA NEO N/A

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My mate called me round to look at his N/A stagea it started blowing white smoke. He swears it didn't overheat. It has the Y shaped  intake runners which stretch right over both valve covers, I removed this to make it easier to remove the igniters and plugs for a compression test. When the throttle body and runners were removed there was a large amount of coolant in the plenum. Dried this off and conducted compression test all cylinders were good. The engine idles fine and drives fine, I'm thinking IAC valve coolant chamber failure or throttle body coolant pipe failure. ANYONE come across either of these failing before. Intelligent suggestions would be much appreciated (and yes I can bypass them) i'm looking for past experiences. Thanks in advance.

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Did you bypass the coolant around it?  Does he live in a cold enough area that this will cause grumpy cold start running?

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