30 Second Test to Identify Bad Lower Intake Gasket

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Posted to Technical Tips Forum on 1/30/2007 1 Reply

I had a 99 GMC Suburban in the other day. It turns out it had bad lower intake gaskets allowing oil and coolant in the intake runners.

Notice the coolant and oil mix on the right side [1999 GMC Suburban K1500, N/A Photo].

By just removing the PCV valve I n... Login to read more.

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