In August I replaced my UIM and LIM gaskets along with the UIM (including reduced stovepipe with heat shield) and the LIM itself (with the help of many people here). Not long after I started noticing a coolant smell as the engine came up to temperature, then it would go away. I couldn't find a leak under the hood and so I've been operating under the idea that my heater core had a pinhole leak and that was how I was smelling it.
This weekend (after replacing my fourth window regulator
) I found signs of the leak. Small wisps of smoke coming up from the exhaust crossover pipe- at the joint of the front header.
I believe now that the smell goes away because eventually the pipes heat up enough and seal themselves up?
From my understanding that means I have coolant getting into the combustion chamber. I can think of two ways:
1.) Blown head gasket
2.) LIM gasket not sealing
How can I diagnose this further? I used the GM aluminum framed LIM gaskets and torqued it all in sequence? I don't think I can do a head gasket by myself. I'm not sure if it'* the LIM gasket if I should do it myself since I did once and here I am again for round two.
Is there any sort of leak down or pressure check that I (or a dealer) can do to find the source of the leak? The car drives fine - no noticeable loss of power. Possibly somewhat lower gas mileage though - hard to say. I'm pushing 140k on her. (2000 SE)