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All m20 motors have this. More. (archive)

[ Follow Ups ] [ 5-series (E34) Message Board ] [ Msg. Board FAQ ]

Posted by funfer on October 17, 2001 at 17:37:01:

In Reply to: Coolant leak in Throttle body? posted by Randy on October 17, 2001 at 12:11:32:

It is there as a heater for the TB. It acts as an air warmer for smog purposes. May also serve as a de-icer for cold climates.(?)

Anyhow the two protrusions often get crudded up and over this residue of engine coolant will corrode the aluminum. I have seen this occur at the TB as well as the thermostat housing. I have found holes where the corrosion has eaten all the way through the metal. So it could be very possible that you have a leak there...which is why the TB was bypassed. I wouldn't mess around with this thing. Before you know it a head could be cracked or warped. You may pick up a good TB at a junk yard for $20.

My son just bought a '90 525i (M20 engine) that had the two coolant hoses that should go into the throttle body connected to each other, by-passing the TB. Figuring that configuration would not pass CA smog, I hooked them back as they should be. Now the radiator is nearly empty. Why does coolant run through the throttle body and what is the fix for the leak?



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