Miata Mailing List: February 1994, Message #129
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   From: Vlad-Erik Kimsson 
Subject: Re: ISC Cleaning...
   Date: Tue, 8 Feb 1994 16:03:39 -0500

> 
> 	I took off the ISC ...  When I put it all back together it
> 	solved the problem for * a while *.  The dealer has since
> 	replaced the valve under warranty.
> 
> 	I really thought the explanation of why this happens was
> 	compelling.  Perhaps someone can suggest a way to filter or
> 	re-route the crankcase fumes to avoid this.
> 
> Sounds like an idea.  What about putting a small, in-line fuel filter
> in the rubber portion of the crankcase breather tube?  Might cause
> rough running if it clogs - although a clear filter would let you see
> accumulating crud.
> 
> I've noticed that the breather tube goes "downhill" from the cam cover
> to the throttle body.  Perhaps the hose could be elevated at one point
> - like a sink trap in reverse - to reduce the problem of crud in the
> intake.  (if that indeed is a problem)
> 
> Wonder if the new 1800cc engine layout has any changes in this area?
> 
> 
Just thought I'd let you know you responded to me instead of to the
list; easy to do, and maybe not what you'd intended, especially since
you have a great idea there...  Maybe I'll try that this weekend
(I can see the headline now:  MIATA EXPLODES, KILLING STUDENT.  PLUGGED
CRANKCASE BREATHER HOSE SUSPECTED.)

					-Dave