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Re: Carbon Buildup, was Re: question on C (neither L nor B)

To: Bob Spidell <bspidell@comcast.net>
Subject: Re: Carbon Buildup, was Re: question on C (neither L nor B)
From: Jim Juhas <james.f.juhas@snet.net>
Date: Sun, 13 Mar 2005 12:13:59 -0500
Well, that's what I always thought, but it seems that the crud I got from 
around the
throttle body was upstream of where the pcv and egr gases come in.  Does it blow
backwards up the intake?  Build up around the valves I can understand as coming 
from
that pollution stuff, but the thing I had with the Neon was right where the 
throttle
plate seats against the throttle body.

Bob Spidell wrote:

> Jim,
>
> Just got done pondering this question myself.
>
> Have concluded the "carbon"--which is downstream of the throttle plate--must
> be coming from various vacuum inputs to the intake manifold, probably 90% or
> more from the PCV valve (whose job it is to allow crankcase blowby to be 
>sucked
> into the intake manifold ... hence the carbon buildup).
>
> bs
> ********************************************
> Bob Spidell         San Jose, CA        bspidell@comcast.net
> '67 Austin-Healey 3000             '56 Austin-Healey 100M
> ********************************************
>
> Subject: Carbon Buildup, was Re: question on C (neither L nor B)
>
> >
> > Where does the intake side carbon build up come from?  I recently addressed 
>a
> > carbon build up problem on our 1998 Dodge Neon R/T with the 2.0 DOHC engine.
> > The throttle plate was sticking after being parked for a while.  I cleaned 
>a ton
> > of black soot from the throttle body.






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