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

To: Shop-Talk <>
Subject: Re: Carbon Buildup, was Re: question on C (neither L nor B)
From: Paul Parkanzky <>
Date: Sun, 13 Mar 2005 22:08:27 -0500
One great example of this is on VW TDI's.  I've seen a TDI intake 
manifold that was ~2" stock restricted down to ~3/4" because it was 
full of carbon.  In the TDI case basically soot from the combustion 
process (smoke) ends up in the engine bay and is sucked into the 
intake.  A little oil vapor is also pulled into the intake and coats 
the inside of the manifold, so the tiny soot particles stick.  Diesel 
motors smoke quite a bit more than their gasser counterparts, which is 
why the problem is so pronounced in the TDI.


On Mar 13, 2005, at 10:06 AM, Jim Juhas wrote:

> 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.  And I have seen this build up 
> on other
> cars as well, including the Ford 5.0L engine I'm working on.  Where, 
> exactly,
> does this stuff come from?
>> In addition to the things others have mentioned, Toyotas of this era
>> had some problems with intake system carbon buildup.  It typically
>> caused problems with the engine hot -- the gunk expanded enough to
>> keep valves from sealing properly.  I'd try some aggresive fuel system
>> cleaner.
>> --
>> David Scheidt

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