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.
~Paul
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
>> dmscheidt@gmail.com
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