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Old 08-27-2019, 11:05 AM   #1
MikeNW
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1997 SL
Default TB crud in SOHC cars

What is the source of most of the crud on the throttle body.

Is it that vent hose from the valve cover-to-air snorkel.
Or from the PCV hose.

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Old 08-27-2019, 03:07 PM   #2
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2003 L-Series 3.0L Sedan
Default Re: TB crud in SOHC cars

Crud and dirt on the exterior of throttle bodies are from either normal airflow and exhaust leak swirling around and pcv leaks to coat throttle body and engine. Any oil leaks from power steering, coolant leaks, etc, eventually coats everything and collects dirt. The interior of throttle bodies collect crud from pcv combustion byproducts recycled into the intake manifold. When the engine stops, momentum from pcv pressure doesn't come to an immediate stop resulting in coating everything behind the throttle plate in oily black crud - the combustion byproducts from the crankcase.

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Old 08-27-2019, 03:11 PM   #3
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Default Re: TB crud in SOHC cars

^^What he said.


If you want to prevent it, you run a catch can / oil separator.

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Old 08-27-2019, 04:45 PM   #4
MikeNW
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1997 SL
Default Re: TB crud in SOHC cars

I was unclear in the OP. I meant the inside of the TB.

So a catch jar + hoses (which I have) should be on the PCV circuit? Not the other breather hose.

...
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Old 08-27-2019, 05:50 PM   #5
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Default Re: TB crud in SOHC cars

https://www.lsxmag.com/tech-stories/...oil-separator/
^^how they work


You would want the can connected to both lines, so you would need a 3 port can (or just "T" the lines). Both ports on the valve cover go to the can inlets, and vacuum to the outlet port. I'd use the vacuum line on the intake manifold and just plug/cap the line on the intake snorkel.

A two port separator would works as well, you just "T" the vaccum lines together. Either way works just fine.

Something like this:


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