Wet plenum and runners
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Joined: Feb 2005
Posts: 320
From: Tampa, FL
Wet plenum and runners
I removed the plenum and runners today in order to reach my EGR to clean it and I discovered that the insides of the plenum and runners was wet. It smells a lot like gas. Last week I sprayed out the intake with carb cleaner and used seafoam as well, but I would have to imagine that it would be dry from that by now since I drove it daily. I have my suspicions on what the cause is, but I want a second opinion before I start trying to fix it.
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Joined: Jun 2005
Posts: 626
From: MN
Re: Wet plenum and runners
because carb cleaner would probably ruin a sensor or two possibly, or even eat a gasket i think, depending on the type used. I know that carb cleaner will eat the little o-rings on the end of the fuel tubes on carbs (the tube the connects the two fuel bowls)
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Joined: Feb 2005
Posts: 320
From: Tampa, FL
Re: Wet plenum and runners
Carburated engines have gaskets too so I don't think they will be a problem. As far as sensors go, the only one I can see it haveing any affect on would be the MAP sensor, assuming enough could get in there and stay long enough to do anything (It's not exactly drawing it's own vacuum or anything).
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Joined: Aug 2002
Posts: 4,676
From: Melvindale, MI, US
Re: Wet plenum and runners
only real issue with carb clean on a FI motor, is that lots of the throttle bodies have a special coating, and carb clean can remove it, but I always use carb clean, never had a problem
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Joined: Jan 2005
Posts: 162
From: Nebraska
Re: Wet plenum and runners
Originally Posted by Dave89IROC
lots of the throttle bodies have a special coating
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Joined: Apr 2005
Posts: 287
From: Boiling Springs, SC
Re: Wet plenum and runners
When you use carb cleaner in a carb the gas that flows through the carb helps burn off the excess. However the TPI engine does flow fuel through the Plenum or runners so the excess just stays in there for a long time. The air intake and trottle body cleaner evaporates faster so there is no excess. If you just used carb cleaner thats why your plenum and runner are wet and carb cleaner smells alot like gas.
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Joined: Aug 2002
Posts: 4,676
From: Melvindale, MI, US
Re: Wet plenum and runners
Originally Posted by 89_Irocz
When you use carb cleaner in a carb the gas that flows through the carb helps burn off the excess. However the TPI engine does flow fuel through the Plenum or runners so the excess just stays in there for a long time. The air intake and trottle body cleaner evaporates faster so there is no excess. If you just used carb cleaner thats why your plenum and runner are wet and carb cleaner smells alot like gas.
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Joined: Feb 2004
Posts: 747
From: Novi, MI
Re: Wet plenum and runners
91-Z28-L98 My throttle body had a special coating. It was called "carbon deposits". Your right though, the carb cleaner removed it .
...nice timing
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Joined: Dec 2004
Posts: 927
From: Queens, New York City
Re: Wet plenum and runners
Originally Posted by 91-Z28-L98
My throttle body had a special coating. It was called "carbon deposits". Your right though, the carb cleaner removed it 
.
.i agree, absolutely superb timing
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