LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Weird lookin stuff in top of throttle body

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Old Sep 29, 2010 | 08:12 PM
  #1  
d2stephen's Avatar
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From: Vero Beach, FL.
Weird lookin stuff in top of throttle body

My car has still been running weird, for those of you who have seen my other threads and have helped me out the whole time. I decided to do everything I havnt, check wires, check plugs/plug gaps, clean everything possible to clean, basically everything I can do to maybe fix my misfire/hesitation problem.

I took the top of my throttle body off, and found this weird looking gunk in it and also all in my PCV hose.

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How the heck could this get to this point??? Does this mean there's moisture in my oil? Smells of gas also, but I'm pretty sure this is normal.
Old Sep 29, 2010 | 09:30 PM
  #2  
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If you have lots of miles, then that is fairly normal, but a bit on the heavy side. Still, it's not much to worry about. The oil you're seeing is coming from the fresh air supply hose from the throttle body during times when the PCV valve can't keep up with manifold vacuum. There will always be moisture in the crankcase looking for a place to get out.
Old Sep 29, 2010 | 09:55 PM
  #3  
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Oil from the PCV valve mixing with cooler air from the atmosphere.... nothing to worry about. Unless your oil is milky looking, then worry.
Old Sep 29, 2010 | 11:08 PM
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Ok good, I'm glad its nothing to worry about. Last time I looked at it, there were oil deposits, but looked nothing like this, and not this light in color either. Thanks for easing my mind!
Old Sep 30, 2010 | 03:05 AM
  #5  
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From: Ocala, Florida
I'm not sure what problems you are chasing down but excessive moisture in the oil can be a sign of a bad head gasket. And since your in florida the oil should be getting hot enough to evaporate any moisture. The only time I saw any of that was right before my motor hydro locked on coolant.
Old Sep 30, 2010 | 05:21 AM
  #6  
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Normally, vacuum at the PCV valve on the driver's side of the intake manifold pulls fresh air through the crankcase, to remove the normal blowby vapor. The air is supplied through a port in the TB, in front of the blades, through the chamber in the top, down the hose to the passenger valve cover, down through the crankcase and up through the lifter valley. Check the PCV valve to make sure its not plugged up.

When the valve is plugged or you have excessive ring blowby, you get oil in the top of the throttle body. The pressure in the crankcase has nowhere to go, except to reverse flow, and blow through the air supply system, picking up oil mist as it blows through the valve cover. Some oil in the top of the TB is "normal", particularly if you spend a lot of time at WOT, where there is no intake manifold vacuum. But you have a LOT of oil in there.

The water also indicates heavy blowby. The blowby gasses are mainly combustion products, which contains a lot of water vapor. The fact you have so much in the top of the TB would also indicate excessive blowby. Or, you often run your engine, without allowing it to fully warm up, causing the water in the blowby gasses to condense on cooler parts of the engine.

First, check the PCV valve. Then with engine idling, pull the oil fill cap off, and feel/listen for air puffing out of the fill tube. That would confirm the blowby problem... = worn rings.
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