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Noticed oil collecting in the area above the intake manifold while fixing the knock sensor wire. Does anyone know where this oil is coming from and how to stop it? The van is a 2004 EXL.

 

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I don't think it's engine oil. More likely condensation/water mixed with junk from exhaust gasses. Mine looked similar.
 

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That is normal, nothing to worry about. Clean out the 6 EGR holes while you have the cover off.
:)
 

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its normal,, all part of the EGR system,,as mentioned earlier, clean up the carbon from the passages and gasket area and underside of cover with some carb cleaner and a brush. try to vacuum the ports as you open them up to prevent the carbon debris from getting in the engine.
 
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