Aise the car, start it while someone listen to the oil pan. I still suspect the oil pump. But it could be engine related.
A knocking sound is more mechanical than electrical,
there are electrical wires under the dash, and knocking sound. The oil pump is unerneath there.
It may be struggling when engine is cold.
If you hear the knocking sound while the air is turn off, so the problem is not coming from duckwork.
What do you mean by " increasing the vacum?"
when you give more gas?
Tuesday, November 17th, 2009 AT 1:29 AM