Quote:
Originally Posted by barthol
BFeller. how do I check the AOS, can I just check for oil in the pipe connecting to the inlet manifold?
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“A very basic test for your AOS is while the car is running, remove the oil fill cap. If it's very hard to get off due to vacuum draw, then that could be an indication it's on it way out. There should be some vacuum draw but not excessive”
I pulled that from another thread after searching AOS Test. A bad AOS can cause idle problems due to its effect on vacumn.