bad oil pressure
#31
#33
That is way different than my truck, so I can't help you. One should be for HVAC, one for the reservoir, and that's its I think.
#34
I have no idea what you and and hey you are talking about , tearing into the engine ? but have you checked all your mounts ? I have a loose mount on my truck and when in park it makes a deep sounding knock like noise but its very intermittent and just rocking the cab back and forth it makes the same sound. I didn't even find which mount was a little loose until recently. just a thought.