Vacuum / Emissions Question

[willem445]

Originally Posted by Dead Parrot

#1 is the normal spot for the idle increase solenoid for AC equipped vehicles. Normally electric. #2 may be where the AC power connects to switch the vacuum on when the AC comp kicks on.

If it never had AC, then it may adjust idle speed when 'something' happens. No clue what that something might be.

Thanks for the reply. I think I'll try experimenting with deleting those two elements and see what happens. This truck for sure never had AC. My Dad did mention they parked this truck because of "idle issue". I wonder if it's related to that.