I’ve been having a lot of trouble with my van when it’s
idling at stop lights or when I’m just being stopped wile in
drive. I’m pretty sure it’s a vacuum leak so I was looking
around and noticed a vacuum hose is missing there’s two
behind the intake manifold. But there’s a third spot where
a hose goes but I don’t know where the hose is or where it
is suppost to connect to if anyone has any ideas
cap them all off except the red one or the fuel regulator next test drive the van you should see improvement is so start re attaching one by one only after a test drive this method will help you find leaking vacuum lines note if after this test nothing improved then your looking at a manifold leak
capping all inlet vacuum ports on the upper intake manifold except the red one fuel regulator disables 3 things but the engine will run just fine #1 the egr #2 ac vents switch #3 evap or vapor control unit ,if you have missing vacuum tubes some of those can cause a serious vacuum leak if ports aren't capped off ,next thing to look at are air cleaner tubes they must not have any holes in them inspect carefully next pcv valve get a new one . after vacuum problem solved get your tps sensor calibrated with rpm setting .finally check spark plugs and wires
I capped off the spot but I think it has something to do with the a/c vent switch cause the air only blows out the defrost but I don’t know exactly what it hooks up to would it hook up to the ac
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