I dont believe there is a modulator valve on a 75 truck, and im sorry if some joker ripped you off, but Dodge transmisions are always fun, I feel for you.
where is the modulator vavle on my 1994 Mazda protege dx?
It is inside the trans, on the vavle bodyIt is inside the trans, on the vavle body
On the intake manifold, to the right (passenger side) of the Throttle Body.
It is inside the trans, on the vavle body.
the modulator is part of the transmission, more than likely you have a problem with timing. check your base timing, firing order, check your advance.
pull the pcv valve out of the vavle cover grommet, pull the hose off of it, put a new one in, put the hose back on, yay!!
Possibly the IAC ( Idle Air Control) vavle on the throttle body, or egr vavle stuck open..........would check or replace IAC first, usually not expensive.
The egr position sensor is part of the egr vavle.
Check the EGR vavle
The EGR vavle on a 6.7L is on top of the air horn on the intake on the driver side of the engine. The 5.9L does not have egr.
it is vacuum vavle controled by engine temperature. mostly used until engine gets up to normal operating temperature, or after the engine gets to normal operating temperature. depending on what is hooked up to the vavle. i hope this helps Answer your question.
on the valve cover as your faceing the car you will see a hose on the left side of the vavle cover. This hose goes to the intake plentum. the hose on the valve cover end goes to a connection that has a 19 mm nut screwed into the valve cover.loosen this nut remove the plastic cover and look in vavle cover. you will see the pcv vavle take a pair of needle nose and pull old pcv vavle out and replace.