Can you swap in a different (4-pin) IAC?

 

Im a little confused my bad. What do you mean by swapping in a different 4 pin iac?

 

Ok, I was the one confused, and passed that along to you.

I don't think there is any good way to adapt two pin wiring, to a four pin IAC..... And it doesn't look like the two are even remotely interchangeable..... Not without some machine work, and even then, it still may not be possible... I would send the throttle body back. See if they have one that will actually fit your truck.

 

Problem is I bought it off Facebook marketplace from an individual not a company. I was thinking just machine the hole out bigger for my iac to fit ill post pics in a few

 

Note there are TWO o-rings on the new style. The old style just seats into a machined surface on the inside... and the outer O-ring is much smaller as well. Is there enough meat on the TB to blow a hole big enough for that to go into?

You may have just flushed that money down the toilet.....

Thinking about it though, I would expect they both work essentially the same way..... Your truck expects the 2 wire IAC, right? So, you only get two wires to play with? You *might* be able to split the two wires into four, just gotta pay careful attention to which wires go where.

 

The 2 wire i currently have

Old style iac

Old style
What do you think? Which wires get grouped together?

 

On the four wire version, I believe there are two circuits that move the pintle. I *think* one set is to move it in, and the other is to move it out. (just a pair of DC electric motors) PCM applies voltage to both motors to lock it in place......(and I think actually controls the grounds to move the pintle....) On the two wire, I suspect the PCM just reverses the polarity on the wires to move the pintle in/out..... Splitting the two wires into four, you are going to have power on both circuits whenever the PCM decides to move the pintle though.... and I am unsure if the four wire IAC will be real friendly with that....... Maybe use the two wires to control a pair of relays? Use the relays to control the IAC? Would likely have to experiment a bit to get it right...... Wiring diagrams simply don't give enough information to make a real declaration. Maybe test the pins with a volt meter? Test resistance across the pins, see if you can determine which circuits are which?

 

Good idea! But I'm thinking make a block off plate for the provision on throttle body make a gasket that doesn't let air pass through into intake manifold, then buy a Ford mustang iac which is also a 2 wire unit and make a little plate with hose fittings routed from the intake to iac then tap the evap purge line and send in my idle air control 🤔 I think it'll work a1 unless I'm forgetting something

 

Keep in mind, the four wire IAC just opens a port that's already machine into the throttle body. You would need to make sure you plugged all of that off completely for your idea to work. Just putting a plate over the hole that it mounts in, will leave the IAC passage wide open.....

 

made a block off plate and running it without iac for now already fabbnig up a solution for that.