Does the Snappy box actually control the idle? Bring it up and down? If it does, the IAC is actually doing it's job. If it is slow to react, or, doesn't always pay attention to what you are telling it to do, then replacement probably wouldn't be a bad idea. Get one from the dealer. More expensive, but, it actually works right.... More than I can say for the aftermarket fellers you get from the parts store.

 

Yeah I can control idle! But when I set it on 800 it only goes down to 860 ish, hoping not to throw a bunch of money at sensors going to try IAC though

 

IAC did not fix my issue, idled fine when cold but then once at tempature it won't idle at 800

 

What does it idle at now, when fully warmed up? What do temp, map, iat, have to say for themselves at idle?

 

IAT (V) 2.46 (C°) 53
MAP (V) 1.2
coolant (C°) 92
Upstream o2 says I'm running rich

 

Replace it. Problem (almost certainly) solved.

 

Okay here's where I'm at, it turns out I replaced the upstream o2 before, thought I did downstream oppps.

So here's the data. At running temp

Upstream o2 bounces from 0.06 to 0.84 (V)

Upstream exh. Literally as I'm watching the data goes. Rich, lean, rich, lean, rich, center, rich, lean. Seems to be random

Downstream sitting solid at 4.98 (V)
Also not idling proper sitting at 928 rpm

 

Anyone see this ?

http://www.bionicdodge.com/Download/Adjusting%20the%20idle%20for%20a%20Magnum.pdf