by Kwagon2 » Mon Mar 27, 2017 2:12 am
Hi
I also have the first generation Chrysler/Bosch throttle body fuel injection on my '85 Reliant. The IAC (which I take to mean Idle air control?) is performed by the A.I.S. motor (Automatic Idle Speed ) located right on the back of the throttle body. Throttle body repair kits are still available which will allow you to remove the A.I.S motor etc. for cleaning which is usually the problem. Using a later throttle body say from an '86 I would think would not be possible due to the numerous changes made , the critical one that I can think of is that the fuel pressure was reduced to roughly 15 psi down from 35 on the '85 So the injector and fuel pressure regulator are different. The '86 throttle body is a complete redesign with a design change being made to the TPS (throttle position sensor) and the AIS motor which is a four terminal unit , there is also an integral throttle body temp sensor to provide a new logic input to help compensate for hot starts . So I would tend to think that electronic compatibility is in question. This a small item but the '86 version is also lower in height with a new design air cleaner assembly .
I'm also not sure about intake manifold compatibility.