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XfireZ51 · 06-09-2012

Merlot,

The LT-5 ICM is unique to this motor. It uses a very similar 14 pin connector however it is quite a bit different from other ICM. Viewing the circuitry, you can think of the DIS as a co-ECM. The base of the LT-5 ECM is the L98. Remember, the L98 ran w 1 coil and a distributor. So something else had to be developed for multiple waste spark coil setups. Buick has their own for the GN but that's a six and the ECM dealt w issues like dwell from the start. The secondary injectors are driven by a secondary injector power circuit controlled by the ECM grounding the power relay. Firing of the secondary is strapped to the primary injector rather than ECM having a separate driver circuit for them. My point is that some
things may look the same but not necessarily analogous.
As for the slip on reluctor wheel, sounds like an expensive and cumbersome solution for using a CnP setup IMO. How about on the balancer?

06-09-2012	#18
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,685	Re: LS1b (411) PCM Swap Merlot, The LT-5 ICM is unique to this motor. It uses a very similar 14 pin connector however it is quite a bit different from other ICM. Viewing the circuitry, you can think of the DIS as a co-ECM. The base of the LT-5 ECM is the L98. Remember, the L98 ran w 1 coil and a distributor. So something else had to be developed for multiple waste spark coil setups. Buick has their own for the GN but that's a six and the ECM dealt w issues like dwell from the start. The secondary injectors are driven by a secondary injector power circuit controlled by the ECM grounding the power relay. Firing of the secondary is strapped to the primary injector rather than ECM having a separate driver circuit for them. My point is that some things may look the same but not necessarily analogous. As for the slip on reluctor wheel, sounds like an expensive and cumbersome solution for using a CnP setup IMO. How about on the balancer?