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They sure look the same, and have the same wiring to them. But just in case, I have a smart ignition driver IC ready to intervene for the bargain...

The LT1 never used a black block PCM. I'm quite positive the OBDII LT1 PCM was unique to that engine the same as the OBDI PCM was. You can swap...

PCM controls the Dwell on a Vortec atleast. Guessing it is the same on a LT1 since I believe atleast the OBD2 LT1s used the same module.

I fished the case connector from the trans up to the engine bay. I'm going through the transmission wiring harness with it out of the car, connected...

Looking at your picture, you can take make a decent guess that TDC will be the leading edge of each low res notch since the leading edges are all...

handyman the autoprom wont burn a chipthat is not electircly arasable I think.if you post the bin you want burned I will burn you one and you can...

Lionel, I did consider the method you mentioned above before I drew up the current design. It would work, but it would take as much as 2 crank...

Here is how PCM interprets opti signal and what it counts. High res signal is counted at every slot full or empty, totalling 720 counts. Low res...

Getting a plan together first is better than going off half cocked with a "solution". But, you've got it all figured out so go ahead. Still, this...

Uploaded again. Holy thread hijack!

I am not so sure the lt-1/vortec ignition module is auto dwell or not. Guess we'll find out. Not one of the most challenging problems ever, you...

I dont think we'll use an lt1 coil, i think the idea was to use the ls1 coil

Did you find anyone to help with the tune? I'm also looking for help

I'd pay about $25 for 8 from the junkyard assuming they'd work with the LT1 PCM. It's loaded with LS engines these days. Sure, the LS coils are...

Not sure if you were talking to me or not. But I do know that the LS coils with the igniter built in are very basic. Hit one with a 5v signal and...

The 2.8 bottem end, specifically crankshaft are pretty much glass. Plenty of stock 2.8s have broken the crank, including the TBI 2.8 in my 1987 S15...

Here is the gearhead pages for the 1227302 http://www.gearhead-efi.com/Fuel-Injection/showthread.php?372-1227302-ECM-Information-3A and the 1227730...

Here's the coil schematic. Looks like it just needs a 5v signal

I wouldn't assume you can use any coil by simply driving it with a transistor. I'm pretty sure the GM ignition modules have current limiting,...

I forgot that you had found the transistor already...

1) A 5-bit counter is not available in the marketplace. you have to build it out of flip-flops, and I will never give up precious breadboard space...

we might need to in order to prove/disprove any theories. I have no intention of using the original ignition module. The ignition transistors only...

I've been trying to figure out what you're describing. The 1-8 demultiplexer made no sense. A 5-bit ripple counter could work by counting the high...

I opened bin 16243171 in HxD as well, it also has "F0" at bit 2875.

More relavent reading. LT1 equipped boats used the Northstar ignition system ...

Found this pic of the LTCC that uses the LS coils

So does that mean we need to figure out what is on that eprom? I would almost rather use the LT1 ignition module and then use LS coils. I believe...

Hey Doug,it's me! Figuring it out? Ended up buying another LM1 for parts to repair mine,just waiting on it to show up and i'll bring it by. Getting...