Well gents I have never been able to stabilize the secondary computor. I finally abandoned the spark control and put an HEI dist with mechanically advanced spark. Starts and runs, first time every time.
Well gents I have never been able to stabilize the secondary computor. I finally abandoned the spark control and put an HEI dist with mechanically advanced spark. Starts and runs, first time every time.
Thanks for the update.
dave w
Interesting to note. Are you talking about the AFR? Or the spark timing?
It's been a while since I read about the physical connections in this thread, but IIRC he was using one ECM for both spark and fuel and the second ECM for spark only. I can see how keeping the second ECM in sync would be an issue, especially where spark timing is so critical. fuel could literally be dumped in at pretty much any time, especially when it comes to TBI fueling and still run without a noticeable issue... *shrug*Originally Posted by 1project2many
The man who says something is impossible, is usually interrupted by the man doing it.
There secondary computor didnt have the ability to advance the spark 90 degrees even though the software would let you change the field to 89.65 degrees. The original schematic was incorrect. Only 1 ignition control module can be used. I could get 1 or 2 sparks out of the second computor then nothing. Changing cyl count to 3, and reducing fuel bpw to 137 resultd in 50% of required fuel. Using cyl count of 6 th fuel pulse of once per rev reduced fuel pulse to every other rev- 50% short. Fuel was still immaterial since I only had sprk on 1,3,5. Excellant excercise, project wasn t completed the way iI had hoped, but I have learned enough that I will never have a problem diagnosing Efi systems. Willys is running very well with 4.3 bin with bpw reduced to 137, havn t even logged it yet. That will come in time. Thanks for ll your help!
Craig
I thought you were using dual triggers and dual ICMs? That would mean that you wouldn't need to change the trigger angle, because the ECM wouldn't know about the other ECM controlling the other 3 cylinders.
If you were trying to trigger two ICMs off a single trigger, yeah that wouldn't work, because of a lack of isolation between the inputs causing them to interfere with each other.
The man who says something is impossible, is usually interrupted by the man doing it.
I was using single trigger and dual ICM. The reason twoICM wouldn't work is becuse the ICM provides a continuos path to ground except when it breaks that ground to cause the coil to fire. Two ICMs, each breaking the ground path to fire the coil at 90 spread = a continuos ground path and no break in the ground. When I removed one ICM I had fire at 1,3,5 and a couple 2,4,6, then nothing at 2,4,6. Two triggers set at 90* might work for the spark, then the fueling is still gonna be goofier than I wanted to bite into.
Have you tried swapping ECMs from "main" to "secondary" and visa-versa to see if it's an ECM issue?
The man who says something is impossible, is usually interrupted by the man doing it.
Posting Permissions
Reply With Quote
Bookmarks