1.6l ms3 spark cut at 1800rpm
 

As the title says I'm having issues with spark cut at 1800rpm. It starts and idles fine but when throttle is increased to 1800rpm the tach jumps around. I tried the set igntion to 10 degrees and adjust the spark latency while using a timing light method to no avail. As far as I can tell there aren't any other factors that would cause spark to cut this early is the rev range. Attached is the .msq.

Setup:
1.6
ms3
m45 supercharger
stock coils
afm removed

I am a noob so any help is appreciated. Thanks!

did you tune r56 r52 and r11?

A datalog may have been helpful, but barring that, I would venture that your ignitor is failing and needs to be replaced.

All of the resistor pots were tuned in according to the west field manual. See attached datalog.

Also the ignitor was working fine last week before ms3 so unless something ruined it during first startup I would venture to say its still okay.

Ignitor could have been fried. Did you unplug it when first flashing firmware and stuff?

The firmware was flashed outside of the vehicle while powered by a JimStim. The MS3 was plugged in at first with a map configured for a '99 (but not attempted to start), then the 1.6 base map was flashed before first start.

For those of you who don't know, Adam is helping me work on this, hence his response to the previous question.

I dont see anything glaring in the log (looking at raw data). Do you have rev limiter by temp turned on?

I checked his msq and he doesn't.

I glanced at the msq yesterday and didnt really notice anything.

the Req-fuel is a lot higher than normal and 5.0 dwell on the stock ignitor is also high.

Could the higher dwell time have fried the igniter? What is an average value for that?

Also this seems like a stupid question but is the igniter supposed to be mounted on the frame for a ground? Since I redid my harness it's floating under the dash.

for a stock ignitor, i believe i use 3.5ms @ 13.2v.

I don't believe the ignitor grounds itself, so no.

I'll try adjusting that and readjusting the pots. If that doesn't work I'm gonna try to pick up a spare igniter today.

that log doesnt show any sync loss. and easy enough to do a composite log to see if youre dropping the crank or cam signals.

So you don't think it's the igniter? I'll grab another log at lunch and post it up.

Attached is the new composite log with the igniter dwell down to 3.5ms. Changing the dwell had a positive effect on the bouncing revs but the car still won't rev over 2k.

I would venture that your ignitor is failing and needs to be replaced.

I take it thats a common symptom of that failing? Looks like its time to go LS Coils...

So I've removed the stock coilpacks and the ignitor and wired in some LS1 coils (in batch) I had laying around. I'm having the exact same problem that I was having before, spark cut at ~2,000 rpm. I checked the resistor pots and retuned them. 2.48V on R11, 2.35V on R56 and R52 completely counter clockwise. Are there any other things that could be causing this issue?

Also there is a LED that is constantly lit and one that illuminates when I tip into the throttle. I don't even know what each of the LEDs are for.

Why is your spark advance set at 10 degrees fixed?

This was done to check to see if spark latency was the issue, which it wasn't and has since been changed back to using the spark table and the same issue occurs.

I've been messing around with some things and have gotten the car to rev to ~4k by changing the ignition prediction to no prediction. Still not sure of the root cause...

Still having the same problem. Any ideas?

The tune file and datalog you provided both showed your ignition advance is set to fixed 10 degrees.

I have since changed it back to using the spark table and have the same issue. Would you like to see another log?

Yes, both the log and the corresponding tune file.