[AL_AOA]

Updates:
Tried everything still timing pulley all over the place

Fixed timing was ON

I turned it off, we got perfect timing

Will fire it up tomorrow!

[Rednaxs60]

Have had the timing issue as well. Using tuner studio, fixed timing on, cranking advance angle MUST be the same value as the fixed timing otherwise it is added to the fixed timing value. Fixed timing overrides all engine ignition timing functions except cranking advance angle. Cranking advance angle is always active - easy to miss even if you have read the WIKI many times.

[AL_AOA]

Have had the timing issue as well. Using tuner studio, fixed timing on, cranking advance angle MUST be the same value as the fixed timing otherwise it is added to the fixed timing value. Fixed timing overrides all engine ignition timing functions except cranking advance angle. Cranking advance angle is always active - easy to miss even if you have read the WIKI many times.

Noted!!

Thank you so much! Will try that again tomorrow.

[Rednaxs60]

No worries. One other issue I had was the timing light. Using my Dad's older Snap-On timing light with a timing advance dial, but it's not rated for wasted spark. Looked into this, and if the timing light is not rated for wasted spark, you have to ZERO the timing light dial and leave it there, the timing light then works like any other timing light without a dial. If you move it off the "0" mark, you may see all sorts of weird and wonderful things.

To test this, once you have set the timing IAW the locked timing value - use "0" degrees (cranking advance angle to "0" as well), unlock the timing - set the cranking advance angle to 10 degrees, crank the engine - should show the cranking advance angle you have set. Learned this on this forum.

Good luck.

[AL_AOA]

No worries. One other issue I had was the timing light. Using my Dad's older Snap-On timing light with a timing advance dial, but it's not rated for wasted spark. Looked into this, and if the timing light is not rated for wasted spark, you have to ZERO the timing light dial and leave it there, the timing light then works like any other timing light without a dial. If you move it off the "0" mark, you may see all sorts of weird and wonderful things.

To test this, once you have set the timing IAW the locked timing value - use "0" degrees (cranking advance angle to "0" as well), unlock the timing - set the cranking advance angle to 10 degrees, crank the engine - should show the cranking advance angle you have set. Learned this on this forum.

Good luck.

Today I scoped filtered cam and crank signals VS coil No. 1

The spark is all over the place, cam and crnk signals are clean and stable, I get full sync signal, but rpm and spark signal all over the place

Fixed spark on/off, cranking advanced deg 0, 10,-10, same as Fixed when on

Nothing is stable

I have no clue what’s wrong

CAM signal is on the 14th tooth of the crank signal, 360 degree /60 teeth = 6 deg/tooth so my trigger degree is either 84 or 276

Tried all combinations with - sign, still spark all over the place, even on wasted COP and sequential spark

[AL_AOA]

Ch1 Yellow is the ignition signal, always switching
Ch2 blue conditioned CAM signal
Ch3 Purple conditioned CRNK signal

[PSIG]

Today I scoped filtered cam and crank signals VS coil No. 1
…

Please continuously update your posts with the changing tune and log files for the post you are making. To simplify keeping those files together, put them in a ZIP file to track the files as a related set.

[AL_AOA]

Today I scoped filtered cam and crank signals VS coil No. 1
…

Please continuously update your posts with the changing tune and log files for the post you are making. To simplify keeping those files together, put them in a ZIP file to track the files as a related set.

Hi,
thanks for getting back!

here is a zip folder with some data logs and the tune file

one important question, what makes my ignition signal look this random, sometimes it behaves as it should, and most of the time it acts so random. Also RPM keeps dropping

crank and cam signals are perfect and in sync

[FiatDuino]

I agree that many of the tooth log page are showing very odd traces. I screenshot below is one of the better ones I found. (2024-01-10.36.45.csv)

The sine wave style highs and lows are reflecting compression as the engine turns over. That's normal.

We are looking for a single high tooth that is approximately 3 times higher than the previous tooth.
In fact, we are seeing two teeth that are somewhat higher than the previous one, but not a 3x height.

The yellow bars added to this image are a stylized view of what we are looking for.

It looks like the trigger is either on the wrong edge (rising vs. falling) or the VR+ and VR- wires are reversed.

The easiest to test first would be rising vs. falling. Take a tooth log of the rising edge to see if that results in a single high tooth. If that doesn't work, try swapping VR+ and VR- wires to the sensor and run another tooth log.

Perhaps others can comment on why, on some traces, we don't see any apparent 'high' teeth and other times we do.

[PSIG]

Perhaps others can comment on why, on some traces, we don't see any apparent 'high' teeth and other times we do.

Do your mean "long" tooth time (at gap) on some compressions and not others?