Ecumaster forum

ive tried inverting the check engine light output but It doesn't turn off. ive also tried disabling error feedback and it doesn't turn off.
when the motor knocks, the light slightly dims, then will turn off completely if I stay on the throttle too long.

and speaking of knock, ive tried setting my knock signal threshold by recording the engine noise by doing pulls at only 7psi. but I have to set the voltage threshold to what seems like really high levels. maybe my motor is just noisy. I Shouldn't be getting knock at such low boost and somewhat mediocre timing.

How did you connected and to what output your check engine light ? (lamp or LED) ?

AUX 3 is assign to two parameters, Check engine light and parametric out #3. Did You do it on purpose ?

It's on aux3 as per the wiring diagram I was supplied. It's running to the factory light in the dash which is a normal 12v bulb, not a true led.

Parametric output? If that's selected, i don't know why. Perhaps by accident. I'm not sure what purpose that option would serve. Ill see if I can fix that.

And with the knock parameters, the frequency, timing selection and cylinder events, the firmware can ignore mechanical engine noise right? I might have had my knock ignition events in the wrong order and trying to listen at the wrong times. I looked again at the spark ignition firing order and changed the knock events to match.

So my firing order is
2
4
1
5
3
6

And now my knock events are
1 is sensor 1
2 is sensor 2
3 is sensor 1
4 is sensor 2
5 is sensor 1
6 is sensor 2
Because knk1 is the front 3 cyl and knk2 is the rear 3 cyl. Have I made the correct changes?

Edit;
Turned off Po3, so the check engine like is working exactly as intended now.

My knock sensor activity was real high. Even at 7psi, 10* total timing advance, and 12.4:1. I had to lower my sensor gain to 0.19. Now engine noise is all below 3v all the time now.

what frequency are you looking at??

thats really low gain you might just be getting a lot of knock even at that low boost... double check your timing is zeroed in well!!! that is a very common and often fatal error!!

I temporarily set timing advance to 10* across the rpm range. So it *shouldnt* knock there.
I set my afr to 11.8-12.2 range also.

The frequency is 6.67khz

You need fine tune your engine noise table, ECU is seeing false knock now and apply corrections...

Thank you friend.

I adjusted the gain so that the engine noise doesn't exceed approx 3v according the help guidelines.
I've all but removed the false knock like you are referring to. I then readjusted the engine noise table so it's only .3-.5v above the average noise. And it pulls 3* per volt. Now

How do you configure the knock sensors??

ihiryu wrote:How do you configure the knock sensors??

Go to Knock sensor menu, follow direction in Help file. adjust sensor frequency, gain, and integrator for your engine. tell EMU which ignition event is which knock sensor in Sampling, make EMU knock response active in Action, and The engine noise table is where you tell the EMU how much voltage to expect at each RPM point. It will determine knock from there. Knock tuning is just like fueling and timing, you have to adjust for YOUR engine, and not someone else's.

So more or less,

Say 2500 rpm's. jack up ignition timing until we have knock, and it'll just sample it?

Guess it's time for me whip out the good ole det cans

You have to tell the ecu which point in time which cylinder is firing. You don't want the sensor trying to listen at the wrong time. So that's why I had to change my sampling events so the correlated with my ignition events.
I watched motecs webinar on setting up knock sensor tuning.
It was very helpful and they pointed out that there are accepted standards for certain things, like only listening from 10* atdc and for a 60* window of engine cycle. And they also explained about the sampling event.

Have a look. The concepts carry over to user defined knock control
https://youtu.be/AH-Q9QEjShs