Microsquirt file review

[Drscottsmith]

Haha - thanks for adding to!

So I THINK my ICV is working - as I can tell a difference when I make changes in the warmup duty table….but I think it is not fully closing at 100%….not sure how to deal with that. I can increase the VE up to about 63 to get the afr to around 14 - but that is at 1300-1400 rpm

If I pull the icv line at the interloper pipe off and plug it - I get a great smooth idle. So I think some setting is not right.

I have a 3 wire icv, and it defaults open with no power. I made a little circuit to maintain one coil on while the other is off (from Dare over on RL).

I thought about simplifying everything and just going to pick and pull and grabbing a 2-wire icv and using it instead but not sure.


What do you guys think?

[Drscottsmith]

So did some fiddling around tonight and here is where I am....

I am not sure my ICV is working correctly, if at all. The circuit I built from Dare's instructions basically just ensures that when one of the coils in the ICV is on, the other is off.

So I disconnected the ICV and got the meter on the plug. I am getting +12v on the center pin with ignition on and grounded. If I go into ICV test mode and move the Duty Cycle to 100, I get about +9v from both side pins (either pin) and the center pin. If I change the duty cycle to something low, like 10, the voltage drops to about 9 and some change.

I was hoping I would feel the casing move slightly as the valve moved in and out, but I feel/hear nothing when it is plugged in and I run the test.

I am really not sure what the test does - one video I watched just moved the plunger slowly in and out, which if that were the case I would expect the voltage to slowly rise and fall somehow.

Please advise - I am stuck.

Thanks!

[Drscottsmith]

I cannot do ANYTHING with settings (VE, Ignition, etc.) to bring the idel down - all I get is a change in AFR on the gauge.

[944m3]

With the key in the ON position but the engine not running, I can hear a clear clicking when I test my ICV from my ECU.

You might have a compensation table enabled somewhere, maybe idle compensation. Try disabling all closed loop features. Are you seeing the expected ignition timing at BTDC? Are you seeing any of your trim gauges doing anything unexpected?

[Drscottsmith]

One more really stupid question that maybe is an issue.

The line I had temporarily plugged is the line from the icv into the intercooler to throttle body pipe.

If I take that loose it is pulling vacuum big time - and sealing it with the palm of my hand brings the idle down nice and smooth - just making sure that I should be feeling that much vacuum there - and I think that is correct since that is coming off of the manifold and would have all of the vacuum available!

[Evan]

One more really stupid question that maybe is an issue.

The line I had temporarily plugged is the line from the icv into the intercooler to throttle body pipe.

If I take that loose it is pulling vacuum big time - and sealing it with the palm of my hand brings the idle down nice and smooth - just making sure that I should be feeling that much vacuum there - and I think that is correct since that is coming off of the manifold and would have all of the vacuum available!

Yep, that’s normal that line should pull strong vacuum since it’s post-throttle body (manifold vacuum). If blocking it smooths idle, your ICV might not be compensating right check for leaks in that hose or test the ICV itself. Make sure it’s hooked up right and not stuck closed.

[cmurphy034]

Following.. currently doing a microsquirt project in my 951 (LS coils, 63 lb injectors, missing tooth wheel etc). Do you have any base map for your car which may help as a starting point?

Thank you in advance

[PSU_Crash]

In your second msq the idle control is not turned on. It should be set to PWM valve under idle control. I assume you had this turned on since the test mode is not available with out that option on.
I use a porsche ICV on another megasquirt car and I have had the valve stick open on me. It gets your attention when the car starts and goes right to 5k RPM. Sounds like yours isn't doing that though. The valve works on short pulses of 12V to each coil. You won't be able to measure that accurately without an o-scope. You should be able to go into test mode and see/feel that valve open and close. It has a bit of a buzz to it when operating.
Accell enrichment is one of the most difficult things to get correct. It takes a lot of playing around. In the end I did a blend of MAPdot and TPSdot. Finding the right threshold for each of those is a bit of trial and error.
I'll take a look at the logs tonight.