Desperate for some Help With Microsquirt, Beyond Frustrated Options

[Mark Henry]

Just an FYI, the couple of L-jet systems I've tested including an L-jet on a 914 2.0 all ran about 13.5:1 AFR

[Mblizzard]

You're running to lean for an aircooled engine, I'd be aiming for 13.5:1 max, 12.5 is OK. The heads actually get some cooling from the cool fuel charge.
I can run 14:1 because I have nickies, but after that I start seeing a rise in head temps.

I do agree the 134CC injectors are to small. I didn't look at charts for very long, but do you know what your injector duty cycle is? You should never run more than 80%.
Also many injectors are designed to run at a certain duty cycle and do not perform well when they are out of their OE range.

For example 914 L-jet 1.8 injector is somewhere in the mid 250cc range and they do not work well at all with aftermarket systems, where as 2.0 d-jet injectors are huge but perform well at almost any duty cycle.

the 134 was at 50%

[Mblizzard]

OK so I have gone back through all of the advice given. While I thought I had it resolved, I a still not getting one of the injector banks to fire.

Definitely only running on 2-cylinders.

Seems like the INJ 2 bank Pin 10 is not putting out a ground signal.

I have verified that the injectors are mechanically operational- The fire when given 12 V and a ground and I have spark at each plug.

I have verified the wiring is correct and connections are in place from the injection to the AMP Seal Block.

Switch out the wiring from side to side and the problem follows INJ 2 Pin 10 as moving INJ 1 from side to side results in operational injectors and firing.

I have no concept in how my wiring can be faulty and I don't think there is a setting other than turning on sequential fire that would cause one of the injector banks not to fire at the same time.

I have to think this is yet again a hardware problem?

[edwin]

I'd have a crack at putting the correct injector flow rate in the software.
Pretty sure you'll find static flow is the value used.
Also you don't have a barometric sensor connected so get rid of those values at turn the option off.
Also worth Turning off cold start corrections off for your initial tune.
I can't see what you're doing for lambda sensor. Wired to the ecu?
After that it should be slightly more manageable

[Mark Henry]

OK so I have gone back through all of the advice given. While I thought I had it resolved, I a still not getting one of the injector banks to fire.

Definitely only running on 2-cylinders.

Seems like the INJ 2 bank Pin 10 is not putting out a ground signal.

I have verified that the injectors are mechanically operational- The fire when given 12 V and a ground and I have spark at each plug.

I have verified the wiring is correct and connections are in place from the injection to the AMP Seal Block.

Switch out the wiring from side to side and the problem follows INJ 2 Pin 10 as moving INJ 1 from side to side results in operational injectors and firing.

I have no concept in how my wiring can be faulty and I don't think there is a setting other than turning on sequential fire that would cause one of the injector banks not to fire at the same time.

I have to think this is yet again a hardware problem?

So INJ 2 bank Pin 10 is not putting out a ground signal you have to go through all your wiring with an ohm meter and check for continuity. I'm not sure on the ecu check, sorry.
Who built the MS?

The injectors should be fine, but I only run 30-35lbs pressure.

[jd74914]

I'd have a crack at putting the correct injector flow rate in the software.
Pretty sure you'll find static flow is the value used.

Static value is almost always used. (IMG:style_emoticons/default/smile.gif)

Is there a "key-on" barometric pressure sensor option (using the MAP sensor)?

OK so I have gone back through all of the advice given. While I thought I had it resolved, I a still not getting one of the injector banks to fire.

Definitely only running on 2-cylinders.

Seems like the INJ 2 bank Pin 10 is not putting out a ground signal.

I have verified that the injectors are mechanically operational- The fire when given 12 V and a ground and I have spark at each plug.

I have verified the wiring is correct and connections are in place from the injection to the AMP Seal Block.

Switch out the wiring from side to side and the problem follows INJ 2 Pin 10 as moving INJ 1 from side to side results in operational injectors and firing.

I have no concept in how my wiring can be faulty and I don't think there is a setting other than turning on sequential fire that would cause one of the injector banks not to fire at the same time.

I have to think this is yet again a hardware problem?

Unfortunately, it appears that way based on my read of your description.

You checked to make sure the non-firing injectors have 12V at their connectors? And that the ground side of the injector connector has continuity all of the way to the MS connector? I'm reading the above like you did that, but just want to verify.

Do you by chance have an oscilloscope? Or can you use another output rather than the one on Pin 10?

[Mblizzard]

I'd have a crack at putting the correct injector flow rate in the software.
Pretty sure you'll find static flow is the value used.

Static value is almost always used. (IMG:style_emoticons/default/smile.gif)

Is there a "key-on" barometric pressure sensor option (using the MAP sensor)?

OK so I have gone back through all of the advice given. While I thought I had it resolved, I a still not getting one of the injector banks to fire.

Definitely only running on 2-cylinders.

Seems like the INJ 2 bank Pin 10 is not putting out a ground signal.

I have verified that the injectors are mechanically operational- The fire when given 12 V and a ground and I have spark at each plug.

I have verified the wiring is correct and connections are in place from the injection to the AMP Seal Block.

Switch out the wiring from side to side and the problem follows INJ 2 Pin 10 as moving INJ 1 from side to side results in operational injectors and firing.

I have no concept in how my wiring can be faulty and I don't think there is a setting other than turning on sequential fire that would cause one of the injector banks not to fire at the same time.

I have to think this is yet again a hardware problem?

Unfortunately, it appears that way based on my read of your description.

You checked to make sure the non-firing injectors have 12V at their connectors? And that the ground side of the injector connector has continuity all of the way to the MS connector? I'm reading the above like you did that, but just want to verify.

Do you by chance have an oscilloscope? Or can you use another output rather than the one on Pin 10?

No oscilloscope. I have checked all of the connections and wires. Comes down to all of the injectors will fire if 2 injectors are attached to INJ 1 wire. No injector will fire when attached to the INJ 2 ground.

Because these are high impedance injectors I don't think the one operational channel can drive both banks.

[Mblizzard]

Wow. Maybe I am a little sensitive over this now that I have purchased 2 ECUs. Just talked to DIY and I think they said it had to be operator error not hardware. While that hit me a bit wrong, if it is just me and it can be fixed easily then I am all good.

Going to go home and do another data log and see what it shows.

[jd74914]

It does sound like a hardware issue since you've checked both wires end-to-end. As an aside, I've never been happy with the robustness of MS hardware (Microsquirt in particular). It doesn't self-protect well and doesn't seen to have the greatest quality-control either.

Does TunerStudio allow you to manually turn on an output? That way you could make absolutely sure the pin is not grounding with a plain multimeter.

[Mblizzard]

It does sound like a hardware issue since you've checked both wires end-to-end. As an aside, I've never been happy with the robustness of MS hardware (Microsquirt in particular). It doesn't self-protect well and doesn't seen to have the greatest quality-control either.

Does TunerStudio allow you to manually turn on an output? That way you could make absolutely sure the pin is not grounding with a plain multimeter.

Limited ability to configure outputs. Maybe someone with more skill than I have in electronics could work it out but. I configured a control for my external oil cooler fan but that is about the limit of my ability.

All I know is that the first unit had a defective resistor in the injector triggering circuit. This one seems to have an issue in that same circuit. Seems like a consistent issue in this circuit. Could it be my wiring? Sure but the circuit for the injectors is just so simple that it is hard to mess up 2 wires consisting of power and ground.

But I will go pull the log and see what they say.

[jd74914]

If you do into Tools>Injector Test Mode you should be able to force your injectors on continuously (set number of repeats to something high, pulse width to max of 65ms, and off time to 0ms). I'd unplug the connectors at that point and just look at the INJ2 pin. If it doesn't ground and the INJ1 pin does, you definitely have a hardware issue. That should take every other component out of the loop.

[Mblizzard]

If you do into Tools>Injector Test Mode you should be able to force your injectors on continuously (set number of repeats to something high, pulse width to max of 65ms, and off time to 0ms). I'd unplug the connectors at that point and just look at the INJ2 pin. If it doesn't ground and the INJ1 pin does, you definitely have a hardware issue. That should take every other component out of the loop.

That is a good Test idea! Will post the results.

[Mblizzard]

OK took a chance and reloaded the firmware to ECU. Problem solved. Now i just have to get it timed and driavable!

Thanks for the support.

[jd74914]

Awesome! Having to reload firmware is a little ridiculous, but I'm, glad you got that fixed.

[Mblizzard]

So not quite drivable yet. But certainly running. Any insight on tuning tips would be appreciated. Now i am going super lean or rich on acel and get in backfires?

[jd74914]

You'll want to look at your O2 sensor to guide your tuning. What is it saying while you're accelerating?

What are your accel enrichment settings?

[Montreal914]

You'll want to look at your O2 sensor to guide your tuning. What is it saying while you're accelerating?

What are your accel enrichment settings?

Is the O2 sensor/gauge looped back into the MS for live correction?

[Mblizzard]

You'll want to look at your O2 sensor to guide your tuning. What is it saying while you're accelerating?

What are your accel enrichment settings?

Is the O2 sensor/gauge looped back into the MS for live correction?

Was going back through the set up guidance and it recommended setting up the VE table with the accel enrichment off. Looks like I will need to revise the VE table and then set the accel enrichment.

[Mark Henry]

I didn't see or missed it , ITB's Or single TB?

Backfiring can be cured by adding a TPS (on decel) fuel cut.

[Mblizzard]

I didn't see or missed it , ITB's Or single TB?

Backfiring can be cured by adding a TPS (on decel) fuel cut.

Single TB.

Currently not cutting fuel on decel.

Looking at the graphs it seems like everything should be working but it just isn't.