Those who run LPG converted 2.2's

[hunker7]

Yep your wires sound ok. White needs connected to a light circuit to dim the display.

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Where does yellow get connected to? I assume somewhere near ECU?

EDIT: Just read over it, brown is 0-1v output and yellow is 0-5v, so brown is for motronic and yellow is for LPG ecu.

[diesel des]

Yes Brown wire looks like the one. Connect it to signal wire from stock narrow band sensor. Then cut the wire to the narrow band. Put crimp connections on it so you can swap back and forth between sensors if required

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[hunker7]

OK cool. What happens if I connect yellow wire(wide band) to motronic?

[hunker7]

What do the serial in and out do?

[diesel des]

Motronic wouldn't be happy. Serial might be for programming or a logger?

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[hunker7]

Motronic wouldn't be happy. Serial might be for programming or a logger?

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I can leave them alone then

[Kieron20V]

Serial is setting it up and connecting to logging software. Brown wire = narrowband output, to connect to motronic if you want. Just crimp a male spade onto this to plug into the plug behind the head. One with the rubber boot on it and only 1 wire.

Other wire is wideband output for whatever you are using it for, in your case your LPG ECU?

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[prj]

Don't connect the simulated output to Motronic, it does not work quite right IME.

[hunker7]

Thanks guys, it is all fitted and working. On idle it was AFR 11, now adjusted to about AFR 15.5. 3rd on WOT was about AFR 14.5, so that is now adjusted to AFR 12.5-13.2 When I get a chance, I will try and log it to see exactly what AFR I'm getting exactly.

[hunker7]

Don't connect the simulated output to Motronic, it does not work quite right IME.

It will have to do for now unfortunately. Could do 2 bungs when I get new exhaust.

[hunker7]

I've noticed that LPG AFR is very unpredictable. It'll show 15.5 ish then go to 17 for a while and just now it dropped to 13? Any idea why?

[diesel des]

When, at cruise? Motronic should use the lambda probe to keep at 14.7 while at light loads.

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[hunker7]

At cruise it hovers around 15.5 (that''s what I set it to) but then on idle it will go lean for a while or rich? On petrol it's pretty steady.

[diesel des]

The gas afr should broadly follow the petrol afr while Motronic is in closed loop. At full throttle is gas should be set leaner and that is the only difference.

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[hunker7]

OK thanks. I'll set idle to 14.7 then. When WOT it's about 12.5 to 13.5.