Omex ECU & standard lamda sensors

[Zumbruk]

Can I use the standard lamda sensors on my '97 Chim 450 with the new Omex ECU? They don't seem to work, and even with the Omex recommended compensation factor, the car runs like a dog - misfiring and backfiring all over the place. I've set the compensation value back to zero and it runs OK now, but likely won't pass an MOT.

[dnb]

Personally, I'd ditch the standard lambda sensors. The cost of the bosch wideband sensors is so low compared to the ECU etc (and even to the standard lambdas themselves) that it becomes a no-brain decision to have accurate AFR information for the whole range of sensible operating conditions even if you could work it with the old sensors.

Probably not what you wanted to read...

[GreenV8S]

Worth checking the narrowband sensors are being powered up correctly, they won't give a sensible signal if they're cold. You should be able to get the ECU to show you what signal it is getting from them, this would show whether they're producing basically sensible signals, alternatively just stick an analogue voltmeter on the output.

Since the feedback is so limited with narrowband sensors you really need to make sure the underlying map is right before you enable closed loop operation. In fact I'm pretty sure that OMEX do tell you to disable the feedback until the mapping is complete.

I'd agree with the wideband suggestion too. It's far easier to see what's going on if you have a decent sensor and display system, and this can help reassure you that the ECU is doing its job properly.

If you want to borrow one of mine for a play, let me know.