[safe]

Originally Posted by Walt Fricke

Mark - when first I put a US Lambda 3.0 into my 2.7 I skipped installing any of the Lambda stuff (though of course the FV was there, just not powered). Because of the hard starting this produced I added the Lambda (which the seller had carefully included), which fixed that. But I don't think I damaged the Lambda (in this case the FV) by running with no power to the FV. I added BNC connectors so I can look with a scope conveniently at both the raw signal (what the FV sees) and the diagnostic signal (the nice square wave). They look like they are right.

And I can't think of just why not supplying 12V to the system would harm it, either. I had pretty much just this situation when water (spilled from the cool suit box) got into the relay back by the ECU, rusted the spring inside, which meant the relay wasn't getting power to things. Ran longer than I would have liked in retrospect this way before I figured this out (and added a diode to let me know the relay was providing power, should I ever wonder). Again, no issue with the FV functioning I can detect. To be sure, I am not using an O2 sensor with the system (my Innovate is separate, and does not connect to the Lambda system).

I think widebands are a lot more sensitive.