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[Jay w]

The LPG kit is going in this weekend, now i have this quandry!!!!

Which lambdas to i connect to? on the 2.6 there are 4 2 i understand are 'heated' and the others are 'cat check'

Now if i have understood this correct, the heated ones are pre cat and the check ones are post cat, if this is the case then i will be looking to connect the LPG kit to the heated lambdas.

can anyone confirm this

Cheers

[Kevin Wood]

You need the pre-cat Lambda sensors. I'm guessing those are the "heated" (all 4 are heated, actually). Certainly not the "cat check" ones, as those are the post-cat sensors.

IIRC, the Lambdas are Titania sensors unlike the 2.5 / 3.0 so they don't have a "signal" and "ground" connection. They have 2 wires from the sensor element which go straight to 2 pins on the ECU.

Neither of these is a ground connection. One is a current source and one a current sink. IIRC, one of the pair is a plain colour, and the other has a stripe. Colours depend on the actual sensor. It's the striped wire that you want to connect to the LPG ECU and you'll get approximately a 0--5v signal.

If in doubt, with a hot engine idling, you should see on a multimeter the sink pin (the one you want) flapping between 0 and 5 volts whilst the source pin sits at around 4.5 - 5v all the time.

I take it you have the wiring diagrams? Otherwise, I'll have a look tonight and dig out some ECU pin numbers.

Kevin