Rover Gauge question

[ClassicChimaera]

blitzracing said:

If the switching is stopped at idle- just give the car a rev and check it restarts cycling again. I dont know for sure why this happens, but Ive seen it quite a bit. A lazy probe will still switch, just slowly- so this maybe what you are seeing at idle. If the probe has died totally - ie the output is zero, then the long term trim shifts bit by bit until it reaches 100% as the ECU tries to correct the mixture, but cant as there is no output. It will eventually throw an error code, but it takes some minutes. The ECU wont throw an error code if the probe switches at any point in this period, so it wont trip a fault code at all easily. You can always back up RoverGauge by popping a test meter across the probe output wires- black and white and see if you have any voltages- its in the range of 0 (lean) to 1.4 volts (Rich).

Good article here on the lambda cycling:

http://www.g33.co.uk/images/PDFS/14cux%20faulot%20...

Enjoyed that

[Plan B]

thanks for the useful feedback

[Plan B]

Quick (and depressing) update.... Made up my lambda removal tool from a Draper £4-00 deep socket + angle grinder treatment and removed said sensors - both of them are well and truly fooked - for different reasons.
The one that was reading +100% on Rover Gauge during warm up phase is pretty much eaten away with heat with bendy sections of metal peeling away and the other which appeared to be working ok has got 75% stripped threads - I assume due to a previous (to me) gorilla-type mechanic.

So a final question for you guys - I've looked at replacement prices and bloomin 'eck ouch! The sensors on the car are made by Sagem (French) - any recommendations for replacements at the value/acceptable quality end of the scale?

[stevesprint]

You get what you pay for, I use NTK OTD3G-3A1 without any issues

OTD3G-3A1 NGK NTK TITANIA LAMBDA SENSOR [0453] NEW in BOX
http://www.ebay.co.uk/itm/OTD3G-3A1-NGK-NTK-TITANI...

[Plan B]

I ended up buying from TVR Parts. With Owners Club discount price was better than expected.
Thanks for all the advice guys.

[blitzracing]

Cheaper from the USA-

http://www.ebay.co.uk/itm/Oxygen-Sensor-OE-Type-NG...


But the connector will need swapping over.

Edited by blitzracing on Friday 21st April 16:22

[Plan B]

Yep that is cheap. The sensor end looks different from the ones I've taken out (but they are marked "Sagem")