Lambda sensors for Griff 500, NTK?

[Ryan23]

Hey Guys -
I've got a 99' 500 that is currently getting an astounding 8-9 mpg, gently driven. It's only got 18,000km on the clocks and runs well, just horrible gas mileage. A full tuneup was performed when I took ownership in Feb. So I'm thinking the O2s are probably knackered.

A web search unearthed a Rover part number ERR-6729 for the Chim/Griff. I further crossed that over to an NTK lambda sensor, p/n 25016. Living in Japan, it would be much easier/faster/cheaper to procure one here. Can anyone confirm that the 25016 will suit the Griff?

Cheers

Ryan

[Else]

Not sure but check the threads they may be different.

[blitzracing]

It would take more than a knackered O2 sensor to do that sort of MPG, the default fuel map without lambda feedback is not that bad. It could be something like the AFM causing the engine to overfuel. You need to check the voltage across the black and white wire from the lambda probe on a hot engine at idle. If you see 1 volt or more the probe is working and showing rich. If its cycling 0- 1.2 volts or so its working normally. If its 0 volts the probe could have failed, or the heater supply is missing (red wire 12 volts)or possibly its lean, but seems unlikely in this case :-). The ECU wont turn on the lambda feedback circuit until it gets a signal to show the probe is working. This stops the ECU putting in extra fuel when the probe is cold with no output, mistaking it for a lean mixture. To stop the guesswork the new Steve Heath ECU mate will tell you all you need to know about the sensors, lambda conditions and fuel map you are running, for less than the cost of 2 probes and its a lot easier to use than poking around a hot exhaust trying to read lambda voltages directly!

https://delta.securesslhost.net/~shenglt/catalog/p...

[JonathanT]

blitzracing said:

the new Steve Heath ECU mate

That looks like absolutely the best-thing-since-sliced-bread for TreVoRs.... I'll start saving up!

[steve-V8s]

Like Blitz says check the air flow meter, or in my experience the cable that comes from the air flow meter. Mine started intermittently running very rich and one of the wires was internally broken about an inch from the connector. I cut the connector off and fitted four spades plugged directly onto the meter. In my case you could make the fault come and go by wiggling the cable.