Air Fuel Ratio Meter Not Working :(

[DezertEagle]

Hi All

I went to Ruf Performance to get my Autometer Air/Fuel Meter put in, but they can't get it to work?!

Like nothing comes up?! It's an RB25DET with standard ECU, if anyone can help me out please do so They reckon there is power through all the wires and there is a signal, but they didn't seem overly confident about it.

I remember seeing a thread just like mine, but did the search and can't find it, if someone can lead me to that thread that would also be great.

Thanks in Advance.

[DezertEagle]

You'll never believe what the problem was from a company like RUF Performance....

The polarity of the power wires was wrong, they had red going to ground and black going to power!

I switched them myself (A very long and technical task for me) and now it works!

The only problem is, it seems to read the highest level of richness? All the time too. I heard it may be due to Nissan running their cars rich from the factory?

I have a standard ECU... and RUF seemed to have tapped into the 'Oxygen Sensor' wire correctly as located here:

http://www.datnet.org/new/files/rb25detrec...3pinout.Sat.pdf

[cameron]

The standard oxygen sensor is pointless really for a a/f ration guage, their slow and narrow which means that dont register very fast and will not under heavy acceleration and under boost.

By time it registers under full boost your car could be leaning out and the guage still hasent registered it being lean.

You need to buy a wideband (fast & wide) o2 sensor but they are fairly expensive.

I'm sure sydneykid can further explain what im saying.

Jun