Big Bear

For xmas I was given an air/fuel ratio meter , the question is which wire do I attach the signal wire too at the ecu ? The car is an STi version 2 .
Cheers Dave

piravlos

if it is an autometer, visit their website and you will find full fitting instructions

Big Bear

I have the instructions for the unit , but I need the wire that goes into the ecu from the lambda sensor to connect up the A/F meter .

[Edited by Big Bear - 12/27/2001 9:19:26 AM]

john banks

Link ECU manual would tell you, but the only web link I have is for WRX 99/00. Some kind person may help if you post - "Lambda sensor signal line STi II ECU"

john banks

A few hints people gave me for reading lambda data.

Note that at any significant boost/open loop you will be reading outside the stoichiometric range, so there are considerable errors in the results depending on EGT, but it is still a useful gauge. I thought it was rubbish until people told me how to read it. The link ECU suggests targets of just under 5% CO/just over 13:1 for 3-9PSI, 5.5%CO/12.5:1 for 9-15PSI and 7% CO/11.5:1 for 15+ PSI. But this is based on a MY99/00 turbo not STi, but is probably similar.

Of course it will start to read overlean if you keep it on boost for a while, so you have to read for up to 20-30 seconds and then let the lambda sensor cool down by driving as though Mum is in the car for a few mins

Of course, just because your exhaust gas oxygen is OK don't think you can't det. It is just one factor.

Hope this is helpful - certainly this info helped me a lot.

Also consider the health of your Lambda sensor if you get funny results on a car of this age - some have lasted less then 3 years.

[Edited by john banks - 12/27/2001 9:50:58 AM]

ssubaru

Hi big bear
if u have a three wire sensor red=positive black is negative and other wire is the ecu sensor wire but if u go to lucas they have a small drawing with there sensors showing most types of wireing
ssubaru