Air/Fuel Guage Hook up problem

[bearsbmw]

I have a 95 318i and I taped the line near the ecu pin 72 and everytime I try to hook up the signal wire to the guage the engine cut's and die's and Im lost so anybody have any idea's befor I fry my ecu

[benemorius]

Are you sure it's 72? The only 72 I see on a '95 318 is unused. Also, what gauge are you using?

[bearsbmw]

sorry that's 70 my bad

[Danwec]

Your probably grounding out the wire. Those things are useless anyways, why would you want an A/F gauge!? To look geeky in your pillar?
Standard 1 or 2 wire, narrow band A/F sensors are completely useless. They fall off accuracy at anything outside of 14:1 ratio, and also loose all accuracy at WOT, that's why the computer ignores the O2 sensor outside of light throttle (goes into open loop). Vehicle computers only use them as a hi/lo switch, and vary the A/F ratio several times a second, alternating between rich and lean. That's all they are capable of. If you want to use it for anything practical, get a 4 wire wideband o2 sensor and a gauge for that. There is an australian company that makes a kit for about a hundred bucks, otherwise they are very expensive.

[bearsbmw]

the guage has both narrow and wide capabilities and I would like to use it untill my wide bung is welded up .. thanks

[bearsbmw]

problem solved