TheLlamaGod

i just put in my narrowband afr gauge and it has only one light lit up at idle and only a few when i full throttle. my car cant be running that lean all the time.
its an autometer gauge. what could be causing this?
TIA for the help

TheLlamaGod

nobody can help? the car has 3fpr, mbc, 951 max chip set. idk why it would be running so lean

Rogue_Ant

Bad O2 sensor perhaps.

TheLlamaGod

how do i test an o2 sensor to see if its bad?
also, if my car was running as lean as the gauge says it is. wouldnt i notice a difference in how it drives?
because my car seems to be running as good as ever.

Rogue_Ant

Hook up a voltmeter to the O2 sensor - you should see it dithering around .5v when the car is warmed-up and idling.

TheLlamaGod

at idle i was getting 8.5 mV
that seems crazy low compared to .5 v.
what does that mean?

Rogue_Ant

If you hit the throttle, does the voltage change? If not, then your O2 sensor is bad...

TheLlamaGod

well today when i was driving, the gauge showed no lights. and when i did WOT it showed one lit. so the voltage is changing.

Paulyy

this happend to me not to long ago. same gauge and it wouldnt light up or sometimes lights up red. I make the computer (LINK AFM) abit richer but nothing. i changed the O2 sensor and the gauge lit up

TheLlamaGod

wouldnt my car run weird though if i had a bad o2 sensor?

alxdgr8

Well there's your first problem...

Paulyy

its hard to tell. when you do is turn the car on and un plug it and see if it runs the same

Josh B

Don't waste you time with a narrowband for a turbocharged car - completely useless and really dangerous to count on. Throw that thing away and buy an Innovate A/F meter or a Zeitronix. Don't go onto boost until you know what your A/F curve is unless you like swapping out short blocks. It is very easy to destroy these aluminum cylinder walls with mods.

TheLlamaGod

for the wide band do you have to make a new place to put the sensor?

Josh B

You'll need a bung welded on after the turbo for a good reading and sensor longevity. If you buy the Innovate setup is comes with the bung and any muffler shop would weld it on for you with the muffler still on the car.

I am not sure where you are located but if it is near Atlanta I can recommend a shop. Might want to add that to your profile.

If you search on the forums you'll see the pics of the optimal place to put it. Wiring it up is really easy - just need power and ground and hook up the sensor to the gauge and you are good to go. I would pick up one of the metal guage holders for under the radio that Lindsey sells.