Im not sure if im posting in the correct place. Depending on what's going on, this could go here, or in electronics. Or maybe even the fuel thread.
But whatever,

I just installed Aeroforce's wideband kit for the interceptor gauge. I got it all set up, and I hit the cal button like im suposed to.

My tune has my downstream O2 sensor deleted, so I took out the old O2 sensor, and put the one that came with the kit in. I have it all wired up. When I turn my ignition on, with engine off. Everything comes to life and my A/F reads 14.5 ? Shoudlnt it read something like 19.9 - 20 with the engine OFF? Youd think it would be full lean.

I started it, drove it arround abit.
I noticed that for the most part it stays at 14.5,
at idle, at cruise, sometimes it goes 14.7 or 14.2
Even when coasting in gear it reads 14.5...
However
Ocasionaly it will jump up to 19.9 when coastin in gear, wich shows the fuel injectors turning off like they are suposed to.


Also when I really romp on it, it stays 14.5, then after a few seconds it goes to like 11 or 10 ( I coudlnt watch it the whole time as I had to see where I was goin)
Then it moves arrount for a few seconds then sticks back to 14.5 ?
I sit still and rev, it stays 14.5.
What's going on? Is this normal?

 

perfectly normal. When you're coasting and it jumps lean like that, that's your deceleration fuel cut off.

The reason it takes a second to get to 11~10 is because even though your foot is technically at WOT, there is a delay before full power is actually delivered. When you return to normal driving after a WOT pull and it jumps around like that, think of it like a visual demonstration of your computer re adjusting how much fuel is being delivered.

All these things are adjustable if you have tuning software.

 

Cool thanks
Thats what I was hopeing for but wasnt sure. Im guessing its switching
between open and closed loop? when it does that?
I didnt think it would be able to maintaina a perfet 14.5 at random throttle settings.
I was afraid I had some sort of wireing error or malfunction. When I dynoed it last year
I was WAY Richer then 14.5 but those pulls were WOT also.

I just thought it was odd to always be 14.5

 

Mine, at idle and sometimes cruising, will occasionally peg all the way lean randomly. I'm not sure what the hell is going on. lol I'm going back through to check the wiring, but the O2 sensor works fine (passed test) and it's snug in the bung. I'm sure it's not the wiring and the sensor though.

 

Does it peg out lean when your say, foot off gas, in gear,
or going down hill?
If so thats normal, its the injectors turning off.

 

I'm at a standstill and at idle.....it stays around stoich and then randomly pegs out the gauge (lean) real fast

 

Yup perfectly normal. I just hooked my wideband up today and was looking at it a little wired too haha. I found that unless my foot is really into it, it will stay around 14.7ish. And go full lean ofcourse off the gas. If you're seeing 10 WOT it's time to unlock some hp with a tune haha

 

So it's completely normal for the gauge to randomly peg out lean at idle (say every 10-15 seconds) and at a standstill with the foot off the gas? From what I've seen, this is not normal for other cars... I understand that letting off of the gas pedal when driving will cause the gauge to go fully lean.

 

Oh, my car doesnt do that. It just sits at a constant 14.8. Could be in the tune. Hopefully someone can chime in for ya

 

lol I didn't think I was crazy

It's been doing it ever since I installed it

 

WHen I thought something might be up with mine,
I disconected my ground wire.
This caused a constant 19.8 reading all the time.
(Pegged out lean)

So maybe you have a loose ground connection for your
converter box?

 

That's what I was hoping. I'm going to fix it tomorrow and recheck. Thanks man.

I'm sure the vibrations from my mounts aren't helping either. lol

 

Vibrations from mounts wont affect AFR. If anything they will show false knock but that of course isnt read by a wideband.

OP the delay you are seeing at WOT is most likely your Power Enrichment Delay.

 

Vibrations can cause a loose connection to be come intermitant however. And thus could induce False AFR readings.

Cool thanks. I take it, that is adjusted in the tune?

 

Thats true I guess. Usually when a wire comes loose the wideband goes to a number and does not move from it so you can usually tell, unless of course the wire is just coming in and out of connection

 

if you still have a cat to get accurate readings the wideband should be before the cat not after

 

on mine i was seeing idle around 14. to 14.7 at wot i was seeing 12.5

 

^little lean

 

wait i think it was a 11.5 lol i sold it so i cant verify on that. im pretty sure 11.5 at wot