rotaryfan04

Hey does any one kow what wire to hook up a AF guage to the o2 sensor on the 8 is blue white black? can any one help?

mysql101

you're trying to hook up an AF gauge to the car's stock o2 sensor?

rotaryfan04

yes but on the pcm side of the connector but there is 4 wires a blue white and 2 blacks. I know I need the 5 volt return but I dont have a volt meter to know what wire it is?

rotaryfan04

I know I need a wide band 02 before any one lets me know that. Im having a knock when I use my nitrous and Ive tryed everything I can think of I just wonder if Im running ritch or lean when I get the knock and this is a free test.

swoope

iTrader: (5)

you are running lean..

beers

rotaryfan04

Im not sure thats why im trying the guage Ive read its knocks because its lean and ritch

swoope

iTrader: (5)

it knocks when it is lean.

beers

rotaryfan04

Yes I know it will knock maybe knock is the wrong word I'm not sure if its Detonation; Knock; Ping; Pre-igintion. I just know it doesn't sound right and I would like to know what my mixture looks like when using the nitrous.

swoope

iTrader: (5)

all of those describe a lean condition..

beers

rotaryfan04

any sugestions on what I can do to help with the lean conditions?

rotaryfan04

Ive tried 100 octane fuel and charles said maybe coils are bad, but he and I are both stumped.

Brettus

iTrader: (2)

check out the nitrous thread .

Can't you get different jet sizes for fuel ?

rotaryfan04

Charles said not to mix and match jettings but I might, He said jets are only like 2 or 3 bucks each I was going to use my higher fuel jet for the 65 shot and use the 55 shot jets for nitrous.

swoope

iTrader: (5)

do you know for sure that your fuel side solonoid is working?

beers

rotaryfan04

yeah I pulled the lines of the nozzle and sprayed into a bottle for fuel and nitrous, I also checked the side on the module marked fuel indeed had fuel coming out and same for the nitrous side.

rotaryfan04

I also had problems with intake backfires any Idea what caused that? Seems to have gone away on the 100 octane but at 7 bucks a gallon on a daily driver isnt going to go over well lol

swoope

iTrader: (5)

call me.

pm coming..

beers

MazdaManiac

iTrader: (3)

I feel a Darwin Award coming...

swoope

iTrader: (5)

that avatar is so less than you... barely hot..

beers

MazdaManiac

iTrader: (3)

I just like its goofyness.
My avatars are like a good novel with highs and lows.

I love how people think octane is the answer to their car not running well.
The gasoline companies have done their job well.

rotaryfan04

Thanks for your input mazdamaniac but I didnt try high octane to make it run "better" I tried 100 octane because it is guaranteed not to have any ethnol in it and I live in kansas so ethanol concerned me with my nitrous not working well.

rotaryfan04

since 10% ethanol blends dont have to be posted and those blends only come in 91 92 93 octane rated gas I went to race fuel to eleminate me suspicsion of ethanol causing my pings knocks etc

rotaryfan04

Mazdamanic Charles H recomended I ask you if you knew what color the 5volt return signal wire is of the 02 sensor he said you might know if you do this would be helpfull information for me thanks

MazdaManiac

iTrader: (3)

You mean the rear O2 sensor signal wire?
What are you going to use that for? It won't return any useful information (not for tuning, at least) since its in the catalyst and its a narrow band.

Its not a "5v return wire", but the signal wire is yellow. Its pin 2Q on the PCM.
The red and white/red wires are the heater and the brown wire is power from the PCM.
The output is up to 1 volt - .55v is stoich. Anything that is not .55 is useless information.

rotaryfan04

I know its not a vary useful instrument for measuring the af ratio but no one cant figure out why it still knocks so I’m trying to find out if its truly a lean condition even if I cant find out just how lean it is or if its a bad zex module or failing coils? I believe there is a front 02 sensor not in the cat that I was planning to hook up to the colors you mention in the last post are on the pcm side of the connector any reason why you aren’t supposed to hook up on the 02 sensor side? Thanks for your help
Chris