Air Fuel Ratio Gauge Install

[TheDrumAndTheBass]

Well, now that I am almost done changeing my head gasket, I will soon be installing a number of gauges to help monitor the status/health of my engine. The first of these will be an Autometer air/fuel ratio gauge. If anyone out there has installed this specific gauge and could help me figureing it all out I would appricate any info I could get. I'm buying this gauge from a friend of mine that was going to install it in his RX-7, but now is into morotcycles. It has never been used, but we can not find any trace of the instructions. O yeah, and it's going in a 89 KA24E if that makes any large diffrence.Ryan

[Just another 240]

u know i would have helped you if i stole the gauge from autozone..but i didn't...so can't help you.lolz

[TheDrumAndTheBass]

Ha, I didn't steal the gauge from Autozone either. In fact, I didn't think they carried Autometer gauges at Autozone. I just know my friend I got the gauge from, originally bought it from Summit.

[Just another 240]

u know i sometime think i should have stole it..becuase if i don't..someone else would..comeon it's autozone! lolz...but then i dont' wanna risk it for a 50buck gauge..anyways...how many wires and stuff is on the gauge, maybe i can help you by describing it..

[themadscientist]

how many wires and what colors?

[Dano]

usually with A/F meters, theres 4 wires, one to the o2 sensor (green?), one power (red), one ground(black), and one to the lights (white?) ......am i correct?

-Dan

[themadscientist]

the yoyo autometer one has three I think; black(ground) White(ignition hot) and purple(signal from O2)I've had two in my hand and the marbles are a litlle loose in the head so i might be mistaken.

[slow s13]

I just did an autometer one and purple is the O2 wire if it has a white wire it is ilumination. red wire is b+

[fiznat]

theres a DIY about A/F gauge installs in the FAQ/DIY stickey on NICO General...

[Dano]

so yeah i was right, but here's revised..:

Red wire-Power (duh (but sometimes white)) to 12volt sourceBlack wire- Ground (duh) make sure u ground well!White wire-illumintation (pretty common) u can connect to interior gauges or dim switch...Signal wire- other color (usually blue/ purple/ or green) to o2 sensor

-Dan

[Dano]

o, ****, read fiz's post, we posted at the same time

-Dan

[S13240]

I've had a problem that I still can't figure out about my autometer a/f ratio gauge yet.

When I turn my key to on the red led would light up on the gauge and when I turn on the engine the gauge's led would flash up and down quickly in the stoichometry/ideal area of the gauge and just die like there is no more power coming to the gauge? What do you guys think what could be the culprit?

[SilGuy]

so which color is the signal wire on the 240? Thats all you need to know. On most of the generic a/f gauges, u just need to know tthe color of the signal wires on the gauge and the o2 sensor. The other wires are misc.....

[S13240]

Ok I finally solved the problem today, but it seems to be showing that I'm running really lean. I had a bad ground so I had it grounded to the engine, same place as where I have the negative terminal from the battery hooked to near the throttle body.

[SloS13]

the o2 wire is white and located above the 10mm harness bolt if i remember correctly. If its showing lean, that COULD mean that there's not a good connection signal wire/gauge wire, so make sure its soldered or you wont get an accurate reading.

my ****s rich as hell, while im crusing, it doesnt even bounce around it just stays green