DIY Air/Fuel Gauge
Thread Starter
Joined: Jul 2002
Posts: 13,151
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From: Washington DC
Rep Power: 425 
DIY Air/Fuel Gauge
Aight... I'm sick of seeing this asked. It gets asked like 3 times a week and no one seems to want to search. So here... Sticky and Bold this so that no one can miss it.
Open the hood. Look straight down the exhaust manifold. There is a plug with a bunch of wires going to it just under the header. Thats your O2 sensor. Trace the wires back to the grey connector plug near the engine block (over on the right side, under the radiator hose). Slide back the wire shroud so you can see the wires (4 of them). Put a tap splice on the BLACK wire between the O2 sensor and the connector.
Run the wire inside the car. I recommend you not run the wire attached to the gauge through into the engine bay. It won't reach and it'll mean you'll have to splice the wires together in the engine bay. You'll be better off joining them inside the car so you minimize the exposed wire. Attach the wire you spliced into the O2 sensor to the purple wire on the back of the gauge. You need to find 12V and Ground. The Yellow/Green stripe wire that goes to the Cig lighter is 12 V, there is a screw behind the lower dash panel (w/ the lighter in it) that is a ground post, or you can run a ground wire in from the engine block (I did this). Hook up power and ground to their respective wires and thats it.
The gauge will oscillate back and forth between rich and lean. Don't expect it to stay in one place. It will completely disappear if you're moving and you take your foot off the gas (good old ULEV in action), and don't be surprised if it favors the lean side rather than rich (ULEV again). It should go rich if you floor it.
Open the hood. Look straight down the exhaust manifold. There is a plug with a bunch of wires going to it just under the header. Thats your O2 sensor. Trace the wires back to the grey connector plug near the engine block (over on the right side, under the radiator hose). Slide back the wire shroud so you can see the wires (4 of them). Put a tap splice on the BLACK wire between the O2 sensor and the connector.
Run the wire inside the car. I recommend you not run the wire attached to the gauge through into the engine bay. It won't reach and it'll mean you'll have to splice the wires together in the engine bay. You'll be better off joining them inside the car so you minimize the exposed wire. Attach the wire you spliced into the O2 sensor to the purple wire on the back of the gauge. You need to find 12V and Ground. The Yellow/Green stripe wire that goes to the Cig lighter is 12 V, there is a screw behind the lower dash panel (w/ the lighter in it) that is a ground post, or you can run a ground wire in from the engine block (I did this). Hook up power and ground to their respective wires and thats it.
The gauge will oscillate back and forth between rich and lean. Don't expect it to stay in one place. It will completely disappear if you're moving and you take your foot off the gas (good old ULEV in action), and don't be surprised if it favors the lean side rather than rich (ULEV again). It should go rich if you floor it.
Re: DIY Air/Fuel Gauge
[QUOTE]Originally posted by Boilermaker1
Aight... I'm sick of seeing this asked. It gets asked like 3 times a week and no one seems to want to search. So here... Sticky and Bold this so that no one can miss it.
Does anyone know how to do a DIY on the Air/fuel ratio gauge?
Aight... I'm sick of seeing this asked. It gets asked like 3 times a week and no one seems to want to search. So here... Sticky and Bold this so that no one can miss it.
Does anyone know how to do a DIY on the Air/fuel ratio gauge?
Registered!!
Joined: Feb 2003
Posts: 401
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From: Bellevue, Washington, US
Rep Power: 0 hey Boilermaker1 i noticed ur signature pic with ur car and names of some companies on the side. I noticed u have Custo as one of them. im kinda curious to know if Cusco makes anything for our cars? i always thought they didnt have anything for our cars, but maybe im wrong.
BTW ur car is really nice!! i love ur rims
BTW ur car is really nice!! i love ur rims
Thread Starter
Joined: Jul 2002
Posts: 13,151
Likes: 3
From: Washington DC
Rep Power: 425 Originally posted by EM2HK1
hey Boilermaker1 i noticed ur signature pic with ur car and names of some companies on the side. I noticed u have Custo as one of them. im kinda curious to know if Cusco makes anything for our cars? i always thought they didnt have anything for our cars, but maybe im wrong.
BTW ur car is really nice!! i love ur rims
hey Boilermaker1 i noticed ur signature pic with ur car and names of some companies on the side. I noticed u have Custo as one of them. im kinda curious to know if Cusco makes anything for our cars? i always thought they didnt have anything for our cars, but maybe im wrong.
BTW ur car is really nice!! i love ur rims
The DC5 rear strut bar fits like a glove...
It bolts into the frame rail in the trunk too
Registered!!
Joined: Dec 2002
Posts: 252
Likes: 0
From: carmel, Indiana, US
Rep Power: 0 If all you have in your car is a cold air intake will those Air/fuel gauge really do anything for you or not really?
How much more stiffer dose your car feel after putting the DC5 rear strut bar? How good of a company are they? Im looking for a rear upper strut bar but Im not sure where to get it from.
How much more stiffer dose your car feel after putting the DC5 rear strut bar? How good of a company are they? Im looking for a rear upper strut bar but Im not sure where to get it from.
Thread Starter
Joined: Jul 2002
Posts: 13,151
Likes: 3
From: Washington DC
Rep Power: 425 Originally posted by no
If all you have in your car is a cold air intake will those Air/fuel gauge really do anything for you or not really?
How much more stiffer dose your car feel after putting the DC5 rear strut bar? How good of a company are they? Im looking for a rear upper strut bar but Im not sure where to get it from.
If all you have in your car is a cold air intake will those Air/fuel gauge really do anything for you or not really?
How much more stiffer dose your car feel after putting the DC5 rear strut bar? How good of a company are they? Im looking for a rear upper strut bar but Im not sure where to get it from.
Answer to question 1... It helps me realize how bad the stock fuel map sucks. And it makes for a nice conversation piece.
Answer to question 2... it makes a difference... and Cusco is one of the best JDM suspension tuners out there.
Last edited by Boilermaker1; May 18, 2003 at 06:11 PM.
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iTrader: (5)
Joined: May 2001
Posts: 2,317
Likes: 0
From: PG county, MD, Maryland, US
Rep Power: 0 hey
i installed my AF guage today but it keeps reading Rich
when i cut the car on and when i drive.
it doesn't move at all
did i hook it up wrong or is something wrong with my car
any help would be appreciated
thanx
i installed my AF guage today but it keeps reading Rich
when i cut the car on and when i drive.
it doesn't move at all
did i hook it up wrong or is something wrong with my car
any help would be appreciated
thanx
Registered!!
Joined: Jun 2003
Posts: 89
Likes: 0
From: Milwaukee Wi
Rep Power: 0 which o2 sensor wire did you use and alos which o2 sensor. i can't remember the color of the wire but you need to test the wire for voltage. it should be 1. the only 0-1 volt wire 2. the only wire that changes voltage as the engine revs. the o2 sensor under the hood is NOT a 0-1 volt. i used the one on the cat (2001 ex). just test the wire and you should be ok. 1 in 4 chance.
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iTrader: (5)
Joined: May 2001
Posts: 2,317
Likes: 0
From: PG county, MD, Maryland, US
Rep Power: 0 i figured it out
the splice into the O@ sensor wasn't deep enough
so the rich( green light) was pretty much just showing power
working just fine now
thanx for the quick responses thou
it is really appreciated
the splice into the O@ sensor wasn't deep enough
so the rich( green light) was pretty much just showing power
working just fine now
thanx for the quick responses thou
it is really appreciated
Thread Starter
Joined: Jul 2002
Posts: 13,151
Likes: 3
From: Washington DC
Rep Power: 425 I used 18... That seems to be what the sensor is wired with, but the ECU wires look like 22 so somewhere in that range should be fine.
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