alright, i hooked my boost gauge up but now to the tricky part the electronics. i know i need a relay but i don't know what kind or were to get it. i tried radio shack but couldn't find one that would work, like the one in two out deal. also i have a A/F gauge that i bought of another member of the org so i don't have instructions for it, and im totally lost on how to hook it up. i did a few quick searches and it seems i need to hook it up to the O2 sensor. I just don't have any idea how or were. Any help you guys can give me would be great, im a real newb when it comes to electronics.
Why would you need a relay for a boost gauge?
What sort of boost are you running? Engine doesn't look boosted in your sig.
The AFR gauge hooks into the purple wire coming from your O2 sensor before the catalytic converter. If you look down behind your engine, you can see it there. Splice into it between the connector and the engine, not between the connector and the sensor. There are at least 3 and as many as 5 wires coming from the AFR gauge.
If there are 3, then they are 12V, Ground, and Signal. The Signal wire goes to that purple wire. If you can't connect the other two then find someone to put them in for you.
If there are 5, the other two will be for lighting the gauge. One is another ground and the other will be either 12V or dash lighting, depending on the gauge. I'd try dash lighting first and if it doesn't work, go to 12V.
He's running a GMSC that was installed recently. The sig has yet to be updated.
thanks kardain for explaining my sig. i need to change that, i just haven't gotten around to it.
The reason i need a relay for the boost gauge is for the light.
The A/f gauge only has three wires red(positive) black(negative) and purple for the sensor. would i need a realy to splice into my sensor wire.
The light doesn't need a relay. Relays are to separate low draw circuits from high draw circuits, hooking it directly to a fuse is the preferred way, a relay is WAY overkill.
Yes, you need to splice into the sensor wire, thats the only way you get the signal. You can't cut it, and you MUST have a good connection, otherwise your car will throw a code and go into limp mode.
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i wanted to hook my gauge light up to my headlight wire, so when i flip on my other gauges it will come on as well, that why i believe i need the relay.
If you are talking about the backlight, you don't need to do that... just run a tap from the illumation wire that goes to the stereo. That way, the backlight will dim with the rest of the gauges.
I answer questions like this all day everyday. And what these two guys are telling is the easiest and smartest way to do it both jobs.
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aright now im having trouble with my air/fuel gauge. i ran power from the battery, and i spliced into the purple wire coming from the 02 sensor, so it lights up and everything but al lit does is bounce back and forth between rich and lean even when im sitting still, unless i floor it then it just stays at rich.
Ok... mine is doing the same thing...
Is the oxy sensor on your car only reading from one cylinder outlet (before the 4-1 junction) or from all 4.
On my 2.2, the oxy sensor is on the outlet pipe for the #4 cylinder. Once I install the Pacesetter header, it will be relocated to the downpipe, so it will be pulling a reading from all 4 cylinders.
What is happening is that the oxy sensor will jump from lean to rich on each piston stroke for that specific cyl instead of reading an average of all 4. The ECU will average out the lean/rich readings automatically, whereas the gauge does not.
Kardain wrote:On my 2.2, the oxy sensor is on the outlet pipe for the #4 cylinder. Once I install the Pacesetter header, it will be relocated to the downpipe, so it will be pulling a reading from all 4 cylinders. What is happening is that the oxy sensor will jump from lean to rich on each piston stroke for that specific cyl instead of reading an average of all 4. The ECU will average out the lean/rich readings automatically, whereas the gauge does not.
Well this maybe true if you have a WIDE-BAND o2 sensor....but I bet he has a narrow-band o2 sensor.
A
narrow-band o2 sensor will osculate back and forth all the time. It is really only good to ensure that at WOT your not leaning out the motor. Besides that its a pretty light show.
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well thats pretty useless. guess i should have listened to my friend when he told me to get an oil pressure gauge.
Nah... install it anyway...
Kardain wrote:What is happening is that the oxy sensor will jump from lean to rich on each piston stroke for that specific cyl instead of reading an average of all 4. The ECU will average out the lean/rich readings automatically, whereas the gauge does not.
heh. That's pretty funny. At cruising speed... around 2500 rpm... cylinder firing every 2 rpm... that means it would oscillate 20 times every second at the least.
No... the gauge is reading properly. The engine is constantly correcting the fuel mixture based on the readings from the oxygen sensor so it's always going back and forth trying to stay efficient.
There are conditions when this isn't so... and that's when the gauge is useful. When decelerating with the throttle completely closed, the ECU will lean out the mix or even cut the fuel entirely. The gauge should read fully lean. If it does not, then there could be issues.
When you're accelerating more than just casually, the ECU richens the mix so you don't go lean and detonate. The gauge should read fully rich. If it doesn't, something could be very wrong and DO NOT continue to give it more throttle!
Hopefully now the gauge reading makes more sense to you.
yeah i think i get it. i still don't really think its that useful though, and it bugs me when i drive at night. Oh well, and i did notice the oscillating speeds up with my rpms somewhat. i just need to tune the car so when i take off its not running to rich.
Question: If you cut the purple wire to splice into it can the code be removed(by scanner) once the wires are back together? If not how do you splice into it without cuttting it? Sorry to rehash this......thanks
I used a QuikSplice for mine
They have some that are designed for exterior use which come with a gel inside. The gel keeps out water/dirt to maintain proper conductivity.
