hey guys, i dont have a fuel pressure gauge yet so my only source of fuel pressure is my air/fuel gauge.
now about a week ago i had some problems with my SC so i fiddled with the AFPR, i dont know exactly where it was so i had my friend look at the gauge while i adjusted it at idle. i set it at a point where the leds light up to just about the end of the yellow leds and the begining of the green leds, with the first green rarely lighting up. now everything seems fine, flooring it it reads rich and idle it just goes back and forth between red and yellow.
now my question is my FP set too low? because i think i remember before adjusting the AFPR -at idle it used to go into the green section about 2-3 leds....no real problems though, just wondering in case i am messing something up.
At idle it was in Green? That sounds like it is way to rich. Who knows with these gauges. On mine idle is between the first yellow light and the last red light back and forth. When boosting it goes straight to the last green light nothing in between. If it runs fine with no detonation or hesitation then leave it alone. Don't trust my readings though, because my gauge does not bounce from left to right like everyone elses. It just reads directly what the ratio is. Do you have a ignition or plugs. What O2 sensor are you connected to? The first or the second? If you have it close to rich that sound ideal becuase that is where I have been trying to get it at idle, but my car is in the shop right now.
To answer your question it seems like your pressure is just right not to low.
its really hard to tell with these narrow band sometimes... i have the A/F guage that comes with the J&S safeguard dual monitor.... its either all the way rich or all the way lean =P
i need to install my A/F guage.... what O2 sensor did you guys install it on ? The first one that is on the header or the second one after the Cat. ?????? Also they both have TWO solid White Wires ! which one do i tap the A/F guage too ? does it matter ??
Thanks
I hooked mine up to the primary O2 sensor. You want to hook it up to the white wire of the O2 sensor and the ground of the O2 sensor. This cleans up the reading. If you ground it to the chasis you'll get interferance and have several led's lighting up at once on the gauge. I can't remeber the location of the white wire but the ground wire is D11 and the white one is a few to the left of that (D7 i think, but I'm not sure). This is what I did and I get one clean LED at all times.
soon2bsh, how do you adjust a FPR so that it lines up with only one LED at idle??? Did you set it so that the last Yellow LED is the richest it'll go?
what do you mean? i think i have to turn up the pressure some more because at at idle- you know how the leds bounce back and forth it does that but only to about the last yellow led and then it goes back down then up then down then up...you know....so what do you guys think do i need to turn the screw more to the left? btw where do you guys have it set? how far from the max right? and when i floor it it goes to about the last yellow-first green. should it not be all the way rich?
Though the stock O2 sensor isn't known for its accuracy, and as much as I hate to tell you which "LED" to set your FP at, I think it's safe to say that you should, at the very least, be running a couple lights into the green.
About 3-4 lights into the green will be good enough to let you know that your car is running rich, or at least rich enough so you don't ruin the engine.
Get on a Wideband O2 sensor to see the exact (or close enough) mixture.
I believe I read somewhere that there is a honda part number that is a wide band o2 sensor.. it came on the civic vx or something is that just as good as gettn a more expenisve aftermarket wideband o2 sensor?
That's just the sensor. The expensive part of the wideband setup is the controller. On a $1300.00 wideband setup, $200 of that is for the sensor itself, the rest is for the controller. There's instructions on the diyefi board on how to make a controller yourself for the Honda sensor, but it's very crude. It outputs a voltage level which you will have to translate yourself into a/f ratio.
Get a fuel pressure gauge. The standard a/f sensor is even slower and more inacurate at idle then when driving.
__________________ DirtyLude
Mark Higgins
Toronto Prelude Club www.hondaprelude.to
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