all my sensors are acting up, any idea?
 

I have a 92 preldue with swapped in h23, with turbo, 5-7psi. aem rail, 450cc injectors, s-afc. the car runs good till I start to hit boost than than engine light comes on, than the cars run good till aboput 4000 rpm, than I have a lot of black smoke, it sputters really bad. I just put on a new o2 sensor like two days ago. so I check the ecu for codes this is what I got. 37-map sensor 41-o2sensor 7-TB sensor 12-egr 23-knock sensor. anybody have any idea on this? thanks ray

Re:all my sensors are acting up, any idea?
 

Your MAP sensor is reading boost, so your computer is most likely limping. Got a Missing Link or check valves? Mine did the same until I put a new Link in.

Re:all my sensors are acting up, any idea?
 

no no no He is using the AFC hense doesnt need nor want a missing link or check valves. I think it has something to do with your afc settings.. what are they.. all the settings, fuel %'s, high/low throttle pos, sensors. everything, list them ALL.

make sure the sensor type is set to pressure and is 06/06.

Re:all my sensors are acting up, any idea?
 

I have no chech valve or missing link.
1 2 3 4 5 6 7 rpm
high 0 +1 +1 +1 +1 +1 +1
low 0 +1 +1 +1 +1 +1 +1 th-point lo 98 high 99

Hot wire 1 in, 1 out \
sensor check 1in: 2.8v. 2 in: .06v, thrt:0.44v
every thing else I left alone. as soon as I start to hit boost, engine light comes on. while engine light is on, and no matter how hard I'm on the gas at 4000 rpm the car sputters. and lots of black smoke. oh yea the pressure is the same as the hotwire 1 in 1 out. thanks

Re:all my sensors are acting up, any idea?
 

those are weird settings..

shouldnt it be like...

rpm low hi
1k -37% -36%
2k -36% -36%
3k -35% -35%
4k -34% -34%
5k -34% -34%

etc...

something with percentages?? this is the Apexi S-AFC right??

Re:all my sensors are acting up, any idea?
 

yea this is a apexi afc. if I set it up that far in the neg it seems like it bogs the car with too much fuel.

Re:all my sensors are acting up, any idea?
 

you have it at +1 %??!!?!?.

Im not trying to put you down, but do you know what those changes even do? +/- % ?? Before you take this any further you need to unnderstand why you make changes.

Re:all my sensors are acting up, any idea?
 

yea I know what it does, I know +1 should be right. cause before I swapped in a new motor. my turbo f22a I had it atrpm low hi
1k -37% -36%
2k -36% -36%
3k -35% -35%
4k -34% -34%
5k -34% -34% and the car ran great, now If I set it like that, the car slowly shuts off. like Iam over loading it with fuel. but If i keep it at 0 the car idles and runs fine until I hit boost. than thats when it run like ----.

Re:all my sensors are acting up, any idea?
 

hey bro, i dont really know about the rest of whats going on with your car, but i do know this... if you are running +1 you should be WAY rich. i cant see your car, so i dunno for sure. what i can tell you is that with that setting, your ecu is definitely seeing boost. the whole purpose of the hack is to run big injectors, and LOWER THE MAP VOLTAGE(ex:-36%) SO THAT YOUR ECU WILL NOT SEE BOOST. at the settings you are at, you are not taking advantage of the hack. in fact, at + or - only 1%, you might as well not even use a safc because the setting will be basically stock. try and get a a/f gauge to give you a ballpark figure of where you are at - i bet you are full rich at all times. good luck, hope that helps.

Re:all my sensors are acting up, any idea?
 

yah...

-35% is richer then -38%.

so... -15% is WAY richer then -35%. and +1% is just craziness.!!

Re:all my sensors are acting up, any idea?
 

ok here is what i did, I switched the afc setting back to -30 across the board. The car runs a lot better no sputtering at 4000 rpm, no engine light, but the car is running rich. when I start the car the a/f gage is in the orange witch is stoch, than it slowly goes in to red witch is lean. than the a/f gage reads nothing, no lights at all. so I can't depend on that gage. but i see black smoke coming out of the pipe. so i know i'm no lean, is there a nother way I check my a/f? thnaks crx88si, quickcrx702 ;) you guys helped alot

Re:all my sensors are acting up, any idea?
 

an EGT (exhaust gas temp) works too, hotter means leaner.

-30 is also still pretty rich, but until you have a good way of viewing a/f ratio it can't hurt.


btw.. did u let the car warm up... o2 won't work til its warm.

Re:all my sensors are acting up, any idea?
 

i'll look in to getting one of those EGT gages. I still have a little sputtering at 4000 rpm. not nearly as bad as it was. do you think it would have to with those seceondary buter flys on the intake manifold? because I have the vaccum unpluged to the butter flys, cause I have no plug for the solenoid. and no I didn't let the 02 warm up. thanks again Ray

Re:all my sensors are acting up, any idea?
 

still some sputtering? try -31% -32%but with a big h23 I wouldnt go much leaner then that.

o2 needs to reach 600F. Wont do that in the first 10 seconds of warm up.

Re:all my sensors are acting up, any idea?
 

just out of curiousity, what is the stock flow rating in cc of prelude injectors? you should find this out. right now, i am not turbo yet. however, let me give you an example. stock injectors for my car flow at 240cc, while dsm blue tops flow at 450cc. taking away 46% of the fuel would yield 243cc, which is basically stock. i have this set all the way across right now because i am not turbo. however, if i were turbo, my setting at idle would start out at -46%, and gradually increase as my turbo starts spooling. basically, i would slowly add fuel from -46% to like -35% depending on factors like how much boost i am running, and what rpm my turbo starts to spool at. if your stock injectors flow at 300cc(im just taking a guess, i dont know what prelude injectors flow at), you would start out at -33%(301.5cc), and gradually richen the mixture to something like -25%, taking into account all of the conditions of your setup. when you find out exactly what your stock injectors flow at, just do the math and figure out how much you need to lean out and richen your fuel.

Re:all my sensors are acting up, any idea?
 

Not really sure on what the stock cc's are. I Have dsm 450cc in right now, as soon as I get teh stock flow rate, I can get my afc a little closer yet. also I had a the engine light come on, and it was a knock sensor, where and what is a knock sensor? when the knock seneor came on the car ran really rough. CRXSI88: I let the 02 sensor warm up but still no reading on the meter. The only time I see anything is when I first start the car, than it drops off and nothing. thanks Ray

Re:all my sensors are acting up, any idea?
 

u must have the a/f guage hooked up wrong.

Re:all my sensors are acting up, any idea?
 

i just read this.. dont know if it applies to the h23 at all..but i bet the stock lude injectors aren't 240cc

Prelude VTEC Peak and Hold 345cc
Prelude VTEC H22 Saturated 280cc
how can i find out if my injectors are peak and hold or saturated???

In order for the afc hack to work properly w/ map scaling you will need larger then 450cc injectors I think.

when u get to around 6psi I bet u will throw a cel because for proper tuning w/ 450cc injectors u will only be scaling it down to -25%.

Also with the base lude injectors being larger (345cc) you are leaning out (causing your knock).

I think, for this setup to run fine and dandy you will need 720cc injectors if indeed your stock injectors are 385cc.

Anyone have some insight to this?

Re:all my sensors are acting up, any idea?
 

the injectors in the h23 were 240cc I was told. and there are peak and hold injectors. yea when I hit boost the code does pop up. a guy on honda-tech told me this.

(i don;t think its you sensor, there is something wrong with your fuel delivers. from what i have read the h23 has 240 for injectors and when you do the afc hack with 450 you sould be runing -40 on the low end to -35 on the high end, -30 is to rich and may not be limitin the map signal enough and thats why your throwing the map code. ask in the FI board, but i would try the settings i recommended. thats you problem: fuel , not your sensor, right now you have to finish getting the proper settings so that you can "trick" the ecu into being happy. also make sure you afc is wired correctly.)

Re:all my sensors are acting up, any idea?
 

1992-1996 prelude w/vtec (h23 right?) has 345cc injectors.. see here...

http://www.turbomagazine.com/tech/0303tur_sawp/

Re:all my sensors are acting up, any idea?
 

yea I have an h23 but there not vtec, I think the 345cc are h22 vtec, I have the afc -40 across the board and still throwing map and knock sensor, but the car makes no pinging noise. and after you get by the sputtering, the car spools,pulls and runs good. its just like 3500 to 4000 rpm. is when the rough running starts. but when the turbo spools, no sputtering. since I did swap the h23 in the old f22 spot, and the f22 had no knock sensor. there is a spot I think, right above the oil filter where it feels like theres a plug there, but I have no wires to go to it. is that where the knock sensor should go?

Re:all my sensors are acting up, any idea?
 

im not sure about the knock sensor.

when does boost start to kick in on your car?

if you start adding fuel before it starts spoolin' then that will run super rich and sputter..


example...
RPM PSI AFC
1k 0 -40
2k 2 -37
3k 4 -35
4k 6 -33
5k 6 -32
6k 9 -30

kinda like that..

you canb't just dump -30% from 2-8k RPM with different levels of boost. This is why you need to dyno tune w/ a wideband o2 for accuracy.

Re:all my sensors are acting up, any idea?
 

hey bro, if (and only IF) your base injector flow is 345cc, then i would have my settings something like this...

1k -23% (346.5cc's, only 1.5 more than stock)
2k -20%
3k -18%
4k -16%
5k -15%
6k -14%
7k -14%

im just taking a guess after the 1k setting, but im just trying to give you an idea of where you need to be. depending on the type of turbo that you are using(BIG or small?), you may want to change those values a little bit. for example, i wouldn't richen the fuel mixture much before the turbo starts spooling. if it starts to spool at 3k, thats where i would start to richen the mixture. if it started to die out in the higher rpms, i would stop raising the fuel. but like crx88si said, the dyno is the only real way of finding out exactly what settings are best for you. good luck my friend.

oh ----...my bad. when i first put the settings up, i had my math wrong. its correct now. however, with these settings, im not sure it will be negative enough to please your map sensor. you MAY have to use larger injectors.

Re:all my sensors are acting up, any idea?
 

thank all of you for all the help you have given me. I will take it to a dyno as soon as I find one that know what there are doing. I regapped my plugw yesterday, they were all fucked up, one was at .20 one was .35 the other two were like .60. so i gapped them at .40. ran the car no sputtering, no engine light but I only ran the car a little. so do you think teh plugs could have caused my problems. thanks ray

Re:all my sensors are acting up, any idea?
 

that was part of your problem. the settings on your afc also posed an equal problem. before when you had those funky settings (+1) it probably compounded the problem. if i were you i would still try messing with your settings and seeing what works best for you. but yeah, your plugs seemed pretty fucked up... good catch by the way.