'96 gsr
440cc RCs
VAFC set at -35% across the board.
hi lo set @ 71%/72%
fuel pressure at 42 w/ hose off
turbo @ 7psi

When i stomp on the gas say at 2500rpm my autometer AF stays lean. What the hell is going on. The injectors also seem to cut off when i'm cruising at <5% throttle. Could my map sensor be jacked? Any ideas?

 

@ idle, what's it doing?

Have you tried say -33%, and been successful w/o throwing any CEL's? Resistor box?

jB

 

I think the injectors do shut off to save fuel if you are moving at speed but have full vacuum, like when you are going down a hill. Autometer A/F gauges aren't really that accurate, but hell try -30%.

 

yah you cnt just set it to -35 and be done you have to tune it...start playing with the numbers if it reads lean then fattin it up above 2500 rpm's and see how it runs! mine goes rich when i hit WOT........and autometer air/fuel ratio gagues SUCK!!! they are pretty useless.........do you have a afc or vafc??? if its a afc connect the blue wire to the o2 wire and read it off that....its accurate.


[Modified by boostinb18, 3:19 AM 10/3/2002]

 

I have the VAFC. Do you think i'm pumping too much fuel causing it to misfire and jack up the readings on the AF meter? 440cc minus 35% shouldn't cause a lean condition do you think?

 

u have an egt guage?

 

Yeah I would think -35% would be plenty. Check the throttle position sensor, maybe you're not going into open loop. If it was too much fuel you'd hear backfires.

 

how is it that the whole hi/lo setting should be put?????

 

No egt....i will check the TPS. I installed the VAFC yesterday and the rest of the setup today. All was well yesterday so it's not the VAFC install. Grrrrrrrrrrrr

 

do you have a fuel pump?

 

Yeap fuel pump.
New data! While at a stop, if i rev the engine to exactly 2k the motor will act like its hitting fuel cutoff. It will buck and the rpms will drop a little. If i rev pass to 2500rpm it will attempt to drop back to 2k. I can rev pass that to say 4k and it will be fine. What the hell is happening at 2k? Before 2k the motor acts fine. I think whatevers happening at 2k is causing me to lean out up top also.

 

try resetting the ecu and the afc. re-input the settings then.
also, try looking at the afc sensor check... make sure thigns seem alright


[Modified by zojirushi, 12:19 AM 10/3/2002]

 

Give me your AFC sensor readings. Mine are:

pressure 0.8-0.9
TPS .45-.49
CDS 4.5~

 

do you have all the AFC settings correct? Pressure sensor...6in and 6out?

 

Yea make sure you have all the settings right, -35% shoudl be more then enough fuel, do you have a walbro intank or what? check out my tuned setup, I added hella fuel right around 3-4000rpms, car was starving around there, but then again before 4300 I'm not at full boost so thats probably why the 14.?? A/F mixture I was getting, who knows.... more I added fuel down there though the more torque I got sooner

 

is it a inline pump??? did you remove the check valves and fmu?? do it if you havent and a inline pump will mess stuff up! and it wont rev past 2000 rpm........ check your connections on the vafc, and reset your ecu(disconnect negative battery terminal).......and if it doesnt work try -40% from 2000 up.
good luck

 

are you throwing any CELs? That sounds like my car when I kept getting an IACV CEL (because of a bent throttle plate). Also, when I first installed my VAFC, I accidentally cut into the signal for the IACV (it was like the same color wire as some other one but reversed ie: red/black vs black/red or something like that) and so my car would do the same thing at around 2k rpm. Either that or timing for the 2k "fuel cut".

 

-I'll double check the VAFC wiring.
-I have a 255lph intank walbro
-The car seems to cut the injectors off if the throttle drops blow 5% open. I can't cruise at 3% throttle positon, it's like i let off the gas at anything below 5%...
-No CEL at all. Even when in boost
-All check valves and missing links are uninstalled. Map is installed. *maybe the o ring is not sealing!* Is a pressure voltage of 0.8-0.9 good at idle?
-I can't seem to get the static fuel pressure below 42psi, is this normal?


Anyone in Va willing to help me?

[Modified by speedymon, 7:25 AM 10/3/2002]


[Modified by speedymon, 7:37 AM 10/3/2002]

 

im having the same prob on my D16Z6 civic, also my car starts very badly, surely someone knows how to resolve this

deacs

 

It's a normal 'quirk' with the AFC hack. I had it also..

You say you have 440's and you set the idle for -35%? That's awful rich, I had the idle setting on my Civic at about -45% to get the car to idle normal without dumping tons of fuel, same on a friends B16 hatch. Richen up the later part of the fuel map (where it goes lean) as much as you can before you throw a code. For me on 10psi, I couldn't get it richer than about -37% before it gave me a CEL, becuase you're running less boost you might be able to go a little further.

BTW, don't forget you're running 10:1 comp., I'd stay under 7psi if I were you. My friend had a few spikes at 9-10psi on his B16 with the AFC hack, wound up killing of of the cylinders! One of the few times my little 9.6:1 CR D16 had an advatnage


[Modified by VTC_slow_CiViC, 10:22 AM 10/3/2002]

 

Ok the AFC hack is working alright for me. I'm boostin and not going lean. I reset the ecu and initialized the AFC and started over. It seemed to get better! I still have the fuel cutoff feeling at low throttle position. What the hell is that?

 

That would be... fuel cutoff at low throttle position. You don't notice the transition in and out of cutoff with stock injectors because they regulate small amounts of fuel better. Search on this problem, someone came up with a way to adjust this out either by moving the throttle stop or by adjusting the TPS.

 

what would i search under to find that??? i would also like to fix this.......the transition is very noticable on the 450's!

 

i dunno if this is what ur talking about but on the drop shop website... it says to sait the throttle thingy to 98/99 %

 

it actually doesnt matter because the narrow and wide throotle settings are the same!!! so when you hit 99% or what ever it wil change to the same setting therefor it does not matter!