HELP, CAR SUDDENLY GOT LEAN

[Faraz_Shaikh]

Hello experts
ive installed turbo kit in my yaris 1szfe, boost im running is 0.5 bar, couple of weeks back car suddenly got lean, afr is 14, i hear knock sound as boost comes, ive done all efforts, changed the fuel pump, serviced the injectors, fpr is set to 60psi, fpr was set to same before too, i did nothing but suddenly one day i started hearing knock, when i checked the afr it was 14.
Ive even reset the ecu, to control the fueling i am using fcon mini, ive checked that as well but can find no problem in it, i am attaching the pic of fcon as well. kindly help me
http://a1.sphotos.ak.fbcdn.net/hphotos-ak-snc6/200372_10150423643810088_655640087_17779425_254226 3_n.jpg
http://a4.sphotos.ak.fbcdn.net/hphotos-ak-snc6/189026_10150423644155088_655640087_17779429_396198 1_n.jpg

[Yoda]

what do you mean by serviced the injectors? had them flow tested? have you tried to add more fuel with the fcon? Are you sure you are hearing engine knock?

[cali yaris]

How are you monitoring air/fuel ratio in real time?

[Faraz_Shaikh]

k

[Faraz_Shaikh]

yes thats the engine knock, and flow of injectors have been checked its perfect, i just dont check afr all the time, once its tuned its checked, and then it runs ok for the rest of time

[cali yaris]

I asked "how" you monitor the AFR

[Yoda]

Check if your maf is dirty. Do you have a gauge in your car which u can use to monitor your a/f?

[Attitude]

folks
today i even installed injectors of 4efte, 300cc, and fpr was set to 60psi but still knock was there. now i think there is something wrong with ecu

[ilikerice]

ok.. so you hear a knocking noise.. could this also be a rod knock? a video would be helpful.. and i think people are asking you if you have a A/F guage to see it lean out on your dash.. do you have one of these? and at what rpm/boost is it leaning out?

[cali yaris]

If he's not going to answer simple questions = I can't be helpful at all. Sorry!

[Attitude]

no i'm not having an afr gauge, i borrowed from one of my friend to check the afr and it was 13 to 14. The car gets lean as the boost comes, if i slightly push the peddle(dont let the boost come) so there isnt any knock.

[Attitude]

car leans out as the the boost comes, at around 3000 to 3500

[ilikerice]

sounds like a tunning issue more then anything. are you using a wideband a/f sensor? i would suggest getting a A/F guage and permently installing that for your benifit. are you able to pull up your map via laptop? im not familiar with fcon.

[cali yaris]

today i even installed injectors of 4efte, 300cc, and fpr was set to 60psi but still knock was there. now i think there is something wrong with ecu

Assuming the parts you've installed were installed correctly and are working properly, you have a tuning problem. That set up should provide more than enough fuel.

How do the plugs look? Post a closeup of a spark plug.

[Faraz_Shaikh]

ive just installed new plugs of zex, now i have installed injectors of 4efte which are 300cc, the car is rich on idle man, it gives black smoke but as boost comes while driving, knock is heard, yes i am planning to buy a/f sensor with gauge in a month or so, but the shocking thing is the car was running perfect on same setup infact with small injectors of 225cc and suddenly it created this problem, i am just wondering if anyone is having the diagram of fcon mini, the nuts on it are not giving any hint that what are its functions.

[ilikerice]

just a thought.. could it have been bad gas you may have gotten? are you still running on the same tank of gas still? just a thought that crossed my mind. other then that, im helpless

[cali yaris]

the car was running perfect on same setup infact with small injectors of 225cc

Then why did you change the size? :iono:

[Focus_Sh1ft]

Just a thought, since I'm not entirely sure if this works both ways...

When you installed new plugs, did you install a plug with a larger gap? I know going from larger to smaller gap means you're going to have less of a complete burn, hence a richer mixture. So that implies going from smaller to larger would provide a more complete burn and be potentially leaner.

[ilikerice]

^good point also

[Faraz_Shaikh]

@cali , just to check if it could solve the prb
@ili, dude ive refilled the tank for like 9 to 10 times since this prob
@focus dude i did not jumped to smaller plugs, i just installed a new set of zex, which i was using earlier as well

[cali yaris]

When you are trying to fix something, you make one change at a time. If that change doesn't fix it, you put it back the way it was.

Otherwise, you have no idea if the new change will cause a new problem or add to the old problem.

[Blown_xa]

does that engine management utilize an onboard or external map sensor? If so, sounds like it went bad and the tune is stuck at 0 psi (for example). If you had the tuning software you can hook up the laptop and know immediately.

[Attitude]

i dont have any such thing :(

[cali yaris]

There is no "fcon mini" on the HKS website. Who made it?

How is the management wired into the car?
What map is in it, and how did it get there?

[Attitude]

fcon mini is not available in market, it only comes with turbo kits of hks and made for specific engines, its written scp10 on the top of my fcon, if ill put it on 1nzfe it wont work, i found the wiring map on a Russian website then i translated, i still cant find its map anywhere, i just see some nuts in the fcon, when i put them right or left the car goes lean or rich, there are 10 nuts in it, cant find their functions

[ilikerice]

can i possibley suggest a new/different type of engine management?

[cali yaris]

+1 million million million