Hondata

Hi there

I got one major problem all the time.
The car i have is civic '94 B16A2 with JRSC equipped and S200 with boost (rom editor V4 etc).
The car runs just great when it is tuned in open loop. But when i switch to closed loop it just dies and AF ratio goes up to 19. I did tried to change my o2 narrow band sensor but problem still exist. Even if i tune my idle to around 15:1 i still get hicckups (hesitations), especially in light load (throttle). I am affraid that AF ratio changes (to lean) in full throttle runs too. that is why i drive it in open loop all the time, but fuel consumtion goes up a lot.

Any suggestions???

PS: There is nothing changed with my wire harness and WBo2 sensor i have plugged in extra hole on the exhaust so it can not mess with narrowband output.

What vehicle is this in?

civic 3dr, year 1994 with B16A2 swap.

Sounds like something may be wired incorrectly. You may also have a bad o2 sensor or the incorrect o2 sensor. Use process of elimination to narrow down where the problem lies. Youse a frineds car to swap things into.

Hello EITCP,

It's seems that I have the same problem... Everything ok in open loop and then when switching in closed loop, the short term compensate to about +20% fuel... Like my map is really too lean at idle and column 1... but in open loop I am at 14.7...

Did you find something about this problem?

Thanks

Hello EITCP,

I was fooled by the fact to entry my wideband signal in the O2 input. I had all tuned in open loop everythink ok but when swith in closed loop it was around 30% too lean column 1 and 2 and 20% 3 and 4 and so on till 8% too lean at WOT. (not boosted)

So if you made the same mistake as me, re-do a map and when swith to closed that should be Ok

Gil