my car is running really rich on idle - up in the greens on the lambdalink and a bit of black smoke.

is there any sensors i can check ?

have put in a new O2 sensor - no change

Car is runing an Apexi PowerFC

doesn't seem to be going closed loop ? ?
Or am i talking rubbish !

Iain.

 

What does the MAF read at warm idle Iain ?

Andy

 

I'll check the controller tomorrow Andy

thanks

 

My car running rich at idle too! Especially when the engine is cold, you can see the unburnt fuel coming from exhaust. I checked to see the actual AFR readings at idle - Closed loop 14.7, Open Loop: 12.80 - MAF readings 1100 mv

 

Andy - when warm about 1500 mv


what should it be ? ?

 

Are those AFR values when cold, closed loop sounds fine? Would expect to see unburnt fuel coming out of the exhaust.... black smoke???? Open loop is off (if warm), was the car mapped in open loop for cruise and idle tho?

What are your WTR Temp settings?

Tony.

 

Sounds like your maf may have gone Iain. They should be IRO 1300mv warm idle.
When the maf fails it loses its range ie it reads too high and runs rich at idle and reads low and runs dangerously lean when on power.

That would explain why the ECU can't get closed loop under control at idle.

Andy

 

Sonica, do you actually get black smoke ? or are you referring to the whiteish condensation mist ?
As Tony said, your closed loop figure is bang on and open loop is acceptable for a cold engine.

Andy

 

Thanks Andy

I'll be driving like miss daisy for a coupla days then untill i can get a New one !

a bit worrying that it was on the rollers sat at 306 / 319 ! !

 

Tony, no mappers in here so I'm trying to optimize my own PFC. No black smoke, but whiteish smoke when cold.

Today I checked it again with a warmed engine. It reads 12.20 in open loop mode and the car starts to vibrate in a while at idle. I have never tried to change any cells of the fuel map because i dont belive that I'm using the right settings for MAF and injector scalings. It seems afr readings at high revs and loads are quite fine.

 

Good Call Andy

New maf fitted - back to closed loop on idle - 1295mV when warm

Car runs Much nicer now

cheers

Iain

 

Nice one Iain

Andy