FN2 won't work with any MAF calibration (running extremely lean)

[rattinger]

Hello!

Here is the problem:

Car is 2010 CW Civic Type R with following modifications:
- custom made 4-2-1 header
- 2.5" exhaust with no cat (secondary O2 sensor removed also)
- RRC intake with stock air box K&N installed

Car was tuned with MAP Calibration on dyno making ~225 hp.

Car worked pretty fine, but fuel consumption was quite high and it didn't work very fine on part throttle (thoughts based on "Ass-dyno" and engine sounds).

Problem is: now i'm trying to return to MAF-calibrations (which should be used instead of map-calibrations), but car won't work at all with any MAF-calibration.

Right after start S.term starts to rise until reaches 47% and A/F goes up to 18-20 ! In other words, car is running very very lean.

If I touch to throttle pedal, car dies immediately.

I have already tried new stock wideband O2-sensor, new MAF-sensor and many different MAF-baset calibrations, including N Group Reflash.

I think that it can't be air leak, because it works with MAP-calibrations?

I haven't yet tried to unlock ECU and returning it to stock.

Also if it would matter, I also mention that tried once also Asian version FD2 map (made fault codes)

(sorry for bad language, hope you understand :)

[Spunkster]

Try returning the ECU to stock, but do not unlock it and see if it will run with that.

[rattinger]

Thanks for reply

I've already tried that

[Spunkster]

If it does not run with the return to stock then there is some issue with the vehicle that needs to be addressed.

[rattinger]

When using MAF-calibrations I get following values on idle:

Cold engine:
RPM 1300rpm
MAP 410 mBar
AFM.v 1,33 V
AFM 4,3 g/s
AFC.c 100 mg
S.Trim 47%
A/F 19,20

Even when engine not running AFM values are:
AFM.v 0,76 - 0,84
AFM 0,57 - 0,82 g/s
AFM.c 0 mg

Are those values correct?

[rattinger]

Any advice? Anybody?

[tctc]

Hello!

Here is the problem:

Car is 2010 CW Civic Type R with following modifications:
- custom made 4-2-1 header
- 2.5" exhaust with no cat (secondary O2 sensor removed also)
- RRC intake with stock air box K&N installed

Car was tuned with MAP Calibration on dyno making ~225 hp.

Car worked pretty fine, but fuel consumption was quite high and it didn't work very fine on part throttle (thoughts based on "Ass-dyno" and engine sounds).

Problem is: now i'm trying to return to MAF-calibrations (which should be used instead of map-calibrations), but car won't work at all with any MAF-calibration.

Right after start S.term starts to rise until reaches 47% and A/F goes up to 18-20 ! In other words, car is running very very lean.

If I touch to throttle pedal, car dies immediately.

I have already tried new stock wideband O2-sensor, new MAF-sensor and many different MAF-baset calibrations, including N Group Reflash.

I think that it can't be air leak, because it works with MAP-calibrations?

I haven't yet tried to unlock ECU and returning it to stock.

Also if it would matter, I also mention that tried once also Asian version FD2 map (made fault codes)

(sorry for bad language, hope you understand :)

Hi, were you able to fix this? I have the same problem. Return to stock doesn't help.

[tctc]

If it does not run with the return to stock then there is some issue with the vehicle that needs to be addressed.

Factory reset doesn't work either. I tried disconnecting the battery for a while - no result. Short-term correction of about 30% and sluggish response to the pedal. How to reset the factory firmware?

[Spunkster]

To return to stock, go to the online menu and click on return to stock.

[tctc]

To return to stock, go to the online menu and click on return to stock.

I did this, the result is the same as I described above.

[Spunkster]

Then there appears to be a mechanical or wiring related issue with your vehicle.