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[Entwood]

Had the odd "grump" when idling over the last day or so, especially when sat in traffic queues, so took some live data this morning, from cold and all without touching the throttle.

Engine off

IAT 8C SHRTFT1 0.0 % SHRTFT2 0.0 %  LONGFT1 4.7 %  LONGFT2 2.3%

No stored or pending codes in either Engine or Transmission

Start Engine - Running on petrol

Open Loop RPM 982, MAF 8.75 g/s  FuelSys1 goes closed loop after 2.1 minutes, Fuelsys2 goes closed loop after 1.3 minutes ETC 24C

At ETC 50C system switches to LPG, next data is all on LPG

ETC 50C  SHRTFT1 2.3 - 6.3 % SHRTFT2 7.8 - 11.7 % LONGFT1 4.7% LONGFT2 2.3 % RPM 781 MAF 5.75 g/s

ETC 65C SHRTFT1 3.9 - 4.3 % SHRTFT2 7.0 - 8.6 % LONGFT1 4.7% LONGFT2 2.3 % RPM 707 MAF 5.0 g/s

ETC 85C SHRTFT1 0.8 - -1.6% SHRTFT2 0.0 - -0.8 % LONGFT1 4.7%  LONGFT2 2.3% RPM 650 MAF 4.25 g/s

Questions then for those who know - as I certainly don't ! - 

a) Are these figures reasonable ??
b) Long Fuel trims bank 2 are half those of bank 1 - is this normal ?
c) Short Fuel trims bank 2 are consistently higher than bank one - is this normal

If the answers to to any of the above are "no", what could be the problem, is it serious, what is the solution ??

Is there normally a difference in the time each bank switches to "closed loop"

Any advice gratefully accepted

[feeutfo]

The difference fuel trim between banks is not uncommon. Mine does it. As do others with the same kit. Afaik.

Injector times are different too, proportionately. Not sure what the cause is. I tried swapping the outlets from the vap to different banks, and the issue remained unchanged. So I think its something the car is seeing. In balance between o2's maybe. On mine ...well I'll check. Hang on.

[feeutfo]

Ltft bank 1. + 1.6
Ltft bank 2. + 2.3

Not much if an error. But on petrol it would be zero.

[Entwood]

Ltft bank 1. + 1.6
Ltft bank 2. + 2.3

Not much if an error. But on petrol it would be zero.

Thanks .. might have a play with it on petrol tomorrow, see what it comes up with As long as it don't look serious 

[car5car]

The difference fuel trim between banks is not uncommon. Mine does it. As do others with the same kit. Afaik.

Injector times are different too, proportionately. Not sure what the cause is. I tried swapping the outlets from the vap to different banks, and the issue remained unchanged. So I think its something the car is seeing. In balance between o2's maybe. On mine ...well I'll check. Hang on.

dying O2 sensor, slower responce.
Check O2 sensor voltages, if sensors are not wide band, you'll see difference. If engine idles, only O2 sensors command fuel delivery change.

[feeutfo]

O2's are new.

Lpg software shows their activity.