Freelander 2 TD4 MAF values needed.

BWV · Wednesday at 10:32

Good day all FL2 owners!
Is there anyone out there who has the MAF values for the above engine?
I have two brand new MAF's and both read differently, and very different from another TD4 who's readings I compared to.
I have tried everywhere with very little luck, A.I. says I should be at around 2,2g/s on idle, and around 25 at 2500; my car is showing 13 at idle and 55 at 2000...
She is throwing a lot of black smoke under load, and the consumption is up, and power feels a bit down.
Any help would be greatly appreciated.

Arctic2 · Wednesday at 12:12

Black smoke you say check the little hose connected to to the throttle body for a split, if that is ok check the lower hose going to the intercooler on the same route.

The MAF would most likely cause a limp home mode, if it was that much out.

1

BWV · Thursday at 11:00

Arctic2 said:
Black smoke you say check the little hose connected to to the throttle body for a split, if that is ok check the lower hose going to the intercooler on the same route.

The MAF would most likely cause a limp home mode, if it was that much out.

1

Thanks for this... my readings seems pretty close.
As for intercooler hoses, I have been through all of them and they check out fine.
I am trying to find someone here who can do a calibration on air and fuel path to rule that out, otherwise it looks like it's pointing to faulty injectors.

Nodge68 · Thursday at 13:26

BWV said:
Good day all FL2 owners!
Is there anyone out there who has the MAF values for the above engine?
I have two brand new MAF's and both read differently, and very different from another TD4 who's readings I compared to.
I have tried everywhere with very little luck, A.I. says I should be at around 2,2g/s on idle, and around 25 at 2500; my car is showing 13 at idle and 55 at 2000...
She is throwing a lot of black smoke under load, and the consumption is up, and power feels a bit down.
Any help would be greatly appreciated.

Have you done an air path calibration? The ECM calculates the MAF values during the calibration. Not doing a calibration will give MAF read variations, which the calibration irons out.

BWV · Thursday at 13:33

Nodge68 said:
Have you done an air path calibration? The ECM calculates the MAF values during the calibration. Not doing a calibration will give MAF read variations, which the calibration irons out.

Both my independent LR workshops here have said it isn't needed, that after "resetting", it learns as it goes. I am in disagreement after reading various threads here so I am looking into other options to get it done.
I have had MAF sensor and fuel injectors replaced.
Can not doing the calibrating have a very noticeable effect? Maybe this can explain the smoking and slightly reduced performance?

kermit_rr · Thursday at 14:17

13g at idle is wrong and probably telling the ecu to dump piles of fuel into the engine, hence the smoke

BWV · Thursday at 14:22

kermit_rr said:
13g at idle is wrong and probably telling the ecu to dump piles of fuel into the engine, hence the smoke

This has been my suspicion for a while now, too high a reading and fuel being applied to that mass, way over fuelling.
It jumps up to over 60 when putting your down.... with smoke to match
Will try that calibration and see if it brings things the readings down.... as soon as I can convince a mechanic that it actually needs doing.

kermit_rr · Thursday at 15:11

Have you tried unplugging the maf?

Arctic2 · Friday at 00:13

I wonder if the south African heat would make any difference to MAF readings i doubt but you just never know.

kermit_rr · Friday at 07:50

Arctic2 said:
I wonder if the south African heat would make any difference to MAF readings i doubt but you just never know.

Marginally, like a cold intake has a marginal impact. Altitude would have a much bigger impact, in my opinion, but the other way

BWV · Friday at 08:32

kermit_rr said:
Have you tried unplugging the maf?

There is no noticeable difference in the engine with the maf unplugged... which is a bit surprising. This is one of the reasons I think I may still have injector issues, but wanted to cross the maf off the list first.

Nodge68 · Friday at 17:43

BWV said:
Both my independent LR workshops here have said it isn't needed, that after "resetting", it learns as it goes. I am in disagreement after reading various threads here so I am looking into other options to get it done.
I have had MAF sensor and fuel injectors replaced.
Can not doing the calibrating have a very noticeable effect? Maybe this can explain the smoking and slightly reduced performance?

If any part of the air intake system is changed, including sensors and valves, then an air path calibration MUST be carried out. Not doing so will mean the ECM doesn't have a datum point to start monitoring the air going through the system. There is a small variation in all sensors, which is the reason the air path calibration is so important.
Additionally the ECM MUST have new injectors coded to it, again to eliminate manufacturing tolerances. All injectors have an an alphanumeric number on them, which must be input into the ECM using suitable diagnostic equipment, or the fueling will be off.

These engines run on a very sophisticated and rather fussy injection system, so everything must be set up correctly, or it'll never run at optimum performance levels.

BWV · Friday at 21:35

Nodge68 said:
If any part of the air intake system is changed, including sensors and valves, then an air path calibration MUST be carried out. Not doing so will mean the ECM doesn't have a datum point to start monitoring the air going through the system. There is a small variation in all sensors, which is the reason the air path calibration is so important.
Additionally the ECM MUST have new injectors coded to it, again to eliminate manufacturing tolerances. All injectors have an an alphanumeric number on them, which must be input into the ECM using suitable diagnostic equipment, or the fueling will be off.

These engines run on a very sophisticated and rather fussy injection system, so everything must be set up correctly, or it'll never run at optimum performance levels.

Thanks very much for that. I think I'm closer to finding someone to do the calibration, hoping to get it done next week, and very much hoping to have her back to where she used to be.

Freelander 2 TD4 MAF values needed.

BWV

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Arctic2

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BWV

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Nodge68

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BWV

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kermit_rr

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BWV

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kermit_rr

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Arctic2

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kermit_rr

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BWV

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Nodge68

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BWV

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