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.

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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.

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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.

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kermit_rr said:

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

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Arctic2 said:

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

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kermit_rr said:

Have you tried unplugging the maf?

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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?

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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.

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BWV said:

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.

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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?

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BWV said:

Hello all, update, of a sort.
I had the calibration done and have a copy of the report if anyone is interested. My car definitely seems smoother and consumption has dropped by about 5%...
She still smokes like hell on drop down or hard load... my new mechanic reckons it may be my EGR. It is not working correctly and has been blanked off, but with no delete done. The codes my car throws up are related to the valve not opening or closing and he thinks my fueling may be adapting because of this? I can get a working second hand EGR for a reasonable price, is it better to have an ecu delet done, or replace with a working unit? Any suggestions welcome.

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Nodge68 said:

How are the boost hoses?
Any splits or leaks at joints will cause black smoke.

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Nodge68 said:

The ECM doesn't learn values after a replacement is fitted, because it doesn't know a replacement is fitted, hence the need for an air path calibration.
JLR, PSA and Ford all list an air path calibration as in integral part of work required when replacing a MAF.

Yes it can make a big difference to how the engine runs, which is why it's supposed to be done.

The air path calibration can even be done as part of routine servicing, as it will calibrate the ECM to aging sensors.

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• Idle (2–5 g/s): ~0.5–1.5 V.
• Cruising (10–20 g/s): ~2.0–3.0 V.
• High Load (30–50 g/s): ~3.5–4.5 V.

nodger said:

Good evening, all.

I don't mean to hijack this thread, but I have a very similar issue here with my 2008 Freelander 2 TD4.

I don't have any black smoke issues, and the car is well-serviced and otherwise seems to be running quite well for its age. I noticed that fuel consumption has crept up to 10.7L/100KM (about 26MPG) so I did some searches online and found out how to test the MAF. I back-probed it with a multimeter and the voltage readings were all over the place, so I replaced it with a Pierburg 7.22184.24.0 and checked the readings with a newly acquired OBD2 reader. It was showing 12.8g/s at idle, 55g/s cruising around 2000RPM, and maybe 120g/s under load at 3000RPM, which seems significantly out of spec based on what I had found online:

Voltage Output (Signal): Analog, ~0.5–4.5 V.

• Idle (2–5 g/s): ~0.5–1.5 V.
• Cruising (10–20 g/s): ~2.0–3.0 V.
• High Load (30–50 g/s): ~3.5–4.5 V.

I had access to a Bosch '0 986 280 703' model MAF, which is also supposed to be compatible with MHK501040 specifications, but it gave very similar results... 13g/s idling at 790RPM.

@Nodge68 I saw your recommendation about the air path recalibration elsewhere, so I queried this with my local LR specialist and he said they never do them for MAF replacements; only for "throttle, EGR and turbo actuator", but that they could try doing a recalibration if I want to. Is there any way to have the ECM recalibrate itself through a battery disconnect, or using OBD2 apps, or is this something that absolutely must be done by an LR mechanic? I trust the mechanic completely - I'm just weighing the cost of the labour against the cost of the extra fuel consumption

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BWV said:

Hijacking welcome!
I have since replaced my EGR with a known working unit, and replaced my last two injectors in the same condition. My car still smokes black under load, and I am convinced my MAF readings are too high.... no one can tell me what they're supposed to be. I'm 13 on idle, and 35 to 70 under any load.....
My last two lines to explore are now O2 sensor and something seriously wrong in blowback (fuel pump or something worse)

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