[Solved] Mercedes Sprinter 906 (318 CDi) - Error 2624, MAF Sensor Issue, Offset Drift, Boost Pressure

Hello colleagues
In Sprinter 906 318 CDi I have error 2624 which is described as MAF sensor, offset drift with engine under load.
I can't delete it. I already replaced the flowmeter with a new one, nothing helped. Maybe something else is causing this error. Please advise.
Regards

Once again, I read the errors with texa and a completely different description comes out, i.e. the deviation of the boost pressure at load. However, after deleting, a message about the boost pressure actuator (2510-01) appeared and this is where the problem lies.

Did you calibrate it after replacing the flow meter? Just like injections, the air mass sensor, throttle and a few others must be entered through the "start" option (that's probably what it's called).
Without training, errors will pop up.

I cleaned the geometry on the turbine and installed the turbine actuator repair kit. It runs fine now (no bugs).

However, I still have one question. It doesn't start on a cold engine, you have to spin it for 2 minutes, and it's just starting to catch on. Then it goes off a few more times and I stain again until it goes, but you have to wait 1 minute. because it does not respond to gas. There are no errors, what could be the reason? It only happens on a cold engine. The fuel pump gives a pressure of approx. 180 bar at start-up. Have any ideas? Maybe injections, but a bit of a strange symptom for them.

wary2 wrote:

The fuel pump gives a pressure of approx. 180 bar at start-up.

A bit too little rather.

I noticed that on the starting cables the pressure immediately jumps to approx. 250-320 bar, already at 200 the engine starts. But it still fires up and goes out again and again, behavior like a diesel with air.

What should the rail pressure be when cranking the starter?
Strangely, now I walk to the car and it fired from the first time. I tried a few times and it burned, after a while it stopped again, it just fires up and goes out. Pre-pump pressure around 2.5 - 3.5.

Surprisingly, this morning it fired the first time, walked nicely, etc. I turned it off and it did not fire the second time. It's strange, because he doesn't even want to be in the square.
Now I have mastered how to disconnect the flow meter, it burns without any problems every time. There is 450 mg on the disconnected air flow meter, 220 mg on the connected one. I'll order a new one tomorrow and let you know how it goes.

The starting problem was caused by a faulty fuel flow control valve on the high pressure pump.
There was no need to calibrate the flow meter.

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