Not a Transit but the same Ford 2.2tdci

[lightning]

lt's the inferred soot level that shoots up within 10 miles. The DPF guy said that the ECU estimates soot levels based on driving style and other parameters such as fuel/air ratio.

l've monitored the differential pressure and it's within the normal range at all speeds. The regeneration when it occurs is successful (EGT 600degC, soot level down to zero)

During the next 10-20 miles the soot level barely reaches 1 (regeneration normally occurs at around 20) but the inferred soot level gets up to over 80%, triggering another regeneration.

The DPF guy spent half an hour messing with it and said the fault was "before the DPF".

[lightning]

So here's something.

Yesterday l put a bottle of injector cleaner into the tank, and it's made a noticeable difference. l no longer get the wierd Sssshhhhwwww noise as l accelerate and it's done 40 miles without regenerating so far.

So what's next, four new injectors?

[metalworker0]

Put in more injector cleaner

Run down to less than half a tank, then put it in so its stronger

A garage mechanic told me 4 months ago , "car plan" injector cleaner was the best he had ever used

When got home ,could not find it on the google

But did find this

"CarPlan’s sister brand Carlube (both owned by Tetrosyl) manufactures the primary fuel and injector cleaning additives often associated with the CarPlan name, such as the Carlube Petrol Injector Cleaner 300ml."

so perhaps he meant carlube, there is a diesel one

all the best.mark

[lightning]

Just an update on this.

My local Land Rover specialist didn't know what the fault was, and another specialist never called me back. So it was down to just trying things.

Before the expensive option of replacing the DPF l replaced the MAF and MAP sensors. l also used some injector cleaner.

There's definitely an improvement, but l don't know which of the three improved it.

Before, the "inferred soot mass" both open and closed loop jumped up to over 80% within a few miles, 10-20 miles from a regeneration and it was back to 85%.

Now, the "open loop" reading slowly creeps up and the "closed loop" goes up and down with driving. The DPF regeneration has gone to around 100 miles between regenerations.

My new 2022 Defender regeneration occurred about every 100 miles during town driving so it's probably about right. l've not been on a longer run yet but will see how it goes.

[metalworker0]

Did i mention putting a boroscope into the dpf via the sensor hole .. to see whats going on .. it could be blocked and just regenerating in the centre .. if it returns to its old ways i would look at this .

certain engine oils block DPFs too .. you must have one marked as low SAPS for running with these DPFs

all the best.. mark

[MagsH72]

Fair enough, but tbh I'd have tried the cheap bottle of cleaner first too... mustn't grumble if it works.