I know this is a common topic and I've browsed a good number of threads but not as yet found one with the same symptons (or a cure!)

Its a 2006 1.6 110hp diesel belonging to my niece that won't pull the skin off a rice pudding. I volunteered to get it going better and so far have:

- cleaned out the DPF off the car - differential pressure readings now circa 2 KPa at tickover to 15 - 20 KPa when accelerating hard. I think this is ok but have seen conflicting views on what are good numbers

- made sure the VNT actuation system is not seized up - it moves freely when pushed and you can see the vacuum system operating when you start the car and accelerate

- blanked the EGR

Currently I'm getting a max MAP pressure of about 150 KPa under full load and from what I read this should be between 200 - 250 KPa - so lack of boost equals lack of power.  The interesting thing is that MAP pressure actually reduces below atmospheric pressure when you initially rev the engine which I didn't think should happen with a diesel engine - I''ve seen readings of 70 -80KPa on FORscan.

I've had an intermittent P0299 DTC that can be cleared and does not always reappear despite the low boost. It does have a P2458 DPF regeneration DTC that I can't get rid of.

Does anyone have any bright ideas where to go next?

- do you think the MAP sensor is faulty?
- is there a throttle valve issue restricting the inlet system? On Forscan the TPMODE goes to PT when accelerating and CT off throttle
- do I have a broken turbo or do I need to look at the DPF again?

All bright ideas welcome as we're running low on inspiration...

Many thanks

 

 

 

Quick update re the above in case its useful info for others in the future.

I changed the pneumatic valve that operates the VNT mechanism but no joy

Was then thinking that although the vacuum side was working maybe the internal vane mechanism inside the turbo could be sticking before closing fully so pulled the turbo off and opened it up.

Then found the VNT mechanism was very loose and that you could pull some of the pins out that operate the vanes ie they weren't connected to anything.

Removed the VNT ring (for info 2 out of 3 of the little torx studs snapped even with heat applied - not sure if its possible to remove these without snapping them) to find there were no vanes left in the turbo, hence the lack of boost!

Replaced the turbo with a Chinese one bought off ebay (fingers crossed) and power now restored 😀

Just a quick follow up re the above:

- the car has performed well over the last couple of months but its now intermitently going into limp mode.

- Forscan suggests this is due to a DPF ash accumulation error

- DPF values still as above - ie circa 2kpA at tickover and 15 - 20kpa when accelerating

- I'm also seeing a SEC_TPDC value that sits at 0 - 3% 

Could anyone confirm:-

1. What would be typical differential pressure values for a good working DPF

2. What the SEC_TPDC relates too? Does the low value mean I have a sensor fault or is it just a result of the car being in limp mode.

Many thanks

 

Just had similar problems with my daughters 2010 Kuga 2.0 TDci

In the end we got the dpf deleted. Car has been much better, more power and more mpg.

On 7/10/2024 at 1:04 PM, unofix said:

Is it time I just accept that the DPF needs to be replaced on my daughters Kuga 2010 ? (Mileage 68000)

The car has now gone in to limp mode, will not rev above 3000rpm and has the "Engine Malfunction" warning on.

Checked it out today with FORScan and it seems the soot level in the DPF is 'full' and is warning against just doing a static regen. I cleared the codes but it soon returns. Below are some screen shoots of the DTC's and the live data. Should I just replace the DPF ?

Any recommendations on replacement brands or suppliers would be welcome.  Ford finis 1869463

Kuga - DTC 10-07-2024 (1).txt 13.03 kB · 4 downloads Kuga - DTC 10-07-2024 (2).txt 4.03 kB · 2 downloads

 

45 minutes ago, Salmonfield said:

What would be typical differential pressure values for a good working DPF

For a new car 0.1 kPa at Idle, maybe 0.2 or 0.3 as the car gets older and no more than about 3 or 4 kPa when driving.

I've no idea what SEC_TPDC is.