2.0 tdci dpf issues..... - Exhausts / Induction (Mk4 Mondeo) - TalkFord.com

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2.0 tdci dpf issues.....


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#1 toola

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Posted 26 February 2021 - 08:20 PM

Evening!

 

I've picked up a 58 plate mondeo 2.0 tdci cheap, but with some issues..... I've managed to sort all but the parking sensors and DPF so far, but getting stuck with the dpf at the moment. So looking for some help!

 

The car: 2.0TDCi titanium X mk4, 141k. No history with it, was being offloaded by a local trader as they'd taken it in p/x. I've got Forscan with bluetooth ELM327 and laptop, no hs/ms switch. Awaiting usb modified ELM327.

 

Initially had P2002 fault code with EML. 0kPa on DPF pressure sensor at idle and under load. Checked the sensor by applying vacuum, hey presto Forscan showing a pressure. Checked under the car, one of the pressure hoses completely split, as per other posts. Replaced hoses today, now reading a pressure difference at idle, increasing under load. Didn't record the pressures, can check them again later if it helps.

 

I expected that the dpf would not have performed a regen for a while, as by the look of the pressure hose it had been munched for some time. So I cleared the DTCs, reset DPF learned values and took the car out for a drive up the motorway hoping it would start a regen. Got a couple of miles from home and got a "diesel filter overloaded" warning on convers+, followed shortly by EML & limp mode. Never had limp mode with EML for P2002. New codes are:

- P2463

- P242F

- P244B.

 

Reset DTC's, they came straight back straight away.

 

Got home reset DTCs, tried to do a static regen. No change in RPM, sat at idle for 10 minutes so presumed it had failed. Tried again, same thing. Tried the P242B clearing trick (disconnect MAF), then started static regen - wahey...revs up to 3k+! Lasted 5 minutes before getting the "diesel filter overloaded". So no luck with the static regen...

 

So where next? Any help greatly appreciated!



#2 Squirt

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Posted 26 February 2021 - 09:39 PM

What is the DPF pressure at idle and 3000 rpm?
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#3 toola

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Posted 27 February 2021 - 09:56 AM

Engine off ignition on : 0kpa
Idle : 0.8kpa
3k rpm : 7-8 kpa


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#4 toola

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Posted 27 February 2021 - 02:10 PM

Also threw an egr code this morning - can’t remember exactly the code, but have had the egr off (absolute pig of a job to get to the third bolt 😩😩) . Egr was pretty well caked and wouldn’t fully close, so have cleaned it up. Nicely freed up and closes fully. Now back on the car, ready for whatever is next!

#5 steffenbk

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Posted 04 March 2021 - 12:41 PM

Also threw an egr code this morning - can’t remember exactly the code, but have had the egr off (absolute pig of a job to get to the third bolt ) . Egr was pretty well caked and wouldn’t fully close, so have cleaned it up. Nicely freed up and closes fully. Now back on the car, ready for whatever is next!

So you know the EGR opens and closes properly? If you do an EGR modul reset it is pretty easy to hear. If it makes a "bzzz"(kinda like a hydraulic lift or something similar) its good, but if there is a clicking noice its bad.



#6 toola

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Posted 04 March 2021 - 01:59 PM

I’m going to say no....

Off the car, the mechanism was a bit strange. I was expecting one smooth motion through the full range. In fact, it was like it was a two stage motion, and it would sit around half way - but it was a smooth and unrestricted motion to fully closed and fully open. On the car it clicks away like a good’un after engine off. But it isn’t throwing any codes any more.

I did manage to do a static regen, got really hot and held high revs for the duration. No more dpf codes and nothing on convers+, so assuming it was successful.

Think a replacement egr might be wise


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#7 steffenbk

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Posted 04 March 2021 - 04:16 PM

Think a replacement egr might be wise


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If you're gonna buy one, see if you can find a Delphi valve they're pretty relaibale. I have had two Triscan EGR valve both new and doa.. and heard multiple people on the facebook group im in having the same issue.


Edited by steffenbk, 04 March 2021 - 04:16 PM.


#8 Squirt

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Posted 04 March 2021 - 07:54 PM

I’m going to say no....
Off the car, the mechanism was a bit strange. I was expecting one smooth motion through the full range. In fact, it was like it was a two stage motion, and it would sit around half way - but it was a smooth and unrestricted motion to fully closed and fully open. On the car it clicks away like a good’un after engine off. But it isn’t throwing any codes any more.
I did manage to do a static regen, got really hot and held high revs for the duration. No more dpf codes and nothing on convers+, so assuming it was successful.
Think a replacement egr might be wise
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Your DPF values were good (assuming the sensor is reading correct) so should have rgenerated correctly. Make sure the coolant temperature reads 80 - 90 degrees when warm and driving as below this will stop regenerations. Resetting the DPF values is not recommended if your not certain the DPF isn’t blocked and healthy and most likely caused the problems trying to regenerate as the car needs to see a learned value.
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#9 toola

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Posted 06 March 2021 - 05:06 PM

Thanks for your help.

Checked coolant temperatures, they are 65-75 when driving. I warmed the engine up before heading out, radiator seemed to get warm with coolant temp ~70.

Changed the coolant temperature sensor in case it was bad, no change.

Gauge fluctuates from just under quarter to just under halfway at a steady 70 on the motorway.

Guessing these numbers aren’t normal?


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Edited by toola, 06 March 2021 - 05:07 PM.





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