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DPF Regen 2.2 TXS 4.5

3K views 28 replies 9 participants last post by  SteveyG 
#1 ·
How do i know when my DPF is doing a regen on my 2011 2.2 TXS estate,i don't seem to have any problems at the moment and the car is used 75% of the time for 100 mile + journeys,on occasions at cruising speeds i accelerate and it has a very slight "hicup" for a second then won't do it again for ages,would this be when it is doing a regen? There is no smoke out the back and the car performs faultlessly and has done for the past 9k miles since i have owned it.
 
#2 ·
Sounds like the car is doing it perfectly. You shouldnt really notice when it does a regen, its suppose to be passive
 
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#4 ·
Thanks for the response guys,it seems it's doing it's stuff then,i have also noticed from time to time when i pull up on the drive there is a lot of heat coming from the exhausts and a bit of a whiff but only noticed this 3 times,perhaps it was just finishing/finished a regen when i turned it off?
 
#5 ·
You shut it off during a regen or just as it was done. if you want to know 100% when the car is performing a regen then wire an indicator led from the vaporiser glowplug relay and as long as the LED is lit a regen is taking place :).

I think there is a post here somewhere on how to build this.
 
#6 ·
Thanks for the response guys,it seems it's doing it's stuff then,i have also noticed from time to time when i pull up on the drive there is a lot of heat coming from the exhausts and a bit of a whiff but only noticed this 3 times,perhaps it was just finishing/finished a regen when i turned it off?
Thats normally a sign its either doing a regen or just done one. Best way to check is when the engine is warm see what it idles at. When it does a regen and you are idling it should sit about 200rpm more
 
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#7 · (Edited by Moderator)
Thanks for the response guys,it seems it's doing it's stuff then,i have also noticed from time to time when i pull up on the drive there is a lot of heat coming from the exhausts and a bit of a whiff but only noticed this 3 times,perhaps it was just finishing/finished a regen when i turned it off?
Thats normally a sign its either doing a regen or just done one. Best way to check is when the engine is warm see what it idles at. When it does a regen and you are idling it should sit about 200rpm more
That's not the case on the Mk4.5, it'll idle at normal revs as it has a different regen mechanism to the Mk4.

I can't say I've ever noticed a hiccup when a regen is taking place as the only difference is the DPF injector starts fuelling the DPF - the engine should remain unaffected, I would suspect something else.
 
#8 ·
I have 2 MK4.5 2.0 TDCi so I know for sure how the car feels during a regen , you can feel it if you know what to look for , a small hesitition during acceleration the first second , can sometimes feel like the car has more power , a deeper tone from exhaust , higher fuel consumption on trip computer , EGR valve fully closed and so on....
 
#9 ·
I have 2 MK4.5 2.0 TDCi so I know for sure how the car feels during a regen , you can feel it if you know what to look for , a small hesitition during acceleration the first second , can sometimes feel like the car has more power , a deeper tone from exhaust , higher fuel consumption on trip computer , EGR valve fully closed and so on....
Deeper exhaust note for sure, but on the 2.2 at least, the performance is the same and there shouldn't be any hesitation.
 
#10 ·
I spotted some smoke in the rear view mirror after exiting a roundabout, thought it

was odd and checked the soot loadings to find it had dropped and the exhaust temp

was still fairly high.

I take it the later cars with the vaporizer dont need to maintain a certain speed to

do a regen.
 
#13 ·
It will have a vaporiser. Why do you want to do a forced regen? You shouldn't need to do one unless the car is having problems and giving out error codes for failed regens. Thing is, if it's failed due to temps being too low during normal driving then the chances are that the vaporiser is blocked and a forced regen won't work.

Note: Forced regen may cause a lot of smoke and will rev your engine (can't remember to what revs) so will be noisy.
 
#14 ·
If the soot loadings are too high a static regen is not recommended also.

I assumed it needed to be a set speed because my car failed a regen as i hit roadworks

on the motorway and the speed dropped to 30mph.

Few days later I warmed the car up reset the soot loadings and took it for a drive up the

dual carriageway and it did its own regen as the soot load increased on the forscan software.

Odd that my regen failed then. Never done it since.

I was doing a lot of stop start journeys the day before though, helping someone move and it

was less than a mile each way. Lots of journeys back and forth.
 
#15 ·
My 2.2tdci mk4.5 mondeo had a new dpf and vaporiser valve fitted over a year ago. I wired up the led so I know when it's doing a regen.

Lately my car is doing regens all the time. I did a 70 mile round trip the other week. On the way there the car did one regen and on the way home it did 2. Also sometimes when it's going a regen it chucks some smoke out the back.

I always have a P code fault saying the dpf is faulty.
 
#16 ·
Cheap aftermarket unit? Is it completing the regen or failing due to low temperatures

or other issue?
 
#18 ·
Get it mapped out, that will sort it
 
#22 ·
Yep, they tightened up on the rules recently also.

Any smoke emitted it should fail. If the DPF or CAT has been removed it should fail. If the

DPF or CAT looks like its been tampered with it should fail.

But an MOT tester cannot fail what he cannot see, if said item is covered with a shield they

cannot remove it.
 
#24 ·
unlikely as there will be some visible smoke in most cases, and whilst the tester cant remove anything to check the presence of the DPF they can easily check the tailpipe which should be soot free.

as for signs of tampering, not entirely sure how that could be enforced if its been repaired by welding a plate on to prevent an exhaust gas leak, for example. it would be difficult to prove in either direction (unless the repair was filmed of course, in 1 non stop, unedited video!)
 
#25 ·
So when dpfs are removed and the map for the car has been altered. Would the car stillgo through q emissions test.
Some crisp £20 notes in a brown Inland Revenue envelope under the left hand bin before

presenting the vehicle for testing. Congratulations your deathtrap passed.
 
#26 ·
So when dpfs are removed and the map for the car has been altered. Would the car stillgo through q emissions test.
Some crisp £20 notes in a brown Inland Revenue envelope under the left hand bin before

presenting the vehicle for testing. Congratulations your deathtrap passed.
removing a DPF hardly makes it a deathtrap, even though id not consider it myself.

had we been talking blobs of filler hiding rust holes where seatbelts or suspension mounted, then maybe, but removing a DPF is like saying that these noisy exhausts automatically change a perfectly safe car into a deathtrap. and almost EVERY Subaru has one of those, its almost compulsory. so do we fail all them too? (and for the record its the main reason i HATE Subarus!)
 
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