First of all, a bit of a noob here. So, my wording may not be as technical. Sorry!

I had a cleaned second hand DPF + regeneration fluid put in three months ago, after an owner I bought the car from had the DPF taken out & switched off.

I had the EGR blocked with a blanking plate two months ago. The car jerked like crazy, and this solved the problem.

Now, the question is...

Do you have any idea how long I could drive with the EGR blanked before any issues with the DPF arise?

I was told that I should take out the DPF if I have the EGR blanked, and that within two months the DPF would be totally clogged.

It's been two months, and the car is not jerking almost at all, but in the 4th, 5th and 6th gear, when at around 2000 rpm and soft on the pedal, the ride is not exactly 100% smooth... You can feel the tiniest jerk a bit. Nothing major, but feels like the beginning of something.

Do y'all think this could have anything to do with the DPF getting clogged?

I understand nothing, but whenever I floor it (and the turbocharger switched on), the exhaust fumes that come out of the exhaust are really clean. I baaaarely see a trace of the black smoke, in traffic or when idling. As in, I literally have to park next to a white wall (in neutral) and when I floor it, I can see the tiniest amount of black smoke.

What y'all think?



(ps. vis-a-vis the jerking: a new MAF sensor had been installed too).

It all depends how you drive the car. If you drive a lot of small trips the DPF will clog no matter what.
If you drive long stretches you will never get any issues. I drove my 406 2.0 hdi for 350000 miles on the same dpf. Only refilled the eolys once.
Never blanked off the egr though. Because it is there for a reason.
Hope it helps you a little.

 

It all depends how you drive the car. If you drive a lot of small trips the DPF will clog no matter what.
If you drive long stretches you will never get any issues. I drove my 406 2.0 hdi for 350000 miles on the same dpf. Only refilled the eolys once.
Never blanked off the egr though. Because it is there for a reason.
Hope it helps you a little.

Thanks.
I'm the first guy that likes to have everything as it should be. That's why I had the DPF put back in.
But unfortunately, after hundreds and hundreds of Euros down the drain while searching for the problem of it having jerked all the time, I just didn't have another 400 Euros for the EGR to be changed, so I opted out to have it blanked for no more than 7 Euros. Shame on me. But times are tough. :/

 

I was told that I should take out the DPF if I have the EGR blanked, and that within two months the DPF would be totally clogged.

You were told wrong.

If you're worried about your DPF, get an ODB device and some quality software which talks to the car and picks up the soot load in the DPF. There's a couple of good Android ones.

When you reinstalled your DPF system, did you get the counters reset and the car's ECU reprogrammed to include the DPF again?

And do all the other components needed for a regen work OK? There are quite a few - additive pump, fuel cap sensor, cooling fan to name but three.

 

I'd like to believe that everything has been reset and everything is in working order, but I might need to double check that. The car underwent the hugest service two months ago (as in, every bolt had been checked), but not sure if the DPF is still mapped out. I'm assuming that the mechanic would have done that when installing the DPF and when the official Peugeot service refilled the regeneration fluid, but I'll go check. Thanks!

 

The EGR functions to reduce NOx emissions. It does this by inserting inert exhaust gases back into the engine. That reduction in oxygen causes less NOx emissions. However in doing so, the fuel does not burn as efficiently, causing more particulate matter (smoke).

EGR also causes the cylinder temperature to decrease (which causes less NOx as well). This will cause the turbocharger to be slightly less efficient.

However on the Peugeot engines with EOLYS, blanking an EGR alone will not cause any issues for DPF regeneration. High Air / Fuel ratio and higher cylinder temps are a good thing for DPF regeneration.

Personally, if the engineers designed the system properly to take exhaust gases AFTER the DPF (so clean air), I would recommend leaving it in.

As advised before you have to make sure the vehicle has not been remapped to remove the DPF functions - do this URGENTLY.

How was the old DPF removed? Did they drill a hole through it or removed completely? A removed DPF would put the engine light on!

 

The EGR functions to reduce NOx emissions. It does this by inserting inert exhaust gases back into the engine. That reduction in oxygen causes less NOx emissions. However in doing so, the fuel does not burn as efficiently, causing more particulate matter (smoke).

EGR also causes the cylinder temperature to decrease (which causes less NOx as well). This will cause the turbocharger to be slightly less efficient.

However on the Peugeot engines with EOLYS, blanking an EGR alone will not cause any issues for DPF regeneration. High Air / Fuel ratio and higher cylinder temps are a good thing for DPF regeneration.

Personally, if the engineers designed the system properly to take exhaust gases AFTER the DPF (so clean air), I would recommend leaving it in.

As advised before you have to make sure the vehicle has not been remapped to remove the DPF functions - do this URGENTLY.

How was the old DPF removed? Did they drill a hole through it or removed completely? A removed DPF would put the engine light on!

First, thanks for such a detailed reply. I really appreciate this.
There were no lights on the dashboard when I bought the car & upon inspection, the mechanic said the DPF had been removed completely.
But I'm unclear as to whether they have remapped it back again so that get the DPF functions back on once they have reinstalled the DPF and refilled the regeneration liquid.
So, in other words, you're saying that, if the DPF functions have not been remapped back to how it's supposed to be, the physical DPF and the regeneration liquid I put in are technically doing nothing?
When you say URGENTLY have that checked - can I harm the vehicle in any way if the car remains in the "DPF mapped off" mode? (This is just out of curiosity).
As said, I'll get this all checked ASAP.
Thanks again!

 

No problems, when you switch the ignition on, does the orange engine warning light turn on and off as normal? Some unscrupulous people take the instrument panel out and put a bit of tape over the engine light so it does not illuminate.

If the DPF functions have not been remapped back in, then yes, the fluid has been doing nothing as it most likely has not been injected into the system. It all depends on how the person remapped it out and of course, impossible to tell.

I misread something, you've had the DPF on the car for 3 months. Crucial part is, how many miles have you done since DPF was fitted?

Yes, the replacement DPF will be working, collecting soot as normal. If the car does not regenerate the DPF, it will clog up... but the car will not warn you. Eventually it will block up and that's when it can cause some serious damage.

 

No problems, when you switch the ignition on, does the orange engine warning light turn on and off as normal? Some unscrupulous people take the instrument panel out and put a bit of tape over the engine light so it does not illuminate.

If the DPF functions have not been remapped back in, then yes, the fluid has been doing nothing as it most likely has not been injected into the system. It all depends on how the person remapped it out and of course, impossible to tell.

I misread something, you've had the DPF on the car for 3 months. Crucial part is, how many miles have you done since DPF was fitted?

Yes, the replacement DPF will be working, collecting soot as normal. If the car does not regenerate the DPF, it will clog up... but the car will not warn you. Eventually it will block up and that's when it can cause some serious damage.

Eternally grateful for your help!

When I switch the ignition on, the orange engine warning light does turn on, then off, as normal.
So far, I've done around 4000 miles with the DPF in. 2000 miles before the EGR was blanked, and 2000 after.
It's been 50/50 highway/city.

Anyway, I'm such a doofus lol... I'm assuming now I gotta go visit the Peugeot service and get it hooked to the PP2000 yet again lol to see if the DPF is regenerating with the liquid. I'm assuming in normal circumstances it should be warning me that the DPF is clogged?

Although, now that I think about it, it should have also warned me that the canister for the regeneration liquid is empty, and it didn't do that. The mechanic saw that it was empty by physically inspecting it, yet there was nothing on the dashboard telling me so. Which leads me to believe that the DPF is NOT mapped in.

Ah man... This has been my dream car since I was a kid, but since it's my first car I knew absolutely nothing about all of this, so I had no idea what to pay attention to while it was being serviced and hooked up to all sorts of diagnostics so many times. Oh well... onwards and upwards!

 

The EOLYS fluid tank (Regen liquid) does not have a level sensor. It only knows if it's full or empty by doing calculations of how much fluid was in there (programmed with PP2000) and subtracting the amount injected every time you fill up with diesel. You can easily fool the system by telling it you've refilled it when you haven't.... or it was injecting too much every time and it ran out before it should have done.

If your DPF wasn't regenerating, it should be totally blocked up by 4000 miles so it does seem to be regenerating. However that might be passive.

Do you have anybody nearby who has the diagbox / pp2000 system, it would be much cheaper than going back to the peugeot dealer for simple things!

 

The EOLYS fluid tank (Regen liquid) does not have a level sensor. It only knows if it's full or empty by doing calculations of how much fluid was in there (programmed with PP2000) and subtracting the amount injected every time you fill up with diesel. You can easily fool the system by telling it you've refilled it when you haven't.... or it was injecting too much every time and it ran out before it should have done.

If your DPF wasn't regenerating, it should be totally blocked up by 4000 miles so it does seem to be regenerating. However that might be passive.

Do you have anybody nearby who has the diagbox / pp2000 system, it would be much cheaper than going back to the peugeot dealer for simple things!

You're right - could be passive. Plus, I always tank with the more expensive diesel (with additives). I'll make a few calls and find someone with Diagbox / PP2000 ASAP. I'm scared that the DPF might still be remapped, and that the car maybe didn't go into limp mode when it should have, and that the minor jerking is a sign of something wrong. I'll most definitely keep you posted. Thanks for everything & talk to you soon. Cheers!