Just another DPF thread

369 Views 17 Replies 6 Participants Last post by Micky R, 6 d ago

DriveHangry

Discussion Starter · 8 d ago (Edited)

Hello all,
I understand the DPF issue has been probably spoken like beating a dead horse, but i have come across an interesting issue with mine (first time in 100k km).

My 2012 2.2 d-tec (2011 bodystyle for most, with around 400k km) has started doing dpf regens with little to no "warning" (e.g. i can only tell once i stop the car from the fans going and the burning smell). In winter the signs were very clear, but in summer, now, i really can't tell easily. Well, last night i assume the regen started just before i got home, and this morning when I went to start the car, the car cranked maybe 2-3 seconds long than normal, then smelled to high hell of diesel exhaust until the engine warmed up. Once warm the vehicle then "started" regen and the more normal symptoms came on.

My question is, can this be normal phenomenon? Could it be that when the regen starts, the vehicle dumps fuel, and that unburned fuel is causing the long crank and fumes? The electric system has tested good and there are no other Fuel issues present, which leads me to believe this is a random anomaly of the DPF regen system.

Just a side note this vehicle is regularly driven at 130km/h (80ish-mph), so i would think there shouldnt be too many issues for dpf regen.

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UK-Kev

· #2 · 8 d ago (Edited)

No error codes or warning lights sounds to me that your DPF system is doing what is it is supposed to do. And as for dumping fuel into the engine this is a normal part of the DPF cycle unless you have a problem with leaking injectors.

Question for you - See attached Honda TSB - Has you CRV had this update?

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DriveHangry

Discussion Starter · #3 · 8 d ago

UK-Kev said:
No error codes or warning lights sounds to me that your DPF system is doing what is it is supposed to do. And as for dumping fuel into the engine this is a normal part of the DPF cycle unless you have a problem with leaking injectors.

Question for you - See attached Honda TSB - Has you CRV had this update?

Hello,
Thank you for the reply, it is very helpful. I am, however, wondering if this fuel pump would be responsible for the hard/prolonged starting. As for the TSB, i believe mine has had it taken care of, as I have never seen any DPF light or warning indicator in the time I've owned it. But i do know the oil level increases a fair bit before and shortly after the regen.

UK-Kev

· #4 · 8 d ago

If you are concerned about prolonged starting, you need to check your fuel rail pressures.

Also is your battery in good condition.

Is your oil changed and filter and servicing done at the required scheduled periods.

When was the last time you had your fuel filter changed.

What manufacture of diesel are you using – Honda engines run best on named manufactured fuels.

The increase in oil is the normal event cycle of the DPF system, hence the reason why you should adhere to the service periods.

If you CRV is increasing the oil prior to doing an regen then you may have an issue with one or more of your injector and it may pay you to get an injector leak back test conducted, also this could be the reason for hard starting.

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DriveHangry

Discussion Starter · #5 · 8 d ago

UK-Kev said:
If you are concerned about prolonged starting, you need to check your fuel rail pressures.

Also is your battery in good condition.

Is your oil changed and filter and servicing done at the required scheduled periods.

When was the last time you had your fuel filter changed.

What manufacture of diesel are you using – Honda engines run best on named manufactured fuels.

The increase in oil is the normal event cycle of the DPF system, hence the reason why you should adhere to the service periods.

If you CRV is increasing the oil prior to doing an regen then you may have an issue with one or more of your injector and it may pay you to get an injector leak back test conducted, also this could be the reason for hard starting.

Hello,
Thank you for the response. All has been checked and serviced by Honda (battery tested slightly low, but nothing concerning). Gas is Neste or She'll, both of which are good quality. The issue is only persists when the vehicle is shit off long term when the regen first starts. That is why I am thinking if it could be the cause. Plus the strong phumes until warm.

Whoever mentioned and deleted the dpf delete comment, doing so will make the vehicle not road legal under Finland's road acts.

TheDarkKnight

· #6 · 8 d ago

DriveHangry said:
Whoever mentioned and deleted the dpf delete comment, doing so will make the vehicle not road legal under Finland's road acts.

That comment was removed due to being a "smart" spam bot that creates pseudo-responses from existing thread content.

AI for ya!

Reactions: 2

UK-Kev

· #7 · 8 d ago (Edited)

I must be honest I have not kept up with all the different diesel fuels in recent years, but I believe Neste fuels are aviation based fuels and as such falls into the JP8 section of the ISO standard – All diesel fuels sold in Europe must conform to EN590 However I am aware that Neste fuel’s use a high Certane number, thus on this point it should be good for fuel economy.

Moving on and with reference you your comments could you clarify being shut off for long term and strong plumes until warm! Does this mean you have excessive smoke emissions until your engine reaches working temperature – And please note I do not understand your comment engine shut off for long time.

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DriveHangry

Discussion Starter · #8 · 8 d ago (Edited)

UK-Kev said:
I must be honest I have not kept up with all the different diesel fuels in recent years, but I believe Neste fuels are aviation based fuels and as such falls into the JP8 section of the ISO standard – All diesel fuels sold in Europe must conform to EN590 However I am aware that Neste fuel’s use a high Certane number, thus on this point it should be good for fuel economy.

Moving on and with reference you your comments could you clarify being shut off for long term and strong plumes until warm! Does this mean you have excessive smoke emissions until your engine reaches working temperature – And please note I do not understand your comment engine shut off for long time.

Hello,
Apologies for any confusion, my phone is not so nice with its word-guessing auto-correcting. In terms of the engine being shut off, i mean that the vehicle will be out of use for more than 12 hours (engine shut off/down). I've only encountered the delayed starting issue when the DPF starts and the vehicle is shut down and out of use soon after, without completing the cycle. As for the "plumes" i meant fumes/emissions (rogue auto correct), basically the car smells like heavy exhaust until warm, then goes into the typical burning rubber smell that the dpf usually produces. Again, this only occurs when the vehicle is shut off during the DPF regen and has a delay when re starting 12+ hours later.

I should also add in, this was an exceptional case, as there were absolutely no signs the regen started or was in progress before shutting the car off, the only way i know it happened was how the car restarted the next day and the fact it stayed at a steady 20L/100km for 10 minutes, before giving the normal DPF smell and normal mpg.

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UK-Kev

· #9 · 8 d ago

Okay big TIP regarding starting an i-dtec engine when it has been standing for prolong periods of time. When you first turn the key on do NOT rotate the engine and watch the glow plug light, when the glow plug goes out turn the key off and straight back on until the glow plug goes out for a second time and attempt start sequence……….. Try this and let me know how this goes for you.
Okay I think I understand your fumes problems now – Do you have a cracked EGR pipe – See attached information.

Reactions: 2

DriveHangry

Discussion Starter · #10 · 8 d ago

UK-Kev said:
Okay big TIP regarding starting an i-dtec engine when it has been standing for prolong periods of time. When you first turn the key on do NOT rotate the engine and watch the glow plug light, when the glow plug goes out turn the key off and straight back on until the glow plug goes out for a second time and attempt start sequence……….. Try this and let me know how this goes for you.
Okay I think I understand your fumes problems now – Do you have a cracked EGR pipe – See attached information.

Hello,
Thanks for the tip, this is actually what the dealer suggested doing when the temps went below -20c, so perhaps it will be a good habit.

As for the EGR pipe, it was cracked, but was replaced 6 months ago at the dealer. When it was cracked the regen was very clear by regularly making the exhaust fumes noticable in the cabin, increased turbo noise during regen and and would many time make smoke visible from the drivers wheel well during regen.

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SaxClar

· #11 · 7 d ago

UK-Kev said:
Okay I think I understand your fumes problems now – Do you have a cracked EGR pipe – See attached information.

Thanks @UK-Kev ! I'll have this information stored and waiting when my CRV meets the EGR pipe problem.
Appreciate!

Reactions: 2

TheDarkKnight

· #12 · 7 d ago

No question, @UK-Kev is an absolute legend!

UK-Kev

· #13 · 7 d ago

TheDarkKnight said:
No question, @UK-Kev is an absolute legend!

Stop it you are making me blush..... lol

Reactions: 3

Micky R

· #14 · 7 d ago

Interesting thread, thanks.
Do Gen 3 diesels have a dashboard indication that regen is occurring?
Does the DPF "self-clean" on long motorway runs i.e. cleans without regen?

Black Pearl UK

· #15 · 7 d ago

Micky R said:
Interesting thread, thanks.
Do Gen 3 diesels have a dashboard indication that regen is occurring?
Does the DPF "self-clean" on long motorway runs i.e. cleans without regen?

Just to pour salt in wounds, my gen3 doesn't have a dpf fitted 🥰 and it is the sole reason I still own it 🤣🤣

TheDarkKnight

· #16 · 6 d ago

Micky R said:
Do Gen 3 diesels have a dashboard indication that regen is occurring?

Only the i-DTEC models.

The earlier pre-facelift ones have no DPF and are i-CTDI engines.

UK-Kev

· #17 · 6 d ago

@Micky R
Regarding your questions -
1/ Do Gen 3 diesels have a dashboard indication that regen is occurring? No
2/ Does the DPF "self-clean" on long motorway runs i.e. cleans without regen? The DPF self-cleans when the required parameters are reached and can be any time and does not necessarily have to be on motorways.

Please see the attached pdf showing the pages from the owner’s manual and the explanation.

Reactions: 2

Micky R

· #18 · 6 d ago

Thanks for the replies. My last three daily drivers have been DPF diesels, approx 350k total miles across all three, I was never aware of DPF regen on any of them, but most of my mileage was (generally) free-flowing m/way and dual carriageway.

Reactions: 1

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