2.2 HDi The Next Generation

[Doggy]

I caught the DPF regen on PP2k this morning.

Took about 1.5 minutes to get up to temperature, then 9.5 to do the regen. Happened at the worst possible moment, as usual. (I have an LED to go into the mirror but haven't soldered it in yet.)

I know I said March for the defap, but the DMF is getting noisy (I knew it would be to do, but it's irritating that it needs doing straight away) and bills galore arrived at the start of the year so the defap has moved down the list of priorities.

You have my sympathy. I well remember getting attuned to the Dogmobile's FAPPing about, (you could hear the hrw relay close every time you put your foot on the accelerator) and you just know every time you lift off, it's another aborted regen edging you nearer to the precipice....

What would the Victorians have made of it?

Annual income average, no particle filter, result - happiness
Annual income < Bill Gates, with particle filter, result - misery

You don't need and LED in your mirror, you need an empty space in your DPF housing.

[Welly]

So how'd you know it's doing as regen again? some clickerage from a relay? or anything more obvious.

That's a great idea about an LED, that way you can jump on it and keep the speed up so it can finish the job. Then remove the whole system

[rwb]

hrw relay

The what?

how'd you know it's doing as regen

Normally the first thing I notice is that the MPG has plummeted. It's also down on power (torque is limited) and the engine tone changes.

The system activates the heated rear window in order to put load on the engine via the alternator. The heated mirrors come on with the heated rear window, so I open the window and feel the mirror to confirm that it's doing a regen.

The system on the DW12B seems to be quite different to the 406. For a start the DW12B has no intercooler bypass (which Doggy removed using Nico pipes). By monitoring the additive levels, I know I have enough for 250 visits to the petrol station, so it won't run out any time in the next 8 years!

[Doggy]

hrw relay

The what?

heated rear window

Since the 406 was PSA's first attempt at dpf's it wouldn't be surprising if they made a better job of it on later cars. I suspect more modern ones are far less of a problem, but still don't take kindly to urban driving / short runs, (which I guess isn't an issue for you and Alex).

Reading your posts just reminded me of the early days when my 406 still had a dpf. You get to know what it's up to.

On 406's at least it doesn't just inject additive into the tank when you add fuel, it does it every time you start the engine and at other times too. Regens are triggered not only by detecting increased differential pressure, but also by distance since last regen. This value decreases to match the ecu's 'model' of dpf condition, broadly it assumes every succcessive regen will be fractionally less effective than the previous one. The additive does not get burned away with the soot and ultimately it's this that blocks the filter.

Having said all that, it's likely a car like yours can probably get through it's entire life with maybe only one dpf clean or replacement. I suspect a lot of 2.2 406's would have found their way into scrapyards by now if we didn't have an alternative method.

[rwb]

On these the ECU calculates the filter load based on driving style (motorway, heavy traffic...) and the pressure sensors are only there as a backup!
Still haven't got the LED soldered in -- forgot to do it and haven't been anywhere with a soldering iron recently

Anynway, on to EGR blanking.
I had the EGR blanked on my 406 and was very happy with it, so this was always on the agenda with the 407.

All you have to do on the 406 is disable (bung or clamp) the vacuum supply that controls the EGR valve. On the 407 2.2 HDi the EGR is electrically controlled, so the only option is blanking.

There is now a blanking plate available on eBay (seller bertye1958) for £3.95 delivered -- just about within my budget

The EGR pipe is the pale coloured one to the right of the engine.

There are two 10mm nuts holding it to the inlet manifold, and the 10mm nut clamping it to the top of the engine needs to be undone to let the pipe move.
To get to the bottom nut you have to remove the air scoop -- which is held in place by nothing more the pipe attached to it!
You need a short extension to get to the bottom nut.

Here it is off. Yuck! This was a real nasty surprise; I really didn't think it would be that bad. This is after 7 years and 80k. It's mostly blanked already!


Here it is back together...

...sort of.
That looks like a gap to me. It looks a lot bigger in the picture.

After 10 miles there's no evidence of a leak, so I'll let it develop for a week and if soot starts to appear then I'll know that it needs looking at.

I suspect that crap in the pipe is trapped between the orange bracket and the blank plate, and that I should have spent longer cleaning it out.

The results are exactly as they were on the 406 -- astonishing:
* when going from overrun to asking for power the response is much more urgent,
* easier matching revs for gear changes,
* easier to keep MPG up when trying to nurse it up hill on a light as possible throttle.

[OllieNZ]

You've blanked the inlet manifold end?
Does this cause any computer issues?
I'm considering doing this with my 307 while I'm in there doing my glow plugs.

[Doggy]

Well done Rich.

The other advantage of a blanking plate vs disabling the egr valve is that it positively shuts off the recirculation flow. I'm 99% certain my egr valve was letting by a little all the time. I have noticed a similar driving improvement.

Let us know if you get a sustained mpg improvement too.

[rwb]

No issues, and not expecting any.
It's when there's a problem with the electrical components -- vacuum electrovalve on the 406 or the EGR itself on the 407 -- that the EML comes on.

I am, however, expecting to see intermittent faults about it not being able to recycle enough gas.
Just reading up on all the various valves right now...

[Captain Jack]

Ooh, nice! One on the list for me!

Did you clean out any of the skank?

[Doggy]

I am, however, expecting to see intermittent faults about it not being able to recycle enough gas.
Just reading up on all the various valves right now...

Don't if it's relevant, but so far I have had no issues whatever despite still having an egr-enabled map. It's done about 1500 miles since blanking the egr, so I think it would have shown up by now.

[Doggy]

Me and my big mouth

Checked with PP2k this evening and yes, I have the fault code:

Permanent fault EGR circuit:
Air flow higher than expected.

It didn't cause an EML, or any untoward behaviour I could detect.

Seeing the error of my ways, I have now installed a no-egr map, (which by pure coincidence may have added 200 mbar to maximum boost).

[Captain Jack]

Wonder how easy it is to de-EGR the 407 2.2HDI... certainly they can't be flashed with the 1260.

[rwb]

The impression I get from Adriano & co over at ecuedit is that it's no more difficult to edit the map than any other ECU (although I don't know how common this particular ECU is -- it's a Bosch EDC16 CP39). The problem for end users, however, is indeed getting it flashed; I believe it has to be bench flashed

[OllieNZ]

You can have an edc 16 flashed in car the guy who did my 307 did it via the obd port, apparently it's down to the equipment and software used

[Captain Jack]

Pretty sure it doesn't have to be bench flashed but you do need a new interface for the ODB port. Adriano should know...