19 & 20 are the particle filter pressure pipes, 2 is the gas temp. sensor | 1 is the Diff Pressure Sensor, 6 the particle filter pressure pipes |
407 very intermittent surging
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Re: 407 very intermittent surging
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Re: 407 very intermittent surging
My downstream temp sensor always shows 100 degrees or thereabouts even when stone cold. It must be the minimum reading of the sensor.
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Re: 407 very intermittent surging
Yes, the exhaut temp count only starts at 100c, Pete. Mine shows <100c (less than) until it exceeds it.
If you have seen the pressure fluctuating, at least it's showing it's working of sorts so I'd not be concerned any more with it at this point.
If you have seen the pressure fluctuating, at least it's showing it's working of sorts so I'd not be concerned any more with it at this point.
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Re: 407 very intermittent surging
So the downstream temp is fine. Thanks for the confirmation. I saw a reading on the diff pressure twice from 6/7 revs, the first 2. Thanks for the pics Marc, Is the noted '2' on the first diagram the '2' on the second 'cause 2 on the first looks like a gasket and I can't see '1' on the second, unless it's '2'? I've got onto Service Box now but have to do it through a VPN in the UK or it asks for my Siret No. (business No.), not sure if it's checked? But hey it it works 'if I'm in the UK!' I'll have a look, but can't teleport whilst writing! I think I need to get under the car, to have a look if nothing else. Just need to figure out why it's in a constant state of regen, though if it does a regen on a non motorway run that will, at least, have sorted the initial issue.
We will see
Oh and Mike, when I read it through this morning I realised you were just pulling my p......r, just too tired last night to realise.
We will see
Oh and Mike, when I read it through this morning I realised you were just pulling my p......r, just too tired last night to realise.
Pete
Notice the BX is still top the list but sadly gone
Notice the BX is still top the list but sadly gone
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Re: 407 very intermittent surging
No Pete the component numbers are not the same. These are 2 different diagrams. On the left hand diagram 19 & 20 are the pressure pipes, but 2 on the right hand diagram is the Exhaust gas temperature sensor. If you look closely along side the particle filter on the right diagram you can see the pressure pipe running alongside.
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Re: 407 very intermittent surging
Cheers Marc
Pete
Notice the BX is still top the list but sadly gone
Notice the BX is still top the list but sadly gone
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AND a 1980 Z1000ST
AND a 1983 GPz1100 inj
AND a 1995 Zephyr 1100
AND a 1980 Z650 (my moped) - x 314
Re: 407 very intermittent surging
Beer o'clock. Just been on a drive at 50 mph (speed limit here) with the 'puter plugged in. It got to 77% soot then regenned back to 1% with absolutely no hiccups. Revs were at 1700 ish as well. Did notice that the diff pressure is almost always at 0, very occasionally increasing to 25 ish if I accelerate then once the speed levels out it goes back to 0 and the state of regen is still 'regeneration'? Need to get under the car to check the pressure pipes next.
Pete
Notice the BX is still top the list but sadly gone
Notice the BX is still top the list but sadly gone
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Re: 407 very intermittent surging
I still suspect there might be something up with your differential pressure sensor.
If the sensor is accurate is it possible that someone has 'holed' the DPF as there will always be some sort of back pressur surely?
If the sensor is accurate is it possible that someone has 'holed' the DPF as there will always be some sort of back pressur surely?
- moizeau
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407 HDI 136 auto
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2010 Dispatch III HDI 90
AND a 1980 Z1000ST
AND a 1983 GPz1100 inj
AND a 1995 Zephyr 1100
AND a 1980 Z650 (my moped) - x 314
Re: 407 very intermittent surging
I agree, do you know where the sensor is and if it's checkable? I've checked underneath and there isn't any obvious damage. It's been through the French MOT on the new regs so I don't think the DPF has been played with, also the previous owner had it for the last 100000m and isn't the sort. It does seem odd that 'apparently' it's in a permanent state of regen, however it doesn't keep the soot down to zero ish which is what I would expect if that was really the case, fuel consumption is good also. I'd guess that a high diff pressure would force a regen? What else would ask for a regen?
This a copy of the CT with the emission values, it would be interesting to compare the figures.
This a copy of the CT with the emission values, it would be interesting to compare the figures.
Pete
Notice the BX is still top the list but sadly gone
Notice the BX is still top the list but sadly gone
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Re: 407 very intermittent surging
To be fair, a bashed through DPF would probably give a better running engine and higher economy. It may have been remapped to prevent any error codes (from low diff pressure) from turning up.
Could you get an assistant to floor the throttle whilst you look at the exhaust? There should be no hint of black smoke with a fully functioning DPF.
I can't really see that picture as it's a bit pixelated.
Could you get an assistant to floor the throttle whilst you look at the exhaust? There should be no hint of black smoke with a fully functioning DPF.
I can't really see that picture as it's a bit pixelated.
- moizeau
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407 HDI 136 auto
C4 2l petrol coupé
2010 Dispatch III HDI 90
AND a 1980 Z1000ST
AND a 1983 GPz1100 inj
AND a 1995 Zephyr 1100
AND a 1980 Z650 (my moped) - x 314
Re: 407 very intermittent surging
Elis, click on the image then you get a plus sign, or at least I do, just checked it my Diag laptop as well. No smoke what so ever, I watched during a rev test on the CT, I will do it again though, to do it with an auto, better in park or neutral?
Pete
Notice the BX is still top the list but sadly gone
Notice the BX is still top the list but sadly gone
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Re: 407 very intermittent surging
Ok, I can see it now, however I should probably brush up on my french!
If there's no smoke then I assume all is well, just my suspicious mind
On my C5 the Diff pressure sensor is located on the bulkhead in the engine bay with the tubes running down to the exhaust tunnel.
If there's no smoke then I assume all is well, just my suspicious mind
On my C5 the Diff pressure sensor is located on the bulkhead in the engine bay with the tubes running down to the exhaust tunnel.
- moizeau
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407 HDI 136 auto
C4 2l petrol coupé
2010 Dispatch III HDI 90
AND a 1980 Z1000ST
AND a 1983 GPz1100 inj
AND a 1995 Zephyr 1100
AND a 1980 Z650 (my moped) - x 314
Re: 407 very intermittent surging
Cheers Elis, I'll have a poke tomorrow.
Pete
Notice the BX is still top the list but sadly gone
Notice the BX is still top the list but sadly gone
- moizeau
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407 HDI 136 auto
C4 2l petrol coupé
2010 Dispatch III HDI 90
AND a 1980 Z1000ST
AND a 1983 GPz1100 inj
AND a 1995 Zephyr 1100
AND a 1980 Z650 (my moped) - x 314
Re: 407 very intermittent surging
Found it, centre top of the bulkhead. It's got the factory fitted pipe clips so I'm not going to touch it until I've got some replacements, the spring loaded clips that hold the fuel lines on mowers look the job. I'm presuming once I've unclipped them I should be able to blow down them easily. That should see they're blocked at the exhaust end, and then if I unscrew the metal pipes from the exhaust and block them up, blow again and I shouldn't be able to. Not going to do anything until I've taken my daughter to Wales though, every things working and I don't want to compromise anything. I say every things working, the ABS ecu is not talking to the 'puter, no warning lights, but I've found a broken wire in the front rh w/arch, guessing it will be that then. Something else to stop be getting bored!
Is there any way of testing the sensor or is it just a swap job?
Thanks
Is there any way of testing the sensor or is it just a swap job?
Thanks
Pete
Notice the BX is still top the list but sadly gone
Notice the BX is still top the list but sadly gone
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Re: 407 very intermittent surging
Clic clips? They're actually very good and worth re-using as they're sized to the pipe diameter. A small bladed screwdriver can unclip them and a pair of pliers will refit them but it's better to use dedicated clic clip pliers as they're not expensive and make the job very quick!
I have these as they've got articulated heads allowing wider angles of access than fixed pliers.
https://i.ebayimg.com/images/g/icsAAOxy ... -l1600.gif
One easy way to test the sensor is to simply blow into the upstream port or pipe (depending which you detach) and observe the live data (key-on, engine-off).
I have these as they've got articulated heads allowing wider angles of access than fixed pliers.
https://i.ebayimg.com/images/g/icsAAOxy ... -l1600.gif
One easy way to test the sensor is to simply blow into the upstream port or pipe (depending which you detach) and observe the live data (key-on, engine-off).