DPF not regenerating.

Darkswarmer · 02-12-2021, 07:30 PM

Quote:

Originally Posted by Darkswarmer

Quote:

Originally Posted by jab64000

My car was showing the high DPf alarm. The garage checked it and found 2 faulty glow plugs and a faulty glow plug module. Those were changed out and it still wouldn't regenerate even after resetting and giving the car a "Terraclean" and taking it for long motorway runs. I don't think it was getting hot enough when the alarm was clear. I Checked the standing alarms and the 408a was still there. I ended up going for a run with the mechanic today and he kept on resetting the 408a while I drove. I could see that the car was trying to regenerate as the fuel gauge was dropping all the time. After a few minutes it carried out a regenerate and what a difference. The temperature dropped from over 590 down to a much better 290 deg c. I gave it another 30 miles and the car was driving well with no alarms coming in. I think the glow plugs were the original fault, but the dpf had clogged up so it was a bit of a vicious circle. The log said it hadn't regenerated for 1700miles , but now saying it completed one 30miles ago. Anyway - here is hoping

If you haven't already, monitor your engine temperature or coolant temperature while you are driving. If you are not reaching at least 85°C then the car will have a hard time regenerating and may not even attempt it if you are below 80°C. If that is the case, you need to replace the thermostat. I had the exact same warning as you and I replaced the thermostat and cleared the codes a couple times on the freeway and I have not had the codes come back. It's been two years since then. Happy to walk you through that replacement if you need it

The reason your glow plugs are probably burning out is because they are probably being activated to try to heat up the combustion temperature in order to do a regeneration, because the engine itself is not reaching the temperature it needs in order to regenerate without Making your glow plugs work overtime

jab64000 · 02-13-2021, 12:43 AM

Correct me if I am wrong, but I thought the glow plugs only came on when the engine was cold and then went off? I don’t think they would come on after that? When I am talking about the engine I was talking about the DPf temperature which you can interrogate under live data? According to the garage glow plug failure is the commonest fault with bmw not regenerating. By the way has anyone ever had their 335 terra cleaned, and if so what was the result?

335dlci · 02-14-2021, 01:48 AM

Quote:

Originally Posted by jab64000

Correct me if I am wrong, but I thought the glow plugs only came on when the engine was cold and then went off? I don’t think they would come on after that? When I am talking about the engine I was talking about the DPf temperature which you can interrogate under live data? According to the garage glow plug failure is the commonest fault with bmw not regenerating. By the way has anyone ever had their 335 terra cleaned, and if so what was the result?

GP are used at operating temp also. What's a terra?

the-rain-king · 02-15-2021, 01:16 AM

Quote:

Originally Posted by 335dlci

GP are used at operating temp also. What's a terra?

TerraClean

Yozh · 02-15-2021, 11:08 PM

Glow plugs are cycling up to coolant temp of 75degC. This is used for emissions and noise control. If your thermostat has failed and your motor does not reach 75C you will kill the glow plug control module quite fast. Faults within the glow plug control system will not stop DPF regenerations but not reaching 75C will. Good luck.

335dlci · 02-16-2021, 12:12 AM

Quote:

Originally Posted by Yozh

Glow plugs are cycling up to coolant temp of 75degC. This is used for emissions and noise control. If your thermostat has failed and your motor does not reach 75C you will kill the glow plug control module quite fast. Faults within the glow plug control system will not stop DPF regenerations but not reaching 75C will. Good luck.

75c? Not according to bmw literature

Yozh · 02-17-2021, 09:42 PM

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Originally Posted by 335dlci

75c? Not according to bmw literature

In reference to what?

335dlci · 02-17-2021, 10:48 PM

Quote:

Originally Posted by Yozh

In reference to what?

Glow plugs are used even at operating temps.

02-13-2021, 12:43 AM	#24
jab64000 New Member 3 Rep 8 Posts Drives: 2007 335D Join Date: Dec 2018 Location: Scotland iTrader: (0)	Correct me if I am wrong, but I thought the glow plugs only came on when the engine was cold and then went off? I don’t think they would come on after that? When I am talking about the engine I was talking about the DPf temperature which you can interrogate under live data? According to the garage glow plug failure is the commonest fault with bmw not regenerating. By the way has anyone ever had their 335 terra cleaned, and if so what was the result? Last edited by jab64000; 02-13-2021 at 12:44 AM.. Reason: Additional info
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02-15-2021, 11:08 PM	#27
Yozh Colonel 870 Rep 2,615 Posts Drives: 2011 335d M-Sport Join Date: Mar 2014 Location: Wet Coast iTrader: (4)	Glow plugs are cycling up to coolant temp of 75degC. This is used for emissions and noise control. If your thermostat has failed and your motor does not reach 75C you will kill the glow plug control module quite fast. Faults within the glow plug control system will not stop DPF regenerations but not reaching 75C will. Good luck.
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