[clart]

Just been searching through a few threads on engine temp so i used to hidden menus this morning to check mine.

On a 26 mile motorway it only once got upto 74 degrees when i was gunning it. Sat around 66 with the cruise on at 70mph.

So i guess i'll change the EGR thermostat first. Does anyone have a part number for a 335d pre LCI? Is it a fairly easy job?

Thanks

[clart]

http://www.allgermanparts.co.uk/prod...9&group=100094

is this the same part BMW would supply?

[Murphyslaw]

99% of the time it's the main thermostat so would recommend both. Best to get from bmw, oems fail quickly.

[Craig242]

How do you get the temp to display while driving? Mine doesn't seem to want to appear unless in stage 1 of ignition sequence

[clart]

it just stayed on the dash until i turned the ignition off.

[dy63]

just get both changed at same time.

[shaun335d]

Getting both mine changed on Friday and getting dpf clean. Local Indy £267 +

[marklemac]

Originally Posted by clart

http://www.allgermanparts.co.uk/prod...9&group=100094

is this the same part BMW would supply?

I bought my main and egr stat from Jason (All German Parts), he's a top man and great service.

[Rich_D]

If it never gets fully up to temp it's the main thermostat (usually the problem), if it gets up to temp, but fluctuates with speed it's the EGR thermostat.

Change both IMO, only get genuine BMW ones too, or OEM (Behr manufacture them from BMW) from alternative sources, Eurocarparts sell the Behr EGR stat, but not the main one for example.

EGR stat is very easy to replace, main stat is not as easy to do, there are DIY guides online with photos.

[Cro]

egr stat 11717787870
main stat 11517805811

[jackstrath]

Mine is only getting 66oc at 70' (ambient is 4oC just now)

Do I have a issue ?

[Rich_D]

Yes, that's way too cold, it will be harming your mpg and your DPF

[dy63]

i think the DPF thing is rather nonsense tbh. my previous 330d was only ever getting 70's highest wherever it went before i changed the thermo's and still MY DPF was regularly regenning. i could tell and also checked using software ive got so people do say if your temps are below 80 something it wont regen where as both of mine did regen

[clart]

so why did you change them?

My BMW specialist who worked for Sytner for over 10 years says that the DPF regens over 76 degrees, only when it needs to.

[HighlandPete]

Originally Posted by cupraraj

i think the DPF thing is rather nonsense tbh. my previous 330d was only ever getting 70's highest wherever it went before i changed the thermo's and still MY DPF was regularly regenning. i could tell and also checked using software ive got so people do say if your temps are below 80 something it wont regen where as both of mine did regen

Not quite sure why you'd say it is nonsense. BMW state the relevant coolant parameter for instigating a regeneration is ECT >75C. Many engines don't get to a 'nominal' 75C so regenerations are hampered in some cases.

We must remember all components/sensors have tolerances, so we will have a +/- variation for a DPF regeneration trigger, in reality.

HighlandPete

[dy63]

Originally Posted by clart

so why did you change them?

My BMW specialist who worked for Sytner for over 10 years says that the DPF regens over 76 degrees, only when it needs to.

Because mpg was low

[clart]

Why does the dpf need to regenerate? Is it due to doing short journeys?

[dy63]

Originally Posted by clart

Why does the dpf need to regenerate? Is it due to doing short journeys?

yh gets clogged

[HighlandPete]

Originally Posted by clart

Why does the dpf need to regenerate? Is it due to doing short journeys?

The DPF is continually collecting and storing particulate matter (PM/soot) it is a trap after all, and needs with heat and the catalyst reaction, chemically change the state of the PM with a 'burn off', to limit emissions.

If we have ideal conditions the DPF can burn off in a passive mode, but not many users get (or drive in) the conditions to do so. Therefore at certain intervals, the DPF will go through a “regeneration phase” to burn off the residual soot.

It is the issue with the parameters required to initiate the burn off, where engine coolant temperature comes into play. Low or slow warm up just compounds an already challenging situation for a lot of low mileage users.

HighlandPete

[Rich_D]

Originally Posted by cupraraj

i think the DPF thing is rather nonsense tbh. my previous 330d was only ever getting 70's highest wherever it went before i changed the thermo's and still MY DPF was regularly regenning. i could tell and also checked using software ive got so people do say if your temps are below 80 something it wont regen where as both of mine did regen

It's definitely not nonsense, this happened on a friends E60 and it killed his DPF, in the end he just gutted it and got the car remapped, but the low running temp from the thermostats is what killed it.

[dy63]

Originally Posted by Rich_D

It's definitely not nonsense, this happened on a friends E60 and it killed his DPF, in the end he just gutted it and got the car remapped, but the low running temp from the thermostats is what killed it.

There is other reasons why it wont regen. Some say if your temp is under 80 something it WONT regen and my point was its not entirely true as mine still did regen at 70 odd degrees

[Rich_D]

The OP is seeing 66c motorway cruising, as is the 2nd chap that I replied too, at such low temps the DPF will not regen and will not be doing your mpg any favours, if yours still regens at 70 odd degrees then that's great news, but for the 2 guys running mid 60's it won't be the case!