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      04-14-2013, 04:54 AM   #1
Jedimindtrix
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Possible Thermostat problem.

Sorry if this subject has been done to death.

I don't drive my wife's D3 (e90 chassis) that much to be honest but recently when going on long runs I've noticed that the MPG has slipped down to around 40, when I first bought the car the mpg on long runs was around 48.

I've also noticed that the climate control takes around 2 miles to kick in.

Could the above point to the stats needing replacement?

The car is up to date on servicing, oil changes etc etc

Cheers lads.
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      04-14-2013, 06:06 AM   #2
mistryn
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Possibly, but first thing to check is the coolant temp through the hidden menu. anything below 75 Degrees over a constant run would indicated EGR and main stat needing to be replaced.

EGR stat is a 15 min job to replace, main stat is a little bit more involved but certainly DIY'able

what year/milege is your car?
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      04-14-2013, 06:09 AM   #3
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2007, and on 60,000 miles,

Cheers
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      04-14-2013, 06:19 AM   #4
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Almost certainly the thermostats will be past their best.
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      04-14-2013, 06:19 AM   #5
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have a lok at hidden coolant temp menu after short drive temp should be arounf 88-92 degrees. if you are getting low temps then most reason why your mpg has dropped over time as the engine/ecu has incorrect info thinking the car still needs to warm up so uses more fuel etc
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      04-14-2013, 06:25 AM   #6
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Cheers lads, I've got a 160 mile round trip today so will check then.

Any idea on costs to replace at a garage? as I also need my fuel filter replacing.
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      04-14-2013, 06:39 AM   #7
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I would say 2/3 hours labour time, both stats come in around 75 from main dealer here plus couple litres of coolant

Tip - if a garage charges you extra to replace the egr stat if you are getting both done, question them as the egr stat has to come off to access the main stat
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      04-15-2013, 03:58 AM   #8
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Also, you dpf will be getting more and more clogged and that will cost bigtime, just get them done every 60k miles.
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      04-15-2013, 04:13 AM   #9
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As we are on the subject of DPF's can anyone explain how to tell when the dpf is regenerating I.e what are the signs?
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      04-15-2013, 04:49 AM   #10
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My 335d held onto the gears. Instead of changing around 2.2k rpm it would go higher under normal acceleration. It would also hover around 2k for quite some time when just cruising at a steady speed before changing up. (When it would normally change up straight away and sit at about 1.5k rpm)

The exhaust note can change and some people report slight hesitation but I didn't notice either of these.

You can smell it outside the car too, a funny smell, like burning sugar.

Whilst driving I only ever noticed the revs and the mpg needle swing drastically to the right and sit between 20 and 30mpg instead of 40 to 50. That plus the coolant temp increase by about 5c from its normal stable average.
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      04-15-2013, 05:01 AM   #11
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^^

Didn't realise that smell was the DPF, I 've had that a few times and I thought it was the tyres.
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      04-15-2013, 07:15 AM   #12
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If you stop shortly after it's finished your exhaust will be ticking away as it's got so hot.

I notice a bit of hesitation in the lower gears if you're on a steady throttle.
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      04-15-2013, 08:15 AM   #13
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Quote:
Originally Posted by briers View Post
My 335d held onto the gears. Instead of changing around 2.2k rpm it would go higher under normal acceleration. It would also hover around 2k for quite some time when just cruising at a steady speed before changing up. (When it would normally change up straight away and sit at about 1.5k rpm)

The exhaust note can change and some people report slight hesitation but I didn't notice either of these.

You can smell it outside the car too, a funny smell, like burning sugar.

Whilst driving I only ever noticed the revs and the mpg needle swing drastically to the right and sit between 20 and 30mpg instead of 40 to 50. That plus the coolant temp increase by about 5c from its normal stable average.
Thanks for the help, I'll make a note of this.
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