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      03-17-2012, 02:56 AM   #1
Laney
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2006 BMW 330d  [4.00]
2006 330d power and economy issues

Would a faulty thermostat affect the performance as well as economy?

My engine temp doesn't get much above 75c. On the last tank I drove as economically as I could and got 466 miles from 57 litres (37mpg).

I've also had performance issues recently but they seem a little intermittent.

I'm after any ideas on this as its bugging me.

No fault codes are logged.

Thanks in advance

Andrew
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      03-17-2012, 03:38 AM   #2
parapaul
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That temp is defniitely low - and yes, a faulty 'stat will affect economy.

Sadly, there's nothing wrong with either of my stats and despite doing virtually nothing except 40 mile motorway runs with cruise control set at 70, I can't get mine to return any more than 35mpg. While I'm sat on the motorway the swingometer will show 45-50mpg, but the second I hit town, traffic lights and traffic, the economy just plummets.
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      03-17-2012, 03:57 AM   #3
Danny.B.
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Ive just done another good tank, usually see around 45mpg but with a 300mile trip to birmingham and back im showing 54.3mpg now.
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      03-17-2012, 04:30 AM   #4
Mr Singh
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I do 100% town driving and avg around 32-33 if i'm lucky. I managed to get close to 35mpg with a mix of motorway and town. I don't think the remap improved the economy or worsend it. DPF delete is on the cards should see a 5mpg improvement.

Danny, yours is a manual right? If so I'd expect it to be better but by 10mpg+ thats a pretty big difference!

How do you find the hidden ODO temp gauge? Might be worth checking my 'stat temps too!
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      03-17-2012, 04:33 AM   #5
foxy-stoat
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Change the egr stat, they are around 30 and takes about 30 minutes to fit.

I did that and the main state and now see around 44mpg. I wouldnt pay too much attention to the car mpg gauge so i work mine economy out brim to brim.
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      03-17-2012, 04:58 AM   #6
Danny.B.
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Quote:
Originally Posted by Mr Singh View Post
I do 100% town driving and avg around 32-33 if i'm lucky. I managed to get close to 35mpg with a mix of motorway and town. I don't think the remap improved the economy or worsend it. DPF delete is on the cards should see a 5mpg improvement.

Danny, yours is a manual right? If so I'd expect it to be better but by 10mpg+ thats a pretty big difference!

How do you find the hidden ODO temp gauge? Might be worth checking my 'stat temps too!

It is indeed a manual

Check here for the Hidden menus!

http://e90.wetpaint.com/page/BC+hidd...us/revision/37
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      03-17-2012, 06:00 AM   #7
Mart1000
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I'm also getting about 3mpg town and bang on 45mpg at 80 (cruise) sailing up motorway. For a 3L oil burner I think that's pretty good compared to the a8/e class I used to have
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      03-17-2012, 07:17 AM   #8
makkan00
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Quote:
Originally Posted by Mart1000
I'm also getting about 3mpg town and bang on 45mpg at 80 (cruise) sailing up motorway. For a 3L oil burner I think that's pretty good compared to the a8/e class I used to have
3 mpg in town.
Mart it sounds typo error.
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      03-17-2012, 07:30 AM   #9
Mr Singh
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Quote:
Originally Posted by Danny.B. View Post
It is indeed a manual

Check here for the Hidden menus!

http://e90.wetpaint.com/page/BC+hidd...us/revision/37
Blimey, you would have thought BMW would make it little easier lol.

So theres a main thermostat and an EGR one too.. I'm guessing that checking the engine temps won't really tell you which item is duff?
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      03-17-2012, 07:31 AM   #10
Mart1000
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Hehe yeah a typo indeed.
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      03-17-2012, 11:22 AM   #11
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Quote:
Originally Posted by Mr Singh View Post
Blimey, you would have thought BMW would make it little easier lol.

So theres a main thermostat and an EGR one too.. I'm guessing that checking the engine temps won't really tell you which item is duff?
We are not supposed to be needing the ECT, or the other hidden data.

No, the temperature won't tell which is at fault, but will gives some pretty good clues. Very low ECT averages are typically the EGR thermostat, can be open from room temperature, so usually a long warm up time/mileage as well.

But often, even after the EGR 'stat change, the temperature is still lower than it ought to be. the main 'stats seem to lose their optimum range and run low, slowly degrading over time, rather than a complete failure.

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      03-17-2012, 11:51 AM   #12
Mr Singh
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Thanks for the explanation

I will check the temps later today. I'm kind of hoping its old tired and need of changing, in turn giving me some mpgs i'm clearly missing.
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      03-18-2012, 03:21 AM   #13
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I found the best way to increase mpg is to use shell diesel extra I've gained nearly 5mpg
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      03-18-2012, 09:47 AM   #14
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Quote:
Originally Posted by Mr Singh View Post
Thanks for the explanation

I will check the temps later today. I'm kind of hoping its old tired and need of changing, in turn giving me some mpgs i'm clearly missing.
Mr Singh, your car may only need those replacing if your car is on >80K miles.
Check through hidden menu, and if needed, follow as advised above.
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      03-18-2012, 12:30 PM   #15
Mr Singh
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Yeh car has done 63k (4k in my ownership)

I'm going to check the menu shortly since the missus has been using the car all weekend!
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      03-18-2012, 03:47 PM   #16
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I notice you ask does it affect performance. I've got a similar temperature problem and have run some performance figures with my Racelogic V-box (GPS device).

I've only had my 335d a week (it's done 80,000m) and noticed the temperature runs in the high 70s, regardless of type of driving, taking a very long time to get there.

Some of the figures I got were:
0-60 = 6.1s
0-100 = 14.5s

which is down on figures I've read for a standard car, from magazine articles and the likes of Carlos.

Fuel consumption over last week, which was all short journeys around town has been 26mpg. I hope to change the EGR stat next week and see if it makes any difference.

Regarding te DPF delete, there was talk of it being a requirement of the MOT from 2012 to have one in place if the car was build with one, anyone got any further info on this? I do like the idea of deleting it, it must restrict the engine but I don't want to be blowing out a cloud of black smoke.

Last edited by Mustard3; 03-18-2012 at 03:52 PM.
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      03-19-2012, 05:37 PM   #17
m1bjr
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Ambient temperatures affect efficiencies of diesel engines markedly.

My economy is down some 15%+ in very cold weeks doing mainly motorway trips.
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      11-19-2012, 03:02 AM   #18
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Hey Mustard 3,

I know it's been some time but did you replace the EGRs and did it improve your mpg?
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      11-19-2012, 04:11 AM   #19
Mustard3
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Quote:
Originally Posted by invisible View Post
Hey Mustard 3,

I know it's been some time but did you replace the EGRs and did it improve your mpg?
I did replace the EGR stat, and found the old one to be sticking open. It made a little difference to the temperature but replacing the main stat is what put things right. Straight away it would (once up to temperature) sit at 89 on the motorway and over 90 around town.
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      11-19-2012, 08:57 AM   #20
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Quote:
Originally Posted by foxy-stoat View Post
Change the egr stat, they are around 30 and takes about 30 minutes to fit.

I did that and the main state and now see around 44mpg. I wouldnt pay too much attention to the car mpg gauge so i work mine economy out brim to brim.
I did the same, better to replace both!
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      01-16-2013, 03:53 AM   #21
blutak
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Hi, got a 330d, e92 and with an outside temperature of -2 degrees it took 3 miles of urban driving and 25 mins of motorway driving (70mph ish) to get to 82 degrees? Is this normal or should I take it to the dealers for replacement thermostats.
Thanks
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      01-16-2013, 05:56 AM   #22
Dan-danGT
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I have a 08 330d auto, i have had it two weeks just over, and i think its bad of fuel. but its getting better, i think its my driving style as i have never owned an auto. I measured it tank to tank it managed 31mpg and on the i drive did 30mpg, probably 50/50 town and dual carriageway driving.

I have got low coolant temp also, 79c is about all it manages no matter how fast or slow i drive, so its booked in for AUC to sort my low coolant temp. Also noticed mine after a 20-30 mile drive pulling up to a stop it misfires slightly and the rev counter bounces about abit. Hopefully everything is linked and bmw find a fault which helps my mpg
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