[satish_141]

Hi,


My car is an E90 320D which is in good condition. Had proper services at regular intervals, new tyres when needed etc. in the City my car used to do 41 MPG ( it is a 2006 E90) and on the motor way it used to do more than 48MPG. Now in the city my car is only doing 30MPG and sometimes my OBC shows this as 29MPG, pretty appalling! Not sure what is going on? my car is done 100,000 miles already, but I still expect this to give good consumption.

Could someone please help, what I need to check where things are gone wrong? and what I need to get fixed? etc...any help is greatly appreciated. Thanks.

Satish

[IanS100]

First thing to check is that the thermostats are working correctly & that the engine is getting up to the correct temperature

[Digitalize]

As said, thermostats would be my first port of call. Check it using the hidden menu in the OBC, a google will find you the instructions on how to use it.

[satish_141]

hello, thank you both for the informations..I will google and check how the thermostats are in my car...

[satish_141]

Originally Posted by Digitalize

As said, thermostats would be my first port of call. Check it using the hidden menu in the OBC, a google will find you the instructions on how to use it.

is this the below I need to check in OBC?

07.00 KTMP-MOM
(Kühlmittel Temperatur im Moment) Current Coolant temperature

[Digitalize]

Yes, should sit 88c when warm. Will obviously take a while to get warm. Should be there even with AC on, shouldn't dip when on motorways/coasting etc.

[satish_141]

Originally Posted by Digitalize

Yes, should sit 88c when warm. Will obviously take a while to get warm. Should be there even with AC on, shouldn't dip when on motorways/coasting etc.

Thank you will check and update.

[Digitalize]

88 is the minimum, if it's around 80, it's your EGR thermostat, if it's struggling to hit 70, it's probably both.

[satish_141]

Originally Posted by Digitalize

88 is the minimum, if it's around 80, it's your EGR thermostat, if it's struggling to hit 70, it's probably both.

sorry one is EGR thermostat, what is the other one? thx

[Jase 320d]

Originally Posted by Digitalize

88 is the minimum, if it's around 80, it's your EGR thermostat, if it's struggling to hit 70, it's probably both.

My m47 320d sat at 80 degree's

Changed egr thermostat and it still sits at 80

[Dan-danGT]

My 330d use to sit at 80 I changed egr stat which made no difference or minimal. Changed main stat which brought the temp to 90c

How ever if I lift off the throttle and coast it stilll drops 3-4c which I think is my auto gearbox stat. But its been fine since so I left it.

[satish_141]

Hi checked the temp its only showing 64C after half hour continuous driving...

[kowalski]

Originally Posted by Dan-danGT

My 330d use to sit at 80 I changed egr stat which made no difference or minimal. Changed main stat which brought the temp to 90c

How ever if I lift off the throttle and coast it stilll drops 3-4c which I think is my auto gearbox stat. But its been fine since so I left it.

what auto gearbox stat? Had both egr and main stat changed last year and the temperature drops to 84-86 when going downhill (normal is 89-92).

[satish_141]

Originally Posted by Digitalize

88 is the minimum, if it's around 80, it's your EGR thermostat, if it's struggling to hit 70, it's probably both.

please find my pic with temp

[satish_141]

any ideas how much it may cost to replace both EGR and also main thermostats?

[Jase 320d]

Egr stat is a simple diy!

It literally takes 5mins!


I also need the main stat done but looks a little trickier so will get it done at my next service

My temp sits at 80 so im only about 5mpg down (can wait for the time being)

[satish_141]

Originally Posted by Jase 320d

Egr stat is a simple diy!

It literally takes 5mins!


I also need the main stat done but looks a little trickier so will get it done at my next service

My temp sits at 80 so im only about 5mpg down (can wait for the time being)

Thanks Jase..how much it costs if I were to get both done at a BMW specialist garage? I want to get this ASAP as I am only getting 29 MPG..I will be happy even if I get 35+

[Jase 320d]

Both parts are around £70-£80 from bmw for both

I think the main stat is 2 hours labour. Hopefully they'll just charge 2 hours labour for both including coolant change


I think you'll be around the £200 mark

[satish_141]

Originally Posted by Jase 320d

Both parts are around £70-£80 from bmw for both

I think the main stat is 2 hours labour. Hopefully they'll just charge 2 hours labour for both including coolant change


I think you'll be around the £200 mark

Thank you

[Digitalize]

Mine was struggling to hit 70, garage agreed to change the main thermostat, got it to 80 consistent, EGR got it to 88, coasting a mile downhill to my town drops it a little especially now but sits 88 lovely.

Will be both. About £200 I'd imagine for a specialist. They shouldn't really charge for the other it's so easy. Although my boost pipe was perished so had to get a new one of those too. Took it off for easier access.

[satish_141]

I checked with Munich MOTORS and the quote was £350 for egr and main stat and coolent change..looks like its a lot more than expected..I don't want to go there..any other good bmw specialists near reading anyone could suggest please?

[joncoyle87]

A job like this wouldn't have to be a BMW specialist.
It's a pretty common fault for all cars so any decent garage should sort it for half the price they have quoted you