Originally Posted by Bob525D' post='826403' date='Mar 25 2009, 06:25 PM

Thank to Mini Me for starting this thread, I now have my car back with the new main stat fitted. My carnow reaches operating temp of 90-91 very quickly, and from what i have seen so far the mpg have drastically improved. I will have a clearer idea once I have run it to work and back a couple of times. Thats a beer and a dram I owe you Mini Me, give me a shout if you are ever in Scotland.

Originally Posted by hey3688' post='826465' date='Mar 25 2009, 07:07 PM

mini me
when you changed egr therm did you have to bleed the system
i know the stat has a bleed screw but do you bleed with
engine running or off
cheers

Originally Posted by mini_me' post='826511' date='Mar 25 2009, 06:47 PM

I bled the system with the engine running and only used the screw on top of the EGR therm.
There was hardly any air in the system though.

Originally Posted by parmblagan' post='799296' date='Feb 23 2009, 12:57 PM

hi guys

i have this problem with low MPG with my car (average through town is 20 MPG from auto 525D 2005) want to get it solved as its costing me a packet. i have had a new air mass sensor put in and the MPG remains the same. had it remapped but the mpg remains the same. so after reading this topic i checked the temp. of my car and it gets to max of 84-86 depending on my speed, but usually takes about a 6 mile journey to acheive these temperatures.

this week end i removed the egr thermo, and exaimed it. i too can blow air through it.

so my question is my car is getting up to 84-86 but i can blow through the EGR thermo, do i need to replace it?

Originally Posted by parmblagan' post='827120' date='Mar 26 2009, 12:16 PM

hi guys

been following this thread now for some weeks now. i have changed the EGR Thermo on my car and checked the temp. it seems to reach 90+ but it does take a while for it reach these kind of temps, maybe a good 10 mile run. today drove 2.9 miles and the car only reached 76 deg. with ambient temp of 10 deg.

thinking that my poor mpg is more than likely due to some problem to with temp of the car, maybe the main thermo is likely to be faulty. how can i check this out? does it cost a lot to put right?

and can some explain what is DPF REGENRATION, what does it do? how can i tell it works on my car?

Originally Posted by Stephen F' post='826105' date='Mar 25 2009, 10:04 AM

Hi,

I use Specialist Cars BMW in Stevenage and have done since 2004

I have had a long list of problems with my current car so know the staff at the service desk quite well, it has been in several times previously for poor fuel consumption at the same time as other issues. The service desk, the techs and the service manager have always been very helpful but unable to solve the MPG problem.

I am always very calm and polite with the staff no matter how frustated I am with the damn car - this makes a huge difference.

My car had previoulsy attained good mpg and the techs were aware of this, when I read about the EGR thermostat and cool running issue I investigated and found my car to be running cool.

As I have the BMW insured warranty with a ?100 excess I bought the thermostat myself for ?22 and spent the 10 mins fitting it. It made quite a difference but still not up to temp so I popped in to the dealer mid afternoon when I knew it would be quiet and showed them the broken EGR thermostat, explaining whole thing and that I initially got the info from a BMW forum

One of the techs (paul I think) came and had a look at it and immediately agreed that cool running would mean poor MPG stating the car should ruN at 90-91c and was surprised at the failed EGR thermostat stating he had never had to change one but stated that a failed open thermostat would not show up on the diagnostics.

I mentioned that it was still not attaining full running temp and the main thermostat was probably also faulty, he agreed that this was probably correct as there is no other reason for the car to run cool so they agreed to order a new main thermostat and do the work under warranty.

My car also doing DPF regeneration every 400-450 miles

On collecting the car I was informed the tech had driven the car before and after to confirm the temp readings and was really pleased the problem had finally been solved with the car now reaching normal temp very quickly.

I was asked to run the car for a few tanks and to let them know how it was going.

The thermostat problem is clearly affecting a lot of cars with very few being resolved as most are undetected, I would suggest trying a different dealer or even Specialist Cars at Stevenage, speak to Jim at the service desk and he will know all about it.

Or get your dealer techs to contact Specialist Cars to confirm changing the thermostat cured the cool running on my car.

My MPG is now 37 with mixed short journeys compared to 27-28 before the thermostats were changed!!!

On the motorway it will now sit above 40mpg where it used to refuse to go above 30mpg.


Solving this problem will save countless wasted visits to dealers and a lot of frustration for owners and dealer service departments

Do you have a BMW or a third party warranty??

Not sure how you would get on if it is a third party warranty.


Please feel free to PM me and leave your phone number and I will give you a call if you need any more info


Stephen

Originally Posted by parmblagan' post='827120' date='Mar 26 2009, 01:16 PM

hi guys

been following this thread now for some weeks now. i have changed the EGR Thermo on my car and checked the temp. it seems to reach 90+ but it does take a while for it reach these kind of temps, maybe a good 10 mile run. today drove 2.9 miles and the car only reached 76 deg. with ambient temp of 10 deg.

thinking that my poor mpg is more than likely due to some problem to with temp of the car, maybe the main thermo is likely to be faulty. how can i check this out? does it cost a lot to put right?

and can some explain what is DPF REGENRATION, what does it do? how can i tell it works on my car?