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BabzF10
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29 Posts
Discussion Starter #1
Hello everyone.

A while since I've been on here, thanks to working 7 days a week ***x1f613;

So, my 2010 520d - which I've had for over 3 years has been great to me. No troubles at all, until December 2018. Timing chain rattle made short work of eating the better part of £800 (done by a local BMW specialist which I've used for servicing in the past). So, theres me quite happy thinking my car is back to being 'good as gold'.

WRONG!

Let me start off by saying, in no way do i think the problem i currently have is related to the timing chain and/or guides replacement.

2 weeks after the chain was replaced, I was joining onto a fast moving duel carriageway. I used the kick-down to gain speed and expecting the car to briskly gain speed as it always has - it didn't. Instead it very slowly increased in RPM and speed after it had down-shifted.

Never mind, i thought. Maybe it was just me not accelerating enough. Didn't think anything else of it. But then, a week after this i had 3 passengers in the car and were travelling on some road which were quite uphill, i noticed the car would be reluctant to gain speeds - not just on the inclines but also on fairly flat parts of the road too. It felt as if though something was causing a blockage or something. The DPF crossed my mind as i had not noticed a regen since it initially developed the problem

For a week or so after i would keep the car in Sport mode and drive a little briskly (of course as safely as i would normally) in the hopes the higher revs from the sport mode would clear any blockages. Seemed as though it didnt help, until last week, used the kick-down and the car briskly picks up RPM and speed. GREAT, i thought whatever was causing the problem has resolved itself. Also noticed the car regenerating 5 or so miles after (it regenerated 3 times in 2 days - not normal i know but i figured it's doing what it needs to do)

Again, driving on the motorway, attempted to overtake so i kicked-down, auto dropped down a gear or two and NOTHING. The revs from the downshift landed on just over 3000rpm and stayed there for 5 or 6 seconds until suddenly climbed speed (as if the engine suddenly woke up and realised i needed more power).

Since then i have had this problem on and off. Regardless of number of passengers, regardless of road incline etc. Put your foot down and very very slowly the RPMs and speed will increase.

I've searched online for a few weeks now but cannot find anyone who has a similar problem to me. Hence this post.

I have only noticed the problem when the engine temp is at 100°C. Before that it seems to drive normally (picks up speed just fine.) Apart from that, there are no other 'requirements' before the problem starts.


I have had the specialist have a look (he ran some diagnostics as well as taking the car for a test run) but reports no faults. Told me to keep an eye on it and call in again if the problem persists.

I'll be honest, it doesnt affect me as such during normal driving situations. But puts a downer on the whole driving experience knowing my car as an underlying fault where i can't pick up speed.

Any help would be massively appreciated.

Bit about my driving:
I use the car every day (minimum 30 miles - start stop traffic as well a short motorway journey.)
Only use Shell for fuel.
Never missed a scheduled service.
Keep the engine revs below 2k until the temp guage has reached 50°c.
Not afraid to put my foot down (until now)

Bit about my car:
2010 520d N47 engine @ 107k miles.
Sports automatic transmission.
Full service history (by BMW main dealer & BMW Specialists.)
Last time it was on a long motorway journey was at 99k miles.

Hope i haven't missed anything off this essay, but please ask as many questions and you can. Fingers crossed i can get to the bottom of this issue.

Thanks.
 

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Registered
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1,581 Posts
Some initial thoughts from past experience:

- air leak in the pressurized intake before the MAF sensor, on/off
- secondary fuel pump failing (i.e. the one usually found in the fuel tank if there is one there)
- when was the fuel filter last serviced? Intake air filter?
- DPF regenerations more frequent sound like trouble

Would do a full examination of the above and more....

My $.02

PL
 

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BabzF10
Joined
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29 Posts
Discussion Starter #3
Some initial thoughts from past experience:

- air leak in the pressurized intake before the MAF sensor, on/off
- secondary fuel pump failing (i.e. the one usually found in the fuel tank if there is one there)
- when was the fuel filter last serviced? Intake air filter?
- DPF regenerations more frequent sound like trouble

Would do a full examination of the above and more....

My $.02

PL
Thank you for your reply.

I really can't see it being an air leak as the car is perfectly normal until it hits the 100°c mark. There is plenty of power at any speed and at any rpm before this temp .

Fuel filter was last changed 94k miles.

Upon doing more research, i understand that early F10s were prone to a turbo wastegate issue. However, i cannot determine if my problem is consistent with the issues caused my this.

When they ran diagnostics on the car they reported no issues or faults which leads me to believe it could be a mechanical issue?

Regards.
 

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Munich Mark - 2014 535XD
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826 Posts
Let’s start by what has your BMW Specialist to say about the matter being that it happened shortly after the Timing Chain replacement.

Strange that no fault codes at all...

They are many Vacuum and Pressure Tubes / Lines that simply may be cracked, kinked or leaking after the work done and is what I would take a harder look at with your specialist...

Also, and this comes when all else has been looked at... Did you get a recall notice on the EGR Valve ? These Motors have issues > 100K Miles with Carbon deposits starting from the EGR, Plastic Intake Manifold up to the intake valves... A Borescope looking into the Mass Air Sensor downstream can give you an idea if it is time for a cleanup... Normally though you get some Codes around this as it happens...

I still suspect something related to the Timing Chain that set this off... most likely cause...
 

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BabzF10
Joined
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29 Posts
Discussion Starter #5
Let***8217;s start by what has your BMW Specialist to say about the matter being that it happened shortly after the Timing Chain replacement.

Strange that no fault codes at all...

They are many Vacuum and Pressure Tubes / Lines that simply may be cracked, kinked or leaking after the work done and is what I would take a harder look at with your specialist...

Also, and this comes when all else has been looked at... Did you get a recall notice on the EGR Valve ? These Motors have issues > 100K Miles with Carbon deposits starting from the EGR, Plastic Intake Manifold up to the intake valves... A Borescope looking into the Mass Air Sensor downstream can give you an idea if it is time for a cleanup... Normally though you get some Codes around this as it happens...


I still suspect something related to the Timing Chain that set this off... most likely cause...
Thank you for the reply.

I think it is just a coincidence that the trouble has started after the chain was replaced. However, I'll still be mentioning this next time i get the car looked at.

Regarding the recall for EGR valve, i have not recieved any recalls since i have owned this vehicle. Where would i find if a recall is out for this issue?

I have spent a LOT of time thinking about the problem. I just cant understand how the performance is absolutely normal at cooler temperatures but becomes problematic once the engine reaches optimum temperature.

I'll be getting the car booked in again once i get the opportunity, right now it's difficult to get it seen as I'm working 7 days a week. Finishing at 2AM and then being able to drop off the car at 9AM proves difficult for me.

Keep the suggestions coming, i appreciate them all. In the mean time if i find out the soloution, ill be sure to post my findings on here.

Regards
 

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BabzF10
Joined
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29 Posts
Discussion Starter #6
UPDATE

Had the specialist have another look at the car yesterday when the problem was apparent (last time he had the car the engine wasnt upto temperature and was unable to find the fault).

This time he took the car for a short drive and experienced the problem 1st hand, he immediately took it into the workshop and connected the diagnostics.

After about 10 mins he confirmed it was the DPF temperature sensor. He'll be able to price me up on the job tomorrow.

Fingers crossed, this nightmare of a problem will be fixed within the next few days. Will be sure to post my findings on here.

Regards
 

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BabzF10
Joined
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29 Posts
Discussion Starter #7
UPDATE

After a few weeks waiting to arrange a time for the car to visit the garage. I can safely say the car is fixed.

The issue was due to the exhaust gas temperature sensor being faulty, at roughly £60+vat from BMW it was a fairly inexpensive part. Onve fitted and taken for a drive, car was back to the same performance as before.

Just thought I'd update everyone you was keen to find out.

Thanks again.
 
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