Just thought I'd post another update. I've had the car in to a BMW specialist garage (not the dealership). They spent a few hours yesterday on the car trying to find out why I'm having these issues with power. Anyway, they've got back to me and told me all the hoses were on the wrong way round for the EGR intake etc. So it sounds like when BMW had it last when they replaced the EGR valve or when it went in for the recall to check the part, they've put all the hoses on the wrong way round, so I've been driving round without that working for god knows how long now.

They also found 6 permanent fault codes with the intake manifold, so now this needs replacing which they believe was the cause of the power issues.

 

Ok so the problem returned today. Looks like my original joy at the 50p fix was short-lived. Booked it in with BMW but the only available date they had was 5th May. Oh, and they're charging me £149 per hour to look at it/run diagnostics.

 

Strange one that.
I thought about the 1.7pis and thought what is the point in driving on a totally flat tyre lol.
I knew you ment bar.

 

Haha yeah sorry mate, glad you knew what I meant though! 😂 To look at visually the tyre looked fine though you wouldn't of even thought it needed any air putting in. The main reason I was thinking it was the car reducing the power itself was because it also wouldn't allow me to put it into sport or sport+ mode, so was thinking this was just another way of it maintaining stability by reducing the power. Either way, happy it only cost me 50p to sort out haha!

 

would cut power if the abs/dtc was cutting in,but as said i doubt it would cut power unless u see the lights for dtc etc

 

The car wouldn't let me put it into sport mode or sport + either which is why I've been leaning towards the car reducing the power to maintain stability? Either way, it cost me 50p to sort out instead of being a bigger issue and costing hundreds haha!

 

You threw me with 1.7psi as that is totally flat and would cause drag, so it was 1.7bar and now corrected to 2.1bar. I still find it highly unlikely the tyre pressure would cause power reduction by the dme. I had a puncture on my 330d I drive warned me about it but there was no power reduction other than my right foot.
I think it’s more likely whatever was causing it has coincidentally cleared itself, time will tell I suppose.

 

Yeah bar sorry. Visually the tyre certainly wasn't flat though, to look at you wouldn't even think it needed any air putting in. It wouldn't allow me to put the car into Sport mode or Sport + either so it wouldn't of surprised me if it was the cars computer reducing the power. Hey ho, it cost me 50p to sort out though in stead of it potentially being a bigger problem costing ££££ haha!

 

Can’t see the dme would reduce power due to low tyre pressure, but that will cause drag if it’s that low.
Starting point is obviously tyre pressure first and then car will need plugging in to see if any codes logged and see what live data reveals

 

Hi mate

Thank you for your reply. I was just about to post an update as it happens! Turns out it was all completely related to the tyre pressure! It was at 1.7psi when it needs to be at 2.1psi. Never had this happen before but I don't know if I've ever had a tyre psi that low before to be honest. Anyway, as soon as I'd put some air in and reset the tyre pressures it was back to normal pulling in all gears.

Must be a safety feature that if the pressure in any tyre drops to a certain level that it drops the engine power?!