View Full Version : BMW 535d - odd smaller turbo problem
Right, got a 54 plate 535d, 80k on it. Full BMWSH, yadda yadda yadda.
When starting from cold (i.e. first thing in the morning - or after 8 hours outside work) it performs flawlessly, until I turn the engine off.
Now, if I stop for for fuel/shopping/etc and switch it back on, I have no small turbo. There's no strange noise, just doesn't engage. If I get the revs up enough, the large turbo comes online, no problem and it flies, like it should.
The only way I get the smaller turbo to work again is to leave it overnight or for a few hours. I left it for 3 hours last night and that wasn't long enough, but this morning, all was well.
This has only manifested itself in the last 72 hours, there's no smoke, no warnings on the iDrive.
I'm going away to Portugal for the weekend, so I've not booked it in with BMW yet, till I get back, but I was wondering if anyone knows what that is? Or what it only works after some period which is greater than 3 hours...
Are you sure its not a single variable vane turbo thats stuck open when hot, its a common problem as they get sooted up.
EDIT: my mistake, a little googling and it does indeed have a small and larger turbo in sequential operation :search:
Are you sure its not a single variable vane turbo thats stuck open when hot, its a common problem as they get sooted up.
EDIT: my mistake, a little googling and it does indeed have a small and larger turbo in sequential operation :search:
lol yep -- i know my cars :)
Junk all that sequential crap and fit a big single? :D
Well if it's actually got a small and large turbo, then it's completely different to the Supra seq system!! I'd imagine only a BMW person would have a clue what might be wrong!!
absolute pmsl - it's quick enough with its 550+lb/ft and there's no lag ... and it transitions better than the Supra stock twins... so no! :)
Well if it's actually got a small and large turbo, then it's completely different to the Supra seq system!! I'd imagine only a BMW person would have a clue what might be wrong!!
Yep. will throw it in when I get back - just seeing if there were any clever people on here ;)
Have you tried feeding £50 notes into the intake to see if that helps?
Have you tried feeding £50 notes into the intake to see if that helps?
Would rather do that than give them to you :p
I've seen this on other TDI's but don't know the cause...
Soop Dogg/Angie has it on their Audi A6 1.9Tdi...(and that's it's only tubby of course). Assumed it was an age thang as that car has done 150k miles AFAIK.
Could it be a sensor youth? Maybe when its cold the resistance is normal but when its hot the resistance has increased and causes a fault? Dont know the layout so Im clutching at straws... Id probably say electrical cos if it was mechanical wouldnt it be fooked all the time?
Could it be a sensor youth? Maybe when its cold the resistance is normal but when its hot the resistance has increased and causes a fault? Dont know the layout so Im clutching at straws... Id probably say electrical cos if it was mechanical wouldnt it be fooked all the time?
That's what I'm thinking as well, Craig. It could be a VSV-like device which is just not flowing.
I'll bung it in and get it looked at next week...
Just to update, I've had this fixed - a few weeks back actually - it was a small piece of vacuum pipe that had chaffed a little. Replaced, and many torques are restored.
If anyone's ever got this problem, it's under the engine cover, left side as you look at it.
*makes note for when I buy my retirement chariot*
fpmsl you sarcastic gheyer :)
I was in Leeds today and you never answered your phone!
fpmsl you sarcastic gheyer :)
I was in Leeds today and you never answered your phone!
*checks phone* - one missed call, oops.
I've been tinkering in the garage for most of the day so missed it ringing, apologies.
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