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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > 435d low rev issues
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      11-17-2018, 07:37 AM   #1
Niicckk
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435d low rev issues

Hi all I have a 2016 435d and had a lack of low revs when pulling away from roundabout and dash put up drivetrain fault. Been to dealer and turned out to be a kink in a vacuum hose. Been ok for 4 days and now has intermittently returned. Just nothing when I put foot down.

Anyone experienced such issues before

Thanks
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      11-28-2018, 10:20 AM   #2
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Have you found out what the problem is yet, have you been to the dealers again to check for faults, does sound similar to others who have mentioned egr valve, best of luck
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      11-30-2018, 06:19 PM   #3
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Yeah sounds like possible EGR... I had the same a couple of months ago, 'drive line malfunction' etc when going to pull off.

I had a new EGR replaced under warranty at the time, with no mention of the cooler being a possible cause.

....and then just a few weeks ago I had the cooler replaced under the safety recall while in for service.
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      12-04-2018, 10:55 AM   #4
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Mines a 2016 435d and didnt think it fell under the EGR recall range. Not saying its not that but BMW have had it for 2 weeks and cant tell me what's wrong with it.
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      12-06-2018, 05:29 AM   #5
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A kink in the vacuum hose could only have been caused by human intervention during service / repair or you would have have this issue all the time. The symptoms you describe sound like the small turbo not being spooled at the correct time. I experienced just that when one of the vacuum pressure converters on my previous 535d failed ...no power low down then off it went as the revs rose. Sounds like you have a vaccum problem somewhere, either pump, vacuum line kinked or split [they must have been disconnected to become twisted], pressure converter [x2], or an actuator. BMW should be able to find this by simple process of elimination.

Keep us posted please.
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      01-03-2019, 02:46 PM   #6
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Update

Had report back from BMW and the following replaced.

A new high pressure turbo, feed and drain pipes for the turbo, Bypass pressure plate, New pressure converter for the wastegate valve , oil and filter change.

Picking car up tomorrow to drive 200 miles and see how it goes
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      01-14-2019, 07:09 PM   #7
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Wow, they seem to have replaced an awful lot, both mechanical and electrical components which would make me a little suspicious. That said I hope its fixed ......and that its a warranty job!
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      01-15-2019, 02:53 PM   #8
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Done 500 miles now and running fine. What would make u suspicious if u dont mind me asking
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      01-16-2019, 02:17 AM   #9
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Quote:
Originally Posted by cross90 View Post
Yeah sounds like possible EGR... I had the same a couple of months ago, 'drive line malfunction' etc when going to pull off.

I had a new EGR replaced under warranty at the time, with no mention of the cooler being a possible cause.

....and then just a few weeks ago I had the cooler replaced under the safety recall while in for service.
How did you have the cooler replaced for the recall? Two dealers i've asked said there's no parts available, and even the recall notice states no remedy is available as they're redesigning the part at bmw to not fail like the original part.

Did they just put a new cooler in with the existing part#?
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      01-18-2019, 06:18 PM   #10
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That is a very good question!

I was informed about the recall on the cooler when booking the car in for regular service, and to be honest didnt think much about it, presuming that the issue was being resolved via replacement with a non defective part.

I'll dig out the invoice when home and see part# against it.

Any idea what the pre recall part# should be ?



Quote:
Originally Posted by dieseldave View Post
How did you have the cooler replaced for the recall? Two dealers i've asked said there's no parts available, and even the recall notice states no remedy is available as they're redesigning the part at bmw to not fail like the original part.

Did they just put a new cooler in with the existing part#?
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      01-18-2019, 07:39 PM   #11
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Quote:
Originally Posted by cross90 View Post
That is a very good question!

I was informed about the recall on the cooler when booking the car in for regular service, and to be honest didnt think much about it, presuming that the issue was being resolved via replacement with a non defective part.

I'll dig out the invoice when home and see part# against it.

Any idea what the pre recall part# should be ?
I have no idea, but there's still no remedy as far as i'm concerned. I even called BMW N/A and the gentleman there told me there wasn't one either.
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      02-01-2019, 06:39 PM   #12
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Niicckk..... its just that they replaced almost everything around the large turbo, both mechanical and electrical [pressure converter] which would perhaps suggest that they were unsure exactly what the issue was so changed everything hoping to get lucky. Its an approach i have come across with BMW before but being old school I got them to explain their approach and by applying a simple, logical order to diagnose the problem [rather than plug in and fit all new parts to anything that had an error code!] it was simply a pressure converter failure on my previous 535d causing the boost problem rather than complete turbo failure as they suggested...... fixed for a fraction of their quoted price.
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      02-01-2019, 06:59 PM   #13
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Assassin hit the nail spot on the head.
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      02-03-2019, 12:48 PM   #14
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Thanks for the reply. Oh they definitely didnt know what they were doing. All I kept getting told was they have to follow there puma system which technicians follow and feed back test data
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