Drivetrain slack?

M

Maniac

Elite
In recent months I've noted what feels like drivetrain slack. A slight clunk/slam when letting off the throttle or when engaging throttle on a slight incline. It's not all the time and I'm sure when I first bought the car it didn't do this. I'm not sure if I'm imagining this. Any older DCT car owners out there that can confirm if they feel this?

I know I had this in my e85 but can't recall feeling it before on the e89. That churr churr churr sound as you let off the throttle and the car slows or slight thump when you press the throttle after coasting.

I'm not sure if I'm being sensitive or whether I should take it into the dealer. I've read some 23i owners with diff issues and wonder if this is a diff issue or just me being picky. As it's not bad I suspect the dealer will go 'dunno'.
 
Keep the warranty up to date and try not to worry!

Slack in the drive train doesn't go away sometimes ( unless you've taken up the backlash)
 
I have manual transmission and surprised how clunky the drive is when I first move off cold.
Sounds like slack in the diff area if you jab the clutch in and out.
After that I don't notice.
 
It could well be me then, looking for faults as ever. I'll put it down to temperatures and contraction of components unless it doesn't improve in summer. For the most part the DCT seems smooth and takes up slack seamlessly but just now and then there's a thump as I come off and then back on the throttle,
 
Does it do it when going through the box or into 1st? It can be a common BMW trait as they age. My Z3 clunks when engaging 1st and going up through the manual box, nothing serious just a slight clunk, doesn't do it though when going off the throttle. It's done it the past 7 years and never got any worse. BMW checked it and said all was ok. Unsure on the Z4 but on the 3 there is rubber doughnut that sits between the drive shaft and gearbox and designed to stop any backlash etc. As they perish you get the clunking. Might be worth checking out.

Tim.
 
Could be the mountings of engine and/or components rather than mechanical wear in the units themselves, not sure how stuff is mounted on the E89
Biggest cause of slop on any car I remember was engine mountings after high mileage, what mileage are you up to Maniac?
 
Brasseye said:
Best sell up quick and git rid of those wheels too before selling !
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Haha nice try ;) she's a keeper unless the bank balance gets in the way. I don't put effort into things to give em away and God I've out effort into this car lol
 
The gearbox can be a little clunky sometimes, I don't think you have anything to worry about.

Once you start focusing on a problem it's hard to move on.


Have you decided if you are going to tune the car yet? If you are still thinking about it there is a new flash tune coming to the market in the next couple of months that will be using Android devices and a standard K+DCAN cable. Should seriously move the game forward on this platform. No word on cost yet but I'm expecting it to be a lot cheaper than anything currently out there.
 
I have noticed a similar issue of late, and have found that one of the driveshafts seems to have a tiny amount of slack in it when jacked up with the wheel removed. My diff also seems to be making more noise of late too although only noticeable when accelerating at slower speeds on smooth tarmac. I do have 84000 on it now though, so probably to be expected...
 
Does anyone know if there's a non dealer approach to resetting the adaptations for throttle and DCT on the e89? I'd like to try this to see if it helps. I've read some weird stuff online like pulling on paddles in N at 40mph. Sounds daft to me.
 
Fairly sure the Delphi system can do the throttle, not sure about the DCT, as I don't have the option so would need to plug it in to a car with it present.
 
Maniac said:
Does anyone know if there's a non dealer approach to resetting the adaptations for throttle and DCT on the e89? I'd like to try this to see if it helps. I've read some weird stuff online like pulling on paddles in N at 40mph. Sounds daft to me.
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Very few coding tools allow you to fully reset adaptions.

You either need to use INPA (BMW Standard Tools), BT Cable or the OpenFlash Tablet.
I don't think the BMWhat app or COBB AP are capable of resetting them.

I've never tried the manual method. Here's the procedure if you want to give it a try (copied from 1addicts forum):

1. Keeping your foot off the brake hit the start/stop button.
2. Hold the gas pedal down for 25-30 seconds (apparently at around 25 seconds you will hear the transmission reset to factory settiings)
3. Start the car and you are all set.
 
I'm having a somewhat similar problem. I get a clunk when i engage reverse year. I also get a similar clunk although not so obvious when i decelerate and stopping. Sent it in to BMW and the first time, they told me they replaced the output flange. The problem remained and the second time they replaced the final drive. It's been about 2 weeks since this was done and I'm still getting the clunk when engaging reverse gear. The only thing different now is that i get it intermittently and not all the time when i engage reverse gear.
Has anyone experienced this problem? My car is still under warranty and i have logged 40,000 km but it is running out in two months time.
Appreciate your response.
 
Interestingly the issues I've had seem to be lessening as the weather warms up so perhaps its just mechanical/material contraction in the cold weather. In any event it seems ok at the moment. The thing with repairs is that they rarely fix anything, like that alternator they replaced to rid me of the whine.. it still whines and now I have a cold start warble noise from an idle pulley. I'm not taking it back again until something properly breaks off.
 
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