[NathanJT]

Well, I can only think that it just needed a bit of a good blow out. I've been driving the car like I stole it all weekend and it hasn't done it since

[E92-Mark]

Never experienced anything like that, but I drive mine as if theres a fire on the back seat the whole time anyway

[mjh93sa]

Originally Posted by E92-Mark

Never experienced anything like that, but I drive mine as if theres a fire on the back seat the whole time anyway

That's how my loan 330d SE gets driven.

Never noticed any hesitation on my car or this one.

[zoltan_tms]

It seems to be a common problem,mine feels the same when driving relaxed.
2006 330d manual.

[jingle68]

Originally Posted by NathanJT

No, this is definitely NOT turbo lag as it happens in the rev rage where the turbo would be spooled up and working. Lag only occurs when you're effectively waiting for the turbo to kick in.

This feels almost like a misfire on one cylinder and happens for a split second.

I'm wondering if it is in fact a dodgy batch of fuel?

My 2007 E92 330d SE auto has started doing EXACTLY the same as how you describe , its done 27k miles and has had this problem for about 500 miles now.
Its very noticable when cruising at anywhere between 50 -90 mph when i am just 'feathering' the throttle (if that makes sense?) , i describe it as a sudden jerk/hesitation ,and its not only when accelerating.

There is another thread on this forum with others having the same issue?

http://www.e90post.com/forums/showthread.php?t=21514

I have been into my dealer & they cannot diagnose the 'misfire' unless it gets worse first in order to find the fault.

I might invest in a new fuel filter ,even though its replacement isnt due until 60k , It will hopefully eliminate poor fuel.

We had major issues with fuel pumps & filters blocking up with a thick black oily substance on VW passat diesels 2 years ago which resulted in a worldwide recall of the fuel pump.
VW put it down to the fuel quality but the dealers were not convinced.

[milesr3]

My 535d started doing this a while back. A slight drop in revs and deceleration when applying the throttle very very gently when cruising along in 6th at around 1,500 rpm. Feels a bit like feathering the brakes when you are expecting acceleration. I took the senior tech out for a test drive an he agreed it wasn't right. Reading the job sheet afterwards, he'd test driven it himself 3 times when I left it with them and concluded that it got worse as the car warmed up.

In the end they diagnosed that the DPF was requesting regeneration, but that conditions had not been met. At the time I didn't understand this because I do plenty of long runs, but they forced it to do a DPF regen and from what I can gather by the amount of fuel left in the tank and the average mpg falling off a cliff, thrashed the tits off it for a while, which cured the problem.

Mine still does it inconsistently some of the time now too and has recently started to really hesitate very badly leading to it having a new DDE unit fitted last week and being left at the dealers again yesterday for who knows what else...

[Walesy]

I have this on my 320d (163) also, got the BMW area manager looking at it soon at my local dealers as the dealership supervisor says he cant throw labour at it as it is not a consistant issue. But I have read up and the EGR seems to be the problem in some cases, so just need to wait and see.

[craig2859]

Have got this on my 330d - now and again.

Stuck in traffic doing around 45/50, just "moving" along, and it will blip like a split second misfire .... and then be ok for a while, only ever happens when stuck in this kind of traffic ... it makes me feel like I need to change from 4th down to 3rd, but thats too high, so I change back up etc, etc.

I need to give it a thrashing I must admit, have been cruising around a little too much recently

[Dr Dave]

I'd say this was an EGR issue.......

[craig2859]

Originally Posted by Dr Dave

I'd say this was an EGR issue.......

erm.... EGR being ?

[Dr Dave]

Exhaust Gas Recirculation - happens at cruise conditions.

[craig2859]

so is that a "normal" condition then Dave, and if so is there anything you can do to check and confirm it is ??

[jingle68]

Originally Posted by Dr Dave

Exhaust Gas Recirculation - happens at cruise conditions.

I was speaking to one of our (VW) master tech's today , describing to him the symptoms of what we are experiencing and he thinks it is
'EGR bump' , thats how the technical dept at VW describe it.
It is known to happen on 2.0 TDI engines & there is no fix but it wont cause any problems.Something to do with pressure build up & change in the EGR system.

So it sounds like you could be right Dr Dave.

[milesr3]

I got my car back from the dealers yesterday and they had been unable to reproduce and thus diagnose the problem. Then right on cue it started hesitating on the way back home from the dealer.

Without a fault code to tell them which part to change they are clueless and they aren't prepared to investigate the cause.

I drove the car again today over a similar distance and it was fine.

Whatever is causing the hesitation in mine, it's intermittent and gets worse as the car warms up. It feels like the airflow is being restricted by something, hence the throttle response is poor and you have to give it a good shove to make the car respond. Just easing the throttle down causes the revs to drop and the car feels like it is decelerating, but it isn't - it's just that it's not accelerating.

In my case, it feels a lot like a DPF regeneration but it might not be one. AIUI cyclic regeneration of the DPF is performed by restriction of the air intake flow in combination with 1 or 2 post-injection phases. Mine feels like there is a restriction of the airflow when it happens. What is it that restricts the airflow for a DPF regen, or is this done by the throttle with the EGR valve opening more to compensate? I wonder if it isn't simply that my EGR valve is blocked...

[Frosticles]

Originally Posted by milesr3

Whatever is causing the hesitation in mine, it's intermittent and gets worse as the car warms up. It feels like the airflow is being restricted by something, hence the throttle response is poor and you have to give it a good shove to make the car respond. Just easing the throttle down causes the revs to drop and the car feels like it is decelerating, but it isn't - it's just that it's not accelerating.

In my case, it feels a lot like a DPF regeneration but it might not be one. AIUI cyclic regeneration of the DPF is performed by restriction of the air intake flow in combination with 1 or 2 post-injection phases. Mine feels like there is a restriction of the airflow when it happens. What is it that restricts the airflow for a DPF regen, or is this done by the throttle with the EGR valve opening more to compensate? I wonder if it isn't simply that my EGR valve is blocked...

I know this is rather an old thread but I'm wondering if anyone has been able to diagnose this problem. My 2007 (57) E91 330d M Sport has started doing this exactly as the above. Starts & runs perfectly from cold but once it gets warm the miss/Hesitation begins at roughly 1500 rpm. My car has had the DPF removed so it can't be trying to re-gen?? When the problem occurs I notice quite a bit of smoke from the exhaust.
I have run BG244 fuel system cleaner through it but the problem still persists. I don't think that it's an injector problem as it only happens when it's warm. I suspect maybe a sensor breaking down??


Any help at all would be greatly appreciated.

Kind regards, Kevin

[Exxie]

I'd say EGR.

I had this problem on my 330d but since having the DPF removed and corresponding tune, I haven't noticed it. My EGR isn't physically deleted, but its function has been removed from the tune.

I'm actually now looking into fitting an EGR delete pipe, but from most accounts it makes no measurable difference. I still like the idea of removing that massive obstruction though...

[335DEE]

Check your water temps by enabling the hidden menu. Thermostats go weak quite quickly and don't allow car to achieve hot enough temperatures to go into DPF regen ( or are just hot enough but choke when running a regen because extra fuel is dumped into the DPF)

[jean019]

+1 thermostat is a classic issue on m57n2 (not complicated).
If you want to check temperature without going hidden menu each time you start the car, you can try the Ultragauge. That's what I bought for my e90.

[ade146]

most of those posts are classic egr symptoms seen on any car with egr fitted