Engine Dead Spot/Acceleration Niggle?
08-21-2009, 02:37 AM
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Hi All,
I've had my 2006 525 manual diesel for 3 weeks now and have noticed at certain revs, say 1400 and 1600 that if you accelerate slowly through these revs (for example while driving in traffic) the car seems to temporarily jerk at these points. Its most noticeable when in 1st gear and driving on flat ground. If you accelerate quickly then its not noticeable.
Any ideas on what this is or whether I need to worry about it? Its a niggle at this stage but I would really like it to be fixed as I spend about 50% of my commute to work in slow moving traffic.
Thoughts or suggestions please whilst its still within the 30 days BMW guarantee?
Thanks,
Steve
I've had my 2006 525 manual diesel for 3 weeks now and have noticed at certain revs, say 1400 and 1600 that if you accelerate slowly through these revs (for example while driving in traffic) the car seems to temporarily jerk at these points. Its most noticeable when in 1st gear and driving on flat ground. If you accelerate quickly then its not noticeable.
Any ideas on what this is or whether I need to worry about it? Its a niggle at this stage but I would really like it to be fixed as I spend about 50% of my commute to work in slow moving traffic.
Thoughts or suggestions please whilst its still within the 30 days BMW guarantee?
Thanks,
Steve
08-21-2009, 02:46 AM
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My Ride: Alpine White 2006 530Xi (SLD)
I suggest you switch jobs and find a place to work, where you won't have to travel to and from work in slow traffic 
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Seriously speaking, I have a petrol 530 manual and it jerks a little here and there at times - its just the torque band of each engine is different. I'm guessing that in your 525's engine torque delivery there are a couple of point where torque "spikes", causing these jerky reactions - at least that's what I attribute my jerkiness too. Unless it happens during clutch engagement - then its most likely you not holding the clutch down long enough, releasing the pedal too abruptly. Since you do have the guarantee from BMW, I would suggest taking the car in to have it checked out based on this jerkiness - it sounds like a valid enough reason and if anything is wrong - even if they don't find it now, you'll have proof that you complained about it right away, so if it ends up turning into a problem down the road, you'll have grounds to force them to fix everything under good will.
BTW
to the "club"Seriously speaking, I have a petrol 530 manual and it jerks a little here and there at times - its just the torque band of each engine is different. I'm guessing that in your 525's engine torque delivery there are a couple of point where torque "spikes", causing these jerky reactions - at least that's what I attribute my jerkiness too. Unless it happens during clutch engagement - then its most likely you not holding the clutch down long enough, releasing the pedal too abruptly. Since you do have the guarantee from BMW, I would suggest taking the car in to have it checked out based on this jerkiness - it sounds like a valid enough reason and if anything is wrong - even if they don't find it now, you'll have proof that you complained about it right away, so if it ends up turning into a problem down the road, you'll have grounds to force them to fix everything under good will.
08-21-2009, 03:49 AM
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Originally Posted by v_therussian' post='984357' date='Aug 21 2009, 11:46 AM
I suggest you switch jobs and find a place to work, where you won't have to travel to and from work in slow traffic
BTW to the "club"
Seriously speaking, I have a petrol 530 manual and it jerks a little here and there at times - its just the torque band of each engine is different. I'm guessing that in your 525's engine torque delivery there are a couple of point where torque "spikes", causing these jerky reactions - at least that's what I attribute my jerkiness too. Unless it happens during clutch engagement - then its most likely you not holding the clutch down long enough, releasing the pedal too abruptly. Since you do have the guarantee from BMW, I would suggest taking the car in to have it checked out based on this jerkiness - it sounds like a valid enough reason and if anything is wrong - even if they don't find it now, you'll have proof that you complained about it right away, so if it ends up turning into a problem down the road, you'll have grounds to force them to fix everything under good will.
BTW
to the "club"Seriously speaking, I have a petrol 530 manual and it jerks a little here and there at times - its just the torque band of each engine is different. I'm guessing that in your 525's engine torque delivery there are a couple of point where torque "spikes", causing these jerky reactions - at least that's what I attribute my jerkiness too. Unless it happens during clutch engagement - then its most likely you not holding the clutch down long enough, releasing the pedal too abruptly. Since you do have the guarantee from BMW, I would suggest taking the car in to have it checked out based on this jerkiness - it sounds like a valid enough reason and if anything is wrong - even if they don't find it now, you'll have proof that you complained about it right away, so if it ends up turning into a problem down the road, you'll have grounds to force them to fix everything under good will.
08-21-2009, 06:17 AM
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My Ride: 2008 550I LOADED, all options except HUD and NV
Originally Posted by e6t' post='984395' date='Aug 21 2009, 06:29 AM
man... gotta hate the niggles...
RACIST!!!!!!!
So what you got against niggles, huh, huh!?!!?!?!?!?
08-21-2009, 09:40 AM
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Originally Posted by turboawd' post='984450' date='Aug 21 2009, 03:26 PM
could that jerkiness you feel, be the intake flaps moving position, or maybe the turbo increasing boost?
It also feels like the throttle doesn't actually do anything until its travelled a good few millimetres, maybe a centimetre or two. Is this normal?
Thanks,
Steve
08-21-2009, 09:44 AM
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My Ride: 2008 550I LOADED, all options except HUD and NV
Originally Posted by steve.r' post='984648' date='Aug 21 2009, 10:40 AM
I don't know, so I'd ask the same question to any guys in the know
It also feels like the throttle doesn't actually do anything until its travelled a good few millimetres, maybe a centimetre or two. Is this normal?
Thanks,
Steve
It also feels like the throttle doesn't actually do anything until its travelled a good few millimetres, maybe a centimetre or two. Is this normal?
Thanks,
Steve
Yes, actually it is, we have drive by wire systems and they all have a lag - which is why a lot of members are installing these:
https://5series.net/forums/index.php...opic=83923&hl=
08-21-2009, 10:40 AM
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My Ride: 2006 525XI, Jet black on Dakota beige. Premium and winter packages. I consider myself a purist and intend to keep my car absolutely stock and shiny.
2008 328I Convertible, Sapphire black on beige interior. Premium package, NAV, iPod adapter.
Retired: 2002 325I, Titanium silver on black leather. Premium package. Absolutely stock and proud of it.
I actually did a double take and had to look up the word "niggle.' Is it commonly used in Britain? I may use that word more often, now that I know its meaning. I might start by asking my boss what one needs to do to niggle as effectively as he does.
I like the sound of it, though: niggle, niggle, niggle.
I like the sound of it, though: niggle, niggle, niggle.