A45 Hard kick when accelerating

[Wkerswell]

Hi Guys,

New to the world of AMG having just bought mine this month. Have to say that I am very happy with it.
I do have one issue that does concern me though. Sometimes under quick acceleration I get a hard kick where the power drops off. This only happens for a second but you can really feel it in the car.

Some more information:
I managed to reproduce this today. I was going around 30/40 mph then planted my foot to accelerate (While in S on auto) The car took off for a bit then kicked hard. This was enough time before the gear change so I know it was not just shifting up. I then looped around the round about and did the same again but this time it was on a little lower RPM.
The car is a 2013 model. I never get this kick when I am in Manual

The car temp was:
Oil: 80/90c
Water: 80/90c
Gearbox: 50/55c

Does anyone know what this might be?

-Will

 

[rOckyAMG]

I think first reset your gearbox and then see if it happens again...

https://www.aclassclub.co.uk/forum/uploads/5483/IMG_1508.PNG

 

[Deletedmember130310]

Did the traction control warning illuminate?

 

[Wkerswell]

@rOckyC63 I have not tries that. I will give it a go now!

@Greenmanslk No there were no warning that appeared.

 

[Wkerswell]

@rOckyC63 Tried resetting the gear box and haven't had a kick since. Fingers crossed a reset was all that was needed.
It is worth noting the gearbox was a little warmer this time at 63c

 

[rOckyAMG]

@rOckyC63 Tried resetting the gear box and haven't had a kick since. Fingers crossed a reset was all that was needed.
It is worth noting the gearbox was a little warmer this time at 63c

I think give it try in the morning when cold.

 

[Revo]

Not Owned my A45 very long, only thing I've noticed is pulling away at a junction there's a slight delay and then a bit of a kick even when trying to pull away slowly, that's in comfort I don't know if same thing???? Ok under hard accelerating.

 

[Wkerswell]

@Revo I haven't noticed mine doing that but I have had a dual clutch for a while now and and fairly used to it. You have one before your a45?

 

[rOckyAMG]

Not Owned my A45 very long, only thing I've noticed is pulling away at a junction there's a slight delay and then a bit of a kick even when trying to pull away slowly, that's in comfort I don't know if same thing???? Ok under hard accelerating.

It might be worth checking if you have all the software updates on the gearbox. I presume it's pulling away in 2nd gear?

 

[rOckyAMG]

@rOckyC63 Tried resetting the gear box and haven't had a kick since. Fingers crossed a reset was all that was needed.
It is worth noting the gearbox was a little warmer this time at 63c

Any issues since?

 

[Wkerswell]

Haven't had a chance to test it out yet. Should have some time tomorrow night so will give it a go then

 

[Wkerswell]

Gave it a go last Saturday and seems to be ok now. Going to keep an eye on though

 

[nikh]

Not Owned my A45 very long, only thing I've noticed is pulling away at a junction there's a slight delay and then a bit of a kick even when trying to pull away slowly, that's in comfort I don't know if same thing???? Ok under hard accelerating.

A common problem and one that can be frightening with the delay, especially pulling away from a junction and then the kick. Mine does it, though, better after a replacement (warranty) gearbox which was replaced for another reason. I perform the throttle reset every 1-2 weeks and it alleviates the problem you're experiencing in Comfort mode.

 

[Wkerswell]

Ah just had it happen again to me. Seem again the gear box was around 52C so wondering if the lower temperature has something to do with it.

 

[Wkerswell]

Yeah just managed it again. Gear box was around the 54C mark. It was after a kickdown if that makes any difference.

 

[rOckyAMG]

Yeah just managed it again. Gear box was around the 54C mark. It was after a kickdown if that makes any difference.

I think ask if there is any updates for the box.

 

[Wkerswell]

I got the dealer to check and there are no software updates.
I have found someone with the same problem on another forum though and they have managed to capture the problem on video.

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[Revo]

I've watch the video over and over That sounds like its hitting a rev limiter, even though I can see its not, my car has never done that! If it did I couldn't live with that!!!

 

[Wkerswell]

Mine doesn't do it quite as bad as that and id inconsistent as to when it does it but yeah something that needs to get sorted.

 

[Deletedmember130310]

Faulty rev limiter kicking in too early?