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Old 11-08-2012, 02:49 PM   #1 (permalink)
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Default Bike stuttering! :(

So here's the deal,

So i'm driving my bike for 2 months now, drove a little over 2000 km's on it.
It has a full akrapovic exhaust line on it.

Bike was handling normal until last week. I was driving home from work on the highway when I felt in an instant that something changed. Since then I knew that there was something wrong with it.
When driving at cruise speed, I felt that the bike was constantly going on and off the throttle, instead of a normal constant speed.

When I went off the highway and accelerated, the bike was stuttering HARD. it also sounded like some sort of Harley Not the screamy sound like it used to be. It's also backfiring alot more than usual.

Also in neutral, the bike was adjusting itself between 1-2k rpm, way too much to be normal.

My dealer where I bought the bike from, drove it as well and he said it has te be something in the mapping. But he couldn't touch the bike because it was in warranty by BMW itself, so he redirected me to them.

BMW hooked it up to a computer and found out that the ECU didn't recognize the akra exhaust so that the bike was still using the standard exhaust mapping, and that a 400€ activation key would solve the problem.

But could this really be the problem? Why now and not 2k km's back when I bought it. What if they are wrong so I'm left with a 400€ key and still a broken bike.

Could a PC5 fix this? Since it's half the price. Does it override the ECU with it's own mapping or is it better to register the exhaust in the ECU?

Or do you first need to register the exhaust and then install a PC5?

Is there anyone with this type of problem?

Last edited by KaoZ; 11-08-2012 at 02:56 PM.
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Old 11-08-2012, 05:04 PM   #2 (permalink)
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Quote:
Originally Posted by KaoZ View Post
So here's the deal,

So i'm driving my bike for 2 months now, drove a little over 2000 km's on it.
It has a full akrapovic exhaust line on it.

Bike was handling normal until last week. I was driving home from work on the highway when I felt in an instant that something changed. Since then I knew that there was something wrong with it.
When driving at cruise speed, I felt that the bike was constantly going on and off the throttle, instead of a normal constant speed.

When I went off the highway and accelerated, the bike was stuttering HARD. it also sounded like some sort of Harley Not the screamy sound like it used to be. It's also backfiring alot more than usual.

Also in neutral, the bike was adjusting itself between 1-2k rpm, way too much to be normal.

My dealer where I bought the bike from, drove it as well and he said it has te be something in the mapping. But he couldn't touch the bike because it was in warranty by BMW itself, so he redirected me to them.

BMW hooked it up to a computer and found out that the ECU didn't recognize the akra exhaust so that the bike was still using the standard exhaust mapping, and that a 400 activation key would solve the problem.

But could this really be the problem? Why now and not 2k km's back when I bought it. What if they are wrong so I'm left with a 400 key and still a broken bike.

Could a PC5 fix this? Since it's half the price. Does it override the ECU with it's own mapping or is it better to register the exhaust in the ECU?

Or do you first need to register the exhaust and then install a PC5?

Is there anyone with this type of problem?
If you just need to adjust the fuel then a PC or a bazzaz will do the job... do you have the O2s connected on the headers??
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Old 11-08-2012, 05:23 PM   #3 (permalink)
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I know a few riders that have the full Akro with the O2 sensors installed and they have NOT purchased the key, in fact our dealer says its not needed. Your issue sounds more like a bad coil pack causing one cylinder to be weak. But you may have to purchase the key to prove it.
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Old 11-09-2012, 01:12 PM   #4 (permalink)
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Do you guys mean the lambda sensor?
I have 1 sensor from akrapovic installed on the exhaust?
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Old 11-09-2012, 04:36 PM   #5 (permalink)
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Seems like O2 sensor died?

Try removing it. The bike will run a base map without one. A faulty O2 sensor will be adjusting the base map incorrectly.
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Old 11-09-2012, 06:53 PM   #6 (permalink)
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Sound like a bad O2. Unplug it an dif it stop. Get new or or pc5/Bazzaz. If you need O2 I have 2 sets.

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Old 11-10-2012, 02:19 AM   #7 (permalink)
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I wil try unplugging it and see what happens.
Is every O2 sensor the same? Maybe I can switch it with one of my original exhaust.
And if i'm correct, a PC5 doesn't need o2 sensors? (without autotune that is.)

EDIT: I've learned something today, I have 2 O2 sensors xD
Do I need to unplug them both or is 1 enough?

Last edited by KaoZ; 11-10-2012 at 02:40 AM.
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Old 11-10-2012, 08:24 AM   #8 (permalink)
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Unplug both and see what happens. Probably one is bad but do not know which one. You are correct, PCV does not need an O2 sensor unless you add Autotune.
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Old 11-10-2012, 09:11 PM   #9 (permalink)
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Default I had the same problem

You need a PCV with auto tune and that problem is gone...Make sure you follow the instructions on the installations



Quote:
Originally Posted by KaoZ View Post
So here's the deal,

So i'm driving my bike for 2 months now, drove a little over 2000 km's on it.
It has a full akrapovic exhaust line on it.

Bike was handling normal until last week. I was driving home from work on the highway when I felt in an instant that something changed. Since then I knew that there was something wrong with it.
When driving at cruise speed, I felt that the bike was constantly going on and off the throttle, instead of a normal constant speed.

When I went off the highway and accelerated, the bike was stuttering HARD. it also sounded like some sort of Harley Not the screamy sound like it used to be. It's also backfiring alot more than usual.

Also in neutral, the bike was adjusting itself between 1-2k rpm, way too much to be normal.

My dealer where I bought the bike from, drove it as well and he said it has te be something in the mapping. But he couldn't touch the bike because it was in warranty by BMW itself, so he redirected me to them.

BMW hooked it up to a computer and found out that the ECU didn't recognize the akra exhaust so that the bike was still using the standard exhaust mapping, and that a 400 activation key would solve the problem.

But could this really be the problem? Why now and not 2k km's back when I bought it. What if they are wrong so I'm left with a 400 key and still a broken bike.

Could a PC5 fix this? Since it's half the price. Does it override the ECU with it's own mapping or is it better to register the exhaust in the ECU?

Or do you first need to register the exhaust and then install a PC5?

Is there anyone with this type of problem?
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Old 11-16-2012, 04:59 PM   #10 (permalink)
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Did you fix the problem?
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