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Old May 1st, 2013, 11:32 AM
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engine chokes at full throttle

Hi everyone,
Yesterday i've noticed a strange problem on my MCS. When I accelerate, the car seem to choke (sounds like anti-leg ) for a few moments and keep revving. It only happens at full throttle and every time in different revs. It doesn't happen if I accelerate pretty hard but not at full throttle.

Any one encountered such a problem?

Dean
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Old May 1st, 2013, 04:45 PM
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It could be the engine rev limiter kicking it to stop you over revving it, that gives like a misfire effect until you ease back on the revs and then it picks back up.
I believe these things can be adjusted or even overridden by altering the parameters in the ECU
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Old May 1st, 2013, 05:20 PM
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Why is the rev limiter kicks if I'm not even close to the red line?
It's also something I didn't have before....
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Old May 1st, 2013, 08:35 PM
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Fuel filter was last changed when?
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Old May 4th, 2013, 03:12 PM
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According to the car history the fuel filter never been changed
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Old May 7th, 2013, 08:40 PM
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Then I would try changing it and see if that doesn't solve your issue.
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Old May 7th, 2013, 09:03 PM
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Do your service records show that the high pressure fuel pump has been replaced? I didn't note a year model on yours, but the 2008 MCS had a recall for the HPFP. I had over 50,000 miles before mine became a problem.
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Old May 8th, 2013, 12:47 AM
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Quote: Originally Posted by dean (original)
It only happens at full throttle and every time in different revs. It doesn't happen if I accelerate pretty hard but not at full throttle.

Quote: Originally Posted by dean (original)
Why is the rev limiter kicks if I'm not even close to the red line?

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Old May 8th, 2013, 08:54 AM
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Quote: Originally Posted by Hartge220 (original)

I believe what he is trying to say is that the rpms stop increasing before the redline which seems to suggest fuel restriction.

This is due either to:

- a very dirty fuel filter
- a problem with the HPFP

I would suggest that since this only occurs at WOT, he attempts the cheaper solution of replacing the fuel filter. If that doesn't work, he should pursue the HPFP angle.
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Old May 8th, 2013, 11:48 AM
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Quote: Originally Posted by MiniDeLux (original)
I believe what he is trying to say is that the rpms stop increasing before the redline which seems to suggest fuel restriction.

This is due either to:

- a very dirty fuel filter
- a problem with the HPFP

I would suggest that since this only occurs at WOT, he attempts the cheaper solution of replacing the fuel filter. If that doesn't work, he should pursue the HPFP angle.

Sounds like good advice to me - always best to rule out the cheap / simple stuff first.

Not sure if it's the case on Minis but on Subarus (which is where my background lies), a faulty fuel pressure regulator isn't unheard of and that can also have similar effects.

It's also possible that the ECU is detecting knock at WOT and is pulling timing which would certainly feel like the engine was "choking". If the fuel pressure is down, then knock could well be a side effect of that.

Also, what fuel is being used? SUL obviously being more resistant to knock than normal 95 RON fuel. If you're using 95 RON, it could be worth putting a couple of tanks of SUL through to see if it makes a difference.

On Subarus, there's an open source application called ROMRaider that allows you to log via the OBDII port - not sure if there's a similar tool for MINIs / BMWs - but it's very useful when diagnosing issues to be able to log what's going on.

Now: 2005 R52 MCS
Plus: BMW X3 3.0d, BMW Z3 2.8, BMW F700GS, Vespa ET4 125
Was: 04 R52 MCS, 06 R53 MCS
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Old May 8th, 2013, 07:24 PM
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Very good points as well. Could be due to fuel quality.

Start with the basics, work your way up...
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