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Author Topic: Dead spot around 1800 rpm?  (Read 1077 times)

Offline dr. benway

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Dead spot around 1800 rpm?
« on: 01 February 2011, 14:48 »
I've had a long-standing problem with my AUM where occasionally when accelerating in 1st I'll get a sudden power drop at about 1500-1800rpm. How hard the acceleration is doesn't seem to affect it but it's certainly more noticeable under hard acceleration. I thought it might be the MAF but it's still doing it every so often after replacing that.

It's almost as if the ECU is dropping the power but I don't get the traction control light. No fault codes. Anyone any ideas what might be causing it?
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Offline p11jon

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Re: Dead spot around 1800 rpm?
« Reply #1 on: 01 February 2011, 16:18 »
misterious banging from underneath now powerloss? you ent having much in the way of luck fella are u.   :undecided:
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Offline Mr_Orange

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Re: Dead spot around 1800 rpm?
« Reply #2 on: 01 February 2011, 17:10 »
Quote from: dr. benway on 01 February 2011, 14:48
I've had a long-standing problem with my AUM where occasionally when accelerating in 1st I'll get a sudden power drop at about 1500-1800rpm. How hard the acceleration is doesn't seem to affect it but it's certainly more noticeable under hard acceleration. I thought it might be the MAF but it's still doing it every so often after replacing that.

It's almost as if the ECU is dropping the power but I don't get the traction control light. No fault codes. Anyone any ideas what might be causing it?

Our AUM used to suffer with this occasionally.  What cured it was hard to pin down as I noticed it had gone after fixing and replacing quite a few different things.  My money would be on a small boost leak I found at the turbo elbow outlet pipe (though yours could be anywhere on charge side).  Have you checked for fault codes?  17705........?  :sick:
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Offline richw911

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Re: Dead spot around 1800 rpm?
« Reply #3 on: 01 February 2011, 17:15 »
As said boost leak  :undecided: Split pipe somewhere  :undecided:

TB clean?
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Offline dr. benway

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Re: Dead spot around 1800 rpm?
« Reply #4 on: 02 February 2011, 09:44 »
Quote from: p11jon on 01 February 2011, 16:18
misterious banging from underneath now powerloss? you ent having much in the way of luck fella are u.   :undecided:

Ha, it never rains... this is after the other problem I had (must update the thread) with the secondary air pump and hoses  :cry:

As it happens these two things aren't really that much of a worry; hardly carry passengers and the power loss is reasonably rare, and only in first. Other than that it's running lovely  :grin:

The TB was recently cleaned out (< 1 yr), so I'll have a check over the turbo piping. I had 17705 a while back but that seemed to be to do with the secondary air that's been recently fixed and hasn't come back since.

Cheers gents.
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