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Author Topic: Sudden loss of power/misfiring around 3500rpm  (Read 1363 times)

Offline hegemon

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Sudden loss of power/misfiring around 3500rpm
« on: August 27, 2015, 06:14:33 pm »
Any idea what this might be caused by?

No fault codes logged, annoyingly.

https://www.dropbox.com/s/fvhqkipgs3vguii/Video%2027-08-2015%2018%2001%2037.mov?dl=0

It definitely seems worse under load.
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Offline john87

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Re: Sudden loss of power/misfiring around 3500rpm
« Reply #1 on: August 31, 2015, 08:32:16 am »
My money would be on a failing coil pack or packs.. misfiring under load is usually caused by this.
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Offline hegemon

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Re: Sudden loss of power/misfiring around 3500rpm
« Reply #2 on: September 15, 2015, 03:06:41 pm »
Turns out to have been the crank speed sensor. I got it to throw up an "Implausible signal" fault code by revving the engine fairly aggressively a few times with the engine out of gear. I'm sure my neighbours understand.

New sensor and fitting worked out to be around £200.
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