MK5 Golf GTI

All Things Mk5 => How to Guides / Troubleshooting => Topic started by: hegemon on August 27, 2015, 06:14:33 pm

Title: Sudden loss of power/misfiring around 3500rpm
Post by: hegemon 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.

Title: Re: Sudden loss of power/misfiring around 3500rpm
Post by: john87 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.

Title: Re: Sudden loss of power/misfiring around 3500rpm
Post by: hegemon 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.