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MG MGF Technical - Hissing Noise

Hello

I am not sure if my MGF has always made this noise and I just hadn’t noticed, but ever since I fitted an amp in the boot and ran the wires through the engine bay whenever I am in a low gear and get about 2.5K revs or higher, I can hear a hissing noise from the engine, It kind of sounds like a turbo does, could I have accidentally knocked something? Very odd, any ideas?

James
J Price

Did you create a hole from the cockpit to the engine bay to run the wires?

The noise could be coming from there.

Sam
Sam Murray

Sam

No I used holes that were already there(just made holes in the grommits) and I dont think it sounds like a trim noise.

James
J Price

Hi,

I also get this on my 1.8 MPI from about 3.5k upwards when accelerating hard.

I have mentioned it to people who seem to think it is nothing to worry about but an still intrigued as to what it is.

As a side note I have only noticed it since I had HGF.

Chris

Chris Uren

My old F did this as the revs passed through around 3500 - 4000. It was sort of a "pffffizzzzz" sound - Short duration, sounded as though some sort of gas was being vented in the engine.

I think the guys on here identified it as just being the catalytic converter releasing gases.

Anyway, it never caused a problem, and disappeared after about a week, never to return.

Diggers

Diggers

I have a similar "pfffzzzzzz" sound when accelerating hard, probly about 4500-5000 revs, started at weekend after I had a flexible exhaust connection (or some such thing) replaced under warranty...
C Ashworth

Hi,

I also had/have one of those, and it was identified as being the braiding round the exhaust flexi-pipe becoming detached and making the humming sound at certain revs.

This isn't the source of my rattle in the other post though!

Leigh
Leigh

This thread was discussed on 08/04/2003

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