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Author Topic: Funny Noise from Under Bonnet  (Read 1317 times)

Offline Nodz

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Funny Noise from Under Bonnet
« on: November 20, 2012, 06:05:24 pm »
Started the car up tonight whilst talking to a mate and there was a "ch ch ch" noise coming from under the bonnet which it has never made before. Even when it was at temp it was still making it. I've made a video below of the noise, just need some ideas on what it might be. All the levels are ok and the cambelt/water pump has been done within the last 2 years.

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Offline RENNTAG

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Re: Funny Noise from Under Bonnet
« Reply #1 on: November 20, 2012, 06:06:26 pm »
Video says its Private
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Offline Nodz

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Re: Funny Noise from Under Bonnet
« Reply #2 on: November 20, 2012, 06:09:17 pm »
Quote from: bendy on November 20, 2012, 06:06:26 pm
Video says its Private

Epic fail there on my part, all fixed now
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Offline RENNTAG

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Re: Funny Noise from Under Bonnet
« Reply #3 on: November 20, 2012, 06:14:01 pm »
Working now  :happy2: - but i have no idea sorry  :confused:
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Offline GrayMK5GTI

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Re: Funny Noise from Under Bonnet
« Reply #4 on: November 20, 2012, 07:02:08 pm »
Could be your tensioners?

My cambelt was replaced recently and makes more noise than before  :grin:
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Offline alackofspeed

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Re: Funny Noise from Under Bonnet
« Reply #5 on: November 20, 2012, 07:17:40 pm »
Frequency follows engine revs? Louder or quieter with engine revs?
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Offline JigBake

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Re: Funny Noise from Under Bonnet
« Reply #6 on: November 20, 2012, 09:15:06 pm »
Aux belt maybe?? Just a guess.
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Offline stealthwolf

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Re: Funny Noise from Under Bonnet
« Reply #7 on: November 20, 2012, 10:30:21 pm »
Mice?
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Offline Nodz

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Re: Funny Noise from Under Bonnet
« Reply #8 on: November 21, 2012, 06:13:30 pm »
Quote from: alackofspeed on November 20, 2012, 07:17:40 pm
Frequency follows engine revs? Louder or quieter with engine revs?

Yeah frequency follows the revs, the noise levels and pitch stays the same just gets drowned out a bit by the engine reving

Quote from: stealthwolf on November 20, 2012, 10:30:21 pm
Mice?

I did think that but it's not random like it would be if it was mice

Quote from: GrayMK5GTI on November 20, 2012, 07:02:08 pm
Could be your tensioners?

My cambelt was replaced recently and makes more noise than before  :grin:

I did think that but the belt and tensioners and water pump was done back in feb last year so I can't see them failing

Quote from: JigBake on November 20, 2012, 09:15:06 pm
Aux belt maybe?? Just a guess.

Could be as I reckon it's a belt or something to do with the belts
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Offline JigBake

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Re: Funny Noise from Under Bonnet
« Reply #9 on: November 21, 2012, 10:48:07 pm »
Well my aux belt is making a similar noise. I sprayed WD40 on the belt to see if the sound went. It dissappeared for a few hours, so when my car is due a service in december the aux belt is being replaced. I cant be having any noises now.
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Offline Nodz

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Re: Funny Noise from Under Bonnet
« Reply #10 on: November 26, 2012, 08:06:53 pm »
Bit of an update, went on a long run the weekend (hours drive, various roads) and the noise has disappeared. Might be due to doing short runs as engine only just getting up to temp but will keep an eye on it.

Quote from: JigBake on November 21, 2012, 10:48:07 pm
Well my aux belt is making a similar noise. I sprayed WD40 on the belt to see if the sound went. It dissappeared for a few hours, so when my car is due a service in december the aux belt is being replaced. I cant be having any noises now.

So it might be that, I'll have that looked into on my next service, thanks
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