Mystery Engine Noise?

**Ski** · 14 June 2005, 10:04

in neautral/1st gear mine rattles like hell above 4k rpm. Its a heatshield i cannot be bothered fixing

**porkkis** · 14 June 2005, 10:05

Could be a bit tired cam chain. Nothing to really worry about in a dizzyless ABY.

Or then a tappet noise.

I'd stay calm.

**dan_b** · 14 June 2005, 10:15

Welcome!

Could be the engine undertray vibrating, or a heatshield wobbling. Also could be a lose exhaust fitting - I've had all three on mine, nothing serious.

Good luck finding an Avant, you've come to the right place for advice!

**PeteRR** · 14 June 2005, 10:23

Mine does exactly the same thing.
If it has a distributor (3B) it sounds like it could be the dizzy gear. Either the gear is worn, there's a bit of end-float in the dizzy shaft or, as porkkis said, the cam chain has a bit of slack that kicks up the gear mesh of the cam and dizzy drive.

If its an ABY then the bet is the cam chain.

Any of which can be fixed relatively easily!

**Jamo** · 14 June 2005, 10:32

Originally posted by JonnyH

Hi All,

I'm currently looking for an S2 estate and I had a look at one last night. I've read everything I can get my hands on, including the s2central.net guide, which is excellent.

I noticed though, that when I was listening to the engine with the bonnet up, and I gently blipped the throttle lever, I could hear a sort of dull rattle kick in at a certain rpm, then disappear as the revs climbed. I couldn't see the rev counter so I can't give an exact figure, but it wasn't much above idle. It only rattled whilst at a particular frequency, maybe about 1200-1300 rpm, I could hold it at the frequency and it would persistently rattle. It was coming from behind the engine block. I presume this is the turbo spooling up, but I'm not sure if this noise is normal or a sign that the bearings are shot. Can anyone give me advice on this?

BTW, excellent forum - it's nice to find a forum where people actually say useful and interesting things rather than posting for the sake of it. Keep it up!

Cheers
Jonny

Ask the seller what type of oil he's using in the engine.

I had something similar when using 10w40 oil and once it was change to 10w60 couldn't hear anything.

**s2avant95M** · 14 June 2005, 10:40

i guess it could be all of the above and more, i have a rattle at 3k-4k, its doing my head in. where abouts is this Avant? maybe its near a forum member, im sure someone would have a look at it if it is.

**JonnyH** · 14 June 2005, 10:47

Cheers everyone - thanks for the advice.

I've attached a picture (original photo courtesy of s2central.net) which shows where my untrained ears traced the rattle to. It's not like a loose heatshield, more mechanical in sound, like a rotating component which vibrates at a certain frequency. Is this where the turbo is located, or is it at the front left? Or is this the camchain - I thought that was at the front....

It's an ABY - if it is a camchain, would it likely be a case of adjusting the tensioner or would I have to get a new chain? (didn't realise it was a chain driven cam - I thought it was a belt)

Attached Files

rattlesource.jpg (59.6 KB, 115 views)

**JonnyH** · 14 June 2005, 11:05

Apologies - just realised I posted this in the wrong section.....

**iain1067** · 14 June 2005, 11:05

additonal rad looks like it's past it's best too, but then i guess you know that already, don't think it has a tensioner, the chain isn't expensive to buy but it's a **** to fit.

**JonnyH** · 14 June 2005, 11:08

Yep the rad looks shot -The photo is actually a stock photo from s2central.net - it's not the car I was looking at.

**s2avant95M** · 14 June 2005, 11:09

Originally posted by iain1067

additonal rad looks like it's past it's best too, but then i guess you know that already, don't think it has a tensioner, the chain isn't expensive to buy but it's a **** to fit.

the photo is from s2central.net not the car he is looking at.

**Jamo** · 14 June 2005, 11:13

Originally posted by JonnyH

Cheers everyone - thanks for the advice.

I've attached a picture (original photo courtesy of s2central.net) which shows where my untrained ears traced the rattle to. It's not like a loose heatshield, more mechanical in sound, like a rotating component which vibrates at a certain frequency. Is this where the turbo is located, or is it at the front left? Or is this the camchain - I thought that was at the front....

It's an ABY - if it is a camchain, would it likely be a case of adjusting the tensioner or would I have to get a new chain? (didn't realise it was a chain driven cam - I thought it was a belt)

The part you've highlighted is the throttle body, the chain is at the opposite end of the engine.

I have no idea why TB would rattle

**Sidspud** · 14 June 2005, 11:18

You're looking at the throttle body, the idle stabalisation valve or any one of numerous hoses and bolts. It is probably just a loose connection or something that needs tightening.
If its coming from under that area then it could be the heat sheilds. Get under the car and see if they're loose.

**Chris M** · 14 June 2005, 11:19

I get a rattle from that area on mine but mine is a 3B so i put it down to the dizzy, even though it had a new dizzy on 6 months before i bought it!! I'm gonna inspect the cams and valve springs when i fit the 7A exhaust cam and do the timing belt again as someone on here had the same problem/rattle and it was a broken valve spring

Cheers,

Chris

Mystery Engine Noise?

Mystery Engine Noise?

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