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Can you help identify this noise??

Carlo

By Carlo
in 986 Series (Boxster, Boxster S)

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  • 2 weeks later...
hpjay Member

hpjay

Posted
Posted
Engine_Noise.WAV

Hi all, sorry I have to introduce myself with this kind of thread but I am stuck with this one.  Reversed into a car and engine now makes this noise.

Can you identify it.  Any ideas welcome.

Sounds like an exhaust manifold leak. You may have bent one of the exhaust manifolds enough to allow a leak at the cylinder head.

Should be easy to identify after lifting the car and looking closely at each cylinder/manifold joint with the engine running and it is cold. This way you can feel around the joints for the gas pressure. Besure to use jack stands!

Henry Jay

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secretaznman4u Member

secretaznman4u

Posted
Posted
Engine_Noise.WAV

Hi all, sorry I have to introduce myself with this kind of thread but I am stuck with this one.  Reversed into a car and engine now makes this noise.

Can you identify it.  Any ideas welcome.

Sounds like an exhaust manifold leak. You may have bent one of the exhaust manifolds enough to allow a leak at the cylinder head.

Should be easy to identify after lifting the car and looking closely at each cylinder/manifold joint with the engine running and it is cold. This way you can feel around the joints for the gas pressure. Besure to use jack stands!

Henry Jay

you notice, the sounds disapates once the the engine has ran for a bit. sounds more live valve lashing to me. On BMW's this sounds happens when you are low on oil. I would start by checking the obvious, such as the oil level.

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mackgoo Member

mackgoo

Posted
Posted

These guys are being far too kind. It sound like a rod knocking to me. I hope it's one of these more benign diagnosis. As was said check the simple stuff first.

The old cars used to pull head studs and you might get a noise like that. I don't think that is applicable here. In fact I'm sure of it, you'd have a coolant leak if that was the case.

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  • 3 months later...
  • 3 weeks later...
Ponch Member

Ponch

Posted
Posted (edited)

Turns out is was caused by sticky valves. Stead Porsche gave me an additive that solved the problem....though if it comes back, it could mean their replacement.

Edited by KRIEGLERR
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