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Wtf Is This Weird Noise?

soultz

By soultz,
in General Maintenance

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soultz Community Regular

soultz

Posted
Posted

took my car for a drive tonight after i changed coil packs, my missfire was so close to being fixed just a little tiny missfire, anyway i turned the car off and looked under the bonnet, i could hear a noise which was coming from the coil pack/injector reigion (top of engine) like a crackle???? or a crinch if you will.....it sounded like the injector was clogged or still pulsing even tohugh the car was off???

is this normal? or is this even the problem? i dont know where the noise came from exactly, but it was every 2 seconds and constant....

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SargeRX8 Grand Master

SargeRX8

Posted
Posted

The midget with the milo tin is normal, its just metal components losing heat and cooling down. The other sound is a strange sound, if I had to take a wild guess I'd say some sort of liquid dripping onto something hot and evapourating.

If there was air escaping from a pressurised cylinder, it should be more consistant.

That is a really odd sound, it doesn't sound electrical, mechanical, metallic.

ANT_32 Apprentice

ANT_32

Posted
Posted

I have this sound! Its air bubbles in a coolant hose somewhere. From your turbo or heater probably like mine. Im still not sure what is rooted though ha ha but been driving it for a few weeks and nothing hapened yet. Maybe a slightly rooted Head gasket ? :unsure:

GTR-N1 Grand Master

GTR-N1

Posted
Posted

Use a wooden dowel between 30-60cm long approx > one end in your ear + the other placed on various parts of the block > sound becomes crystal clear when in close proximity.

(Using a long screwdriver is a bit less accurate)

adamskill Mentor

adamskill

Posted
Posted

Use a wooden dowel between 30-60cm long approx > one end in your ear + the other placed on various parts of the block > sound becomes crystal clear when in close proximity.

(Using a long screwdriver is a bit less accurate)

well I'll be damned!

soultz Community Regular

soultz

Posted
  • Author
Posted

ive had the car for half a year now and it only done it the first time the other night, hasnt happened prior or since the other night, it was 1 one off??

i was flogging the car that night, got it to 180Klms, and when i turned it off that sound happened, so could me flogging it have something to do with it??

DVS JEZ Grand Master

DVS JEZ

Posted
Posted

Do not replace the headgasket until some diagnostic tests prove that is an issue.

See if it does it again ever, but otherwise i would say its just the turbo and metal exhaust components cooling down as sarge suggested

Hanaldo Grand Master

Hanaldo

Posted
Posted (edited)

I have this sound! Its air bubbles in a coolant hose somewhere. From your turbo or heater probably like mine. Im still not sure what is rooted though ha ha but been driving it for a few weeks and nothing hapened yet. Maybe a slightly rooted Head gasket ? :unsure:

It doesn't sound like bubbles to me, how did you come to that conclusion?? Genuinely interested, not being a jerk.

Edited by Hanaldo
ANT_32 Apprentice

ANT_32

Posted
Posted (edited)

It doesn't sound like bubbles to me, how did you come to that conclusion?? Genuinely interested, not being a jerk.

Well the on a turbo hose you put your hand on it (with a rag obviously) and you can feel it sort of vibrating as the bubbles are going past.

Also when radiator cap is opened while the noise is happening it will spit and fart at you. However it is almost as though the water is boiling as it does not use any water or over heat.

Been driving it for over 5000km like this now and nothing has happened yet.

Edited by ANT_32
D.I.Y. Mik Veteran

D.I.Y. Mik

Posted
Posted

That sounds like something boiling for sure, theres a restriction which opens at a certain pressure and it builds up then lets go repeatedly.

If thats the case it should gradually slow down as the engine cools.

Ive heard that sound somewhere before, cant remember.

ANT_32 Apprentice

ANT_32

Posted
Posted

Well I'm guessing there is a blockage in the turbo line then. So when the motor is turned off and has no flow the coolant in the turbo boils.

Been studying a bit and found coolant boils at about 240 ish degrees give or take with pressure etc.

Turbos get hotter than that.

So it would be possible especially if you was giving it heaps before turning off I reckon.

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