Tapping

AZN MK3

AZN MK3

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I was driving my car the other day and I stopped at a gas station to check under the hood and I noticed that I heard something tapping on the head near the turbo. I was just checking the oil level and coolant when I heard it. Has anyone experienced this on a big single? I have a gt45 on a cast manifold. No signs of exhaust leaks or anything so what could it be? Is this normal when you do a big single swap? Also I have rebuilt the engine, Main Bearings, rod bearings, etc.... Just confused and would like some input on if this is normal or not.. At this point I don't want to drive the car if it is something serious... Thanks guys...
 
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AZN MK3

AZN MK3

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Poodles;1683659 said:
Exhaust leak or a simple valve tick.
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ok I'll check again for exhaust leaks, If its a simple valve tick should I be worried about it? I put an extension on the head to listen it all seems normal on the valve cover.

SupraMario;1683725 said:
Valve tick is my guess, how loud was it?
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It is just as loud as the injectors if that help as a similarity...
 
te72

te72

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Poodles;1683659 said:
Exhaust leak or a simple valve tick.
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Mine does both of these things to a small degree, I don't worry about it much.
 
AZN MK3

AZN MK3

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te72;1683777 said:
Mine does both of these things to a small degree, I don't worry about it much.
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Ok, Thanks. I thought I was going to be something serious. I just can't afford to keep rebuilding and rebuilding. Thanks again.

Poodles;1683816 said:
Depends where the exhaust leak is. EGR cooler leak can melt your wiring harness...
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I've looked at my harness and no signs of it melting. Exhaust leak seems like it's coming from the vband flange of the turbo but it isn't a bad leak just has one small black spot...
 
AZN MK3

AZN MK3

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SupraMario;1684263 said:
So is it a tick tick tick noise? like electrical arcing? Or is it like metal on metal tapping?
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metal tapping metal... I have changed the manifold gasket. Thought it solved it for a while but it came back. On cold start you hear it as soon as you fire it up. after it warms up when you rev and hold it at a certain rpm you'll hear it. It doesn't sound like normal knocking to me or ticking of the injectors but almost similar. Could I be from the grade of oil I'm using? 5w30? I didn't realize on the 2jzgte specs it says that it uses 10w30... So could that be a reason..


EDIT: If I remove the oil cap and rev it up you can really hear it, if that makes sense...
 
AZN MK3

AZN MK3

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IJ.;1685261 said:
Try pulling an injector clip then replacing it one at a time and see if it changes.
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Isn't that to check to see if the injectors are firing? It doesn't tap on idle just when you rev up and hold it and on cold starts.. But I'll check it anyway to see if it changes.
 
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IJ.

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No it's not just to see if the injector is firing....... :nono:

I ask questions for a reason, once you've done it post the results.
(it's called diagnosing an issue instead of playing "guess that noise" may as well guess it's a banana...)
 
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