[tommyc]

Pull the valve cover! That sounds like a bad rocker arm or wiped cam. Pretty easy 15 min u can reuse gasket. Look for scoring on the high lift intake cam. Will post a pic later


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[oldmansan]

Sounds like a lawnmower or something. Best of luck.

San

 

[tommyc]

If one of your intake cams looks like this check for broken rocker arm

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[AACstyle]

If one of your intake cams looks like this check for broken rocker arm

Thanks, I will check that!

 

[Nessal]

Haven't watched the video clip but it might be an exhaust leak if you are saying that it is coming from the manifold.

 

[mikelr]

Definitely an exhaust leak.....

A wiped second cam lobe would not effect the idle. A broken rocker would but that is not the source of the noise.

 

[tommyc]

Yeah no that i found a quiet place, aka the pot, it does sound like an exhaust leak at the manifold. Easy to check blow some smoke or vapor around manifold near head. If there is a leak you will see it. Also check bolts on manifold see if they are tight


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[AACstyle]

Yeah no that i found a quiet place, aka the pot, it does sound like an exhaust leak at the manifold. Easy to check blow some smoke or vapor around manifold near head. If there is a leak you will see it. Also check bolts on manifold see if they are tight


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Pulled the valve cover and checked everything out. All the lobes look good

Checked the manifold bolts and sure enough I was able to torque them down a bit. There was still a slight ticking sound but it went away for the most part once the engine came up to temp. The idle settled down after running for a while as well. Took it for a test run and it's running much better. Only thing is if you rev the motor then let go of the gas it wants to kill. Going to burn off some more of this fuel and put fresh gas in. Hopefully this is all, it's looking more promising.

 

[shay2nak]

That motor is not at all stock, so it may sound different than what most of us are used to.
Other than datalogging, I'd suggest doing a smoke test on the exhaust side and taking it to a dyno just to see how it measures. If it's a leak, the smoke will pour out of the source.

 

[bbs350z]

^seafoam!
'

 

[mikelr]

Looking at the video again you can see the exhaust staining on the head from the manifold leaking. There is so much soot I would say this has been a long term reoccurring issue. With all the money the PO threw at this car I am really surprised he did not install a full set of manifold studs on the manifold. I would suggest that you replace the gasket and install studs and Nordlock washers to stop this from happening. I'm sure that leak was playing hell with your closed loop fuel control.
One downside of buying a car with that much aftermarket modification is that when things go wrong (and they usually will) diagnosing issues becomes increasingly more difficult as you don't even have the benefit of a factory ECU with OBDII to point you in any kind of direction. I would suggest that if you are not familiar with the stand alone ecu unit and the software that is running this beast, you get familiar.
Good luck!