I used my oil-smoke leak detector on it, and couldn't see any leaking smoke, even with a hot engine. I suspect it's very small, just enough to whistle if discostew is right.
Mysterious Engine Noise (not idlers)
- Thread starter eburrows
- Start date
I used my oil-smoke leak detector on it, and couldn't see any leaking smoke, even with a hot engine. I suspect it's very small, just enough to whistle if discostew is right.
18 week lead time for a long block from AB. I guess I'll be replacing the intake manifolds and testing your theory @discostew
We’ll I would spray water down in there and verify it before I tore the thing apart. When you hit the spot that’s leaking while it’s whistling you’ll know. Right now your just at some crazy guy on the interweb spouting off about spray bottles and water.
I appreciate your advice, but my vacuum leak tester doesn't even get a puff of smoke out, so I don't think I'm going to get much water in there.
Believe me when I say that I don't trust anybody on the internet. But if I try everything I can think of myself, and someone voices an idea that sounds plausible, I'll put that on the list of possibilities.
My personal ideas all involve fatally failing bearing components, so I'm happy to entertain less dramatic possibilities.
Believe me when I say that I don't trust anybody on the internet. But if I try everything I can think of myself, and someone voices an idea that sounds plausible, I'll put that on the list of possibilities.
My personal ideas all involve fatally failing bearing components, so I'm happy to entertain less dramatic possibilities.
You said you could get it to make the noise sometimes. Do that then spray it down while it’s making the noise. It doesn’t surprise me that it doesn’t show up when you smoke it.
Me personally would still be trying to verify. I have a need to know for sure. I told you a good theory and now you should run that down.
Me personally would still be trying to verify. I have a need to know for sure. I told you a good theory and now you should run that down.
It wasn't the intake gaskets. (I replaced them) I guess I'm waiting for it to get more obvious. Too bad.
I guess I would get a cheap mechanics stethoscope and go looking for it while it’s making the noise. Pretty sure they can be had for $20 or less. It will have a metal tube attached to the end that can be removed. You touch that metal tube to components for stuff like bearings and then just the open tube in the general area for air leaks
It's possible this is related to the high-RPM noise, but I found the source of at least some of my rattling, the cat matrix broke off, and vibrated itself into a perfectly shaped plug:
Which caused me to remember: I hate these exhaust studs. Is there a better alternative? Stainless? Titanium? Through-bolt? Every single time I remove the Y-pipe nuts, some bind up and/or shear off.
Which caused me to remember: I hate these exhaust studs. Is there a better alternative? Stainless? Titanium? Through-bolt? Every single time I remove the Y-pipe nuts, some bind up and/or shear off.
That was the source of the high RPM whine too. I could have sworn it was from the other side of the engine, but it's nice to solve two problems with one fix!