Have you had the head for a while? Did noise get more intense after some hard driving? kind of sounds Like LMA and something else, hard to tell. Any small change in oil pressure gauge would indicate a problem somewhere as something is no longer the same.

 

 

It sounds like a damaged piston to me.
Does it do it full hot?

 

I pulled the plugs and 1 piston was wet a little but other 3 was dry. It doesn't knock if I unplug the spark plug wire from cylinder 3. So slight piston damage? Car runs fine. Maybe something with ignition

 

Car has been having a rough week. Woke up this morning to see a huge ******* dent in quarter panel because someone didn't ******* know how to park. Left no note and anything. Last nite around 11pm I woke up to my alarm pager and thought someone was trying to get in my car so I looked out side and it was clear and this morning I noticed that dent. Now time to repaint the car aswell.

 

Does it do it fully warmed up?
It sounds like piston slap. Can you do a leak down test?

 

It does that at all tempatures. I would think my cat would smoke a lot with piston slap but there's no smoke. Sound is coming out of cylinder 3 and right under the intake manifold side. I would think its detonation. Because when I unplug the wire to that cylinder, the knock disappears. If it was the piston slapping around than it would still make the sound but it doesn't. And it makes that sound when I accelerate lightly. If Im going at 20mph and shift to 5th gear and press the gas medal all the way down and no sound when I do that.

 

My Pistons compression is 11:3:1. I would think is detonating somehow.

 

its not going to pre-ignite at idle. If it's in the bottom end, either the wrist pin is lose in the piston or rod, or the rod bearing is going out.

 

Everything is fine at idle. Knock starts at 2,500rpms and on acceleration. Has to be detonation. What would start causing detonation in cylinder 3?

 

It is not detonation that you hear. It is obvious you do not know how detonation sounds.
You can do a compression test.
But I would open it up and inspect the bottom end for sure before it becomes much more expensive...

 

It's definetly detonation, I'll take the car to a Tunner tomorrow. How do people go about fixing a detonation? New plugs? Maybe the dizzy is going out! Like I said before when I pulled the plugs out I've seen 3 Pistons dry inside and 1 was wet. My plugs were yellow

 

When I drive it sounds like lots of marbles rattling in my motor.

 

What fuel octane do you use?

 

I use 93. It can't be detonation because it's one cylinder. Must be piston slap or bearing. I'll try to pull the pan off today and take a look. Car drives fine and no unusual smoke so I would think its a bearing

 

Using 93 octane with an 11+CR (at the power level your running) is asking for trouble.

 

Than what can it be? I'm about to start pulling the oil pan off

 

Here's a video when I drive
https://*******/wQ0w

 

Tough to hear. You should have taken the video windows up with the camera pointing at the tachometer.

 

I'll do that

 

uhhhh that video sounds like an exhaust leak lol

 

I wish it was. It's metal to metal sound from the block.

 

In person it sounds like a jack hammer

 

drain oil, check for metal in oil

leak down

compression test

do this things and stop driving the car. If your bearing is going to ****, you are going to ruin your crank, turbo, and perhaps oil pump, so I advise you to stop driving it.

 

if it sounds like a jack hammer, its a goddamn rod bearing going out.