What this video and tell me if what you hear is rod knock.

Rod Knock

Sure sounds like it. You should take another video, but this time rev the engine up, and maintain that RPM.

/ubbthreads/images/graemlins/banghead.gif OK I'll try to do that tomorrow.

It was kind of hard to get the engine to continue making that noise, it seems to mainly happen when you initially give it throttle, then it stops. We can try and get some audio of the car driving down the road under load or something.

ouch my car sounded just like that but i hast cranks walk and a crack in a piston skirt

I'm f-ing pissed the engine has only 30K miles on it and it saw zero abuse. I realize that really doesn't have anything to do with it but its the point.

Does it change when it gets warmer? I could be a bad wrist pin.

Not really, it makes that noise when it's either hot or cold.

Yeah then its rod knock.

Tore in to the car tonight. Rod bearings looking fine. The main bearings are another story. I'll know more tomorrow.

Neither the rod nor main bearings are bad enough to cause rod knock. Wrist Pins maybe? I don't know where to go from here.

Uhg. I hate diagnosing stuff from audio. I remember when my buddy's 2g had rod knock, and it sounded exactly like a collapsed lifter.

I just tore into my motor last night to find that the rear balance shaft is the culprit for my rod knock. Im not sure if you already eliminated it tho. Time for BSE!

Loose flywheel bolts?

Nope they were tight. And my engine doesn't have balance shafts.

Pulled the head tonight, cylinders still have hatch marks, so I'm happy about that. The pistons have some carbon build up on them along with the exhaust valves. Is there a safe way to remove that build up off the valves?

One thing I noticed is that on the inside of the intake manifold runners there is this gritty sand sh*t that I can rub off with my fingers. But its not sand, I don't know what it is.

I'm pulling the pistons tomorrow I'm leaning towards a wrist pin.

Did you notice anything wrong with the valvetrain when you took the head off?

What color is that gritty sh*t?

The gritty stuff is a black and tan color. I'm pretty sure it carbon build up that has come off the inside of the intake.

The only thing I noticed about the valve train is large carbon build up on exhaust valves.

I pulled the pistons and rods today, number four piston has a cracked skirt. /ubbthreads/images/graemlins/banghead.gif

So time for a new engine. /ubbthreads/images/graemlins/mad.gif

Sorry to hear that /ubbthreads/images/graemlins/frown.gif