Loud Knocking Noise

[suprapower]

So i have ths really loud knocking noise on my civic. i dont get a CEL. it's really loud like when you first sart it and then it almost compltetly dies down after engine is warm/ tryied to run it in driveway but knocking got worse and have a lot of loss in power. So yeah, I'm lost. Help a brotha out

[twinj]

Don't drive the car anymore. The Engine is bad.

[suprapower]

well thats not very helpful. im thinkin its a ****ed up wrist pin.

[twinj]

well thats not very helpful. im thinkin its a ****ed up wrist pin.

How is it not helpful? The engine is bad reguardless ,and has to be torn apart.

[AirMax95]

well thats not very helpful. im thinkin its a ****ed up wrist pin.

Don't listen to that guy, drive that muthasucka. It's just a little stopped up thats all :crazy: Just rev it to about 7k rpm numerous times. It will fix itself :D

[The BUCKY]

rod knock = death

[carbon_crash]

So i have ths really loud knocking noise on my civic. i dont get a CEL. it's really loud like when you first sart it and then it almost compltetly dies down after engine is warm/ tryied to run it in driveway but knocking got worse and have a lot of loss in power. So yeah, I'm lost. Help a brotha out

If the knocking gets louder upon acceleration, then u got rod knock and probably a damaged crank. Sucks man, I am in the same boat! Spun bearings FTL!!

[Atlblkz06]

Detonation, or Piston slap, or rod knock IMO.

Piston Slap:
Excessive piston slap occurs when the clearance between the piston and the cylinder bore is too great. The piston to cylinder bore clearance becomes too great either through wear, mismatched pistons and cylinder bores at manufacturing or, a combination of both. The audible noise associated with excessive piston slap is due to the perpendicular impact of the piston against the wall of the cylinder bore. Audible piston slap is typically loudest when the engine is first started up. The pistons then expand with heat reducing the piston to cylinder bore clearance thus, reducing the perpendicular impact of the piston against the cylinder wall and its resulting noise.


Rod Knock
Rod knock isn't always apparent at idle due to the oil films ability to cushion the crank/rod. Rod knock will get worse/louder with rpm and isn't dependent on load at all so you can hear it while sitting still.

Detonation:
Detonation or spark knock is a bit more difficult to detect and occasionally can't be heard at all. At best it will have the effect of making the engine sound similar to a diesel or it can best be described like a handful of marbles rattling in a coffee can. Detonation in street vehicles will generally present itself in low rpm/low vacuum/high load/high temperature situations.

Sounds like classic rod knock. The oil isnt cushioning when cold since its thicker and the noise is probably horrible at startup.

[suprapower]

yeah it gets louder upon so you could be right. i guess its time to tear this thing up and find out for sure. thanks man

[suprapower]

it is haneous at startup