okay i know it has to be a valve because my car boggs like it has a bent or burnt valve but i changed all exhaust vavles and it still smokes real bad and knock so i took off the head again checked pistons there fine what would make my car do this **** it is really making me mad its a d15z6....d15b1 w/ z6 head motor ran great for 3 months

 

Its your rod bearing my D16Z6 does the exact same thing. you have to rebuild the motor to fix it properly. a good website for rebuild kits is perfectengine.com It can be fixed by just replacing the rod bearings. It would cause smoke and loss of power.

 

but would it cause it to bogg real bad

 

yeah my honda feels like it has about 50 horsepower and it boggs like its under water