I just fixed a ton of things on my D16Z6 honda EG. Head gasket head milled down ajusted the valves used alternator ECU and fuel injectors! I got everything back together today and when and started it up, sounds good. Took it out for a test drive to make sure it's all good for when I get it inspected this Monday! I started to give it gas and all I can hear is a thudding noise over and over. Pretty sure it's not the valves because valves make a ticking noise. Car seemed to lack a little power on the top end, Vtec kicked in 300 rpms late and then hesitated at 6300 rpms. Didn't over heat! IDK what is causing the noise?? Could the timing belt be off by one or more teeth?? Engine runs fine at idle just when i give it gas the noise starts!
Thank you for any help
Don

 

could my belt tensioner be causing this??

 

don't know man, but doesn't sound good. I might be able to help you if you give some more info on where the noise is coming from. i.e., top end, bottom end, front or rear of engine. If its more of a thud, sounds like rod bearings to me but can't tell with the little info and not being there in person, know what I mean?
later,
robert

 

during all this I broke the bolt holding the cam gear on so I took out the motor mounts on driver side on car and jacked the motor up a little. Then I drilled and removed the bad bolt and replaced it. Could I have damaged my rod bearing by doing so??