engine knocking

[luk909]

I got a 2g gst, afew days ago when i was driving home when i noticed that my car started making this weird knocking noise around 2k rpm. it sounds like its coming from cyclinder 1. i changed the plugs but that didnt do nothing
the engine dosent hesitate to start or seem to have lost any power, it drives fine except for this knocking noise at around 2k rpm, it goes away above and below that number. i havent thrown any codes yet.

about a week ago i put in fuel injector cleaner in a full tank of gas, when it got 3/4ths down this is when it started making this weird noise

 

[steve]

If you can hear it knocking then you have a mechanical problem and should park the car until you identify and repair it.