6nz Jake question

Im chasing a slight noise in valvetrain on my 6nz that’s either a rocker arm or a injector. I can hear it when under throttle and and it goes away instantly when I let off the accelerator. I can also hear it when using the Jake but only on stage 3. Don’t hear it at all on stage 1 or 2. What cylinders are engaged on stage 1, stage 2 and stage 3? Just trying to figure out if noise is coming from cylinders 1 & 2, 3 & 4 or 5 & 6. I’ve googled a good bit and can’t find the answer to this.

 

Not an exhaust leak and air to air is good. I’m about to pull what little hair I have left out chasing this noise. I’m almost certain it’s in the valve train. I’ll look at air to air more tomorrow.

 

I’ve been all over it with a stethoscope for the last couple of weeks. Just havn’t been able to pinpoint anything yet. Was hoping the question I asked about the Jakes would help me narrow it down to one rocker shaft but your answer blew that line of thinking out of the water.

 

I agree that it would make more sense that it was an exhaust leak. If it is I’ve not found it yet and I’ve been all over it looking. What I’m hearing is more of a mechanical sound that comes and goes with the throttle.

 

Not a broken spring. I’ve already checked for that. In the last month I’ve replaced head, cam, 2 injectors and to injector rockers. Cam had started flaking on number five injector lobe and also on the rocker roller. Noise still there after that. Suspected a valve making noise after cam swap and pulled head. Some valves had wear so I went ahead and put a reman head on. Still got the noise. Number 4 injector is a little louder than the rest listening thru a stethoscope. I don’t mind replacing injector but hate to if that’s not my problem. I checked all injector springs while I had them out doing head swap.