A little maintenance before att install, couple questions

[Will L.]

Could be air in that line. Try bleeding it a the injector nut.

If it still knocks, swap it with a different injector. That will tell you if its the injector or not. Occasional bad new parts are not unheard of.

 

[Plaf713]

will l ive taken your advice and swapped in one of my old injectors and its still knocking, i cracked the nut to let it bleed as well. Where do i check next? the line kinked? seemed like plenty of fuel was coming out when the line was cracked.

thanks for the help guys

 

[Will L.]

So if you crack the nut at injector #6, does the sound go away?

And sorry I was not very clear- What you need to do is swap #6 new injector with any other injector that you know is not making the sound, say #1 because its easy to reach. The problem with using an old injector is that it might be chattering the seat just like the new injector that is in question. if #1 does not make the sound and you install that injector in #6 hole and the sound is still in #6 the you have eliminated the injector as the culprit.

I have only seen a bad line cause a noise 1 time, but there was visible dent in the line causing an obstruction.
Try using the screwdriver stethoscope (a real mechanics stethoscope works a lot better) to listen at the valve cover and then at the block down close to the oil pan and about 1" below the head at #6. possibilities are lifter, pushrod, rocker arm, rocker arm button, wristpin, or rod bearing. The rod bearing is usually obvious it is down so low in the engine. a wrist pin sounds like a sharp exhaust leak. Any of the others will be heard I the valve cover, and all require removing the cover to chase it.

How outstanding is the noise? Is it 170k miles on this engine?

 

[Plaf713]

It's nothing crazy and not consistent at all. It's funny that before the swap I didn't have any noise at all. Ive done the screwdriver on the injector and at times it sounds great and randomly it will chattered.

 

[Will L.]

In that case, I would put the new injector back in and let it run a month or so then inspect again.

 

[matuva]

Put the #6 at the place of #2: it will be easier for you if you have to pull it again.

My.02

 

[Will L.]

Oh yeah, sorry, #2 easier for you guys- had hummer on the brain.

 

[Paveltolz]

It's nothing crazy and not consistent at all. It's funny that before the swap I didn't have any noise at all. Ive done the screwdriver on the injector and at times it sounds great and randomly it will chattered.

In that case, I would put the new injector back in and let it run a month or so then inspect again.

In hind sight, I recall that I had increased injector noise after swapping in new units...sorry, it took a while to get that to sink in but the 'Chatter' reference vs. Knocking brought that memory to the front. Like Will said, let em run for a month or so (after swapping number #2 and #6 positions) and monitor the noise.
Did you have them pop tested for balance prior to install?

 

[Plaf713]

I did not, I bought Bosch straight from summit racing and installed them

 

[turbovanman]

Put some miles on it, then chase noises.

 

[Plaf713]

Yeah I've put a few miles on it and it seems to be diminishing, now I have to put the new one back in haha