JDM Journeys
Moderator
I bought my hzj77 three years ago almost to the day. Ever since day one it's had a noise that I haven't been able to *nail* down. (foreshadowing perhaps?)
Its most noticeable in the morning when cold and you accelerate to about 2200rpm. Sometimes I can hear it subtly through the rev range, other times it seems less noticeable once it reaches operating temp but always only under load
It's what I'd describe as a harsh rattle. Hard to pinpoint exactly where beyond "the engine" lol. I've used my stethoscope with no real results. Really noticeable accelerating next to a guard rail. Gear choice doesn't seem to matter. 4wd doesn't change it. Exhaust was checked. No signs of wayward soot anywhere... IP was recond'ed.
I had finally accepted the noise as part of the truck. The 1hz/1hdt crank flex or whatever they call it...
I was listening to it again with the radio off the other day on the way to work when I started thinking back to when I replaced the injectors. I got new seal gaskets with the new injectors, but I don't recall any brass seats. I looked back through pics and no sign of them. And I don't ever remember seeing the seats when I pulled out the old ones... the noise was there before and after the new injectors.
So here's my question after the world's longest, most rambling preamble...
If there were no injector seats, wouldn't that put the injectors closer, and thus cause diesel nailing at certain rpms?
I have them on order so I don't want to pull the injectors twice but I'll be able to confirm soon enough whether there is a seat in there or not. But does my theory sound possible?
Its most noticeable in the morning when cold and you accelerate to about 2200rpm. Sometimes I can hear it subtly through the rev range, other times it seems less noticeable once it reaches operating temp but always only under load
It's what I'd describe as a harsh rattle. Hard to pinpoint exactly where beyond "the engine" lol. I've used my stethoscope with no real results. Really noticeable accelerating next to a guard rail. Gear choice doesn't seem to matter. 4wd doesn't change it. Exhaust was checked. No signs of wayward soot anywhere... IP was recond'ed.
I had finally accepted the noise as part of the truck. The 1hz/1hdt crank flex or whatever they call it...
I was listening to it again with the radio off the other day on the way to work when I started thinking back to when I replaced the injectors. I got new seal gaskets with the new injectors, but I don't recall any brass seats. I looked back through pics and no sign of them. And I don't ever remember seeing the seats when I pulled out the old ones... the noise was there before and after the new injectors.
So here's my question after the world's longest, most rambling preamble...
If there were no injector seats, wouldn't that put the injectors closer, and thus cause diesel nailing at certain rpms?
I have them on order so I don't want to pull the injectors twice but I'll be able to confirm soon enough whether there is a seat in there or not. But does my theory sound possible?
Last edited: