Injector #8

[sldghamr]

what is it that i keep hearing about injector #8? what is the best way to fix it?

[ridiculously_necessary]

from what i understand its longer. but i guess the problem is that its at the end of the fuel path and doesnt necessarily get the fuel pressure it needs. i may be wrong though, but if not i would think turning up the fuel pressure might help? hopefully someone else chimes in..

[pjwoolw]

Some trucks have a different injector in the eight hole. IIRC it's an AE? At least for Cali trucks. Something about making the engine run quieter. I'm not sure sort of pulling that injector if there is any way to tell.

[alberta 7.3]

I think only the SD had a "long lead" injector in #8 as "cackle cure."

[elibenson]

If you pull off the left valve cover, you will see that the model # on the top of the injector is different.

I just did injectors on a 2001 model truck, and put in all AD injectors, instead of the AE in the #8 hole. It does seem to cackle a little more when cold, but quiets down when it's warm. I forget why I did that though. Seems that I remember people saying that it was better for the longevity of the #8 injector to use a standard one in that hole. The only down side is the cackle at idle. A high pressure cross-over would probably solve that problem.

[DA BUS]

Originally Posted by sldghamr

what is it that i keep hearing about injector #8? what is the best way to fix it?

I doubt it has to do with any sort of pressure drop. Pascal proved that pressure is equal for a non compressible liquid in an enclosed environment. In other words, across the fuel rail all pressures are equal, no matter which injector you're talking about. Gases are a different story.

Maybe that #8 is another P/N like others are saying?

Hope this helps.