Got a question for you guys here. A few weeks ago I put on the regulated fuel return on my truck, and I was trying to measure if I need to replace the LL#8 or not. I'm really not hearing any sort of injector cackle or anything like that, but I did do a cylinder contribution test today. I've got over 95K miles on my truck:

Cylinders #1-7 showed 0% - 0.7% change in rotational velocity.
Cylinder #8 showed a 2.3% change in rotational velocity.

I know it's normal for #8 to be off a bit thanks to the LL injector. However I was wanting to know at what % should I look at changing out the injector for a standard AD?

 

5% on the CRV and a CCT test will say non contributing. I thought they recommended replacing that LL if you did reg fuel.

 

Not always. I know in the past Bob Riley and a few others have said that if you experience cackle after the regulated return, then you should replace the LL injector. If not, then you should be just fine.

I'm not having a cackle issue, but I'd just like to find out if anyone has any exact measurements of what is or is not recommended for cylinder #8 and it's contribution with the LL injector. If I am too high, then I'll go ahead and swap it out. If not, I plan to keep it for now. I just have the feeling that with my PMS, once the valve covers are off, I won't be able to contain myself with only swapping one injector.

 

I haven't noticed any noticeable difference in mine, and I know for sure I have a LL #8 injector, as verified by my own eyes.

 

Once my AE gets here, I will post what mine comes up with, I have 108K on clock so it might differ.

 

Do you also have a regulated return? I'm curious as to what you find.

 

I don't have a regulated return as of right now. Fuel system is stock as of right now.