Has anyone replaced the original fuel injectors from a late 80's 2.9 with the later ones from a 2001 - 08 3L Ranger (part# 1L5E-C4B)? These are the more modern injector with the 4-hole spray nozzle. They would require rebuilding the FI harness using the EV-6 quick-connectors, but that's probably a good idea too as the ~30 year-old wiring is getting crunchy. Rated output is 13.5pph, which should be "close enough" to the original 14.

 

Those outputs are rated at a specific fuel pressure,
Do the late 80's and the early 2000's run similar fuel pressures?

If the late 80's run at 35 psi to get the 14pph, and the early 2000's run at 50 psi to get 13.5pph,
you'll never get enough fuel with 80's fuel pressure into the newer injectors.

 

I haven't checked but I would guess they run similar fuel pressure. It's a fair point though.

I actually went junkyarding yesterday and came across several V6 Rangers. Every one of them had the 4L engine, which has larger injectors - 19's IIRC.

 

Just to finish this thread up, I've been running the EV6 14 pph injectors from a circa 2003 3L Ranger and they've been working well in the 2.9. Obviously this required rebuilding the FI harness with EV6 connectors - I prefer that approach over the adapters which some have found unreliable.

Oddly, and just to correct my initial post a little, the Mazda B3000 of the same era specs 13.5 pph injectors vs. 14 pph for the Ranger. I'm assuming the fuel pressure is the same since the Ranger and B-Series were essentially the same truck during that era. I tried the 13.5's initially and while the engine ran okay, it felt a little lean. With the 14's installed, it feels right and my A/F gauge correctly shows closed-loop operation once warmed up. I didn't have an A/F gauge installed at the time I had the 13.5's installed, so no data there other than seat-of-the-pants.

FWIW, after removing the 13.5 injectors I installed them in my F150's 4.9 (which specs something like a 12pph injector), and the 4.9 starts easier and runs great with those. Here too, for now that's anecdotal feedback as I don't yet have a A/F gauge installed in the F150.

 

Thanks for the update. I've bookmarked this thread for future reference.