Application is a '97 Jeep Cherokee 4.0L straight-six
I installed EV6 fuel injectors to replace the outdated EV1 injectors. The new ones are slightly higher flowing I think.
- old: 23.2 lb/hr @ 49 psi
- new: 22.7 lb/hr @ 43 psi (but they're being operated at my Jeep's 49 psi fuel pressure)
Watching my Long Term Fuel Trim levels on an obdII scan tool, they can get as low as -12% or -13% after accelerating, and they're around -8% or -9% while idling, and they can get just above 0% if accelerating hard.
Assuming everything is functioning perfectly fine with my Jeep, is it ok for the LTFT levels to be less than -10%? Like, could that be harmful on the injectors or will it cause the check engine light to come on?