Nick1994
$100 site donor 2024
After 22 years and 146k+ miles, I thought it might be time to do something about the injectors in my 1996 Jeep Cherokee 4.0L. The common upgrade people do with the 4.0L engine is swapping in mid 90's Dodge Neon fuel injectors for a better spray pattern and better power. Some people also experience better fuel economy too. (They're a 4 hole injector vs the stock 1 hole). Same flow though.
I ordered 4 used injectors and 2 "reman" injectors on eBay and sent them to member Trav on here to work on them and make sure they're perfect, I'm keeping my Jeep forever, so swapping in used injectors and unknown reman injectors is very questionable.
It's a good thing I sent them to him, as the used ones weren't in good shape. They had likely been sitting for a long time and were rusty, one was unable to be serviced. One of the reman injectors was also defective and couldn't be serviced. I ordered up 4 more used ones and he was able to get them dialed in perfect.
Trav sealed up the injectors and labeled which ones are the 6 to use, the 2 good spares, and the 2 junk ones. I also got a data sheet showing the before and after specs of the injectors.
I assume some of my results are from going to 4 hole upgrade injectors, but certainly a lot of it is from Trav servicing them! My Jeep runs fantastic. It ran great before but now, wow!
Power- It isn't really any faster as far as a drag race is concerned, I wasn't wanting that. It's so much more responsive though, the power translates extremely evenly throughout the powerband. It can definitely pass easier without kicking down a gear. Basically, it's got power all over the place.
Noise- I never expected it to be quieter. I'm not one of those guys that can hear the difference with switching to different oils. Never have been able to. But my Jeep is way quieter now, and really smooth.
Fuel Economy- This is still a little inconclusive, because supposedly it takes 50 complete warm ups for the computer to learn new fuel injectors from what I've read. I drove it to work a couple times last week and sat through traffic, let it idle a lot for A/C, and sometimes drove a little wild
and got 13.5 mpg, which is about normal for this kind of driving.
Last night I took it on a trip to Tucson, AZ and back to test the fuel economy, a 200 mile round trip. I kept it at 65 mph and had the A/C on the whole time. 21.3 mpg! I think that's wonderful for a 4x4 6 cylinder with all terrain tires and being shaped like a shoebox going down the highway, especially as it's only rated for 18 mpg on the highway, almost 20% better than the EPA rating.
I just thought I've got to give kudos to Trav, I couldn't imagine just throwing in those used injectors and drive it like that for another 20+ years. The guys on the Cherokee forum do that all the time. They're missing out!
I ordered 4 used injectors and 2 "reman" injectors on eBay and sent them to member Trav on here to work on them and make sure they're perfect, I'm keeping my Jeep forever, so swapping in used injectors and unknown reman injectors is very questionable.
It's a good thing I sent them to him, as the used ones weren't in good shape. They had likely been sitting for a long time and were rusty, one was unable to be serviced. One of the reman injectors was also defective and couldn't be serviced. I ordered up 4 more used ones and he was able to get them dialed in perfect.
Trav sealed up the injectors and labeled which ones are the 6 to use, the 2 good spares, and the 2 junk ones. I also got a data sheet showing the before and after specs of the injectors.
I assume some of my results are from going to 4 hole upgrade injectors, but certainly a lot of it is from Trav servicing them! My Jeep runs fantastic. It ran great before but now, wow!
Power- It isn't really any faster as far as a drag race is concerned, I wasn't wanting that. It's so much more responsive though, the power translates extremely evenly throughout the powerband. It can definitely pass easier without kicking down a gear. Basically, it's got power all over the place.
Noise- I never expected it to be quieter. I'm not one of those guys that can hear the difference with switching to different oils. Never have been able to. But my Jeep is way quieter now, and really smooth.
Fuel Economy- This is still a little inconclusive, because supposedly it takes 50 complete warm ups for the computer to learn new fuel injectors from what I've read. I drove it to work a couple times last week and sat through traffic, let it idle a lot for A/C, and sometimes drove a little wild
Last night I took it on a trip to Tucson, AZ and back to test the fuel economy, a 200 mile round trip. I kept it at 65 mph and had the A/C on the whole time. 21.3 mpg! I think that's wonderful for a 4x4 6 cylinder with all terrain tires and being shaped like a shoebox going down the highway, especially as it's only rated for 18 mpg on the highway, almost 20% better than the EPA rating.
I just thought I've got to give kudos to Trav, I couldn't imagine just throwing in those used injectors and drive it like that for another 20+ years. The guys on the Cherokee forum do that all the time. They're missing out!
