Dracos

I've heard in a few places that using a Bosch 0280155703 fuel injector can help a Jeep idle smoother and run stronger. Is this true? I've also found this:

http://www.ebay.com/itm/JEEP-Upgrade...-/330657234572


...is that the correct injector? I read these are "plug and play" and don't require any special modifications to use; just apply o-rings, lube them up and put them in.

I presently drive a 1988 Jeep Cherokee that has the original injectors in it, and even after changing the o-rings some months ago, it has begun to leak gas around one of the injectors where it goes into the engine. The topic I read says that if this happens even with new rings, it's best to replace the injector itself. Also, it says this other injector gives a better spread of gas than the stock one.

Any info would be appreciated.

Dracos

Oh, and this is the link to the place I got the info from.

http://www.jeepforum.com/forum/f13/d...36/index5.html

XJ Mayhem

The "703" injectors are a plug and play upgrade. I finally got around to rebuilding the injectors that I bought a while back and put them in my '98 today. It fires up quicker and has a slightly better throttle response. I haven't been able to check the mpg yet but it's supposed to help a little. These injectors are better because they have four ports instead of the factory single port injector and they atomize the fuel better instead of just pissing the fuel in like the factory ones. There are tons of write-ups and several people selling these injectors on this forum. Unless you really want to rebuild them yourself, I would suggest buying a rebuilt/tested set from someone on here. The set will run you between $65-$70, which is pretty solid compared to the time and money of doing it yourself unless you're a masochist like me. If the photo attached correctly (I'm using my phone) it should show you the difference between the factory and the 703 injection ports. The ugly single port factory injector vs the slightly more attractive four port 703. Hope this helps.

freegdr

Ive been running 703s for about 3 years now ,better throttle response smother idle..As for mileage nothing drastic. but deff worth the 40 dollars and 1 hour of my time.

XJwonders

I know it improved the mileage on my 1999 but I don't know if it will improve the mileage on your 88, but the throttle response def will be noticeable.

salad

88, eh? Read this:

https://www.cherokeeforum.com/f2/1990-renix-volvo-bosch-19-280-155-746-injector-swap-163105/

karl4x4

Good read. I have a wide band o2 sensor and gauge I put on before I stroked my 4L to 4.7 to use as a baseline. A had already converted to 21lbs injector and to my surprise, the 88 remix kept the ratio. Within ideal range without adjustments of the map. Even after stroked to 4.7 and 24 lbs injector, the fuel ratio stayed within the ideal range. Even at WOT. Good little renix

salad

Heh, good story! I'll have to remember this next time I see someone claim you can't install a high flow intake and exhaust without modifying the fuel system

Dracos

Looks like he only got about 1 or 2 mpg more and a slightly cleaner burn for the effort there.

salad

Same effort as swapping in 703s...

karl4x4

I forgot to mention. The 21Lbs upgrade on the 88 (my old ones where leaking) where the ones with 4 small holes vs one bigger hole. They did not improve mileage or performance but a hell of a lot more throttle response under load at idle. Worth every penny (besides they where cheaper) lol

RubberSideUp

No mpg increase for me either. Just smoother idle.

7jeep

I went to a four hole injector in my 2000, no change in mpg but pulls better in 1st an 2nd gear. still falls on its face in 3rd, and no change in 4th or 5th. they were cheaper than new stock injectors. I frequently pull a loaded down 5x9 trailer. everything is still stock for now except the injectors an hood vents.

OttawaXJ

For thread reference who on here sells those 703s rebuilt?

Creature85

I just got a set of 784's from BatmanXJ. He had a few sets of 703's for sell as well.