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Help with finding Injector upgrade source for 1990 XJ 4.0L I6

9K views 16 replies 8 participants last post by  Jeepin john  
#1 ·
I want to buy a re-manufactured set of six (or 8 giving me two spares) upgraded bosch injectors that still fit the OEM connectors, fuel rail and CLIPS and prefer a good design that will not leak. Many that I find do not seem to have the clip slot in the injector to hold them to the fuel rail.

I believe the original injectors were 18.6 lb/hr rated. I prefer to stay close to the original output specs, but would like to get away from the stock metal/plastic joint the oem injectors have that look like a future gasoline leak.

Would prefer the upgrade 4 hole type injectors.

What p/n do I need to buy from an internet company or from a reliable supplier (link) of re-man parts on ebay?

This seems like it would be an easy problem, but it has not been for me, so any assistance would be sincerely appreciated. The ones that I think will fit say they do not fit the 1990 Cherokee and the ones that say they will fit do not have the slot for the clip to fit in!!!

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Background: Bought this 1990 XJ Cherokee Lmtd 4.0L I6 Renix new in 1990. Has approx 49,000 actual miles. Stock configuration. Been stored for 6 years, but was running fine before storage.

Found Foul smelling gas and rusted out gas tank and rusted out fuel pump. Installed new battery, fuel tank, fuel filter, fuel pump and replaced injector o rings. Started up after this but last two rear cylinders ( #2, #4) were not firing. Removing wire to these two fuel injectors and then spark plugs confirmed that neither cylinder was firing. Moved these two to front two cylinders (#1,#5) and problem followed the injectors. One of them started working in the change after trying to operate them on bench. I suspect some of the rust in the fuel system lines got in the injectors during storage.
 
#6 ·
Thanks JeepJohn92. Since you have a 1988 XJ, you see the plight I have. I did find lots of Dodge Neon Fuel Injectors on e-bay that run a very wide range in flow rates from 20#/hr to 60#/hr. I need the rate of about 20#/hr and prefer 4 hole output streams. The listings leave a lot to be desired if you are unsure which one to buy. They seem to have a slot for the clips, but can't tell if it fits my stock clips. Looks like I can get 8 of them for about $80, which seems fair enough. I just want to get my Jeep back to full running condition without having to spend too much more. I am just absolutely amazed at the choices available for fuel injectors, and how few of them are really a plug and play fit (which I want).
 
#13 ·
Thanks again to all that participated in this thread. I found the search for the best injectors to be confusing and I got two different recommendations from those whose opinions I respect. I probably would have bought the 746 injectors if that recommendation had been made before I purchased the 703's. These run so well, that I certainly do not have buyers remorse over purchasing the 703's.

The jeep is running fine on the 703 injectors. It is on a 1990 Renix Cherokee and does not seem to run rich at all. The injectors came remanufactured with all new parts including new o-rings which did not leak and the clips fit perfectly after turning the injectors 90 degrees so you can see the clip starting in the slots and then turn back with the connector up. This method worked really well.

I would like to tell you the milage is better and the hp is better, but that will take a lot more time. The engine idles smoothly now with the new 4 hole injectors and the power is strong.

After replacing the gas tank, fuel pump, fuel filter, all injectors with 703, and the o-ring in the regulator to fuel rail the jeep is running well again!!!:smile2:
 
#12 · (Edited)
Hi cruiser. I have read your very valuable notes and thanks for the reply.

Since I just spent $180 for 8 reman pieces from the previous recommendation (should be here Monday) of the 0-280-155-703 injectors (from 95-97 Dodge Neon), how much difference will I see vs the 0-280-155-746 injectors?

Stock injectors were 18.6 lb/hr and the 703's show 17.4 lb/hr at 43 psi.

Will they work well enough, or should I send them back?
 
#14 ·
Larger injectors just allow for more fuel to be injected in the same amount of time ,like jetting up a carb, only that the computer will not have to leave it open as long te get the needed fuel. I guess what I am trying to say is bigger injectors are usually a sign of making more power with cam changes and other upgrades.