fuel injectors

[JACKED88]

Can anybody tell me what the difference is in 1988 4.0 injectors and 1996 4.0 injectors??? I'm thinkin there's a slight difference in flow rates. If so, how much???

 

I have an injector on my 88 4.0 thats leaking. I have a full set of injectors out of a 1996 ZJ sittin in tha tool box. What would be tha "pros" or "cons" in putting those 96 ZJ injectors in my 88 MJ?

 

Pending the answer from above, I was thinkin about taking an injector out of my 89 XJ to replace tha one thats leaking in my 88 MJ. Then temporarily replace tha one I took out of the XJ with one of the ZJ's so the XJ will still run good enough to be moved as needed.

[cracker]

http://www.greatlakesxj.com/tech/injectors.html

[JACKED88]

http://www.greatlakesxj.com/tech/injectors.html

Thanks for the info. It answered my question. NO!!! The 96 injectors won't work in my 88. :(

 

Reckon I better git back top work since I now have two injector rails to R&R. I've already pulled all the injectors out of my truck once thinking I had an o-ring leak. Replaced all of the o-rings only to find out it's the injector itself thats leaking. :wall:

 

Thanks again.

[Comanche County]

Thanks for posting that tech site.

[JACKED88]

Those 96 ZJ injectors aughta work just fine after all.

 

"The injector flow rate varies as the square root of the pressure drop across the injector. The stock '91-'95 4.0 injectors are rated at 22lb/hr @ 43psi fuel pressure, so at 39psi they flow ( sq. rt.(39/43) x 22.0 = 21.0 )."

 

In my case, I have 10 lbs less fuel pressure than what they say a 96 is supposed to have. (1996-1999 / 49psi / 23.2lb/hr) (1987-1990 / 39psi / 18.6lb/hr)

 

So based on the formula above; If 4lbs less fuel pressure only gives you a 1lb/hr loss of flow, then a 10lb loss in pressure should only give you a 2.5lb/hr loss of flow. By that formula based on having 39lb of fuel pressure those 23.2lb/hr injectors should give me a 20.8 lb/hr flow rate. Thats an increase of only 2.2lb/hr of flow rate over the stock 18.6lb/hr rate. No problem. It aughta run fine. Perhaps a little better.

 

.

[gl1200aman]

Too much thinking in that post. I think i'm getting a headache from reading all the thinking he typed.

[JACKED88]

Too much thinking in that post. I think i'm getting a headache from reading all the thinking he typed.

YOU??? What about me??? I havent had a headache like this since I was trying to figure out what frickin tires to buy. :wall: LOL!!!

[gradon]

I've been running the gray tops from my 96 XJ(now using lt1s) in my 88 eliminator the whole summer and they work just fine.

[JACKED88]

I've been running the gray tops from my 96 XJ(now using lt1s) in my 88 eliminator the whole summer and they work just fine.

Yep, thats them. Drove about 50 miles on um today with no problems. :thumbsup: