Injector Swap Writeup for the 4.0L - Page 8 - JeepForum.com
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Go Back JeepForum.com > Models > Jeep Cherokee & Comanche Forums > XJ Cherokee Technical Forum > Injector Swap Writeup for the 4.0L

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Unread 04-17-2013, 09:48 AM   #106
misfit77
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I used motor oil...no issues yet.

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Unread 04-20-2013, 02:07 PM   #107
DunmerBoy
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I went down from 17 mpg to 14. Haha needless to say I did the reset thing
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Unread 04-21-2013, 09:47 PM   #108
billybooster2
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Whilenot quite on topic, my jeep is a brick on wheels

image-619954630.jpg

I have 258 block, 4.0 head, yj fuel injection, the 4 hole neon injectors, and a cheap eBay header. I get 20mpg on freeway, average 16-17 on short runs. Thats gps mileage, not bogus speedo stuff!
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Unread 04-24-2013, 09:59 PM   #109
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great info, cant wait to do this to my 4.0
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Unread 04-28-2013, 02:12 PM   #110
elcapitano
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injector swap, no start.

I just finished doing the injector swap. everything is connected, no leaks. but its not starting. engine is turning over, but either no fuel??? or no fire?? not sure. i checked the pressure valve on the fuel rail and fuel came out. any help would be appreciated, this is my daily driver and have work in the morning :-P


Thanks again in advance.

Sorry, its a 88. used the neon 703 injectors
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Unread 04-28-2013, 02:18 PM   #111
billybooster2
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Turn on and off with key to cycle pump.
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Unread 04-28-2013, 02:21 PM   #112
elcapitano
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Quote:
Originally Posted by billybooster2 View Post
Turn on and off with key to cycle pump.
i have attempted at least 4 starts. should i try more? or just cycle with out trying to start?


update: just cycled to run 4 times and it started on the 5th. now to let the memory re-learn again. Thank you billy.

Last edited by elcapitano; 04-28-2013 at 02:31 PM..
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Unread 04-28-2013, 02:38 PM   #113
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Cycle without
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Unread 04-28-2013, 10:40 PM   #114
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Make sure all the sensors to the throttle body are connected too
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Unread 05-08-2013, 05:30 PM   #115
Jeepuzzled
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I have a 1989 Jeep Comanche 4.0L that looks different than your engine pictures. I have Googled replacing the injectors on my model Jeep, but only came up with your tutorial for a 1996 Jeep Cherokee. My fuel rail connections are different than yours, and the injectors seem to be using some sort of clip attachment. Could you please direct me to a modified writeup for my vehicle model?
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Unread 05-08-2013, 06:15 PM   #116
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Post a picture of it here then we will be able to answer your question...
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Unread 05-08-2013, 06:18 PM   #117
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Quote:
Originally Posted by Jeepuzzled View Post
I have a 1989 Jeep Comanche 4.0L that looks different than your engine pictures. I have Googled replacing the injectors on my model Jeep, but only came up with your tutorial for a 1995 Jeep Sport 4.0L. My fuel rail connections are different than yours, and the injectors seem to be using some sort of clip attachment. Could you please direct me to a modified writeup for my vehicle model?
I have attached images of my engine.
89fi1.jpg   89fuelpressurereg.jpg   89fuelrail1.jpg   89fuelrail2.jpg   89rearfuelconnection.jpg  

89throtlelinkage.jpg  
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Unread 05-08-2013, 06:20 PM   #118
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Quote:
Originally Posted by nysm1 View Post
Post a picture of it here then we will be able to answer your question...
OK, it's done. If you need additional pics, I can load those as well.
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Unread 05-08-2013, 06:25 PM   #119
billybooster2
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IF YOU HAVE THE RENIX engine, I believe 89-91, then you can use Lincoln Towncar 90's injectors. The Renix engine uses 19lb/hr 39 psi injectors. The 1990-91 4.6L injectors which are also 19lb an hour but 36 psi and they are 4 hole injectors. OEM part number was 0280150943. Also fit Mustangs from later years. Known as the 710 as well. Some say you need to upgrade your regulator on the rail but that's probably not necessary on a stock engine.

SO, disconnect battery, and then anything electrical near the fuel rail. Relieve pressure at fuel rail with rag and pointy object! detach fuel rail and remove and swap injectors. Go backwards to re-install and cycle key to prime rail and check for leaks at rail and injectors before you turn the engine over.


I believe this is what you want
http://www.rockauto.com/catalog/more...471&cc=1188761

OR this

http://www.rockauto.com/catalog/raframecatalog.php?ck[year_1993]=true&ck[mkt_US]=true&ck[mkt_EU]=true&ck[mkt_CA]=true&ck[mkt_MX]=true&ck[ID]=0&ck[idlist]=0&ck[viewcurrency]=USD&ck[PHP_SESSION_ID]=1gslhpo7vlb6pumrp17ppufq30


There are 3 hole, 4 hole and 6 hole variants.... do they look right to you?
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Unread 05-08-2013, 06:32 PM   #120
Jeepuzzled
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Quote:
Originally Posted by billybooster2 View Post
IF YOU HAVE THE RENIX engine, I believe 89-91, then you can use Lincoln Towncar 90's injectors. The Renix engine uses 19lb/hr 39 psi injectors. The 1990-91 4.6L injectors which are also 19lb an hour but 36 psi and they are 4 hole injectors. OEM part number was 0280150943. Also fit Mustangs from later years. Known as the 710 as well. Some say you need to upgrade your regulator on the rail but that's probably not necessary on a stock engine.

SO, disconnect battery, and then anything electrical near the fuel rail. Relieve pressure at fuel rail with rag and pointy object! detach fuel rail and remove and swap injectors. Go backwards to re-install and cycle key to prime rail and check for leaks at rail and injectors before you turn the engine over.


I believe this is what you want
http://www.rockauto.com/catalog/more...471&cc=1188761

OR this

http://www.rockauto.com/catalog/raframecatalog.php?ck[year_1993]=true&ck[mkt_US]=true&ck[mkt_EU]=true&ck[mkt_CA]=true&ck[mkt_MX]=true&ck[ID]=0&ck[idlist]=0&ck[viewcurrency]=USD&ck[PHP_SESSION_ID]=1gslhpo7vlb6pumrp17ppufq30


There are 3 hole, 4 hole and 6 hole variants.... do they look right to you?
Thanks. I already have purchased rebuilt 4 hole injectors. Where I am stumped is the process for removing the fuel lines and injectors from the rail. The process explained for the 1995 Sport is different than my engine that has different fuel lines , and a pressure regulator at the end of the rail. I was hoping someone could walk me through a modified detailed tutorial for my '89 Comanche where it differs from the '95 Sport described in detail here. Do I need to remove the regulator from the rail, and if I have to, do I need to replace it or any or the parts associated with it ( O rings, etc.) while replacing the injectors?
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