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Unread 10-20-2010, 08:22 PM   #1
evilbill
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Join Date: Nov 2009
Location: Oregon
Posts: 3
89 injector swap

Hi everyone. I've done the search thing but I haven't seen a definate answer for my question. If you swap to the yellow top 4 hole injectors, do you or don't you have to use the later fuel rail with the higher fuel pressure regulator? some people have said no, and some have said yes. Inquiring minds want to know,
Thanks, Bill

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Unread 10-21-2010, 01:20 AM   #2
rawk hard xj
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1989 XJ Cherokee 
 
Join Date: Oct 2007
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I swapped in the 4-hole injectors on my '89 and kept everything else stock. Runs way better than it did before or than my other '89 ever did. But I've only been running for about 1,000 miles(Sarcasm). You may get more change using a H.O. intake due to its volume, but you could probably do the same thing with a throttle body spacer.
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Unread 10-21-2010, 06:46 AM   #3
cruiser54
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1990 MJ Comanche 
 
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Quote:
Originally Posted by rawk hard xj View Post
I swapped in the 4-hole injectors on my '89 and kept everything else stock. Runs way better than it did before or than my other '89 ever did. But I've only been running for about 1,000 miles(Sarcasm). You may get more change using a H.O. intake due to its volume, but you could probably do the same thing with a throttle body spacer.
Done 2 of my Renix Jeeps without changing the rail and about to do my third in the near future. The yellow tops give most benefit for two reasons:

They have the 4 discs which provide a better spray pattern.

They replace the POS Siemens-Deka injectors which came stock that were prone to leaking fuel from a seam and starting Car-B-Ques.
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