89 jeep cherokee
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Joined: Apr 2014
Posts: 1
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From: florida
Year: 1989
Model: Cherokee
Engine: 4.0
Getting ready to swap one hole injectors, to four hole, should I change the fuel setting higher or leave it alone 14-15 psi.
thank you,
serge
thank you,
serge
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Joined: Aug 2011
Posts: 43,971
Likes: 1,579
From: Prescott, Az
Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
First off, the fuel pressure on an 89 4.0 is 31 at idle with the vacuum hose connected to the regulator and 39 with the hose disconnected. It's not adjustable. Put the injectors in and don't look back.
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