mjeff87 Posted October 22, 2020 Share Posted October 22, 2020 Hey guys, it's been a minute since I last worked on a 4.0L......I got elected to bring a near dead 96 XJ back to life yesterday for a friend. Fixed a TON of little crap (bad plug wires, broken injector clip, broken heater valve, overheating radiator, etc.) and got it purring quite nicely, but there's one vacuum port on the intake manifold that was capped off by a previous owner (XJ came to my buddy via a tow/impound yard, so who knows what it's past was). Among other things, the airbox was booty-fabbed and lots of stuff either isn't there anymore or if it is, it's in the wrong places.....so much fun to try to figure out LOL. I can't figure out what was supposed to be connected to this vac fitting. It runs decent enough now with it capped off, but I'd imagine it would run even better with that vac signal actually doing what it's supposed to. Anyone know what this port feeds? (Not my pic, but the fitting in question I have circled. Interstingly, it looks like it's capped off on this engine as well. Maybe it's capped from the factory? Link to comment Share on other sites More sharing options...
Minuit Posted October 22, 2020 Share Posted October 22, 2020 That goes to the fuel pressure regulator on my 91. I think a '96 had a returnless system, so that'd probably explain it being capped. Link to comment Share on other sites More sharing options...
mjeff87 Posted October 22, 2020 Author Share Posted October 22, 2020 Well, that does make sense, thanks Most of my 4.0 experience is/was on Renix blocks. That engine bay was just a complete rat's nest of crap, and I wasn't quite sure that something should have been hooked to it. Link to comment Share on other sites More sharing options...
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