www.wranglerforum.com
what if you just carb it?To run the 89 4.0 with 94 Mopar EFI along with the '94 wiring and PCM, you will need to change the flywheel, distributor assembly, injectors, complete throttle body, PCV and air intake system (YJ), crank position sensor, coolant temp and air temp sensors. MAP sensor is the same.
Best to try to install the later intake and exhaust manifold set, too, but there will be a bit of mismatch on the intake ports, the later ones are higher on the head. The late and early throttle bodies have a different mounting pattern, so an adapter plate would need to be made to use the late throttle body on the old intake manifold. The Renix EGR can be blocked off.
The Renix era short block can be used with the later head. Would make more power to install the later cam if rebuilding it though, it has more lift and duration.
i live in a small town about 80 miles from Moab so safety and smog emissions wont be a problem the only thing I'm concerned about is that how will it run on the trails and other stuff will dust or mud bogging affect it? and how hard is it to buy a later manifolds and run that or should i take the renix injection system into the wranglerSure, if smog is not an issue. Would probably need a stand-alone ignition set, like a DUI distributor, adapted 4.2l Jeep Motorcraft ignition or even and old Delco point distributor from one of the pre '74 AMC sixes. May also require an aftermarket intake manifold. The 4.2l 2 barrel intake may fit the early 4.0 head, but its intake ports are still higher
doesn't the propane in the intake kill some power compared to gasoline?There’s threads out there on making a stand alone renix system. Doesn’t take much to run. It’s a pain to diagnose problems on. Gotta multimeter the suspected bad sensors. I’ve been considering a 4.0 for a future build since I have a bunch of stuff that would work with the 4.0 and it’s power (t176 bellhousing, np435, d44 and 9”), and I’ve come to the conclusion to run propane for my needs. Check out got propane if that makes sense for you.
I’m not quite sure. The 4.0 isn’t a huge powerhouse so I wouldn’t be too worried of a negligible loss. The 22r crowd loves propane so it can’t be too bad.doesn't the propane in the intake kill some power compared to gasoline?
also appreciate the help man
