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Oh yeah, check the connectors on the injectors in your jeep, there are 2 types of connectors. You want to make sure you get the correct ones, or you will need to wire in different connectors.

Yep. I would make sure to have new o-rings. To make it easier, I usually oil the o-rings prior to installation. Also, when pressing the new injectors into the fuel rail, be very careful not to cut the o-rings. To do it carefully, you will need to roll the injector, with the new o-ring, in a...

I suggest you remove the hose from the booster to the intake, and plug the intake with your thumb. The idle should go back to normal, indicating that the booster is leaking. I had an 88 cherokee, and it was audibly leaking. When I replaced it, the engine ran better, and things generally...

I found another article in which there were directions to "burp" the engine. In a closed system, it depends on the pressure to flow properly. If there is air trapped in the engine, that will stop it from flowing properly. The suggestion was to jack up the back of the Jeep, to raise the back...

Also you might consider the Ford Racing / Bosch Design III injectors. These are an excellent replacement for the stock injectors in the 87-90 Renix 4.0L. They feature the 4 hole design, along with a disc type pintle, making them faster, and more accurate. For the 91-95 4.0L, there is a set of...

Is the 258 distributor the same as the distributor for the 4.0L? Besides the Coil, what makes this better?

I also have a 1990 4.0L. I added the 7120 casting HO head from 91-95 models. I ported and polished it according to an article I found by Dino Savva. I have also added the newer intake manifold. I had to create a kit to adapt the Renix TPS to the newer style throttle body. Now I am waiting...