PLEASE HELP! I'M AT THE EDGE OF SCRAPPING THIS THING! Don't really want to though, would like to build in a couple years. I have a 90 cherokee 4.0 Renix, my problem is no spark, no fuel pressure, reverse lights, or gauges. I tested the cps, 232 ohms, .6 volts-don't think it's that. Tried unplugging sensors one at a time and still nothing. Every connection was clean and had dielectric. Checked and cleaned all grounds and they look good. Would the coil cause these problems (looks original)? Should I pull it and get bench tested? I lost my book and am desperate for info. This is my daily driver so ANY help is VERY APPRECIATED. It cranks but won't start.It's like he took over.

 

Does your fuel pump run momentarily when you turn the key? How about if you jumper the ballast resistor on the firewall?

 

All are likely unrelated. Your reverse lights are probably not working because of your NSS... any other NSS symptoms? Shifter wiggle to start? Have to start in neutral? Check trans fuse and "TURN B/U" fuse.

Pull your ignition module (under coil) and make sure contacts are clean. Have coil tested.

There's a list of things can cause the gauges to fail but it's usually a harness coming loose on the back or a fuse.

How do you know you have no spark or fuel pressure? You didn't mention any testing.

 

I used an in-line spark tester to check for spark, checked fuel pressure by removing cap on fuel rail and was able to push in valve and nothing = 0 pressure. I pulled the coil and cleaned the pins and contact points. I'm going to replace start relay/switch. My main concern is the no spark. Hopefully that's it. Thank you for helping.

 

After quite a few hours of testing and re-doing and re-testing, due to the fact the fancy Renix doesn't store fault codes for 1990, just engine management stuff, concluded it was the computer, got one thru O'Reilly, re-man. o. e., about a buck and some change, there is a core charge, next day was there, plugged it in and all is good. There is no check engine light:-(