XJ671

Hows it going guys. I have been a long time lurker on this forum. So my problems is that I recently purchased a 96 classic 4.0HO for $200. The jeep used to run but it has been sitting for over a year. The original culprit was the fuel pump. That has since been replaced along with spark plug + wires, cam sensor (cracked it when removing distributor assembly) and CPS. Still no start so I checked resistance of CPS and it tested good. I have been searching many forums looking for an answer but I am stumped. Any help would be much appreciated.

Parsnip

Did you do a voltage test on the cps?

XJ671

yes both terminals b&c are showing no resistence. However could it be possible that the sensor is a dud? also have a napa sensor did the same test but it could not get the jeep the start up.

other info. consistent crank but no start. no spark. check engine light displayed but no codes being thrown. fuel pump primes and fuel rail is receiving fuel. motor has compression.

NYsNumba1Man

Check out the ASD fuse and relay. Check all fuses for that matter

Radi

It's certainly possible the sensor is bad. There's a video here on testing the CPS:
https://www.cherokeeforum.com/f2/ohm...sensor-143354/

Flip

Test your ignition coil.

XJ671

thanks everyone.

will retest CPS and ASD Relay as well as PCM.

Coil pack was changed along with plugs and wires, forgot to mention that.

XJ671

update.

tried doing cps test as described by the video link but was getting inaccurate readings so i did a ground refresh. then i noticed some wires hanging near the transfer case. turns out they are the o2 wires. will this cause a no start. also found two wires going from the alternator to the green and green/pink wires on the coil connector. anyone know these two wires.

a lot of problems but i pretty much got this thing free and i know it used to run and still has some life

Ian96XJ

I can tell you that my upstream O2 sensor wires were shorting and popping my ASD fuse, causing either a failure to start or sudden death while moving. I changed the O2 sensor (with accompanying wires) and it solved my problem. Does your crank without catching?

rrich

Back to basics - compression, air, fuel, and spark.

Which one(s) is missing?

XJ671

so i checked the wiring mess. cleaned it up. moved ground to correct location and got it to firr up. thanks for all the help. it still runs a little rough but strong.

XJ671

Update:

It was exam week at school so I could not really touch the jeep. but here's what I found when I unraveled the electrical tape that the previous owner put in. From what I have been reading on the forum I can see that what I have is the ND style field connector. however my Jeep has the earlier type alternator. I have been looking at diagrams for both alternator types but I am still new to the whole mechanical aspect of vehicles (especially wiring) so im just looking for a little guidance. Would it be possible to eliminate the field connector box and route wires directly to one another as outlined by the diagrams or would that create more issues?