93XJ turning, not firing.
 

93 Cherokee Sport--in line 6, 4.0L--automatic

Recent Engine swap. Nearly, everything is new in the engine chassis, just running into some annoying electrical issues.

The Jeep has started, and ran for a couple of minutes. Shut off, tried again, turns but won't fire. It did have a couple of "rough" starts after that great first start, only with foot flooring the pedal, and now it has drained the battery twice (cranking amps and all that).

What I have done.

Ohms on the CPS is good or a little high, forgive me I had it set so it read 31.2 ohms, but on a different scale it reads 312.

Have read that IAC valve can get stuck, messing up the air fuel mixture. It also has ohms reading, but was dirtier than hell, and am not sure exactly what it does in the throttle body (it was a hot mess, the O ring was also jammed on the lip, so that could of been an issue.

TPS has an ohms reading

Fuel pump does prime. And I have a new filter.

Any other reasons for why it would not get spark?


Thank you Jeep brothers for taking time to read this.

J out of Texas.

Cap rotor coil wires plugs firing order are all the injectors firing? Sounds more like a fuel issue to me. Could be bad gas. There are a bunch of things it could be

Also check the ohms reading on a full sweep of the tps. They can drop out at any point in the resistance wire in the sensor

AIC Valve was and is jammed. Ordered new AIC valve sensor, MAP, TPS, and CPS just to make sure. Will drain gas tank and put in new gas to ensure that gas is not an issue (because prior to this it has run, seems like a bad timing issue from the swap to start with these extra nuances)

Read my TSM of the electrical systems and will conduct a very thorough testing of all parts of the starting system.

Although I hope that is cured by the new AIC valve.