How to check if there is spark on 94 jeep cherokee

may be a poor contact.
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MD802

I would check the computer for trouble codes and the fuel pressure with a gauge. When it won't start you will need to find out if it is fuel or ignition related to proceed.

Check ur engine

It could be the security system or maybe a crank sensor.

First thing I'd check is each and every wire where the alarm had been attached. if it was aftermarket, there will be tape on the ignition harness. remove tape and check that each wire still is connected, then re-tape. If it was a factory alarm, it would be good to find out what exactly was done by the person that removed it. What was eliminated, jumped etc.
Otherwise go over entire ignition and fuel system using standard tests outlined in manuals. It may be a "normal failure" that can be diagnosed.

i would suggest checking to see if you are getting fuel by disconnecting the fuel line at the fuel rail and turn key if no fuel then its either fuel pump or fuel filter. if you get fuel then it would be the spark

If you have a security system, close all the doors and then lock the drivers door with the key, then unlock it. That should re-set the system. I've had the computer completely disconnected from mine several times (used it to check another vehicle) and I don't have security...it started and ran fine...only difference between the two is the security so I'd try that.

The crankshaft position sensor was seriously problematic in those old jeeps. It's located towards the top of the bell housing slightly to the driver's side I think.

The most common cause is usually the crank sensor, but at this point I would not jump to conclusions without testing it as well as all electrical connections pertaining to the ignition system etc anyone can fix a problem by just changing everything but thats not the best way to go!

Hi, I had simmilar problem with my 1993 JGC . I ran out of gas and it would not start until the next day. Then it will start and run until I put the brakes on tho stop and then it will die. It starts right back up. Ended up being the voltage regulator in the ECC/ECM. It is at the mechanics shop right now waiting for the ECC to come in.I will post a follow up.
have Fun,
David C