i have a 2000 xj. and today she won't start. she cranks but won't catch. ran fine yesterday. i have noticed that it has been cranking over longer and longer to start up. all the gauges work to my knowledge so i dont think it is the cps. but i have an extra i may throw on to check. it has a new fuel pump and is getting fuel. going to check the the coil packs and change the plugs. open to any suggestions.

 

its running now. didnt change anything. i left to get parts to check the exhaust back pressure and came back and gave the cat a good whack or two and she fired right up. now new question shouldnt it of thrown a code? has any one else ever had this happen?

 

Check your fuel pressure and look into a new crank sensor. Those can go out suddenly.

 

Your gauges working has nothing to do with your cps working or not. If you say you have an extra one I would change it out or at least keep it in the Jeep just in case it fails.

 

Check for spark. If no spark there is an 85% chance its ur cps.