Ok, so my 99 xj starts and runs great when its warm. If I leave it outside overnight it just cranks. Sometimes if I cycle the key 5-10 times it would start so I thought it was a fuel pressure issue. Sounded to me like the fuel pump wasn't holding the pressure so I changed it. Didn't change..... So the next time it acted up I checked for spark at the spark plugs and there was nothing there. Ok, so it could be the coil or the CPS. Wigled the CPS wiring and it started. Sounds easy enough, replaced it and left it outside overnight....still didn't start in the morning. I checked for spark again, still nothing. This time I checked for spark off the coil and nothing. I checked to see if the coil is getting power and its getting 6.2v when the key is in the running position. So I replaced the coil. Still didn't start and no spark. I pushed it back into my garage and gave it 2 hours and it started right up.....AHHHHHHHH!

 

Hmmmm interesting... Have you had your battery Load tested. It may stay charged at 12 volts but you could be losing the CCA (Cold Cranking Amps). Just a thought. Otherwise I would have said CPS lol. Good luck.

 

The battery hasn't been load tested. That battery will crank that starter over forever if I wanted it to. There should still be some spark but thanx.

 

This may sound weird but it happened to us a few weeks ago, my truck was doing the same thing, what seemed to fix it was changing the air filter, the dirt was crystallizing in it and it wasn't letting enough air pass through it. Sounds weird but it worked for me.

 

It's not getting spark.....

 

Can anyone please HELP ME!!!!

 

are your battery cables and terminals clean ? and look shiney...

 

sound like it has some thing to do with temp no out side it wont start but in the garage it will have you checked it for codes

 

Yes, the battery connections are great.

 

If you are only getting 6.2 volts then wiggle the wires and it starts I would suspect a bad or broken connection somewhere along the line but not at the battery terminals. If you have enough current to crank it you should have more than enough for the ignition circuit. Follow the wires back and find the broken/wet/corroded wire and you will solve the problem.

 

I thought the coil only needed 5volts to work. With it warm in my garage I will check the voltage there again.

 

if some thing is not reciveing the proper current the computer should store a code even if the check engine light is not on checking for codes can assist in aiming you in the right direction

 

Had the same problem. Mine was the computer. Try pooring hot water on the computer. That worked for me.

 

Scanned it, no codes found. Checked voltage at the coil in my garage with key at run position and its at 5-6 volts, also checked it while cranking and its closer to 10 volts then. I am thiniking computer problem, I am going to remove the computer and put it outside to freeze, then plug it back in and try it again.

 

If it is the computer I would be curious to know why wiggling the wires made it start.. That screams bad wiring to me.