Problems Turning over and starting in the mornings
So ive got a 2.5L I4 in my 91 yj and since it got cold in the mid-west I've had to pop start it, not only will it not start even after being on the battery charger for 3 hours, but i cant even jump start it, I've checked all the ground and other wires and everything is good, i just replaced the battery about three weeks ago and this new one has 580 cca. it will crank over and start just fine if its above 30-35 degrees, give or take. whats also weird is that once i start it once in the morning it starts up just as it should every time after that until the next morning, I'm completely stuck on this problem, any thoughts or ideas? I'm practically desperate at this point
Mine was turning over but wouldn't fire in the mornings, but then working just fine the rest of the day as you said. It was especially bad below freezing. I was always able to get it to fire, but only after about 10 minutes of trying. I knew I didn't have the issues with the computer that was linked above since I could hear my fuel pump turning on and I could see my check engine light turn on then off. I didn't have any codes and I also tried turning the key on and off to prime the system a few times but that didn't work.
For me, replacing the plugs, wires, cap, rotor, and coil completely solved my problem. I'm back to cranking over 2 or 3 times and it fires, even when it's cold.