99 Jeep Cherokee 4.0 electrical issues on cold start
Before I start, I just want to say thanks to all the guy who have put so much effort into this forum. Sorry for the wall of text.
My 99 Cherokee is having issues starting when around 40 degrees, I have replaced the coolant temp sensor, the battery and cables/terminals, and continue to get cold start issues. It turns over just fine, but wont start. It starts every time if its even slightly warmed up.
The tachometer and speedometer are currently working fine, once in a while it will start without them working and then kick in. That is very rare.
The alternator is putting out 14v according to the gauge, and is charging the battery just fine, but it is an older alternator with a lower amperage. When the original went out, the parts stores had two to choose from, one that was the same amperage and would not fit, and one that was smaller, had a wire harness from the previous model, and so I was forced to splice the wires to get it to work. The live wire to the battery/fuse box appears to be in good condition, but I have not cleaned the wire where it bolts to the alternator. Even with it running 14v, could this be it? Ill try it regardless.
The two smaller wires are spliced, as I stated before, how would dirty connections act? Like I already said, its putting out 14v and charging. Those are only feedback loops, correct? The needle does fluctuate ever so slightly, barely noticeable.
It was throwing a P1694 and P1698, but after a reset it is only showing a P1698 anymore. I replaced fuse #16 and the fuse directly left of it in the PDC next to the battery just before, but neither seemed to be blown. This was to make sure it wasnt the #16 fuse causing the two codes.
A week ago I may have had a short, or it could have just been a really effed up battery, the lights would be on and I would read only 10v, and when I turned the key it would die so completely that the lights could barely be seen. Just instantly suck all the rest of the life out. Happened once more when I was getting a jump.
I am also having an issue with the blinker not working constantly in either direction, and the four way seems to be completely broken. Just saying in case there is some bizarre connection between the two.
I found that the upper O2 sensor wire was pinched between a bolt and the oil pan, but the outer casing seems to be fine. I have read that an O2 sensor problem can kill communication between the ecm and tcm, so just putting it out there.
I have a CPS waiting to be installed, but I could not get the top bolt removed, so I decided to come on here and get some advice after I ran out of time and sunlight. Would a CPS cause a cold start issue?
If it doesnt want to start tommorow morning, Im going to switch the fuel and O2 sensor relays with the AC clutch relay. Can a bad relay stop the 5v line just like a shorted wire would?
Thanks again guys!