Yesterday morning I started my 95 XJ with the automatic started it ran for about 5 minute and then stalled out. I tryed to start with the key but it wouldn't turnover. The weird thing is I got two code off the check engine light, code 12 ( battery or computer recently disconnected) and 21( Oxyen sensor with bad connection or the Oxyen sensor is bad. My first thoughts are maybe the Jeep was running rich, giving the Oxyen sensor code. Maybe is a bad air temperature sensor or a coolant temperature sensor. Any help on this one?

 

Bad battery connections will give you that fault code.

 

I don't think it's the battery I have power. It's not cranking. I' m thinking it's the fuel pump. When get home I'm going to pull the fuel line off the fuel rail put them in a bottle and see if their spraying gas when try to start the Jeep.

 

You're obviously not well schooled in Amps and Voltage.

It takes 3 amps of 12 volts to turn interior lights on.

It takes 200 plus amps of 12 volts to turn a starter.

Have you ever cleaned your battery cables? Checked the level in the battery?

 

Well I work for a battery company in fact the largest manufacture of Industrial battery. We also make the Odyssey battery and diehard platinum battery. So I know a thing or two about voltages and batteries. But anyway what terminals are clean the wires are connected well and the voltage and battery 12.84 without the Jeep running.

 

I'm going to go further and say a couple things. When someone says "it's not cranking" it means that when you turn the key to the start position NOTHING happens. So how would you conclude that this means the fuel pump isn't working?

Since it started and stalled my first guess is that the alternator might be bad, and I'll tell you my reason. Enough battery voltage/amperage got the vehicle running, but without an alternator the running engine drained the batter to a LOW point that would not allow it to continue running.

Your next course of action, after checking cables and such, would be to jump the battery from another good battery with good cables. Then report back what happens.

 

Correct. How about the other end of the cables and the cables themselves?

 

I will check all the connections again when I get home. I did have a problem with corrosion on the negative battery cable that connects to the fuse box. I did check to see if the corrosion was re occurrence but it was clean. The Jeep cranks like it wants to start but doesn't turn over.

 

Clarification? It cranks over but doesn't START?

 

Yes and it the positive battery terminal that's connected to the fuse box that I have problems with a little corrosion on the terminals. I just checked and there is no spark coming of the coil to the distributor cap. . So maybe I'll have a bad rotor or coil. Hopefully is not the computer.

 

Probably a bad CPS. Check to see where the Remote Starter gets it's tach signal from and disconnect it just in case.

 

Dictionary of Automotive Terms.
http://www.autospeak.com/terms01.htm

 

Really

 

Just an update the problem with my jeep not starting ending up being the ignition coil. I know a lot of you all ready know not to waste your money on the accel ignition coil, but if you don't do yourself a favor an stay a way. When I first put the coil in two an half years ago the jeep ran really smooth with an improved throttle response, the gas mileage stay the same for the most part. The Accel coil has a lot of bad reviews online and now I know that is not BS. Maybe I will try the MSD coil they have good reviews or maybe I would just keep it stock. I' m starting think all of theses upgrades are really for a storker engine 99+ manifold, injectors, etc.

 

Glad you found the problem. Next time something like this happens, the first thing to do is check for spark. If you have spark, then test fuel pressure.