4 banger won't start, battery or not?? - Jeep Wrangler Forum

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Old 12-30-2010, 10:16 PM
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4 banger won't start, battery or not??

My 99 SE wouldn't start today. It clicked and I stuck the battery charger on it. After a couple hours I tried it again and still nothing so I figured the battery was shot. I pushed it out the garage to jump start it off of my other car. It would crank over and start but as soon as I let off of the key it would die. If I kept the key in full forward position it would stay running. A couple times I was able to really rev it up and it would stay running but as soon as I let off of the gas peddle it would die. I have never had a vehicle act like this from a dead battery. Have you guys experienced this before or not? Does it sound like a battery only or could I have alternator problem or something else?
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Old 12-30-2010, 10:26 PM   #2
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Have you tried unplugging the battery, cleaning the connectors and then trying it? This is what happened the other day to me.

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Old 12-31-2010, 01:41 AM   #3
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Sounds to me like you MAY have multiple problems.

First, check your belt for tightness and glazing/cracking (Jeep IS 11 years old) which would allow your alternator to not output correctly at lower speeds (may be why it continues to run at higher speeds) and allow battery to discharge with time.

Second, as mentioned in previous post, disconnect Battery Post Clamps and clean them until "shiny bright".....do not forget to do the same to the INSIDES of the clamps. This corrosion spot could have prevented your battery charger/alternator from charging your battery. Also, a discharged battery can take HOURS to recharge, depending on the amperage of your charger.

Third, make sure clamps are re-installed on posts and CANNOT be wiggled by hand after tightening.

Fourth, IF you can get vehicle running, measure across battery terminals with a voltmeter (or observe your dash voltmeter). Should be greater than 12.5 volts. This could be as high as 15 volts and should not drop below 12.5 volts with ANY and all accessories (lights, heater, blinkers, etc.) turned on.
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Old 12-31-2010, 09:58 AM   #4
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I had same issues with posts. Ended up changing them and have not had anymore issues with it starting. Also after a dead battery the computer resets and takes a few min to reset the parameters for engine idle running. Mine i had to keep reving it to stay running, then it was ok.
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Old 12-31-2010, 10:14 AM   #5
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Agreed on it sounding like there may be at least two and maybe three issues.

#1 The engine will NOT run with a dead battery once the jump start battery is disconnected. The alternator REQUIRES 12 volts from the battery to work so if the battery is dead, the alternator won't put out any power and the ignition system won't work. Older generators and some other types of alternators continue to work without needing battery voltage but this is not true of the type of alternator the Jeep uses.

#2 Loose, bad, or corroded battery connections can cause strange problems. The connections can even look ok but still be causing problems. No matter if they look ok or not, remove both battery connections and then wire-brush the battery posts and the inside of the connectors then securely reinstall them. Make sure the connectors are tight enough that they cannot be moved or rotated on the battery posts.

#3 If it will only run when the ignition switch is held rotated past 'On', that indicates a bad ignition switch or wiring leading to the 'On' connector of the ignition switch.
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Old 12-31-2010, 07:37 PM
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I got in a new battery and that fixed the problems. My cables were fine. I friend of mine works at a dealership and I was talking to him about what happend. He said that when the key is still in the full foward position the system is using the battery and the alt. for power. Once you let the key back to regular position it is only running off the alt for power and the battery might have had enough juice combined with the alt to keep it running. Anyway the cables were perfectly fine and the new battery fixed the problem.

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