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Old 09-19-2009, 12:07 AM   #1
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99 TJ electrical problem?

Started after battery died. While driving the engine will stumble, sometimes ping a little and shut down or clear itself and be like normal. When it shuts down, can turn the key and will start and shut right down, after that takes 2 or 3 times to restart and will run fine. this might last for a day or more or 2 min. I am not getting any codes from computer. Am hoping someone might have some insitye to this problem. I was thinking electrical, maybe stator or problem with distributor. Any help is greatly appreciated.

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Old 09-19-2009, 12:32 AM   #2
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Odds are the battery is just so low that the alternator is barely working. The alternator requires 12 volts from the battery to work so if the battery is too low, the engine won't run well because the alternator won't put out its normal voltage. If the battery is totally dead, the engine will even die after being jump started after the jumper cables are disconnected.

I'd put the battery on the charger overnight and see if that doesn't help. If it doesn't, have the battery load tested at a battery shop which will give the battery's health. Don't forget to give it a good overnight charge, a couple hours may not do it. Don't forget to wire brush the battery connectors and posts and make sure the connectors are good and tight on the battery posts when you're done.

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Old 09-19-2009, 07:30 AM   #3
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The battery load tested good and has a full charge. The alternator also tested good. Like I said, while driving down the road, the engine will lag for a second then shut down, just like you turned off the key, or if at an idle, it will stumble, ping like timing is off then shut down. will restart, but shuts right down again. when you try to restart it, takes 2 or 3 times then will run like nothing happened. this doesnt happen all the time. There are no codes that the computer is showing. I'm at a loss.
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Old 09-19-2009, 11:08 AM   #4
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its just the comp relearning how to idle. after i have my battery unplugged while working on the jeep i have to force it to idle for several days. then all of a suddon TADAAA it works fine.
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Old 09-19-2009, 11:17 AM   #5
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Quote:
Originally Posted by masterofyard View Post
The battery load tested good and has a full charge. The alternator also tested good. Like I said, while driving down the road, the engine will lag for a second then shut down, just like you turned off the key, or if at an idle, it will stumble, ping like timing is off then shut down. will restart, but shuts right down again. when you try to restart it, takes 2 or 3 times then will run like nothing happened. this doesnt happen all the time. There are no codes that the computer is showing. I'm at a loss.
That's making me think it could be your CPS (crankshaft position sensor) going out or, slightly less likely, the camshaft position sensor.

The crankshaft position sensor is mounted next to the flywheel high on the driver's side and it provides the engine's master timing signal. They can go bad and cause your exact symptom. No guarantee of course.
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Old 09-19-2009, 03:01 PM   #6
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I was thinking same thing....but not throwing any codes from computer. I am also thinkoing, possibly the pick up min the distributor.
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Old 09-19-2009, 06:48 PM   #7
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Old 09-20-2009, 02:49 PM   #8
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update...I replaced the pick -up, cap and rotor. The engine seems to be idling a lot better and so far...knock wood...no stalling or sputtering. I'm hoping that this will solve my problem. If anyone has any other suggestions..i'm all ears.
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Old 09-22-2009, 12:59 AM   #9
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update to the update...took my jeep on a long haul and put it throught the wringer with no problems. I'm pretty sure with me replacing the cap, rotor and pick up, it solved my problem.

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