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Old 05-10-2014, 07:04 PM   #1
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Angry 2000 TJ Wont Start

I have a problem. My Jeep won't start. So, here is the situation. I had the Jeep started and idling for about 3 minutes then turned it off. 5 minutes later, it wouldn't start. Here are the symptoms.

1. Battery is good. Cranks fine, will continue to crank. All lights and sensors activate with the key turns. I tried to jump it as step two. Still cranked and wouldn't start.

2. Fuel is good. Step one I put 3 gallons in the tank even though the gage showed 3/8ths of a full tank. Maybe the gauge was bad. It's not.

3. If anyone else has these issues or fixed it any advice would be appreciated.

Thanks

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Old 05-11-2014, 08:18 AM   #2
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any codes?

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Old 05-11-2014, 08:33 AM   #3
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Originally Posted by Ranger1993 View Post
I have a problem. My Jeep won't start. So, here is the situation. I had the Jeep started and idling for about 3 minutes then turned it off. 5 minutes later, it wouldn't start. Here are the symptoms. 1. Battery is good. Cranks fine, will continue to crank. All lights and sensors activate with the key turns. I tried to jump it as step two. Still cranked and wouldn't start. 2. Fuel is good. Step one I put 3 gallons in the tank even though the gage showed 3/8ths of a full tank. Maybe the gauge was bad. It's not. 3. If anyone else has these issues or fixed it any advice would be appreciated. Thanks
You have fuel, but do you have fuel pressure? Can you hear the pump? Also have you checked for spark yet?
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Old 05-11-2014, 10:56 AM   #4
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I would still recommend having both battery and starter checked free at places like Autozone. If both are good, check the relays under the hood along with fuel pressure, which should be around 49psi.(+/-5).
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Old 05-11-2014, 12:25 PM   #5
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No codes and I don't hear the pump. So I am going with replacing the fuel pump and fuel filter while its under repair.

Thanks for the advice. Lets see if this works and go from there.

I am sure I am getting spark because it started and idled just a few minutes before. This is the first issue I have had with the Jeep. Pumps and stuff goes wrong once in awhile.

If it doesn't work, I will be back for more help. LOL
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Old 05-11-2014, 12:49 PM   #6
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You're certain you don't hear the fuel pump even briefly? It only comes on for a second or two after turning the ignition to the On position and then shuts off before starting the engine.

Is the fuel pump relay energizing in the Power Distribution Center in the engine compartment? Try swapping the FPR with another relay with the same size & shape, they're all the same.

Whether the fuel pump is energizing or not when you first turn the ignition on is important to troubleshooting this... I wouldn't jump at replacing the fuel pump just yet, that's a big job. I'd stick my head under the Jeep's gas tank while a helper turns the ignition switch to the On position to verify whether it is briefly cycling on then off as normal.

Not starting is more commonly caused by something else like a bad crankshaft position sensor or less frequently a bad camshaft position sensor.
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Old 05-11-2014, 02:49 PM   #7
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Ok, I have done some more troubleshooting. The 20A fuse that is for the injectors keeps burning out every time I turn it over. I have replaced three now. How do I find out where the bad ground is?

Thanks
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Old 05-11-2014, 03:04 PM   #8
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Check to make sure there's not any bare wires touching underneath the fuse box or around the engine compartment
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Old 05-11-2014, 04:34 PM   #9
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Ok, Found a broken ground wire. Attached the wire and ensured I had a good ground then started the Jeep right up.

Thanks everyone for the advice. I would have gone through a lot of trouble and money without fixing the real problem. Always learning about something is good and not being too proud to ask for advice and listen to experience is a learned talent.

Thanks again.
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Old 05-11-2014, 09:23 PM   #10
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Good job getting it fixed!
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Old 05-11-2014, 09:52 PM   #11
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Originally Posted by Ranger1993 View Post
No codes and I don't hear the pump. So I am going with replacing the fuel pump and fuel filter while its under repair.

Thanks for the advice. Lets see if this works and go from there.

I am sure I am getting spark because it started and idled just a few minutes before. This is the first issue I have had with the Jeep. Pumps and stuff goes wrong once in awhile.

If it doesn't work, I will be back for more help. LOL
No dont its the crank sensor on the top of ur bellhousing had same issue but my odo read no bus acrossed it

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