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Old 09-09-2017, 06:01 PM
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08 Rubi Starting Issues

I'm having an issue with an intermittent starting problem. This has been going on for a few months so I'll give you the run down. I do not have any after market mods that tap into the electrical system. My Jeep is an unlimited with a 3.8 and Auto trans. The symptom is when I turn the key, the starter will engage but it won't turn the engine over. Sometimes after a few attempts it will roll over and start. The battery is lees than a year old and I've had it tested several times. The voltage across the terminals is usually 12.6V. I can repeatedly start is at this voltage when it's not acting up. I replaced the starter when this first started happening, thinking that maybe there was a bad spot in th e starter. Everything was fine for a week then it started doing the same thing again. I went over all of my electrical connections and grounds, including the TIPM. I cleaned all of them and made sure they were tight. A few days later it happened again. I bought a new ignition switch but did not install it. I waited for the problem to happen again and when it did, I didconnected the connecter from the switch that was still installed and connected it to the new one. I inserted my key and turned it to the Run posistion to satisfy the security chip and unlock my column. I turned the new switch with a screwdriver and after several attempts it started. This rules out a bad starter switch.
So now this is where I'm at. Do I have a new starter that also has a bad spot in it that I can't duplicate at the auto parts store to exchange it for a new one, or do I have a bad TIPM? They are too expensive to go on an "easter egg hunt" (any military or retired will understand my terminology). I'm thinking that my next step is to install a switch directly to my starter so the next time this happens, I can insert my key and roll it to the run position, then hit the starter from the switch. If this works every time all the time, rthat would eliminate the starter. Does that prove the TIPM is bad or have I missed something?? I need the electrical diagram for the entire starter path. Can anyone help me there?

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Old 09-09-2017, 06:14 PM   #2
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When that happens try starting it in neutral. 08 JK's seem to have more no start issues than other model years. If it starts in neutral then it's most likely the Transmission Range Sensor. If it still doesn't start there could be a lock up of the Wireless Control Module. Or, there could be a ground issue. It could be the TIPM, but the other areas that I mentioned should be ruled out first. There's more info. here regarding the WCM: http://project-jk.com/images/tsb/TSB_08-007-08-REVA.pdf

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Old 09-09-2017, 06:36 PM
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Is the WCM refering to a remote start feature? I dont have this feature, but would there be anything related to this that would have been installed as an industry standard anyway? Thanks for the info on the Trans. I would not have thought of that but will give it a go when it happens again.
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Old 09-09-2017, 10:22 PM   #4
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Quote:
Originally Posted by FC1Ret View Post
kik
Is the WCM refering to a remote start feature? I dont have this feature, but would there be anything related to this that would have been installed as an industry standard anyway? Thanks for the info on the Trans. I would not have thought of that but will give it a go when it happens again.
It's not connected to a remote start feature. It is connected to the Sentry Key Remote Entry (key fob used to remotely unlock/lock the doors). Remote start wasn't a factory option in 08. The SKREEM is just another name for the Wireless Control Module.
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Old 09-10-2017, 01:42 AM   #5
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It sounds like a ground problem to me!
Just run a 4ga wire from the neg battery to the alternator top of the bracket and I bet that will fix your problem.
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