Issue starting Jeep - JeepForum.com

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post #1 of 20 Old 07-20-2011, 12:01 PM Thread Starter
f1rocco
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Issue starting Jeep

Hi Guys,

So I have a 2008 Jeep wrangler Sahara and I am having problems starting it. It started a couple months ago when I left the lights on and the battery drained. I got it boosted and everything was fine. A couple weeks later the Jeep was having trouble starting and needed a boost from time to time. I was told to turn my lights on and then start the Jeep and it worked without a boost. A couple weeks after that this trick did not work so I figured it was the battery. I replaced the battery and everything was fine...for about a month, then just yesterday it has trouble starting and when I use turn on my lights then start it, it works. I did not leave anything turned on for the battery to drain. Also, it doesn't always happen just from time to time. Once yesterday and once today. Sorry for the long post. Thanks in advance!

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post #2 of 20 Old 07-21-2011, 03:00 PM Thread Starter
f1rocco
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Anyone?
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post #3 of 20 Old 07-21-2011, 04:18 PM
DILIGAF
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Clean the throttle body bet there is a lot of black stuff in there and run a can of seafoam through the tank.

Coasty
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post #4 of 20 Old 07-21-2011, 04:35 PM Thread Starter
f1rocco
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Thanks for the help. Do you know any good write ups on it? Where exactly would I run the can of seafoam through? Thanks!
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post #5 of 20 Old 07-21-2011, 04:43 PM Thread Starter
f1rocco
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I was looking through throttle body forums and I see alot of people saying that the newer jeeps shouldn't need to have this done. Also if I boost the jeep it works so how would that require a TB cleaning. Thanks in advance
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post #6 of 20 Old 07-21-2011, 06:50 PM
grim-reaper
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I have an 08 and have a similar problem which is getting worse (couldn't replicate it when it was at the dealer for service, now that warranty is over it's more common). I think it's a defective Transmission Position Sensor? Anyway, while the key is off shift it into Reverse or Neutral and then back into Park and it will start everytime. Let me know if that cures the problem.
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post #7 of 20 Old 07-21-2011, 09:14 PM
chieferz
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I had/have a similar problem as well with my 08 Rubi. Same as what grimm-reaper said, just move your shifter, what I have to do is push it forward a little more and that always works. I would guess that somehow somewhere the neutral safety start switch linkage is slightly out of adjustment. I haven't looked closely at mine yet, cause it rarely happens, and when it does I just push the shifter forward and she cranks right over. Hope that helps
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post #8 of 20 Old 07-21-2011, 09:41 PM
Charles
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Put an multimeter on your battery and check the voltage. Watch the voltage as you start it. If it drops too low you know it's your batter. What kind of battery did you put in it?

Turning the lights on doesn't make any sense. I don't have any idea why that variable would correct the problem. It should make it worse sense it is putting a larger load on the battery.

You HAVE to eliminate the battery as the problem before you go chasing more obscure less likely problems.
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post #9 of 20 Old 07-21-2011, 10:25 PM
motor_car
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Uh, yeah, died-in-the-wool car buffs and absolutely all British car afficionados swear that turning on the headlamps helps. The explanation is that the thin positive wire, not the fat one that runs to the starter motor, the thinner wire that powers everything else oxidizes in the crimp terminal. When the vehicle sits, the oxidation creates a high resistance from the battery to the electrics and that prevents the starter relay to close to actuate the starter solenoid, etc, etc.
If you turn on the headlamps, that puts a load on the circuit, the oxidized terminal and wire heat up and burn off the oxidation and then the starter relay gets enough juice.
I am sure Adam Savage, Jamie Hyneman would give this a "plausible"
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post #10 of 20 Old 07-22-2011, 08:30 AM
blackpaw
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Charge the battery with a battery charger overnight. The vehicle will start very well the following day.
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post #11 of 20 Old 07-22-2011, 12:01 PM
WXman
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You need to regear. Just ask JIMBOX.

'92 YJ - heavily modded
'96 ZJ - heavily modded
'05 KJ CRD Limited - 370 lb./ft. from a 4-cylinder and trail ready. Pure awesomeness.
'11 Mango Tango JKU Sport - Mods
'12 Dozer JKU Sport S - 6-speed - ACE rock rails - Max Tow package - Daystar spacers - 33x12.50 Duratracs
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post #12 of 20 Old 07-22-2011, 12:12 PM
jstrubberg
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First thing I would is walk out, open the hood and put a meter on the positive side of the battery and see if you have a vampire draw somewhere. It's either that or the new battery you bought is cheap/defective.

You're losing amperage somewhere.
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post #13 of 20 Old 07-22-2011, 01:09 PM
DidioJK
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I just re-geared and now mine is doing the same thing.
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post #14 of 20 Old 07-23-2011, 12:09 AM
mikejku
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Need specifics. When this problem occurs, does the engine turn but not start? If not, when you turn the key, is there an audible clicking noise? Or does it do absolutely nothing at all?
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post #15 of 20 Old 09-10-2011, 06:06 AM Thread Starter
f1rocco
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Sorry I didn't reply because I was not having the issue any more...until now. So I decided to move the shifter into neutral and it starts everytime. Thanks for the tip. Now next step is to fix it...

Mikejku not sure if you will get this 2 months later but the engine does turn but does not start and when I turn the key there is an audible clicking sound.

Thanks for all the help everyone!
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