Collector grade Jeep Wrangler TJs for sale

2002 Wrangler no start

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Pjhanlo

New Member
Original poster
Joined
Oct 10, 2024
Messages
14
Location
Lancaster, PA
2002 Wrangler Sport
4.0 Automatic

Hey guys, I’m experiencing an issue where when the key turns to the start position you can hear my starter click once underneath the passenger floorboard but nothing else happens.

Battery is at 12.6, connections have been cleaned
New starter
starter fuses look fine, swapped them for others on my fuse box to test.

I thought it might been an ignition switch or ignition switch actuator. I replaced those a few days ago and the jeep actually started up fine. Now surprise it’s happening again.

Any ideas? Thank you guys in advance
 
What happens if you put it into run and jumper the little post with the battery post? Make sure the brakes are on and it's in neutral.

-Mac
 
Sounds like the starter pinion isn't engaging with the flexplate. Take the starter off so you can see what it's doing. It should extend into the cavity which makes it engage the flexplate teeth.
 
hear said:
Sounds like the starter pinion isn't engaging with the flexplate. Take the starter off so you can see what it's doing. It should extend into the cavity which makes it engage the flexplate teeth.
Click to expand...

This is the second starter since trying to resolve this issue. could it be wiring related?
 
Either the starter isn't engaging with the the flywheel teeth...like the bendix isn't extending...or your flywheel doesn't have teeth.

-Mac
 
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Pjhanlo said:
This is the second starter since trying to resolve this issue. could it be wiring related?
Click to expand...

Could have enough corrosion in the wires or connections that the voltage/amperage is too low for the bendix to push out.

What's the voltage at the starter through the starting attempt?

-Mac
 
Sorry for the delayed response guys. So I’ve narrowed it down quite a bit.

Jeep will start when completely cold.
But will not crank whatsoever after being ran and sitting for a few minutes.

However the jeep will start if I jump the pins on the relay. I’ve tried swapping relays from another spot
 
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Pjhanlo said:
How would I go about doing that?
Click to expand...

unplug the NSS from the side of the transmission and put a jumper wire across 2 of the 3 pins (I'm not sure which 2 off the top of my head but it can only take you at most 3 tries...no risk if you get it wrong).

If it always starts when cold and never starts when warm, I'm wondering if one of the starter wires is getting really hot which is increasing the resistance in the wire, enough so that the starter doesn't get enough juice to fire. I used to have a 66 Mustang and while I never experienced it, it was a pretty common thing. I've never actually heard about it here though. Measure the voltage drop across all the starter wires while cold and then while hot & compare.
 
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hear said:
unplug the NSS from the side of the transmission and put a jumper wire across 2 of the 3 pins (I'm not sure which 2 off the top of my head but it can only take you at most 3 tries...no risk if you get it wrong).

If it always starts when cold and never starts when warm, I'm wondering if one of the starter wires is getting really hot which is increasing the resistance in the wire, enough so that the starter doesn't get enough juice to fire. I used to have a 66 Mustang and while I never experienced it, it was a pretty common thing. I've never actually heard about it here though. Measure the voltage drop across all the starter wires while cold and then while hot & compare.
Click to expand...

I’ll give it a shot when I get off work tonight. Thank you

If it starts up fine when hot by jumping the pins on my starter relay wouldn’t that eliminate battery/starter issues?
 
Upon closer inspection of the NSS the middle wire on the sensor was a little loose.

Maybe the heat caused increased resistance in that wire like Hear previously stated with another wire.

Replaced the connector and the issue is completely resolved.

Thank you guys
 
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