2005 LJ Not Starting - JeepForum.com
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post #1 of 13 Old 06-06-2020, 04:02 PM Thread Starter
BigD6765
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2005 LJ Not Starting

Hey all, thought I'd get some opinions on likely causes. I have a 2005 LJ Rubicon, 4.0L, Auto Trans. It's got 60k on it and hasn't been used all that much (occasional trails / vacations). At any rate, took it in this past week for new tires, re-torque my lift, and an oil/lube.

Picked it up this morning...all good. Started right up and off I went. Stopped to fill up, again all was good. Drove about 40 miles to feel her out and, again, all good. Parked it, went in the house and did a few things...about 2 hours passed and I went out to reset my speedo (have a Speedohealer in-line correct) as I went to a larger tire. Did that and went to fire her up...no start.

I turns over well, will hit slightly, but not run. I can smell some gas if I crank her long enough so I would guess it's getting fuel. I can't imagine it's bad gas? When I filled up, I put 13.5g in it (19g tank). It didn't even have a hint of sputter or anything on the way home. I ran the battery down trying to start it. Did a deep charge on it and same results.

Anyhow, thought I'd see if this has some potential standard issues that it might be.


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post #2 of 13 Old 06-06-2020, 06:34 PM
jtec
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any codes?
Check fuel pressure.

Spray carb cleaner into TB as someone tries to start - did it fire try to start on the spray?

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #3 of 13 Old 06-06-2020, 06:51 PM
mukluk
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It ran fine before you messed with the Speedohealer and won't fire up afterward... I'd start by checking the connections in that area and anything you may have disturbed.

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post #4 of 13 Old 06-06-2020, 10:26 PM Thread Starter
BigD6765
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Quote:
Originally Posted by jtec View Post
any codes?
Check fuel pressure.

Spray carb cleaner into TB as someone tries to start - did it fire try to start on the spray?
I don't have a code reader...but getting me one. I'll try the carb cleaner.
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post #5 of 13 Old 06-06-2020, 10:28 PM Thread Starter
BigD6765
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Quote:
Originally Posted by mukluk View Post
It ran fine before you messed with the Speedohealer and won't fire up afterward... I'd start by checking the connections in that area and anything you may have disturbed.
I have been racking my brain on that one too. I'm gonna disconnect it completely and see what happens. All I had done, was hit the buttons on the bottom of the unit to set for the new tires. I can't imagine that would've done anything, but I guess anything is possible.

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post #6 of 13 Old 06-06-2020, 10:31 PM
AjRagno
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If you cycle the ignition from Off to On three times any stored codes will be displayed in the odometer.
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post #7 of 13 Old 06-06-2020, 11:25 PM Thread Starter
BigD6765
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Quote:
Originally Posted by AjRagno View Post
If you cycle the ignition from Off to On three times any stored codes will be displayed in the odometer.
good tip...did not know that...

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post #8 of 13 Old 06-06-2020, 11:31 PM
Duck Doctor
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Check the wiring for the speedohealer. About six years ago the front driveshaft rubbed the wire running from the speedohealer to the transfer case. Caused all sorts of electrical gremlins that took quite sometime to identify as the culprit.
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post #9 of 13 Old 06-07-2020, 12:34 PM Thread Starter
BigD6765
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Update: At least part of situation uncovered. What I did this morning in order...

1. Disconnected and reconnected all SpeedoHealer connections.
2. Tried to start vehicle...same response.
3. I have an OBDII reading device I bought years ago... Naturally, it only works on Android phones and we now have Apple...soooo...
4. Found an old Android phone and had it read my OBDII. Did have code P0562 (system voltage low) and P0700 (Transmition Control System).
5. Decided to unhook the SpeedoHealer, and it fired right up.

Now, my battery is fairly old. If I don't run it for more than 2 weeks, it will likely not start. I do plan on replacing the battery. As my only x-factor was messing with the SpeedoHealer, obviously that seems to be the issue. Strange thing is, it was working fine before...all that was done was I changed the settings on it to account for my larger tires.

I wish I would've cleared the codes before unhooking the SpeedoHealer, but I didn't. I guess that unit is bad? Anyone else have one just go caput on them?

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post #10 of 13 Old 06-07-2020, 02:13 PM
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Like Duck Doctor suggested, you should check the wiring for the Speedohealer to see if it's chafed on something or shorting out. The VSS shares the 5v supply and common ground used for most of the engine's sensors, so a short in that wiring will take the whole lot down.

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post #11 of 13 Old 06-07-2020, 04:44 PM Thread Starter
BigD6765
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Quote:
Originally Posted by mukluk View Post
Like Duck Doctor suggested, you should check the wiring for the Speedohealer to see if it's chafed on something or shorting out. The VSS shares the 5v supply and common ground used for most of the engine's sensors, so a short in that wiring will take the whole lot down.
Gave it a good look and didn't see anything out of the ordinary. No open wires, rubs, anything.

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post #12 of 13 Old 06-29-2020, 11:33 PM Thread Starter
BigD6765
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For those that are interested, I never did find anything that would cause this issue. Obviously, something went wrong with the wiring...putting it back caused the same issue. So, my speedo will remain off a bit.

Of course, I have now gone from 33's to 35's, so it's off a little less than it was before.

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post #13 of 13 Old 07-02-2020, 12:02 AM
mukluk
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If reconnecting the Speedohealer replicates the no start issue but the Jeep works normally when the stock VSS wiring is restored, then the problem is a short in the Speedohealer unit or its wires. Your options are to hopefully find and fix the wire problem, replace the unit, or leave things as is while being mindful of the indication error.

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