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post #1 of (permalink) Old 01-20-2004, 11:04 AM
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YJ Gods..i bring sacrafice

94YJ, 4.0, 5spd
I'm in over my head. I swapped in an Optima red top after leaving my lights on over night(old batt was shot)Things went downhill. The Jeep then proceeded to crank but not fire. Connections good along with spark/fuel/air. Today, I did a push start and it ran....untill I took my foot off the gas. Drove a few miles and it started as long as i gave it gas. Digging deeper I read about the speed sensor, automatic idle sensor, and the and the auto shut down relay. The chiltons says crap for theory of operation so i interpret it my way. I get spark; rule out speed sensor. It runs other with my foot on the gas; Does this rule out the auto shut down relay? Automatic Idle thingy-ma-jig; From the name I deduce that it holds the trottle open. Am I right?
The only other thing is I've been "stuck" in 4wd for a couple weeks. The light stays on (i'm thinking its the control switch) Could that tie into the speed sensor? One shorted out the other? I don't see how from the schematics. Any help will win you my Guru Of the Month award!
*edit* When get the codes off the engine light it flashes 3 then 5 then 5. Seems jibberish to me.

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post #2 of (permalink) Old 01-20-2004, 11:27 AM
Way Outta Control
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Location: The Palouse
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Re: YJ Gods..i bring sacrafice

1. The codes are not gibberish,
2. You've got to recover them...
3. It's the FIRST place to start...
4. You can find there meaning Here..., among other places.
5. So re-recover the codes and wite them down!
6. If you've got spark,
7. The ASD is working.
8. If you've got spark and no fuel,
9. The ASD is STILL working.
10. If you've got no fuel,
11. AND no spark,
12. THE ASD has removed power to[*]The Fuel Pump[*]The ignition system
13. If there's not a signal from the Crankshaft Position Sensor,
14. The ASD dropps out,
15. And the engine dies.
16. But since you've got spark and fuel,
17. I'd rule out the ASD relay,
18. And be looking at something more sever,
19. Did you at any time reverse the battery connector?
20. Does the Jeep idle fine if the transmission is in neutral?
21. Can you put the transfer case into neutral?
22. Then what happens?
23. The idle speed control motor,
24. Introduces a measured volume of air into the throttle body,
25. To hold the idle at the proper RPM.
26. Did you get the TPS sensor wet at any time?
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post #3 of (permalink) Old 01-20-2004, 11:46 AM
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Re: YJ Gods..i bring sacrafice

LEVE--You're right. The codes were not gibberish. I ran out and did the on-off-on-off-on 3 times. it's code 12(battery disconnected) then 55(test complete). The battery terminals weren't reversed as far as I know. Had one of my troops working with me I'll call and ask him. What would the case be if they did get contact reversed?
The Jeep won't idle in neutral. It will only start if I've got pressure on the go pedal. Same situation when the T-case is in neutral. It's still warm from the push start so I'm not sure if it will start when completly cold.
As for the TPS (throttle postition sensor???) Anything can get wet living in Germany. It's been raining for about 3 weeks. Back to the repair manuals. Thanks LEVE
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post #4 of (permalink) Old 01-20-2004, 11:56 AM
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Re: YJ Gods..i bring sacrafice

1. There are no codes being thrown...
2. That's a good thing.
3. I'd be looking at the idle speed motor,
4. Pull it,
5. Clean it,
6. Clean the hole it goes into on the Throttle Body.
7. It's a starting place...
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