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Old 08-15-2010, 10:02 PM   #1
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Join Date: Jul 2010
Location: Lubbock tx
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My 93 wrangler 4.0 dies.

I can be driving along just fine the the jeep will just die some times I can key off and back on and it will pick up and go again and the problem is very intermittent. I have put new plugs, wires, distributor cap, rotary bug, crank sensor, coil and even a new optima batter which I know helped nothing but the old one died so I need a new one anyway so anyone out there had this problem or give me some ideas of what it could be.

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Old 08-16-2010, 06:32 AM   #2
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You might want to check your fuel filter. If it is dirty it will clog and shut down the engine.

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Old 08-16-2010, 10:57 AM   #3
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There is a wire that hooks up to your Emergency brake cable. If it is loose or has come off it can cause the ECU to intermittently shut off the engine. Check to make sure it didn't get knocked off.
Also remove the ECU wiring harness and have a look at the connection terminals. The factory Dielectric Grease used to seal the terminals from moisture is 17 years old on your Jeep. The grease may be dried up and allowing moisture to get in there. It may be time to clean the terminals and replace the grease.
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Old 08-16-2010, 05:50 PM   #4
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Wrangler Haven has a good point with the ground wire that is usually grounded on one of the mounting bolts of the E-Brake assy.
Go ahead and check for codes first and foremost when an issue such as this comes up.
Another thing to check is the CPS, take it off and clean it with a good electrical cleaner and reinstall it. The crankshaft position sensor detects the rotation of the flywheel and sends the ok signal to the ECM so that it will send gas and fire to the cylinders. It could be loosing its signal therefore telling the computer the engine has stopped and doesn't need fire and fuel.
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