Question about 1994 Jeep Wrangler

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1994 jeep wrangler will turn over but wont start check doesnt come on at first if you let it sit 10 min or so the check engine light will finally come on and it will start and as long as check engine light comes on it will start

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Your engine computer is going bad. There are three capacitors inside the ecu that are going bad, unable to hold current. You can replace the entire ecu or try and change out the capacitors in your ecu. It's a common problem with early 90's jeep ecu's.

Posted on Jan 04, 2011

  • Michael J. Wheeler May 13, 2012

    which capacitors are they? the electronics in the ECU are encased in a rubberized gel; how do I gat this stuff off, and what do I replace it with once I fix the capacitors?

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Problem starting


If the check engine light does NOT come on when cranking, at the times when it won't start, and the relays are clicking and buzzing, then your ECU is in need of repair. The engine will only start after the check engine light comes on and the ecu is what controls that. ECU is likely going bad, causing the delayed start problem typical of early 90's jeeps. Reasonably priced repair or replacement services for your jeep ECU are available on ebay.

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1 Answer

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check fuel pressure regulator and fuel pressure. should be between 45-50 psi and hold steady.. shut off car and let sit 5 min if pressure drops more than 10 lbs one of the two is bad...

Jul 07, 2012 | 1998 Jeep Wrangler

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My 1994 Jeep Grand Cherokee with the 5.2L is very difficult to start if it has not been run in the previous 6 hours. Replaced ignition coil but didn't solve the problem. After sitting overnight it


Low fuel pressure.
You need to check the fuel pressure on the first crank and watch it as it is running.
Requires a special gauge.
If it were just a starting problem I would say it could be a pump relay, but not if it runs rough for 5 min.
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1 Answer

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If your check engine light does not illuminate when you turn the ignition on then your jeep ecu is in need of repair. The check engine light has to be on for the fuel pump to get power. Try leaving the ignition key in the on position for a few minutes to see if the check engine light does eventually come on and if the fuel pump starts to work then.

Jun 15, 2011 | 1994 Jeep Wrangler

1 Answer

1994 jeep wrangler no power to coil.....will crank....wont start....changed cps....still does not start....flywheel problem? help...thanx


Is the check engine light lighting up on the dashboard, when you turn the ignition key to on? If not then your ecu is in need of repair since it is not sending power to the coil and probably also not to the injectors also.

May 02, 2011 | 1994 Jeep Wrangler

1 Answer

1995 JEEP WRANGLER 2.5L HARD START COLD 1 START OF THE DAY


When you're trying to start it for the first time of the day, look at the dash to see if the check engine light is on when you first turn on the ignition. If the check engine light is not lit up, your Jeep ecu is in need of repair and the vehicle will not start until that check engine light finally comes on.

Apr 18, 2011 | 1995 Jeep Wrangler

1 Answer

Hi can u help me plz my 1994 jeep grand cherokee laredo 4.0L Automatic have problem with it before I start my jeep, i have to let it sit with the key in the "on" position for 5-10 min may be more...


Your ecm is going bad. If you haven't noticed yet, the vehicle will only start once the check engine light comes on, on the dash. That's the ecm finally sending power to the relays that feed the fuel pump and ignition systems. If you're mechanically and electrically handy you can remove the ecm, disassemble it and replace the three power capacitors inside. If not, just have the ecm checked and replaced.

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1 Answer

1994 jeep wrangler 6 cyl 5 spd no start


have u ck out the ignition switch [not the key & tumblers],, or the neutral safety switch to see if u have power ,,also seen broken wire at solenoid on starter too,,hope it helped,,

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1 Answer

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could be the cap and rotor or the pick up in the distributor

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1 Answer

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replace the altenator and charge the batt. or get new batt. u just dont have enough power to start it without a working altenator

Dec 08, 2008 | 1994 Jeep Wrangler

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