Question about 1990 Jeep Wrangler

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88 grand wagoneer wont run

My 5.9 will not start. I think its the ignition module, coil is new, strong battery, cranks over very well. the spark is very weak/ none at all. when i let go of the key while starting the motor it tries to start! Could this be a ground problem or is the module or computer bad? Appreciate any advice you may have.

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  • Rob Houg
    Rob Houg May 11, 2010

    This could be a timing issue

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  • 33 Answers

It sounds like ignition switch is going bad." when i let go of the key while starting the motor it tries to start! "

Posted on Jan 06, 2009

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Posted on Jan 02, 2017

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97 olds 88 runs rough first few seconds, when you shut it off it will not crank. Had the ignition control module tested and says that it is good. Any ideas?


Will not crank how ? When you turn the key to the start position does the starter engage and spin the engine ? , A crank no start condition . Or nothing happens . A no crank - no start condition . I assume by your statement ( Had ignition control module tested ) That you have a crank no start condition . in which case have you tested input from the crank sensors to the ICM and PCM . What engine does your Old's have ? 3.8 L
Is there spark at the coil's ? Pull plug wires off of the same coil , have someone crank the engine over , Is there a spark jumping from one coil tower to the other ? If so , you don't have an ignition problem , fuel more then likely . Is your SECURITY light lit on the instrument cluster , if it has anti-theft .

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Car cranks but wont start? No spark. Changed ecm relay no help. Ignition harness is good. No fault codes. Battery is good. changed ignition relay, no help. I think its the ECM but need more info to spend...


Yes, the ECM is the last thing to replace after all other possibilities. No spark could be bad ignition coil, bad Ignition Control Module (controls the coil circuits for spark), bad plug wires, the crank and cam sensors (for ECM to determine spark timing).

Check the ICM -it can be tested at a parts store. If good, check the crank sensor.

Mar 16, 2015 | Cars & Trucks

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I have 88 chevrolet corsica. No spark at the plug wire put new coils / module on still no spark can the crankshaft position sensor stop it from getting spark and i checked all te fuses Bill


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It does use a crank sensor.
You would need to know that the ignition module and coils have battery voltage, then you would need a book to give you the test procedures for the computer and crank sensor.

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Could be bad coils,fuel filter and tune up.This is basic maintenance.I today change spark plugs on 3.8 .One was crack and some worn out.190000 km.

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It turns but it wont start,it has gas and power


Pull off the coil ignition cable at the distributor and check for spark coming out of coil when cranking engine over. Use a heavy rag or glove to hold the wire 1/4 inch from a metal ground. Should see a strong blue spark when cranking to verify ignition is good. If no spark, check for battery voltage to coil on the coil primary. If you have current to the coil, suspect a bad coil, ignition module, crank position sensor, or cam position sensor, or pcm. The coil, ignition module, and sensors can be tested before replacing.

Jan 29, 2013 | Cars & Trucks

1 Answer

Wont start, engine turns strong, new battery, new plug wires?? Thinking coils are bad???


take off one plug wire from one of the coils, turn starter and see if a spark jumps, you will be able to hear the sparks if you are by the door turning the key. if you get no sparks the ignition module is bad, if you do get spark try same test for remaining plug wires one at a time. you may have a bad coil

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The Jeep has set for about 6 months. A week ago: battery dead, jumped it but would not start. I replaced the coil, jumped it and it started instantly and ran better than it has in years. Yesterday, I...


Check to see if you have spark at the coil. If you have spark at the coil and no spark at the plug, you probably have a bad distributor cap and/or rotor.

If there is no spark at the coil, you need to find out if there is voltage present at the B+ terminal of the coil.
No B+ could be anything from a bad ASD relay to a broken wire or burned fusible link.

If B+ voltage is present at the coil, the "NO-SPARK" condition could be caused by anything from a bad Crankshaft Position Sensor (CKP) to a bad Ignition Control Module (ICM) To a bad Electronic Control Unit ((ECU) - AKA Engine Control Module)

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Before you change ECM, You must make sure you have spark from plugs..If not pull the distributer it tends to shatter internally which the eye cannot tell unless opened properly.

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check the voltage of the b+ terminal of the ignition coil (primary side) with a cheap multimeter while cranking. low voltage to the primary will cause low voltage on the secondary. also recheck all ground paths from the ignition module. ensure good connection from coil to module. note: new parts are not "known good parts" until it runs.--> IG.MOD.

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