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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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 .
Yes the cam sensor could fail to send a signal to the ignition module, but a V6 engine does not use a cam sensor. 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.
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.
Learning how to test a GM distributor less ignition system rather then guessing an replacing parts is the proper way to diagnose . Pulling a couple of pull wires of the same coil an having someone crank the engine over to see if there is spark would the first test . If there is no spark ,could be the ignition module , or the crankshaft postion sensor . GM 3 8L Ignition Control Module And Crank 3X 18X Sensor Test
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
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)
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.