Mechanics

WHY DO I HAVE NO SPARK WHILE CRANKING?

1990 Mitsubishi Mighty Max • 200,000 miles

2.4L Has no spark while cranking. Does have spark only after cranking and ignition switch is backed off to the "Run" position. Does not start in cold weather or after a cold night and has warmed up. When it does start, it runs great Main Relay has been replaced and clicks when cranking and backing off to run positon. Good: ecm, distributor cap&rotor, spark plugs&wires and coil
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Scottydp
November 2, 2011.




Check the ignition switch. There are two power sources to the ignition. In the start position, 12 volts is sent to the ignition switch for a hotter spark and help with cold starts. When you release the key to the run position, power goes through a resister to lower the voltage and protect the ignition system. It could be the computer, ignition switch.

The ignition switch has been replaced several times to no avail. The ECM is brand new and working fine. Is the power source the same for the start position 12V as the run position through a resistor for 8V? The igniton system is receiving no power through the start position and is receiving power through the run position. Possibly a broken connection(wire) to the start positon?
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Tiny
Scottydp
Nov 3, 2011.

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