Ignition Coil starting voltage
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08-15-2015, 09:34 AM
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Location: Rock Springs, WY
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Ignition Coil starting voltage
1991 F-250 5.8 EFI w/TFI-IV ignition system.
Ignition coil is not receiving a full 12V at start-up. Engine started and ran yesterday after boosting the coil with 12V to start. Check Engine light came on within the first minute of idling. Previously we kick started it by crossing the posts on the starter relay.
With a spark plug test light on the ignition coil wire, light only illuminates as the ignition is turned off.
I am guessing a sensor is stealing all available power as the key is turned on.
Next step is to go through each sensor connection.
Any ideas would be appreciated.
Ignition coil is not receiving a full 12V at start-up. Engine started and ran yesterday after boosting the coil with 12V to start. Check Engine light came on within the first minute of idling. Previously we kick started it by crossing the posts on the starter relay.
With a spark plug test light on the ignition coil wire, light only illuminates as the ignition is turned off.
I am guessing a sensor is stealing all available power as the key is turned on.
Next step is to go through each sensor connection.
Any ideas would be appreciated.
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