Pre-Power Stroke Diesel (7.3L IDI & 6.9L) Diesel Topics Only

Glow plugs Still cycling when engine is warm ?

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Old 02-02-2019, 10:44 AM
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Glow plugs Still cycling when engine is warm ?

Hi, I'm wondering what to look for to fix this. The truck used to only cycle glow plugs on cold starts, and not cycle when warm.Now they cycle every start up.
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Old 02-02-2019, 01:06 PM
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The controller gets power with the key on in all cases. It should cycle(very quickly) before, during and for a few seconds after startup in all conditions.

All my 7.3-style controllers did this, and my understanding is it was by design - to reduce smoke after startup.
 
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Old 02-02-2019, 01:38 PM
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Cool !! Thanks!!
 
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Old 02-02-2019, 06:02 PM
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All systems normal.This is known as "after glow" and the reason the controller does this for a few seconds after the wait to start light goes off,is to help aid in a smoother running cold engine and reduces white smoke on startup.This short on/off cycling of your glow plugs is your friend.
 
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Old 02-03-2019, 06:45 AM
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once engine temps reach around 100 degrees, the glow plugs will turn off.
 
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