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Old 05-09-2008, 04:01 PM
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Wait to start?

My wait to start light comes on but it only stays on for like 3-5 seconds max. Even when its cold in the morning. What might this mean?
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Old 05-09-2008, 04:28 PM
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i dont know but my dads superduties stay on for like 10-20 seconds depending if theyre cold.
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Old 05-09-2008, 04:31 PM
Jon
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WTS

The wait to start light is completely independant of the glow plugs. The pcm will command the glow plugs on from anwhere between 2-120 seconds. If the pcm deemes it needed the relay stays on long after the wait to start light goes out.
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Old 05-12-2008, 06:52 PM
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The PCM uses the engine oil temp sensor (EOT) to determine wait-to-start time. Jon is correct that glow plugs will remain energized after the light goes out. You may be able to find some data as far as resistance-versus-tempurature so you can ohm out your sensor to see if it is at fault, or potentially a broken or shorted wire to the sensor may be at fault. If anyone has better ideas, I'm sure they'll chime in.
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