How long do glow plugs stay on? - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 12-03-2007, 10:42 AM Thread Starter
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How long do glow plugs stay on?

ok, today its down to 19* outside, I was just curious if it is better to cycle the key a couple times to put some heat into the cylinders or is it more effective to leave them on? do the glow plugs stay on after the light goes out?

Early 99 F250 excab short bed 7.3psd, 6speed, diy intake, straight pipe exhaust, Egt, boost, and oil temp gauges, TS 6pos chip (soon to be with wildman tunes)
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post #2 of 5 Old 12-03-2007, 10:58 AM
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the glow plugs do stay on after the light goes out, the light just stays on until they come up to temperature
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post #3 of 5 Old 12-03-2007, 11:07 AM
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Turn the key on and leave it on for about 30 to 45 seconds after the light goes out,then start it. The glowplugs stay on till the cylinder gets up to temp which is usually a minute or so.
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post #4 of 5 Old 12-03-2007, 01:12 PM
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I set the timer on my watch for 1 minute and when I turn the key on I start my timer. then when it goes off, it fires right up.

My glow plugs have been known to stay of for a little over two minutes, I timed them once.

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post #5 of 5 Old 12-03-2007, 01:17 PM
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The "wait to start" light is independent of the actual glow plug on time. The PCM will turn the "wait to start" light on just for three to five seconds to allow sufficient cylinder temperatures to be reached for ease in starting. However, even though the light is off, the PCM will keep the glow plugs energized for a much longer time to reduce smoke and to improve cold driveability. The amount of on time can be as long as 180 seconds, and is determined by the PCM based on inputs from the barometric pressure sensor, the engine oil temperature sensor and available battery voltage.

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