My glow plugs stay on in warm weather. - Ford Powerstroke Diesel Forum
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Old 11-17-2010, 11:00 AM
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My glow plugs stay on in warm weather.

I think the plugs are on for too long. No matter how hot the truck is, upon starting, the glow plugs will still come on for about one minute.

The time never varies. It's done this since I got the truck over a year ago.

My batteries are gettng weak and will only crank the engine for 10 - 15 seconds. I can charge the batteries overnight and it will then start.
The problem has gotten worse over the past 4 - 5 weeks.

The alternator is putting out 14.7 volts at around 900 RPMs.

Finally to the question: What sensor dictates how long the glow plugs stay on?
I think it may be bad.
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Old 11-17-2010, 12:08 PM
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The computer uses oil temperature to determine length of cycle,up to two minutes.Some of these guys have been known to intercept the signal wire with a switch and once it's running you simply depower the plugs,thus saving your plugs .I just did my plugs and relay and they do stay on for sometime,but it starts real well.
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Old 11-17-2010, 12:12 PM
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Thanks for the response Chop. I have contemplated doing that, probably in the spring.
Any idea where the oil temp sensor is?
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Old 11-18-2010, 06:58 AM
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Anyone know where the oil temp sensor is located or whatever sensor sets the glowplug time?
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Old 11-18-2010, 10:06 AM
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I would say do a full battery and alternator test on it. You should be able to crank as long as you want. Also check the cables and connections. 14.7v at idle sounds ok, but how many amps are there.
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Old 11-19-2010, 08:44 AM
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Anyone know what sensor the computer uses to say how long the glowplugs should stay on?
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Old 11-19-2010, 06:17 PM
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combonation of them
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