Key turn buzz - Ford Powerstroke Diesel Forum
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post #1 of 5 Old 02-23-2012, 01:29 PM Thread Starter
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Key turn buzz

When I turn the key on to let the glow plugs warm up I get a buzzing under the hood. It's louder when the glow plug light is on then trails off. I usually wait until my insight comes up to crank it and the buzzing is done about that time. It's done this since I got the truck and I'm not sure exactly what it is...glow plugs? Injectors?

Anyway, it has always done this every time I turned the key. Over the last couple days, it hasn't done it when the engine is warm. Is this normal or something I should be worried about?

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post #2 of 5 Old 02-23-2012, 01:50 PM
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There are two noises that you should be hearing. One is your injectors clicking. Mine do it for (guessing) 5 seconds or maybe a bit longer if the truck is cold. The other noise that sounds more like a pump is the vacuum pump. Both of which are perfectly normal.

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post #3 of 5 Old 02-23-2012, 01:58 PM
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It's the injectors. Warming up the spool valves, or cycling them.
http://www.backglass.org/duncan/2003...ih_reflash.pdf

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post #4 of 5 Old 02-23-2012, 02:01 PM Thread Starter
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So, why isn't it doing it every time I turn the key now? It used to do it all the time

06 F350 Lariat
Edge Insight CS
Blue Spring Update, EGR Delete, STC update, Stand Pipes and Dummy Plugs, Turbo feed and drain tube update, Sinister coolant filter, New stock oil cooler, Zerex ELC, RiffRaff Boots, Isspro Fuel PSI, DC Alternator, ARP Studs, Heads from Jared, OEM Head Gaskets, Yukon Dura-Grip Posi
Warren 155cc/stock injectors
SCT with tunes from Vivian
Western 8-1/2ft Pro Plow with UltraMount
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post #5 of 5 Old 02-23-2012, 02:27 PM
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Quote:
Originally Posted by ParkCity.PSD View Post
So, why isn't it doing it every time I turn the key now? It used to do it all the time
That I don't know. I don't know enough about what's involved with pre-cycling or Inductive Heating.

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