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wait to start light

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Old Nov 4, 2006 | 02:41 PM
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why165
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wait to start light

my light comes on and then when it goes out the glow plugs fire. what the ???? is going on?
 
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Old Nov 4, 2006 | 02:45 PM
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what do you mean by fire?like a poof? maybe you have an injector that leaks,so when glow plug gets hot it burns? just a thought..
 
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Old Nov 4, 2006 | 08:51 PM
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not on fire. when the wait to start light goes out then the glow plug relay starts its song and dance.
 
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Old Nov 4, 2006 | 09:50 PM
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Ok, when you first turn the key on the glow plugs continually burn for anywhere from 1-20 seconds then the wait light turns off and the glow plugs begin the "afterglow" cycle where the relay clicks on and off to keep the glow plugs at a certain temperature. They do that for about thirty seconds to keep the fuel burning until combustion heats the cylinders up.
 
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Old Nov 5, 2006 | 01:03 AM
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Originally Posted by spikebee
Ok, when you first turn the key on the glow plugs continually burn for anywhere from 1-20 seconds then the wait light turns off and the glow plugs begin the "afterglow" cycle where the relay clicks on and off to keep the glow plugs at a certain temperature. They do that for about thirty seconds to keep the fuel burning until combustion heats the cylinders up.
Actually I read that they can cycle on and off like that for up to 2 minutes...
 
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Old Nov 5, 2006 | 01:42 AM
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When mine is doing the cycling the Volt guage goes almost down to 8 volts.
Is this normal?
 
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Old Nov 5, 2006 | 07:16 AM
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When you turn the key 'on' the glow plugs heat up (10 - 12 sec ) lite goes out you fire up. The controller will cycle for +/-10 sec (volt meter will drop down to 6-8v - interior lite will dim etc). Then should be normal.
 
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Old Nov 5, 2006 | 07:36 AM
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Actually I read that they can cycle on and off like that for up to 2 minutes
Yes, that's true if you start the engine the glow plugs will continue the afterglow cycle while the engine is running for up to two minutes depending on the temperature. If you just turn the key on to watch the show, they will usually only run through a short cycle and that's why you need to start the engine right away or recycle the ignition.

When mine is doing the cycling the Volt guage goes almost down to 8 volts.
Is this normal?
Yes, if you have good glow plugs you will have quite a current draw. I've actually had people bring vehicles to the shop complaining of severe electrical problems because when they started their vehicle all of the lights were flickering and there was a clicking noise under the hood. But that's what happens when you have a fleet age that spans decades!
 
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Old Nov 5, 2006 | 11:33 AM
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Yes remember, the 6.9 is the great great grandfather of the 6.0 diesel they are selling today. As with all things it gets more complicated with every generation. Some things are better, some things are worse, but the two have little in common other than they both burn diesel fuel and don't have spark plugs.
 
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Old Nov 5, 2006 | 11:42 AM
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Amen, Dave, but I wanna go back to working on trucks like yours! I grow weary of abused, warranted 6.0l and hardly anybody will bring me a nice 6.9l or 7.3l IDI!
 
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Old Nov 5, 2006 | 12:18 PM
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i would, there is not a single ford dealership that will touch my truck for 100 miles. aint ford good to its customers. i was trying to get it dynamically timed just some i would know for sure that it was retarded 1 tooth. i need to fix that. but after many calls and a couple of trips to different dealers, nobody will even touch it. thank god i can do it myself, i just didnt want to.
 
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