Injector pre-cycle - Ford Powerstroke Diesel Forum
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post #1 of 10 Old 06-05-2011, 07:01 PM Thread Starter
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Injector pre-cycle

I read in the FICM guide that every time the key is turned on, the FICM initiates a injector pre-cycle. It states that the pre-cycle time varies with engine temperature. Anyone have any specifics on the time vs. temperature relationship? I'm asking because normally, when I turn my key on, I can usually hear the injectors buzzing for a short time. But there have been times when I didn't hear any buzz at all, and my truck didn't start. Of course there were a few times also when I didn't hear them buzz, but the truck did start. I'm not sure if that really meant anything or not, but with the intermittent problem I'm having, I'm trying to figure out what's normal and what's not.

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post #2 of 10 Old 06-05-2011, 08:06 PM
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I hear the injectors buzz every single time I start my truck. Cold or hot doesn't make a difference.
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post #3 of 10 Old 06-06-2011, 10:43 AM
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I am having the exact same problem. I hope someone that has injector precycling/inductive heating knowledge chims in.

When mine will not start, leaving the key on for about 5 minutes, then trying again, the injectors precycle and it starts everytime. Does this work for you too?
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post #4 of 10 Old 06-06-2011, 10:50 AM
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i wonder if when your not hearing the injectors if the ficm is sync'ing.
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post #5 of 10 Old 06-06-2011, 02:42 PM
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Now that its hot out, I don't seam to notice mine pre-cycle as much or as loud. This is a topic that need some expert input.
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post #6 of 10 Old 06-06-2011, 04:13 PM
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Sorry guys, but I was having the same issues and my ficm was bad. There should always be an injector buzz. My truck would not cycle when it was the first start of the day and I had to constantly use my block heater over night. The warmer your truck, the shorter the cycle, but it should always cycle the injectors. There is a company on ebay who will rebuild your ficm pretty cheap compared to new. They have a good waranty and pretty reliable, just search ford ficm module.
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post #7 of 10 Old 06-06-2011, 06:43 PM
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I wish it had been the FICM on mine... I was getting low voltage so I installed a Swamps 58V and still have the same problem.
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post #8 of 10 Old 06-07-2011, 10:40 PM
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Quote:
Originally Posted by diablos30 View Post
i wonder if when your not hearing the injectors if the ficm is sync'ing.
Is the FICM suppose to sync every time or does it only sync if it has for some reason lost communication?
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post #9 of 10 Old 12-09-2013, 11:17 AM
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i use to hear my cycle at every start up, be it in the desert at 112* or in the late night at 38*, im not hearing them cycle, i hear the vacuum pump, so the search continues for the correct answer. my starts, its never not started (excluding the stand pipe plug O ring failure) but its the way it starts, like some times its a quick ignite some times it rolls to light off. uggg
from what i have read, the only test seems to be a voltage test, yes?
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post #10 of 10 Old 12-09-2013, 07:36 PM
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The problem on mine ended up being a bad FICM relay in the main fuse box. Sometimes the relay gave the FICM juice and sometimes it didn't. The relay seems to be a pretty uncommon problem but you might check it anyway.
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