Weird cold idle - Ford Powerstroke Diesel Forum
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Old 11-30-2012, 07:54 PM
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Weird cold idle

I started having an issue with my idle when the truck is cold. It'll start just fine and idle just fine. I usually at least let the glow plugs go completely off before I touch the gas pedal. Well once I see the alternator gauge go up to normal range, and it's idling fine, it will start doing doing this weird fluctuation of about 100 rpms. At the same time the alternator gauge will start fluctuating too. The battery light does not come on. I installed a 215amp alternator a little bit ago. Other mods (back this summer): IDM mod and the 10k mod (c00nhunterjoe way). If the truck is really cold, once the glow plugs are off, I'll give it some gas and let it sit at like 1200 rpms for a few minutes to help it warm up more. Sometimes even while doing this I can hear a change in the sound of the engine and I can watch the alternator gauge fluctuate (the rpms don't fluctuate much when I'm hi-idling it). Hopefully my description makes sense. Any help will be appreciated. Thanks

Lee
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Old 11-30-2012, 09:58 PM
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That is your glow plugs. The sound you are hearing is the relay pulling a lot of amps from the alternator. It's perfectly normal. You glow plugs will cycle on and off for a little bit to make sure all cylinders are firing.
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Old 12-01-2012, 01:05 PM
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Oh wow... It was that dumb of a question?! Thanks for the info haha. Sorry
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Old 12-01-2012, 01:14 PM
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Hey dont be sorry I learned from your question. Thats what is great about this site. Never know what your gonna learn.
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