Idle low then high
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Elder User
Joined: Jun 2007
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Idle low then high
Truck just started doing this tonight. I ran the truck about all day pulling a trailer, truck ran fine. Then tonight once I got home I hooked on my snow plow to changed oil in it. Trucked idled 10 mins while I messed around with the plow, then when I went to unhook it, I noticed the rpms would go way down then back up to 1200ish. It kept doing that until I shut the truck off.
When the rpms go up and down it does it slowly, its not like a lope idle. I didn't have time to check anything out tonight, but any ideas what would cause this? truck ran great all day.
When the rpms go up and down it does it slowly, its not like a lope idle. I didn't have time to check anything out tonight, but any ideas what would cause this? truck ran great all day.
Post Fiend
Joined: May 2009
Posts: 5,470
Likes: 3
From: Pea Ridge, AR
Were you getting a SES light, or have any codes stored?
Depending on temps, the PCM does command a high idle and once parameters are met it will return to normal, you should have been able to overcome that though by tapping the brake or accelerator pedal. Definitely an interesting issue.
Depending on temps, the PCM does command a high idle and once parameters are met it will return to normal, you should have been able to overcome that though by tapping the brake or accelerator pedal. Definitely an interesting issue.
Thread Starter
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Elder User
Joined: Jun 2007
Posts: 570
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Were you getting a SES light, or have any codes stored?
Depending on temps, the PCM does command a high idle and once parameters are met it will return to normal, you should have been able to overcome that though by tapping the brake or accelerator pedal. Definitely an interesting issue.
Depending on temps, the PCM does command a high idle and once parameters are met it will return to normal, you should have been able to overcome that though by tapping the brake or accelerator pedal. Definitely an interesting issue.
No SES light, I'll check codes today. I tapped the brake pedal when I took the truck out of park, didn't change a thing.
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