Odd surging when first started up.

[Justafordguy]

I have noticed an odd surging when I first start driving the truck in the morning. If I am moving along at a steady slow speed (aboout 1000 rpm) the engine will drop back to idle for a few seconds and then rev back to 1000. It does this for the first few minutes and then it's fine. It's a 2012, 200 miles on it, all stock except Magnaflow cat back exhaust. Any ideas?

 

[BIRDMAN]

not sure if its the same thing but when I start my truck in the morning it definitely idles higher until it warms up a bit then it slowly returns to 700rpm or so

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[Humvee21]

Sounds normal to me

 

[Justafordguy]

This is after it idles back to about 500rpms. I put it in gear and start moving down my long driveway. I hold it at about 1000rpms and it just drops back to 500 for a few seconds and then back to 1000. The truck speeds up and slows down as I go down the driveway. After a few minutes it will stay at 1000rpms just fine.

 

[Humvee21]

Does yours do this every cold start? Mine only does it once in a while

 

[Wilson]

well your practically idling in the manual it says to just drive it and not worry about more than a second or two of worm up time the climate I live in in the winter it can get to 20 below easily I let it worm up more than. this is a big engine with lots of power so you notice the reving all engine's do it just not to the existent of the 6.2 truck.

 

[Justafordguy]

It only does it the first time I start it in the morning. If I let it idle it stays right at 500 but if I try to hold it at 1000 it keeps dropping back to 500 and then back to 1000, over and over again. If I hold it over 1500 it will stay.

 

[Humvee21]

I retract my first statement. It does not seem I am experiencing the same thing you are. When I cold start the truck and try to drive off immediately, first gear will be sticky meaning that first gear is held for a long time (not sure what rpm) but once it starts to warm up it's fine for me.

 

[RatedSVT]

not sure if its the same thing but when I start my truck in the morning it definitely idles higher until it warms up a bit then it slowly returns to 700rpm or so

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This is all I get too......Justafordguy have you asked Ford about your concern?

 

[Dane]

My 2012 does not do this. I want to say it idles a little high when first starting if I leave it sitting (auto-choke type thing?), but it doesn't mess around with it once I'm driving - even if I start driving immediately.