Loping? Surging?

**Degnol** · #1 (**permalink**) 12-12-2010, 12:24 PM

It is in the low teens here today and the truck has started up just fine, even when not plugged in. When I drive it after a short warmup it does not hold rpm very well. Feels like I am jockeying the throttle. Does not do it at idle, just trying to maintain 35mph it surges up and down about 100rpm.
After a long highway run to full operating temps, it is less noticeable.

The truck has 50K, Banks intercooler and a Banks 6 Gun, but it does it on any of the settings. AIS intake and stock exhaust.

jesilvas · #2 (**permalink**) 12-12-2010, 12:34 PM

Fresh oil? More than likely just cause the oil is cold. That's why mine does it.

**Degnol** · #3 (**permalink**) 12-12-2010, 01:07 PM

Well, the oil is fresh, less than 500 miles, but I switched from Motorcraft to Fleetguard? I think. anyway it is blue

So that may make a difference.
Thanks

slcpunk74 · #4 (**permalink**) 12-16-2010, 01:22 AM

Mine just did this today and wouldnt stop doing it until I drove on the freeway for 3-5 miles then it was fine... Wtf?

jesilvas · #5 (**permalink**) 12-16-2010, 04:11 AM

EBPV might be closed. I think it's when it's under 2000 RPMs it'll stay closed until it's warm. Then above 2000 it opens.

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