Rough at low RPM - Ranger-Forums - The Ultimate Ford Ranger Resource


2.9L & 3.0L V6 Tech General discussion of 2.9L and 3.0L V6 Ford Ranger engines.

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Old 01-18-2012
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Join Date: Apr 2011
Location: Greenville, SC
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Rough at low RPM

02 Ranger Edge with 150,000 miles.

A few weeks ago my truck started idling rough. Not all the time, but at a light it would usually have a few rough patches. Then it started doing it while driving, but only at low RPM. Typically if I come down a hill at about 50 mph, and then start going up, it will hesitate. When it downshifts and the RPMs go up, it smooths out. Seems to have plenty of power at higher RPMs.

I've gone through two tanks of gas, and replaced the plugs (they were getting old anyway).

Yesterday I got a check engine light and a misfire on 1, but that's only happened once.

It's worse with the AC on.

Any ideas what's wrong?
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Old 01-18-2012
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Join Date: Dec 2010
Location: Lakewood, CO
Posts: 48
Sounds like you were kinda on track with the plugs -- suspect wires and or the coil-pack if they're not recent.
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