Rough acceleration - Ranger-Forums - The Ultimate Ford Ranger Resource


2.3L & 2.5L I4 Tech General discussion of 2.3L and 2.5L I4 Ford Ranger engines.

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Old 10-06-2008
Redbeard90's Avatar
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Rough acceleration

When taking off and going through the gears the engine runs kind of rough until it reaches a certain rpm then smooths out. It will also smooth out if I floor it while it is rough. I changed the plugs and fuel filter,but not the wires yet. Any ideas? Could it be the throttle position switch?

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Old 10-06-2008
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maybe you didnt change the plugs right i didnt and had the same thing happen... your lucky you only have 4 plugs -.- ive got 8.
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Old 10-06-2008
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Mine has 8 also. It was doing it before I changed them. Before I changed them, It would barely pull itself on the highway. I also changed the O2 sensor. Here's what the old plugs looked like. Driver side on the right. #1 cylinder closest to the camera. It's not the best picture but you get an idea
of why it ran so badly.

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Old 10-06-2008
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Those look horrible!!
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Old 10-06-2008
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Should use copper plugs ... it will last longer.
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