Loss of forward momentum at speeds above 70mph - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 05-18-2011
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Icon5 Loss of forward momentum at speeds above 70mph

Hello everyone. I'm new to the Forum and new to Ford as well. I recently bought a 2004 Ranger 4.0 liter 5 speed 4x4. I have noticed that while driving at speeds above 70mph the truck's forward momentum drops slightly. The tach does not flucuate, but I can feel the engine trip up for just a second. This issue does not happen continuous but randomly; I would say once every 30 seconds to once every few minutes. This issue occurs both with the AC on and off and does not happen at lower speeds or gears.

The truck was purchased used (obviously) from a dealer and I am uncertain as to the level of maintiance performed prior to my purchasing it, but they have assured me that the vehicle passed their multi-point inspection... yeah right. From what I can tell, the engine is stock and their are no after-market or mods.

I have spoken with another fellow Ranger owner and he has a similar issue. I just want some ideas as to what is causing this issue and how to fix it before I start replacing random parts. BTW, the truck as about 75K miles. Thanks for all your help.
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Old 05-18-2011
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change the spark plugs?
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Old 05-18-2011
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do a tune up. what happens if you drop into 4th does it still happen. what are your revs at that speed

Plugs
wires
air filter (K&N)
oil change
fuel filter
service trans lube
PCV
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Old 05-19-2011
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Dave, if I am in fourth or accelerating I do not have a problem. It only happens when I'm at a steady speed on the freeway. At 80 mph I am at 2800-2900 RPMs. Thanks for your help.
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Old 05-19-2011
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don't go 80 go 60 why go that fast
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Old 05-19-2011
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Make sure you have a good air filter with a good gasket NOT A K&N!!!! and make sure that the air box lid is properly latched.

Does it happen if the cruise control is set?
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Old 05-19-2011
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Ha ha... the speed limit is 75mph on that stretch of freeway.
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Old 05-24-2011
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I have a feeling that its the stock coil pack. I have thought about the demon coil pack with my thunder volt plug wires.... just a thought..... what does everyone else think?

Last edited by J's Ranger; 05-31-2011 at 01:28 PM.
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