a nutless 4.0 - Ranger-Forums - The Ultimate Ford Ranger Resource


4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 05-11-2008
4.0ltwins's Avatar
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a nutless 4.0

i need help. my 4.0 has some srious performance problems. at 3800 and 4100 rpms it looses power and drops down. at the rev limit rather than pegging out it breaks apart any ides?
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Old 05-11-2008
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Auto or manual? What year of truck? When driving, or in neutral?
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Old 05-11-2008
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its a 99 automatic it only does the power loss when driving but it beaks up at the revlimit all the time
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Old 05-11-2008
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my 99 gmc sierra did something like that it was the fuel pump i would get you fuel pressure checked if i were you
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