Why is my 5.4L Triton roaring Off and on?

Asked by Montana_gal2 Jul 20, 2021 at 05:44 PM about the 2001 Ford F-150 Lariat Crew Cab 4WD SB

Question type: Maintenance & Repair

My 2001 F150 5.4L roars intermittently. It roars when I start it up until it
warms up. It roars off and on while driving down the hiway. And it roars more
often when the weather is hot. I lose a little power when it roars especially if I
am trying to accelerate at all. When it stops roaring and will smooth out, it is
nice and quiet with plenty of power. What in the world is causing this? Any
thoughts? I hope its just some solenoid or sensor!

5 Answers

F_O_R answered 3 years ago

Probably the fan clutch. This is normal.

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F_O_R answered 3 years ago

It is working normally. The clutch engages the fan when the engine needs more air flow.

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Montana_gal2 answered 3 years ago

So I just have to tolerate the loss of power? Sometimes the loss isn't to noticeable but other times it is bad when I am trying to get into traffic on the onramp!

Mark helpful

F_O_R answered 3 years ago

Service the cooling system and maybe the fan will engage less often. Without an operating fan your engine will overheat and die.

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