roar under hood
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Joined: Oct 2003
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roar under hood
Hello Fellow Ford guys,
I have a 1987 f150, 302 c.i. with auto transmission.
There is a loud roaring sound coming from the engine compartment seemingly from thr drivers side.
It does not do it at idle or even when revving it up sitting still. It happens when it is in gear and taking off from standstill and the roar continues as long as truck is moving with my foot on the gas pedal. If I let off the gas the roar stops. if I put the trans in neutral and coast the roar stops. It sounds like a propeller noise on an airplane and it sounds as if the engine is revving really high so I installed a tachometer and the rpms are normal so I know that the engine is not turning as fast as it sounds.
Any ideas?
Thanks for all replies.
I have a 1987 f150, 302 c.i. with auto transmission.
There is a loud roaring sound coming from the engine compartment seemingly from thr drivers side.
It does not do it at idle or even when revving it up sitting still. It happens when it is in gear and taking off from standstill and the roar continues as long as truck is moving with my foot on the gas pedal. If I let off the gas the roar stops. if I put the trans in neutral and coast the roar stops. It sounds like a propeller noise on an airplane and it sounds as if the engine is revving really high so I installed a tachometer and the rpms are normal so I know that the engine is not turning as fast as it sounds.
Any ideas?
Thanks for all replies.
Senior User
Joined: Sep 2003
Posts: 183
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From: Alberta
I had the same problem 3years ago 88 f-150 4x4 302. I replaced I can't really remember, but the fan has a pulley like the air conditionion kicks on and off when it needs to. Mine was shot, and stayed on sounded like a monster truck, or like you said an airplane. Anyways very load and anoying.
New User
Joined: Sep 2003
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Hello. New to this site, great site. I have this same roar, but only after I have been driving steady for a while at speeds about 60-70 mph. I drive to class which is about 30min from my house. It happens when I get into town and I slow down to stop and go traffic. It gets loud and it feels like it loses some power. Once I turn it off for a few minutes it goes away. What do you think? Thanks.
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Joined: Aug 2003
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May want to put the rear end up on stands so you can run it in gear to check for noises. Carefully of course, people get hurt doing this. Some vehicles you can get away with jacking one wheel, vehicles with posi and locked rear ends will drive away if you try this and demand that you jack both wheels.
I cured a fair amount of noise on mine by replacing the idler pulley. Stethoscopes and hoses can be good for isolating noises. Please post what you find.
I cured a fair amount of noise on mine by replacing the idler pulley. Stethoscopes and hoses can be good for isolating noises. Please post what you find.
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Senior User
Joined: Sep 2003
Posts: 265
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From: Northern Indiana
87f150v8
To check for a stuck clutch:
When the engine is cold, like first thing in the morning, grab the fan and see if you can turn it. It should turn fairly free with only a slight amount of friction. If the fan turns like that then the clutch is OK. If it's tight, then it's stuck.
ocanas2
That sounds normal. When you slow down, there is less air going thru the radiator even though the engine is still hot from running at highway speeds. The fan clutch engages to pull more air thru the radiator, and when that fan kicks in, you really can feel the difference in the engine power and it should roar, which tells you the fan is doing it's job.
To check for a stuck clutch:
When the engine is cold, like first thing in the morning, grab the fan and see if you can turn it. It should turn fairly free with only a slight amount of friction. If the fan turns like that then the clutch is OK. If it's tight, then it's stuck.
ocanas2
That sounds normal. When you slow down, there is less air going thru the radiator even though the engine is still hot from running at highway speeds. The fan clutch engages to pull more air thru the radiator, and when that fan kicks in, you really can feel the difference in the engine power and it should roar, which tells you the fan is doing it's job.
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