Loud Whining Noise
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Loud Whining Noise
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I have a 80 F-150 with I6. For the last few months the truck makes a loud whining noise about 3 minutes after it is started and it will continue to make the noise for about 20 minutes then it stops. (Seems to start with the thermostat opening) The noise is louder at an idle, as you speed up the noise fades, then when you let off the gas it is back louder than ever. The truck is running fine, it is just an annoyance. I thought it may be the EGR, so I took it off and capped it. Next I thought it may be my vacuum port next to my thermostat, I replaced it again not the problem, Thought it may be the water pump, again not the case. The sounds seems to be near the front passenger side of the motor. I don't believe it is a bearing in my AC or alternator, because the sound does not start immediately and it does not last. <o></o>
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Any help would be great!<o></o>
fficeffice" /><o></o><o
></o>I have a 80 F-150 with I6. For the last few months the truck makes a loud whining noise about 3 minutes after it is started and it will continue to make the noise for about 20 minutes then it stops. (Seems to start with the thermostat opening) The noise is louder at an idle, as you speed up the noise fades, then when you let off the gas it is back louder than ever. The truck is running fine, it is just an annoyance. I thought it may be the EGR, so I took it off and capped it. Next I thought it may be my vacuum port next to my thermostat, I replaced it again not the problem, Thought it may be the water pump, again not the case. The sounds seems to be near the front passenger side of the motor. I don't believe it is a bearing in my AC or alternator, because the sound does not start immediately and it does not last. <o
></o><o
></o>Any help would be great!<o
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Joined: Jun 2002
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From: redding U.S.A.
I'm pretty sure the 1980 has a smog pump in the same position as my 95. Its low passenger side on the accessory belt. These things can make quite a racket when they go out. Do some poking around and see if you can isolate the noise.
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Thanks for the advise on the PVC, I picked one up on my way home last night, replaced it and still didn't fix the problem.
The smog pump is my next target. Since my truck does not need emissions testing I am going to take off the belt and see what happens. My 80 smog pump is located above the power steering pump on the drivers side, however everything else for the smog is on the passenger side. May be the culprit.
Thanks for the advise. I will let you know what I find. My pick-up is usually very easy to work on, for some reason I cannot pinpoint this annoying noise.
The smog pump is my next target. Since my truck does not need emissions testing I am going to take off the belt and see what happens. My 80 smog pump is located above the power steering pump on the drivers side, however everything else for the smog is on the passenger side. May be the culprit.
Thanks for the advise. I will let you know what I find. My pick-up is usually very easy to work on, for some reason I cannot pinpoint this annoying noise.
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Thanks for the advise but I don't think it is the Power Steering Pump. The noise is definitely coming from the passenger side of the motor and my PS Pump is on the drivers side. Another strange thing about the noise is it does not seem to whine as long or if at all if the temperature outside is above 85 degrees? I guess I should move to Arizona.
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Update: The whining noise is starting to last longer and even at higher ambient temperatures. I am starting to have a sneaking sensation it may be my alternator, does anyone know how I could determine if it is my alternator? It is still putting out around 13 to 14 V, however the sound does sound like it may be coming from around the area my alternator is mounted. I would like to just take off the belt, but then everything will be belt less.
Some one also told me not to rule out my intake manifold, however I am not sure if my manifold would make such a noise. Any ideas? I am still searching.
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Some one also told me not to rule out my intake manifold, however I am not sure if my manifold would make such a noise. Any ideas? I am still searching.
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Senior User
Joined: Nov 2003
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From: Central Virginia
Pick up a mechanic’s stethoscope at an auto parts store. They are inexpensive good tools for quickly locating the source of engine noises. Please let us know what the problem turns out to be.
Posting Guru
Joined: Jun 2002
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From: redding U.S.A.
while you're in there-
The throttle body gasket gets sucked in and causes a vacuum leak, very common on the 300 due to the skimpy gasket thats in there. I think the felpro gasket is thicker. Smoothed my idle out quite a bit.
good to hear you found the problem.
The throttle body gasket gets sucked in and causes a vacuum leak, very common on the 300 due to the skimpy gasket thats in there. I think the felpro gasket is thicker. Smoothed my idle out quite a bit.
good to hear you found the problem.
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Joined: Nov 2003
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From: Kalispell, MT
he won't have a throttle body gasket on an 1980 I-6...because they didn't go to EFI until like 87...and i've never had a problem with any gaskets (other than my exhaust donut at the end of the exhaust manifold) being sucked in...
just somethin to point out...
MontanaFord
p.s. 94...where'bouts in montana are u located?
just somethin to point out...
MontanaFord
p.s. 94...where'bouts in montana are u located?
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