2001 Ford F-150 Soft high pitch sound

Tiny
LALISA
  • MEMBER
  • 2001 FORD F-150
  • V8
  • 4WD
  • AUTOMATIC
  • 113,000 MILES
My truck recently started to make a soft but high pitch reving sound when I initially start driving and accelerating. The sound is as it shifts automatically into each speed/gear until it hits about 35mph. I just had my transmission checked and flushed, etc, and everything else looks okay. Today my truck would not completely start up unless I hit the gas when turning key over. That only happened once and then it would start just fine. Per the mechanic, it could be the Idle Air Control or the corrosion on my battery that is making the starting up difficult. But, my battery being clean would not effect a high-pitched reving sound when starting to accelerate. The rest of the truck runs smoothly and no problems on the road. What do you think?
Wednesday, November 11th, 2009 AT 4:00 PM

5 Replies

Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Have you checked the fuel pressure? Especially at first start up?
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Friday, November 13th, 2009 AT 10:08 AM
Tiny
LALISA
  • MEMBER
  • 3 POSTS
How do I check the fuel pressure when starting my truck? The gages? (This is new to me). The sound has gotten significantly more noticable too in the last few days and starting up is not a problem, just the higher pitched noise of the engine running and accelerating. Also, I noticed last night that when driving, though smoothly, as I took my foot off gas going 55-60 mph on interstate, that it would paused/delay in down shifting. I figure I just need to take it to the Ford dealership now to get a real take on what is the problem. I just want an opinion before they tell me a novel of what I don't understand since my local mechanics had no clue. Thank you so much.
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Saturday, November 14th, 2009 AT 7:51 PM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok depending on where the noise is coming from depends on what it is. It could be an alternator or the power steering pump or a/c compressor. If the noise is more underneath or behind you when sitting in the truck, then it could be the fuel pump. You said it don't alway's like to start so that is why I asked about fuel pressure too. Now if you don't feel comfortable doing some checking or testing then take it in and get there diagnosis and then run it through me and I will put it in more laymens terms for you to help you understand what they are saying. Out of question is the check engine light on?
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Tuesday, November 17th, 2009 AT 9:42 AM
Tiny
LALISA
  • MEMBER
  • 3 POSTS
No, there is not a check engine light or anything else lit up to guide me where to go! That is why it is so irritating. The noise sounds like it is in front of me, kinda of on top of everything, if that makes sense. I was watching the RPMs today and it revs loudly mostly when getting up to 2 RPM for each gear it shifts into while speeding up. Then the sound goes away when it goes back down to 1 RPM and in gear. I asked the mechanic about the alternator previously and he said no. And they did a diagnostic and nothing came up. The starting problem went away after my battery was cleaned up so I think that was a seperate issue.
I will probably just have to take it to a dealership since the noise is not getting better and I don't want anything to break down or blow on me. Will let you know what they say and I appreciate you giving me a better idea of what it could be.
Thank you!
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Tuesday, November 17th, 2009 AT 10:14 AM
Tiny
RACEFAN966
  • MECHANIC
  • 5,029 POSTS
Ok what you can do is use a long screwdriver or automotive stethiscope and listen to the alternator and a/c compressor and power steering pump. Just simple raise the engine to the 2000 rpm (2 on the tach) and put the screwdriver on the part ie: alt and put the other end on your ear cupped with you hand and listen. Where the noise is the loudest that would be the culprit or possible source of your noise. Tell me what kind of noise is this? Is it a ticking type noise? What engine? And what is the prodution date on the drivers door? I will check TBS's to see if there is any bulletin's on the noise.
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Tuesday, November 17th, 2009 AT 10:28 AM

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