Help me diagnose a high RPM whine
#1
Help me diagnose a high RPM whine
The Excursion in my signature has developed a loud whine at high engine RPMs (>2500rpm). It sounds like turbo whine, but it is much louder, and has a bit of a metallic sound to it, but still very high pitched. It is somewhat intermittent above 2500rpm, but is becoming more common. Here's what I know about it:
1) Turbo has zero in/out play, and barely any side to side play.
2) Boost is as good as it ever was - 23psi common in 60h tunes - and is not affected when hearing the sound.
3) The whine will occur even during coasting downshifts that bring the RPMs up above 2500.
4) Serpentine belt was new in December, 2010, and is the OEM belt.
5) I replaced the idler pulley a month ago, as the old one seemed have a little play. The new OEM one has exactly the same amount of play, though, and the sound was not affected.
6) The sound appears to be coming from the driver's side of the engine compartment. Unfortunately, that's where both the 6637 intake and the alternator are.
7) Alternator was replaced in April, 2011, with one from Autozone.
Any ideas? As I mentioned, this is getting worse, and I need to get it figured out and resolved.
Mark
1) Turbo has zero in/out play, and barely any side to side play.
2) Boost is as good as it ever was - 23psi common in 60h tunes - and is not affected when hearing the sound.
3) The whine will occur even during coasting downshifts that bring the RPMs up above 2500.
4) Serpentine belt was new in December, 2010, and is the OEM belt.
5) I replaced the idler pulley a month ago, as the old one seemed have a little play. The new OEM one has exactly the same amount of play, though, and the sound was not affected.
6) The sound appears to be coming from the driver's side of the engine compartment. Unfortunately, that's where both the 6637 intake and the alternator are.
7) Alternator was replaced in April, 2011, with one from Autozone.
Any ideas? As I mentioned, this is getting worse, and I need to get it figured out and resolved.
Mark
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#5
That's what I'm afraid of. Got any great ideas as to how to replace the right thing the first time? The alternator and PS pump are so close together, I could never identify the sound source by location alone. Was your PS whine *really* high pitched? Its pulley is about the same size as the crank pulley, so I'd think it would whine at a lower pitch than the alternator, but perhaps not.
Mark
Mark
#7
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[quote=ScaldedDog;12303193]The Excursion in my signature has developed a loud whine at high engine RPMs (>2500rpm). It sounds like turbo whine, but it is much louder, and has a bit of a metallic sound to it, but still very high pitched. It is somewhat intermittent above 2500rpm, but is becoming more common. Here's what I know about it:
1) Turbo has zero in/out play, and barely any side to side play.
2) Boost is as good as it ever was - 23psi common in 60h tunes - and is not affected when hearing the sound.
3) The whine will occur even during coasting downshifts that bring the RPMs up above 2500.
4) Serpentine belt was new in December, 2010, and is the OEM belt.
5) I replaced the idler pulley a month ago, as the old one seemed have a little play. The new OEM one has exactly the same amount of play, though, and the sound was not affected.
6) The sound appears to be coming from the driver's side of the engine compartment. Unfortunately, that's where both the 6637 intake and the alternator are.
7) Alternator was replaced in April, 2011, with one from Autozone.
Any ideas? As I mentioned, this is getting worse, and I need to get it figured out and resolved.
Mine does it a little and I think it may be the power steering pump- Mike
1) Turbo has zero in/out play, and barely any side to side play.
2) Boost is as good as it ever was - 23psi common in 60h tunes - and is not affected when hearing the sound.
3) The whine will occur even during coasting downshifts that bring the RPMs up above 2500.
4) Serpentine belt was new in December, 2010, and is the OEM belt.
5) I replaced the idler pulley a month ago, as the old one seemed have a little play. The new OEM one has exactly the same amount of play, though, and the sound was not affected.
6) The sound appears to be coming from the driver's side of the engine compartment. Unfortunately, that's where both the 6637 intake and the alternator are.
7) Alternator was replaced in April, 2011, with one from Autozone.
Any ideas? As I mentioned, this is getting worse, and I need to get it figured out and resolved.
Mine does it a little and I think it may be the power steering pump- Mike
#12
I did, and sorry for not posting the fix years ago. The reman O'Reilly alternator had lost it's bearing cap in back, and the rear bearing failed. It was easy to see and feel with the belt off, but not easy, otherwise. A new alternator resolved the problem.
Mark
Mark
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My truck has a sounds that starts around 1900 rpm under load. Been chasing its, here's mine
https://youtu.be/smiRi63Kpfg
https://youtu.be/smiRi63Kpfg
Mark