Engine making high pitch whine...

[William Sigmon]

Sounds like a belt or pulley. Whine increases when throttle is applied. Any thoughts or suggestions.

 

[BWL]

I have a whine right now that gets way louder when hard on the throttle and then tapers off as I rev down. Reminds me of a supercharger whine or a turbo with a bad bearing. I have neither so maybe fan clutch?

 

[Marley]

Belt or pulley.....unless ofcourse you have a cold air intake.

 

[BWL]

No it's stock. Just cracked the 4k km mark on it. I just noticed it yesterday and with the fleet of hemi rams around here I know it's not a normal noise.

 

[tidefan1967]

Sounds like the bearing in the belt tensioner is shot to me. Take off the belt and spin it and you should know pretty quick.

 

[Fitz-0518]

^Agree, suspect serpentine tension-er and/or the other pulley followers. Easy relatively inexpensive fix.

 

[BWL]

I'll give that a shot. Still lots of warranty on this truck so at least it wont cost anything. I prefer to know whats wrong before I bring it in so if I get an it's normal I can argue till it's fixed.

 

[BWL]

Well its not a bearing off the pulleys as it doesn't do it out of gear. Gets quiet after 70 km/h. Foot to the floor from 0-70 and it whines until then or I let off the throttle and it sounds like it spools down till quiet pretty quick. Another good comparison is the noise a manual transmission makes when you reverse fast. Seems to be ok when I first start driving and then gets loud after I've driven for maybe 15 minutes.

 

[512RAM]

Did you ever figure out what it was?

 

[BWL]

Did you ever figure out what it was?

Not yet. It still does it, but it seems to not do it until I've been driving for a while. Trucks in the garage for the week. Will try to narrow down the cause of this, my water leak and the air suspension lowering a little overnight when I get home again. Then off to the dealer it will go. A pain becausr the air has to sit overnight to see that it dropped, but the whine requires a good drive to get it going so getting them both faulted on the same trip may be difficylt. The leak I just have to keep soaking spots so I know what it is. If its the 3rd brake I'll fix it if its anything else I'll get the dealer to do that too.

 

[512RAM]

I was curious because I had mentioned to several people, mine sounds like it had a supercharger whine. Almost like an old Ford power steering pump running dry.

 

[BWL]

I was curious because I had mentioned to several people, mine sounds like it had a supercharger whine. Almost like an old Ford power steering pump running dry.

Mine had a transmission leak and they had to replace the pan so I'm a little concerned something got messed up then or 1 problem led to the other. Thes transmissions are a real pain to check fluid level on though. Wtf is wrong with a dipstick?

 

[chrisbh17]

Mine had a transmission leak and they had to replace the pan so I'm a little concerned something got messed up then or 1 problem led to the other. Thes transmissions are a real pain to check fluid level on though. Wtf is wrong with a dipstick?

Sorry to bring a thread back from the dead, but did this noise ever get resolved? I think I have something similar going on in my truck, started recently.

 

[BWL]

Sorry to bring a thread back from the dead, but did this noise ever get resolved? I think I have something similar going on in my truck, started recently.

Still making the noise intermittently. Still unresolved.

 

[chrisbh17]

Still making the noise intermittently. Still unresolved.

That sucks.

The trans in mine has never been touched, but I too am paranoid that might be what it is. Either incorrect fluid level from the factory or something internal.

I know that they do not touch the trans as it comes from ZF, it just gets put into the drivetrain. Seems silly to have that much faith in the supplier that they got the fluid level correct, etc. without at least checking it. Makes you wonder if anyone ever got an underfilled, overfilled or internally broken one from the start.

 

[BWL]

That sucks.

The trans in mine has never been touched, but I too am paranoid that might be what it is. Either incorrect fluid level from the factory or something internal.

I know that they do not touch the trans as it comes from ZF, it just gets put into the drivetrain. Seems silly to have that much faith in the supplier that they got the fluid level correct, etc. without at least checking it. Makes you wonder if anyone ever got an underfilled, overfilled or internally broken one from the start.

The dealer includes fluid level check and top up with an oil change, but somehow I doubt they check the zf given how complicated the procedure is.

 

[chrisbh17]

Was thinking...is it possible its the mechanical cooling fan? Since yours (and mine) seem to start after the truck has been driven a while, so its up to temperature.

 

[BWL]

Well my truck is at the dealer now. Took it in for an oil change yesterday and they noticed the trans was leaking again. My intermittent power lock problem they figure is a problem with a sensor on the lock actuator that tells the truck what position its in. The whine is coming from the trans and they figure it may be related to the leaking valve body not engaging the gears properly. Its a non serviceable transmission so they have to remove the trans and send it to a specialist to determine the course of action so I'm in a rental for a while until it gets repaired. At least they got it to do most of the intermittent things while the mechanic had it so they can work to fix it.

 

[chrisbh17]

Good luck, sounds like a PITA!

Mine seems to be something with the A/C, not the trans. Once I turn off climate control (or when in manual mode, press the A/C button to turn off A/C), the noise goes away. Made an appointment for next Wed at my dealer, hopefully I dont hear "normal characteristic".

 

[BWL]

Good luck, sounds like a PITA!

Mine seems to be something with the A/C, not the trans. Once I turn off climate control (or when in manual mode, press the A/C button to turn off A/C), the noise goes away. Made an appointment for next Wed at my dealer, hopefully I dont hear "normal characteristic".

That sounds like a much simpler fix. I have a bit of time off right now so having the far more fuel efficient jeep wrangler to run around with is actually handy at the moment since I don't need a truck for at least the next week. Warranty covered so I'm just happy to get some of the intermittent problems fixed.