A humming nosie comes from the engine at idle after driving around for a few minutes. Its not there when I start it up, and when it is there, it goes away when I give it gas. For example, say im driving down to the store. It wont be there when I start it up, but will usually arrive at maybe the 2nd or 3rd traffic light after about 10 minutes of normal driving for reference when im stopped there at the light. Then I take off and it goes away. The noise isnt that crazy loud or chaotic sounding (no knocking, squealing, etc), but isn't really subtle either. Checked the alternator, steering pump, and fan clutch without the belt on and those pulleys and fan clutch all felt completely fine. (Although didn't have time to also take off the belt for smog though so i havent checked that yet.) Also, note that there have been no performance issues with the truck either, the noise just obviously means soemthings wrong, and is just flat out annoying as hell to be honest. Just wondering if you guys have any ideas seeing as many of you know way more than I do. Thanks.
Humming noise at idle after few minutes of driving?
- Thread starter Pavs323
- Start date
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It may not be connected but something I noticed is the difference between clutch engaged
and clutch not engaged but transmission in neutral. Which may happen to be the case during
your assessment of the noise.
It seems as though clutch engaged separates the clutch disc from the flywheel more
completely than just having the transmission in neutral...which is audible as just a low
level "scraping".
When you're starting it, I'm guessing you have the clutch pedal engaged but while idling,
you may just have it in neutral. Giving it gas generates a noise that overpowers the
slight scraping noise OR you have the clutch depressed as a safety while giving it throttle.
May not be the case, just offering a third person take...
and clutch not engaged but transmission in neutral. Which may happen to be the case during
your assessment of the noise.
It seems as though clutch engaged separates the clutch disc from the flywheel more
completely than just having the transmission in neutral...which is audible as just a low
level "scraping".
When you're starting it, I'm guessing you have the clutch pedal engaged but while idling,
you may just have it in neutral. Giving it gas generates a noise that overpowers the
slight scraping noise OR you have the clutch depressed as a safety while giving it throttle.
May not be the case, just offering a third person take...
- Thread starter
- #3
Just spent awhile cleaning all the pulleys and their contacts really well and now the noise is gone. Also found that one of my tensioners (of course the one I didnt have time to check earlier) was somewhat loose, so double checked to snug that one down this time. I run a gutted smog pump and every now and then junk from the ground flies up and gets lodged in there, making me think it had to do with that coupled with lost tension. Thank for the response though and if it comes back, ill keep it in mind for sure.
