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+--- Thread: Buzzing sound on startup and slow return to idle? (/showthread.php?tid=6065)
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Buzzing sound on startup and slow return to idle? - Wereignsupreme_imp - 05-26-2013
Hi all, I just bought a CB a week ago and I love it. However, two things cropped up today that I needed some help with, I don't know too much about motorcycles apart from youtube and searching other forums. Honestly my mind might just be playing tricks on me but it'd be great to hear from people that actually own the bike.
1) There is a strange buzzing sound coming from under the fuel tank when I turn the key to the on position. I hear the fuel pump turn on but then this buzz that seemed to be coming from the MAF/MAP sensor (not sure) connected to the airbox. I unplugged it and the buzz was still there so not sure where it's coming from. Maybe a servo motor or the solenoid? Or another sensor that I'm missing?
2) I let a buddy take the bike for a spin and when he brought it back, the idle seemed like it took longer to go back after revving it in neutral, like there was a vacuum leak or something. Posted a vid on youtube for someone to compare.
http://www.youtube.com/watch?v=Hh3wsR4xPeA&feature=youtu.be
3) Like jodyz post, I too am hearing something like a rattle/tinging from the front part of the engine near the headers. May have just not noticed it before my buddy drove it but still worries me.
Thanks for any help y'all can give me. I hope I'm just being a hypochondriac.
RE: Buzzing sound on startup and slow return to idle? - Guth_imp - 05-26-2013
I'd wait for others to post up before getting overly concerned. One thing to keep in mind is that with an air-cooled engine, I think you're bound to hear a few more mechanical noises than you might not otherwise hear with water flowing through the engine. Another thing is that the stock exhaust is so quiet on this bike that you're bound to hear more engine noises than you would otherwise. I thought that my stock Honda Hawk GT exhaust was quiet (it is) until I experienced by CB1100's exhaust note, so much of what we hear is relative.
That's not meant to downplay or dismiss any issues that you or others might be experiencing. Just something to keep in mind. Like yourself, I'll be keeping an eye on other's comments to threads such yours, as this community has a lot of combined mechanical knowledge that we can all benefit from.
RE: Buzzing sound on startup and slow return to idle? - Wereignsupreme_imp - 05-26-2013
Cool, thanks will keep it in mind! That sharp buzzing noise is strange though...
RE: Buzzing sound on startup and slow return to idle? - vfrpaul98_imp - 05-26-2013
(05-26-2013, 12:56 PM)Wereignsupreme_imp Wrote: Cool, thanks will keep it in mind! That sharp buzzing noise is strange though...2000 miles on mine your video sounds o.k. to me, slight whirring noise on rpm rundown is normal.
RE: Buzzing sound on startup and slow return to idle? - Deanohh_imp - 05-26-2013
I don't hear anything odd in the video.
when you turn on the key, a lot of things happen. Fuel pump, canister purge, and other things cycle and initialize to prepare the engine to run. The term buzz is too ambiguous to try to figure out. Get someone at a shop to listen to it.
also you'll hear some valve noise...your sitting right on top of them. Actually I like to hear it. Its the song of a healthy engine. You'll know it if they ever start to clatter wierdly
..it will sound like shaking marbles in a paint can.
RE: Buzzing sound on startup and slow return to idle? - Wereignsupreme_imp - 05-26-2013
Thanks all. I'm looking at a schematic now, the sensor that is making the sound is the purge control solenoid. When I take it in for maintenance I'll ask the tech to look at it.
RE: Buzzing sound on startup and slow return to idle? - Deanohh_imp - 05-26-2013
Does it buzz then stop or buzz all the time?
RE: Buzzing sound on startup and slow return to idle? - Wereignsupreme_imp - 05-26-2013
It buzzes for about a second then stops, right when the key is turned to "on". But the sound time duration is not uniform, it varies. Sometimes a little bit longer, sometimes a little shorter.
RE: Buzzing sound on startup and slow return to idle? - jodyz_imp - 05-26-2013
(05-26-2013, 11:29 AM)Wereignsupreme_imp Wrote: Hi all, I just bought a CB a week ago and I love it. However, two things cropped up today that I needed some help with, I don't know too much about motorcycles apart from youtube and searching other forums. Honestly my mind might just be playing tricks on me but it'd be great to hear from people that actually own the bike.
1) There is a strange buzzing sound coming from under the fuel tank when I turn the key to the on position. I hear the fuel pump turn on but then this buzz that seemed to be coming from the MAF/MAP sensor (not sure) connected to the airbox. I unplugged it and the buzz was still there so not sure where it's coming from. Maybe a servo motor or the solenoid? Or another sensor that I'm missing?
2) I let a buddy take the bike for a spin and when he brought it back, the idle seemed like it took longer to go back after revving it in neutral, like there was a vacuum leak or something. Posted a vid on youtube for someone to compare.
http://www.youtube.com/watch?v=Hh3wsR4xPeA&feature=youtu.be
3) Like jodyz post, I too am hearing something like a rattle/tinging from the front part of the engine near the headers. May have just not noticed it before my buddy drove it but still worries me.
Thanks for any help y'all can give me. I hope I'm just being a hypochondriac.
(05-26-2013, 12:26 PM)Guth_imp Wrote: I'd wait for others to post up before getting overly concerned. One thing to keep in mind is that with an air-cooled engine, I think you're bound to hear a few more mechanical noises than you might not otherwise hear with water flowing through the engine. Another thing is that the stock exhaust is so quiet on this bike that you're bound to hear more engine noises than you would otherwise. I thought that my stock Honda Hawk GT exhaust was quiet (it is) until I experienced by CB1100's exhaust note, so much of what we hear is relative.
That's not meant to downplay or dismiss any issues that you or others might be experiencing. Just something to keep in mind. Like yourself, I'll be keeping an eye on other's comments to threads such yours, as this community has a lot of combined mechanical knowledge that we can all benefit from.
I also have the "buzz", but chalked that up to all the whiz-bang EFI, fuel pump, other electrics required to operate. Never gave the buzz much thought after the first few starts.
As for the rattling, my advice is, not to wait. The service dept won't hear anything odd unless they spend time with the bike like you do, or it progresses to the point that mine has. Report the noise and get them to document each time you bring it in. I didn't have them document the rattling I've heard since day one, and I hope that doesn't work against me to get this issue resolved. Good luck.
RE: Buzzing sound on startup and slow return to idle? - Deanohh_imp - 05-26-2013
Must be defective. I'd suggest calling your warranty place to see how soon they can fix it. They may have to order part and then would have it by the time you take it in.
meanwhile you could just unplug it.