Need Help to ID Strange Engine Noise
#1
Need Help to ID Strange Engine Noise
My mostly stock 12 Ultra Classic has a strange new noise. It has stock air intake, stock header with cat removed + Xied, and stock CVO SE mufflers. When the bike is at hot idle and I “blip” (rapid open) the throttle, I heard a strange single metallic crack or pop before the engine revs. The sounds reminds me of a metal on metal impact. Kind of like whacking your frame with a large screw driver or something similar. A couple of times it backfired after I did this. I installed the Xied right after I installed the cat-less header and it seemed to be running fine with no noticeable backfiring or decal popping.
Could this be a single loud ping of detonation? A crack of that sounds like metal on metal is a bit concerning. It only happens when I blip the throttle rapidly from a hot idle and it’s always a single crack or pop at the beginning.
Any ideas about what it might be?
Thanks
Could this be a single loud ping of detonation? A crack of that sounds like metal on metal is a bit concerning. It only happens when I blip the throttle rapidly from a hot idle and it’s always a single crack or pop at the beginning.
Any ideas about what it might be?
Thanks
#3
Keep listening till there's no mistake it's a ping then get back on here and we can help you from there, otherwise it's really tough to diagnose from where we are sitting. One thing for sure, if it's a ping it will get worse...believe me I know all about it and can help, so can a host of others.
#4
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#6
Forgot to mention mileage is only about 4K, so I'm not sure how much carbon build up there could be.
I'm familiar with what detonation sounds like, but that's usually a series of sounds. This is one single noise and louder than any detonation I've heard. I guess the smart thing to do would be to just take it to the shop since I'm still under warranty.
I'm familiar with what detonation sounds like, but that's usually a series of sounds. This is one single noise and louder than any detonation I've heard. I guess the smart thing to do would be to just take it to the shop since I'm still under warranty.
#7
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#8
I am starting to see a pattern. This is the third thread I have read with a weird noise on a 12 motor. All three threads are common to my issue...sound, milage and thoughts of source of noise. My motor is blown @ 4500miles. Mine started sounding like detonation under light accell, then sounds of a small ball pein hammer rapping on the rocker boxes under steady state of rpm 200miles later. Took it to a shop they could not duplicate. Changed oil noticed lots of metal. 200miles later it knocked once hot at idle to any rpm.
I hope this is not becomming a norm.
I hope this is not becomming a norm.
#9
I first heard my current noise a couple of nights ago. I was riding home under normal conditions and I heard the loud single pop. It was so loud, I actually thought something had broken or fallen off the bike. I immediately pulled over and inspected the bike as best as I could in the dark. Then I turned around and retraced my path to find whatever came off.
That night I equated the sound to metal snapping. I really thought something had broken and didn't ride it again until I looked it over thoroughly. Today I heard the noise again as I pulled the bike in the garage after a long ride. I finally realized I could reproduce the sound consistently by blipping the throttle.
That night I equated the sound to metal snapping. I really thought something had broken and didn't ride it again until I looked it over thoroughly. Today I heard the noise again as I pulled the bike in the garage after a long ride. I finally realized I could reproduce the sound consistently by blipping the throttle.
Last edited by ZenGlide; 07-28-2013 at 08:30 PM.
#10
I first heard my current noise a couple of nights ago. I was riding home under normal conditions and I heard the loud single pop. It was so loud, I actually thought something had broken or fallen off the bike. I immediately pulled over and inspected the bike as best as I could in the dark. Then I turned around and retraced my path to find whatever came off.
That night I equated the sound to metal snapping. I really thought something had broken and didn't ride it again until I looked it over thoroughly. Today I heard the noise again as I pulled the bike in the garage. I finally realized I could reproduce the sound by blipping the throttle.
That night I equated the sound to metal snapping. I really thought something had broken and didn't ride it again until I looked it over thoroughly. Today I heard the noise again as I pulled the bike in the garage. I finally realized I could reproduce the sound by blipping the throttle.
I suggest you do a good ride and pull your crank sensor or drop the oil and look for metal.