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Old August 20th, 2014, 06:01 AM   #1
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Throttle Blip leads to Engine Knock

Hi all,

Maybe it's the heat, ethanol, oxygenated fuel, but a new thing has popped up with my 2700 mile '13 HS. If I'm crawling along waiting for traffic to move again or a light to change, and I blip the throttle to match revs to gear to start moving again (maybe in second because I'm still going 5mph and haven't stopped yet, because clutch-out while already moving in first gear is jerky), I'll hear a knock. Just one. Sounds like dieseling, only it's just the one knock followed by a rev drop then back on again. Once revs are up there's nothing unusual. Not sure I'm describing it right...

What do you think? Lean misfire or something like that?
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Old August 20th, 2014, 09:53 AM   #2
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Sounds like the CPU is sensing the knock and adjusting the timing. I never have this problem, as we can split lanes here...

One thing, though...are you using "top tier" premium fuel? Many smaller gas stations use a mix that does not have nearly as much of the detergent additives offered by the majors - that would be Chevron, Shell, Mobil, Texaco, 76, Costco and very recently Arco joined the party. There may be others in your area, you can check it online. This prevents deposits that can lead to pre-ignition.

BTW....You staying dry over there on the Wet Coast?
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Old August 20th, 2014, 08:48 PM   #3
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My Panigale does it, listened to it with the dealer and we came to the conclusion it was the slipper. Have 6k on my Hyper and I haven't noticed it...then again between the exhaust, earplugs, and old age I can't hear crap.

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Sounds like the CPU is sensing the knock and adjusting the timing. I never have this problem, as we can split lanes here...
Three weeks into our move to Vegas and I'm already looking forward to getting back to San Diego .
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Old August 21st, 2014, 01:28 PM   #4
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A Panigale and a Strada! I'm seriously jealous. Tell me you have a Diavel, too, and my head will explode.
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Old August 21st, 2014, 03:44 PM   #5
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A Panigale and a Strada! I'm seriously jealous. Tell me you have a Diavel, too, and my head will explode.
Haha, no Diavel. I told my wife no more bikes...and then they announce the Scrambler . Seriously though, getting older I keep eyeballing BMW for some longer riding.
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Old August 21st, 2014, 07:40 PM   #6
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I saw my first touring BMW when I was 21 years old and knew I would be riding one in my twilight years. I could easily go Goldwing, too.
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Old August 22nd, 2014, 06:50 AM   #7
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I was 27 when I bought my GoldWing in '93. I'd buy another now if I had time to use it for what it's meant for. Almost bought a used one before buying the HS. I'd probably never want a BMW tourer that doesn't have a boxer engine.

As for the knock, I don't think I can get the bike to make the noise on purpose, seems to happen spontaneously, and when hot. I'll see what happens as the weather cools.
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Old August 23rd, 2014, 01:51 PM   #8
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I was 27 when I bought my GoldWing in '93. I'd buy another now if I had time to use it for what it's meant for. Almost bought a used one before buying the HS. I'd probably never want a BMW tourer that doesn't have a boxer engine.

As for the knock, I don't think I can get the bike to make the noise on purpose, seems to happen spontaneously, and when hot. I'll see what happens as the weather cools.
When I got the Panigale, I was torn on the wet clutch. On one hand, I didn't have the claka-claka-claka anymore. One the other hand, I could hear how noisy the engines are. Toss in a slipper clutch and it's like a toddler on a drum set. Guys at MotoForza (thank you Jason )were patient with my "it's making a weird noise" and finally sent me out on a demo. Wasn't just my bike that was going to spontaneously grenade . Been more relaxed ever since.
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Old March 19th, 2015, 10:29 AM   #9
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Quote:
Originally Posted by NurseDaddy View Post
Hi all,

Maybe it's the heat, ethanol, oxygenated fuel, but a new thing has popped up with my 2700 mile '13 HS. If I'm crawling along waiting for traffic to move again or a light to change, and I blip the throttle to match revs to gear to start moving again (maybe in second because I'm still going 5mph and haven't stopped yet, because clutch-out while already moving in first gear is jerky), I'll hear a knock. Just one. Sounds like dieseling, only it's just the one knock followed by a rev drop then back on again. Once revs are up there's nothing unusual. Not sure I'm describing it right...

What do you think? Lean misfire or something like that?
Has anyone else noticed this? Had my 'strada for a month now and this issue has started in the last week - same fuel I've always used, nothing changed, engine wise. Just over 6,000 miles on the clock.

Not sure whether to take it to the dealer as it's reproducible once the bike is hot...

Last edited by Jokeshopbeard; March 19th, 2015 at 10:31 AM.
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Old March 19th, 2015, 12:35 PM   #10
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I saw my first touring BMW when I was 21 years old and knew I would be riding one in my twilight years. I could easily go Goldwing, too.
Men, do not go quietly into the night...
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