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Author Topic: Consistent ping  (Read 7055 times)

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HD Street Performance

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Re: Consistent ping
« Reply #15 on: October 03, 2020, 12:04:52 PM »

Next I would be looking for oil in the combustion and a motor health check, compression and leakdown
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rayson56

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Re: Consistent ping
« Reply #16 on: October 06, 2020, 11:23:27 AM »

Perform a compression test with the throttle open and disconnect the ACRs. I agree with the plan to data log for timing events. The m8 has knock sensors,  it is possible one or both can be bad.

If a knock sensor was bad wouldn't I have a check engine light on? This is the only code that I get every once in awhile.



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HD Street Performance

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Re: Consistent ping
« Reply #17 on: October 06, 2020, 01:10:16 PM »

That is an O2 sensor code. If there was a lean condition  it would ping. It takes a tech with skills and tools to get to the root cause, not a parts changer. The electrical diagnostic manual is very good for this.
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Fullsac Performance

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Re: Consistent ping
« Reply #18 on: October 10, 2020, 08:05:30 AM »

As mentioned above TTS Mastertune is and has been the tuner. And yes the ping is audible. Tuned by 3 different tech's, one of which was Steve from Fullsac. But thanks for your input.

Email me the map and I can pull a little timing from the problem area. I remember tuning this one. Something wasn't normal?

Steve@fullsac.com
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rayson56

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Re: Consistent ping
« Reply #19 on: October 10, 2020, 11:17:14 AM »

Thanks for reaching out Steve, that's why after 3 tuners, including you, I'm assuming that the problem is mechanical/physical and ultimately not in the tune. It seems timing has already been pulled to try to alleviate the problem but to no avail. I figure I'll need to take it to a shop and have it torn down to find the issue, just looking for ideas on where to start and to see if anyone here has run across this before.
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VANAMAL

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Re: Consistent ping
« Reply #20 on: October 10, 2020, 08:39:16 PM »

Ive seen then ping like crazy due to carbon build up also may be piston problem
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rayson56

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Re: Consistent ping
« Reply #21 on: October 10, 2020, 09:18:16 PM »

I appreciate the input.
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Pearl114

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Re: Consistent ping
« Reply #22 on: November 03, 2020, 04:44:21 PM »

I'm in Ca. same issue with the ping on my Street Glide Special 114 with Screaming Eagle stage II.  only 3k miles just got it in July, Dealer ship said they can't adjust Harley Map. Independent shop said they could only dial in at the 3K rpm and up.  He did say try octane booster, has anyone tried that and if so, a. did it work and b. what brand.  Thanks I'm new to the site.
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rayson56

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Re: Consistent ping
« Reply #23 on: November 03, 2020, 10:25:39 PM »

As far as what goes in your fuel tank it should be Premium (91) octane or above and NO octane boost, or so I've been told by those I trust.
I just dropped mine off to have it checked out in the morning. They are going to do a leak down and compression test and also use a bore scope to see if there are any internal issues, then we'll make game plan and move forward.
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Re: Consistent ping
« Reply #24 on: November 04, 2020, 12:46:30 PM »

Oil in the combustion reduces octane and causes detonation.
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rayson56

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Re: Consistent ping
« Reply #25 on: November 04, 2020, 02:22:24 PM »

Will a leak down or compression test tell if there is oil in the compression chamber? If not what will? TIA
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Re: Consistent ping
« Reply #26 on: November 04, 2020, 07:47:55 PM »

try venting crankcase to atmosphere or a catch can..... may be that simple..... or not  :nixweiss:
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rayson56

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Re: Consistent ping
« Reply #27 on: November 09, 2020, 11:43:49 AM »

Sooo, the leak down test was less than 20%, which is within Harley's spec's (Harley supposedly says up to 25% is acceptable on the 4 valve M8 especially with 40K. :-\), compression is 230 per cylinder, and bore scope apparently showed nothing out of the ordinary, so mechanically everything seemed to be within spec. Time to look elsewhere.
Checking the tune with my TTS Mastertune the young gamer tech named Wade (who is my new idol) found that the tables were way out of whack and went to work. Apparently there was a major lean spot at the rpm range in question and the adaptive fuel values were all over the place. He changed my plugs and rebuilt my entire main fuel table (which with TTS is no small feat and very time consuming apparently) while doing about 10 dyno pulls to get some great results. Then, after reading a thread on here, I had him upgrade my intake to the Screamin Eagle 55mm intake and 5.1mm injectors and re-tune it. He then took it out for a 35 mile real world ride and the chart below is what we ended up with doing 5th gear runs. So a big thanks once again for all of the great input from the members here.
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rayson56

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Re: Consistent ping
« Reply #28 on: November 09, 2020, 11:46:10 AM »

I took the bike out and rode a couple hundred miles and its working great!
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HD Street Performance

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Re: Consistent ping
« Reply #29 on: November 09, 2020, 12:25:20 PM »

What shop performed the work?
20-25% leakdown is the repair limit. This is a motor that is toast. Yours is not there with 230 compression readings.
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