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12-23-2017, 07:05 PM
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Join Date: May 2006
Location: Sammamish, WA
Posts: 654
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I went flying today and did not get any misfires. So one of the several things that I did has fixed the problem. It would be nice to know which one, but that would have taken awhile.
As a recap here's what I did:
? Replaced the auto spark plugs with the screw terminal top with solid top.
? Cleaned out metallic remnants from the aviation plugs.
? Rerouted the mag plugs wires so they do not cross with the auto plug wires.
? Reseated all the auto plug wire terminal connections.
? Rechecked mag and e-mag timing, but did not change.
Thanks for the help!
Michael-
__________________
Michael Burbidge
Sammamish, WA
RV-14A Empennage
RV-9A Flying?340 hours!
Last Donation: December 2019
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12-24-2017, 04:40 AM
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Join Date: Mar 2008
Location: Clarksboro, NJ
Posts: 829
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My vote is #3. My understanding is that Pmags run so well that you can't really tell when the aviation plugs are not firing. Try a mag check at altitude to see if it replicates your issue under the same condition.
Glad it seems to be fixed!
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12-26-2017, 10:08 AM
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Join Date: Mar 2010
Location: VanAire, Co
Posts: 25
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Not knowing your wx conditions, I may be way off base.
Low power cruise followed by full power.
With that said, your description sounds like you swallowed a small piece of ICE.
I also wonder if you were cruising at a very lean and low power setting, and then went full power, and climbed. This can cause an unnerving crackle.
You can do this during run-up too. Lean to LOP at 1700/1800, then forget to enrich the mixture and go to full power for take off.
Snap Crackle Pop.
Good luck
Joel
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12-26-2017, 11:30 AM
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Join Date: Jan 2005
Location: Louisville, Ga
Posts: 7,840
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Your mixture gets quite a bit richer as you climb but you can't see it with steam gauges. I have a Dynon EMS and keep leaning to the same egt as on takeoff.
I was amazed at how much you can lean. Your plugs may be fouling from an over-rich condition.
On my T-6, if I didn't lean, by 3,000' it would start misfiring like crazy until and old T-6 instructor pointed that out to me.
Best,
__________________
Pierre Smith
RV-10, 510 TT
RV6A (Sojourner) 180 HP, Catto 3 Bl (502Hrs), gone...and already missed
Air Tractor AT 502B PT 6-15 Sold
Air Tractor 402 PT-6-20 Sold
EAA Flight Advisor/CFI/Tech Counselor
Louisville, Ga
It's never skill or craftsmanship that completes airplanes, it's the will to do so,
Patrick Kenny, EAA 275132
Dues gladly paid!
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12-26-2017, 12:09 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Dumb question, are you starting on?
1. P-mag
2. Slick Mag
3. Both
You may have answered this, but I have missed it.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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12-26-2017, 12:27 PM
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Join Date: May 2006
Location: Sammamish, WA
Posts: 654
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Joel, I was cruising a full rich, about 2500 feet, low-medium power setting. It was a clear day, about 32 degrees at 2500.
Bill, Start on p-mag only.
Michael-
__________________
Michael Burbidge
Sammamish, WA
RV-14A Empennage
RV-9A Flying?340 hours!
Last Donation: December 2019
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12-26-2017, 01:15 PM
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Join Date: Nov 2009
Location: Anchorage, Alaska
Posts: 457
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Plugs and or wires
I had this happen before. Everything normal but flying along in cruise just felt a slight stumble of the engine. Passenger couldn't feel it but I know my plane. Since I was headed to a remote place in Western Alaska I decided to turn around and have mechanic look at it...took a lot of looking but found an intermittent fault on one plug wire. Replaced them all and never encountered issue again. It's usually the simple things...
__________________
Burke Wick
Flying RV 8
Anchorage, Alaska
VAF Dues Paid for 2020
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12-26-2017, 01:38 PM
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Join Date: Jan 2005
Location: SC
Posts: 12,887
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Quote:
Originally Posted by Michael Burbidge
Joel, I was cruising a full rich, about 2500 feet, low-medium power setting. It was a clear day, about 32 degrees at 2500.
Bill, Start on p-mag only.
Michael-
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It is good that you are starting on the P-mag.
Burke has some good advice.
One of our first EIC customer called to tell us he had an intermittent stumble and we weren’t sure if it was the EIC or his ignition.
That customer was great and went through a bunch of tests for us.
Then one day, he felt it stumble and noticed that one of the coil pack condition bar graphs was dipping during the stumble and coming back up.
It turns out he had recently replaced his prop governor and didn’t secure the plug wires. When he pulled the cowl, he found one if his plug wires touching the engine mount and he could see a small mark where the spark energy was shorting through the wire to the engine mount. He moved his wire away from the mount and the problem went away.
Good luck solving this one. Feel free to give me a call, if you want to talk it over.
__________________
Bill R.
RV-9 (Yes, it's a dragon tail)
O-360 w/ dual P-mags
Build the plane you want, not the plane others want you to build!
SC86 - Easley, SC
www.repucci.com/bill/baf.html
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