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01-30-2018, 05:35 PM
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Super Moderator
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Join Date: May 2005
Location: Locust Grove, GA
Posts: 2,626
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Try some Marvel mystery oil in the oil and in the fuel.
Vic
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 Vic Syracuse
Built RV-4, RV-6, 2-RV-10's, RV-7A, RV-8, Prescott Pusher, Kitfox Model II, Kitfox Speedster, Kitfox 7 Super Sport, Just Superstol, DAR, A&P/IA, EAA Tech Counselor/Flight Advisor, CFII-ASMEL/ASES
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www.Baselegaviation.com
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01-30-2018, 06:18 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Quote:
Originally Posted by vic syracuse
Try some Marvel mystery oil in the oil and in the fuel.
Vic
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I think what Vic meant to say was you should perform a valve wobble test to determine if you have a sticky valve 
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Walt Aronow, DFW, TX (52F)
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01-30-2018, 07:37 PM
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Join Date: May 2017
Location: NE FL
Posts: 18
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TMX-360 Missing
The second solenoid was replaced today, bring the total to three since the aircraft was built. The solenoid was the problem and now, the low RPM missing has been resolved and confirmed with a lengthy ground and flight test.
This is the third solenoid on this aircraft and the second in a week to be replaced. One has to ask the question - how often do two solenoids fail? It is unusual, to say the least and brings about a question of whether there might be a culprit lurking in the electrical system, e.g., the alternator. Time will tell.
I hope that this experience might help others by encouraging ruling in/out a problem systematically (and with help) and NOT just replacing parts in an attempt to fix a symptom. Frustrating as it might be, investigate.
Thank all of you for all the help.
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Andy
2018 Dues Paid
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01-30-2018, 07:52 PM
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Join Date: Aug 2009
Location: Redding,Ca
Posts: 633
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What solenoid? You mean coil maybe?
I?m very curious to know how a solenoid could cause the engine to run rough....
Tim Andres
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01-30-2018, 08:28 PM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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He did say he has E-mags; IIRC the original version was dependent on ship's electrical power. So I'm guessing he's talking about the master solenoid.
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01-30-2018, 09:03 PM
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Join Date: Jul 2015
Location: Omaha, NE
Posts: 63
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Quote:
Originally Posted by N23WL
The second solenoid was replaced today, bring the total to three since the aircraft was built. The solenoid was the problem and now, the low RPM missing has been resolved and confirmed with a lengthy ground and flight test.
This is the third solenoid on this aircraft and the second in a week to be replaced. One has to ask the question - how often do two solenoids fail? It is unusual, to say the least and brings about a question of whether there might be a culprit lurking in the electrical system, e.g., the alternator. Time will tell.
I hope that this experience might help others by encouraging ruling in/out a problem systematically (and with help) and NOT just replacing parts in an attempt to fix a symptom. Frustrating as it might be, investigate.
Thank all of you for all the help.
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Do you have the surge protection diodes on the solenoid? Van?s has them.
Surge protection diode for Master Switch
Part Number = ES DIODE MASTER
Price = $11.00
Bob
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01-30-2018, 09:52 PM
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Join Date: May 2006
Location: Pocahontas MS
Posts: 3,884
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FWIW, you can make either of those protection diodes with a couple of ring terminals and a 1N400x (substitute any number between 2 & 9 for the x). Available everywhere, from Radio Shack to the best electronic supplier. Total cost, under a buck, after you buy the shrink tubing to go over it.
To the OP:
I'm late to this party, but your answer was hiding in your 1st post. You should see minimal voltage drop through your various connections and switches and/or relays/contactors. Over 1 1/2 volts of drop from battery terminal to buss says something is wrong, unless you have isolation diodes in the mix somewhere. And always use the negative battery post (not the terminal; the actual post) as reference when you're doing voltage measurements.
Charlie
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01-31-2018, 03:18 AM
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Join Date: May 2017
Location: NE FL
Posts: 18
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TMX-36 Missing
Hello,
I will try to respond to some comments but only with my limited experience and learned knowledge on the subject.
I used he Van's Master solenoid and yes, it is protected and torqued to spec. I could NOT put the solenoid in with the recommended downward position because of space limitations. There is no space without a major rewire and new conduit through the firewall. That may affect the life of the solenoid.
Since I am using Van's parts and have encountered a failure on the second of three solenoids, I am watching to see if I encountered a fluke (solenoid failure) or do I need to look at other sources of possible spikes or down graded current.
Marvel mystery oil. Absolutely. I used t it now as both a fuel & oil additive.
E-mags? yes
Further testing? Scheduled for a high orbit f/ 1-2 hour flight today and if there is any mention of a miss, I'll report.
Thanks so much.
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Andy
2018 Dues Paid
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01-31-2018, 05:36 AM
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Join Date: Mar 2014
Location: Alexandria VA
Posts: 305
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Is the engine just "missing" or is there also "popping" or "backfire" sound when you throttle back?
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01-31-2018, 11:35 AM
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Join Date: Feb 2010
Location: Gardnerville Nv.
Posts: 2,828
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These solenoids should last a long time unless.......you have a start relay in place of a hold relay-solenoid. one is for intermittent operation and one is designed to remain on continues duty...... 
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