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  #11  
Old 06-10-2012, 10:06 AM
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N395V N395V is offline
 
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Quote:
have done some preliminary troubleshooting which "to me", would normally include checking pressures, making sure there are no obstructions,
I agree that blind internet troubleshooting is not optimal but when stumped posing the question to a broad audience may generate some not heretofore thought of options.

I was surprised when my filter clogged how many "builders" ,including
myself, and A&P/IAs where unaware of the filter.

Unfortunately early in the process of clogging fuel flow and fuel pressures were within normal limits.
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  #12  
Old 06-10-2012, 10:20 AM
F1R F1R is offline
 
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Default Check fuel vents for insects

Have a look inside the fuel vents
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  #13  
Old 06-10-2012, 10:43 AM
DocThrock DocThrock is offline
 
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Switched tanks. Checked flow. Changed mechanical pump. Checked vents. No flop tube. Airframe is an early 7a.

Based on everything we know so far it just about has to be firewall forward and fuel related. But I was not aware of a pre controller filter, nor morning sickness. Thank you all for the assistance. And we're still open to suggestions.

Last edited by DocThrock : 06-10-2012 at 10:46 AM.
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  #14  
Old 06-10-2012, 10:54 AM
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The LYCOMING stuck valve issue usually occurs after 600 hours, according to LYCOMING. I had this issue on an o360. It felt like the engine ws going to come off the mounts. Once cooled down everything was fine. After happening twice I used the service bulletin to address the issue. Here is the link. http://www.lycoming.com/support/publ...fs/SI1425a.pdf
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  #15  
Old 06-10-2012, 03:35 PM
DocThrock DocThrock is offline
 
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Just heard from our friendly A&P. He was aware of the fuel controller filter and cleaned and checked it, along with the the others. Evidently that's where he disconnected the fuel line and measured that the pump ( and the mechanical pump plugs out and using starter) would put out about 50 gallons an hour.

The pilot described the problem as an abrupt power loss, with the engine going to a low rough idle. Morning sickness or ??? can do that? And the pilot said the gauges all seemed to read normal???

The A&P is considering taking the spider off and sending it to Don for overhaul.
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  #16  
Old 06-10-2012, 05:13 PM
yakdriver yakdriver is offline
 
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Doc, Get the Airflow Performance manual out and look in the troubleshooting section. I still bet you have an air leak in the system. Don
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  #17  
Old 06-11-2012, 02:14 PM
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Sticking valve/morning sickness (which involves one cylinder 99.9% of he time) isn't going to take you idle, as described in the initial report.

As for Internet troubleshooting, if it's so questionable, then why does anyone read or post here in the first place? Obviously, you have to take things read here with a grain of salt and do your own cross checking. I had a nagging, chronic (minor) engine problem that went on for years solved with Internet troubleshooting. Sure am glad I asked!
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  #18  
Old 06-11-2012, 04:57 PM
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I misread the original post, I thought he pulled it it idle. I agree, a sticking valve would not cause the engine to go to idle.
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  #19  
Old 06-11-2012, 05:32 PM
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Quote:
Originally Posted by Low Pass View Post
As for Internet troubleshooting, if it's so questionable, then why does anyone read or post here in the first place? Obviously, you have to take things read here with a grain of salt and do your own cross checking. I had a nagging, chronic (minor) engine problem that went on for years solved with Internet troubleshooting. Sure am glad I asked!
Why do people post, because folks like to speculate on things and it's "fun" to try to guess whats wrong (anybody can do it, no experience required ).

However, troubleshooting is about solving a problem by going through a detailed step by step, logical, process of elimination.

About all the info given in the first post was my engine is cutting out and now I'm baffled, can you help. So I would suggest that if you are looking for good focused ideas then you need to provide very detailed information:

1) Specifics about the equipment involved (mags, FI or carb etc)
2) Recent work/repairs (when is the last time the plugs were cleaned for example)
2) How many hours on equipment (new low hour engine/ovh'd 3 times etc)
4) Exactly what things that have been done to try to solve the problem
5) Symptoms - did it start all of a sudden, getting worse, temp related etc.
6) Instrument readings such as EGT/CHT/fuel/oil/pressures/volts/amps etc.
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Last edited by Walt : 06-11-2012 at 05:36 PM.
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  #20  
Old 06-11-2012, 05:34 PM
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Quote:
Originally Posted by Bill.Peyton View Post
I misread the original post, I thought he pulled it it idle. I agree, a sticking valve would not cause the engine to go to idle.
To the unintiated though it may "feel" like it went to idle due to such a sudden loss of power.
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EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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