Matronics Email Lists Forum Index Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
 
 Get Email Distribution Too!Get Email Distribution Too!    FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Lousy Idle

 
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Engines-List
View previous topic :: View next topic  
Author Message
dean.psiropoulos(at)veriz
Guest





PostPosted: Wed Dec 31, 2008 12:43 pm    Post subject: Lousy Idle Reply with quote

Anyone have a few words of wisdom for me:

I'm pulling my hair out over a crappy engine idle that I can't seem to tame.
The basic problem is that I'll start the engine and it fires right up and
runs at about 700-750 RPM just like the book says it should. But from
there, all it seems to want to do is gradually idle slower and slower as the
engine warms up until it barely runs (between 450-500 RPM) by the time I've
done all my checks and am ready to take the runway for takeoff.
The engine is a new Mattituck built TMX-IO360 Lycoming clone with Lightspeed
electronic ignition on one side and a magneto on the other. It also has
Airflow Performance fuel injection with purge valve, a Sterba wood prop and
Mark Landoll's 11 pound steel inertia ring bolted to the flywheel. The
configuration is updraft with the AFP fuel controller bolted to the bottom
of the sump (like carbureted engines) and uses Van's airbox. I've read the
AFP manual and talked to the tech there and adjusted the idle mixture and
stop numerous times but I can't seem to stabilize it. When I have the
cowling off, I make the adjustments and taxi around a bit to warm up the
engine and it seems to be ok. Then I'll put the cowling back on and the
symptoms seem to reappear. There isn't anything banging against the cowling
that I can see that would be causing trouble so I'm totally stumped!

Anyone else having this problem? I'm flying out of a long but narrow strip
with trees on three sides and no good places to land near the airport.
Needless to say it makes me nervous, even though the engine runs strong just
off idle and at full power. Thanks.

Dean Psiropoulos
RV-6A N197DM
4.1 hours


- The Matronics Engines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Engines-List
Back to top
rambud(at)windstream.net
Guest





PostPosted: Wed Dec 31, 2008 1:17 pm    Post subject: Lousy Idle Reply with quote

I am no expert by any means, and I would not claim to have all of the
answers. I had a somewhat similar problem in an old C-35 Bonanza that had
spent a lot of time in the AZ desert. The engine started great, ran
beautifully and we never had a problem with it when we flew. The problem
ALWAYS occurred after landing and roll-out. We would bring the throttle back
to idle and the engine would die. We tweaked the fuel pressure until it was
at the stop. Same thing. During the annual we finally discovered the
culprit: the fuel line from the aux tank (in the baggage compartment) to the
engine was filled with sand (remember it came from the desert).

You may want to check your fuel lines for some possible contaminant. While I
am sure you don't have any sand, you may find you have something that takes
time to travel through the system to cause your problem.

Alternatively, you say that it runs fine with the cowling off but you have
the same problem when you put the cowling back on. Perhaps there is some
sort of blockage in your induction system between the cowling (air filter)
and the airbox?

I know these things sound simple and you most likely have looked into them,
but in the event you have not, sometimes it is the most simple of things
that creates our problems.

Bud

--


- The Matronics Engines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Engines-List
Back to top
GrummanDude



Joined: 15 Jan 2006
Posts: 926
Location: Auburn, CA

PostPosted: Wed Dec 31, 2008 1:43 pm    Post subject: Lousy Idle Reply with quote

Call Ken Tunnell at LyCon

(559) 651-1070

Sent from my iPhone

On Dec 31, 2008, at 12:42 PM, "DEAN PSIROPOULOS" <dean.psiropoulos(at)verizon.net
> wrote:

Quote:

>

Anyone have a few words of wisdom for me:

I'm pulling my hair out over a crappy engine idle that I can't seem
to tame.
The basic problem is that I'll start the engine and it fires right
up and
runs at about 700-750 RPM just like the book says it should. But from
there, all it seems to want to do is gradually idle slower and
slower as the
engine warms up until it barely runs (between 450-500 RPM) by the
time I've
done all my checks and am ready to take the runway for takeoff.
The engine is a new Mattituck built TMX-IO360 Lycoming clone with
Lightspeed
electronic ignition on one side and a magneto on the other. It also
has
Airflow Performance fuel injection with purge valve, a Sterba wood
prop and
Mark Landoll's 11 pound steel inertia ring bolted to the flywheel.
The
configuration is updraft with the AFP fuel controller bolted to the
bottom
of the sump (like carbureted engines) and uses Van's airbox. I've
read the
AFP manual and talked to the tech there and adjusted the idle
mixture and
stop numerous times but I can't seem to stabilize it. When I have the
cowling off, I make the adjustments and taxi around a bit to warm up
the
engine and it seems to be ok. Then I'll put the cowling back on and
the
symptoms seem to reappear. There isn't anything banging against the
cowling
that I can see that would be causing trouble so I'm totally stumped!

Anyone else having this problem? I'm flying out of a long but narrow
strip
with trees on three sides and no good places to land near the airport.
Needless to say it makes me nervous, even though the engine runs
strong just
off idle and at full power. Thanks.

Dean Psiropoulos
RV-6A N197DM
4.1 hours



- The Matronics Engines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Engines-List

_________________
Gary
AuCountry Aviation
Home of Team Grumman
Back to top
View user's profile Send private message Send e-mail Visit poster's website
Kelly McMullen



Joined: 16 Apr 2008
Posts: 1135
Location: Sun Lakes AZ

PostPosted: Wed Dec 31, 2008 4:37 pm    Post subject: Lousy Idle Reply with quote

Look for an intake manifold leak. Also, are you certain all plugs are good? Do you have an engine analyzer? If so, look for a cold cylinder, one not running close to the other 3 on EGT or CHT. See how it idles on just the magneto, or just the Lightspeed.

On Wed, Dec 31, 2008 at 1:42 PM, DEAN PSIROPOULOS <dean.psiropoulos(at)verizon.net (dean.psiropoulos(at)verizon.net)> wrote:
[quote] --> Engines-List message posted by: "DEAN PSIROPOULOS" <dean.psiropoulos(at)verizon.net (dean.psiropoulos(at)verizon.net)>

Anyone have a few words of wisdom for me:

I'm pulling my hair out over a crappy engine idle that I can't seem to tame.
The basic problem is that I'll start the engine and it fires right up and
runs at about 700-750 RPM just like the book says it should. But from
there, all it seems to want to do is gradually idle slower and slower as the
engine warms up until it barely runs (between 450-500 RPM) by the time I've
done all my checks and am ready to take the runway for takeoff.


The engine is a new Mattituck built TMX-IO360 Lycoming clone with Lightspeed
electronic ignition on one side and a magneto on the other. It also has
Airflow Performance fuel injection with purge valve, a Sterba wood prop and
Mark Landoll's 11 pound steel inertia ring bolted to the flywheel. The
configuration is updraft with the AFP fuel controller bolted to the bottom
of the sump (like carbureted engines) and uses Van's airbox. I've read the
AFP manual and talked to the tech there and adjusted the idle mixture and
stop numerous times but I can't seem to stabilize it. When I have the
cowling off, I make the adjustments and taxi around a bit to warm up the
engine and it seems to be ok. Then I'll put the cowling back on and the
symptoms seem to reappear. There isn't anything banging against the cowling
that I can see that would be causing trouble so I'm totally stumped!

Anyone else having this problem? I'm flying out of a long but narrow strip
with trees on three sides and no good places to land near the airport.
Needless to say it makes me nervous, even though the engine runs strong just
off idle and at full power. Thanks.

Dean Psiropoulos
RV-6A N197DM
4.1 hours







[b]


- The Matronics Engines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Engines-List

_________________
Kelly McMullen
A&P/IA, EAA Tech Counselor
KCHD
Back to top
View user's profile Send private message
azevedoflyer(at)gmail.com
Guest





PostPosted: Sat Jan 03, 2009 5:16 pm    Post subject: Lousy Idle Reply with quote

Dean,
Have you notice any symptons of engine running richer and richer as the idle slows down?
Like brown smoke coming out of exhaust?
If you have a paper air filter, try without it. I've seen some paper filters clog up under higher temps.
Cheers,
Miguel Azevedo
N8714D
PA22/20-150
On Wed, Dec 31, 2008 at 3:42 PM, DEAN PSIROPOULOS <dean.psiropoulos(at)verizon.net (dean.psiropoulos(at)verizon.net)> wrote:
[quote]--> Engines-List message posted by: "DEAN PSIROPOULOS" <dean.psiropoulos(at)verizon.net (dean.psiropoulos(at)verizon.net)>

Anyone have a few words of wisdom for me:

I'm pulling my hair out over a crappy engine idle that I can't seem to tame.
The basic problem is that I'll start the engine and it fires right up and
runs at about 700-750 RPM just like the book says it should. But from
there, all it seems to want to do is gradually idle slower and slower as the
engine warms up until it barely runs (between 450-500 RPM) by the time I've
done all my checks and am ready to take the runway for takeoff.
The engine is a new Mattituck built TMX-IO360 Lycoming clone with Lightspeed
electronic ignition on one side and a magneto on the other. It also has
Airflow Performance fuel injection with purge valve, a Sterba wood prop and
Mark Landoll's 11 pound steel inertia ring bolted to the flywheel. The
configuration is updraft with the AFP fuel controller bolted to the bottom
of the sump (like carbureted engines) and uses Van's airbox. I've read the
AFP manual and talked to the tech there and adjusted the idle mixture and
stop numerous times but I can't seem to stabilize it. When I have the
cowling off, I make the adjustments and taxi around a bit to warm up the
engine and it seems to be ok. Then I'll put the cowling back on and the
symptoms seem to reappear. There isn't anything banging against the cowling
that I can see that would be causing trouble so I'm totally stumped!

Anyone else having this problem? I'm flying out of a long but narrow strip
with trees on three sides and no good places to land near the airport.
[quote][b]


- The Matronics Engines-List Email Forum -
 

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?Engines-List
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Matronics Email Lists Forum Index -> Engines-List All times are GMT - 8 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Powered by phpBB © 2001, 2005 phpBB Group