Today's Message Index:
----------------------
1. 10:15 AM - IO-520BB - Rough running at idle and low RPM (martymitchell)
2. 11:58 AM - Re: IO-520BB - Rough running at idle and low RPM (Daniel Michaels)
3. 02:05 PM - Re: IO-520BB - Rough running at idle and low RPM (F. Tim Yoder)
4. 03:52 PM - Re: IO-520BB - Rough running at idle and low RPM (martymitchell)
Message 1
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| Subject: | IO-520BB - Rough running at idle and low RPM |
I have an IO-520BB in my Beech Bonanza that runs rough at idle and low RPM. I
have changed the spark plugs, cleaned the injectors, checked the mag timing (just
installed after 500 hour inspection and new distributor block), and had a
mechanic check the idle fuel pump pressure and idle mixture setting.
I also did a compression check and all cylinders are above 60/80. There doesn't
seem to be any difference in drop with each mag at various RPM's. I have not
changed the ignition wires.
Any ideas on other things to look for?
Thanks!
--------
Marty Mitchell
Bonanza N44GN
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4247#204247
Message 2
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| Subject: | Re: IO-520BB - Rough running at idle and low RPM |
Cleaning the injectors sometimes creates more problems. I would start there
then go to the splitter and look for flow problems. You can test the flow
-I think at each injector. If you had an engine monitor it should tell yo
u which cylinder to look at. Also look for an air-leak in the intake syst
em.
-
Dan
--- On Sun, 9/14/08, martymitchell <orders@martymitchell.com> wrote:
From: martymitchell <orders@martymitchell.com>
Subject: Continental-List: IO-520BB - Rough running at idle and low RPM
<orders@martymitchell.com>
I have an IO-520BB in my Beech Bonanza that runs rough at idle and low RPM.
I
have changed the spark plugs, cleaned the injectors, checked the mag timing
(just installed after 500 hour inspection and new distributor block), and h
ad a
mechanic check the idle fuel pump pressure and idle mixture setting.
I also did a compression check and all cylinders are above 60/80. There
doesn't seem to be any difference in drop with each mag at various
RPM's. I have not changed the ignition wires.
Any ideas on other things to look for?
Thanks!
--------
Marty Mitchell
Bonanza N44GN
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4247#204247
=0A=0A=0A
Message 3
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| Subject: | Re: IO-520BB - Rough running at idle and low RPM |
Does it smooth out if you lean it at idle?
Tim
----- Original Message -----
From: "martymitchell" <orders@martymitchell.com>
Sent: Sunday, September 14, 2008 10:13 AM
Subject: Continental-List: IO-520BB - Rough running at idle and low RPM
<orders@martymitchell.com>
>
> I have an IO-520BB in my Beech Bonanza that runs rough at idle and low
RPM. I have changed the spark plugs, cleaned the injectors, checked the mag
timing (just installed after 500 hour inspection and new distributor block),
and had a mechanic check the idle fuel pump pressure and idle mixture
setting.
>
> I also did a compression check and all cylinders are above 60/80. There
doesn't seem to be any difference in drop with each mag at various RPM's. I
have not changed the ignition wires.
>
> Any ideas on other things to look for?
>
> Thanks!
>
> --------
> Marty Mitchell
> Bonanza N44GN
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p 4247#204247
>
>
Message 4
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| Subject: | Re: IO-520BB - Rough running at idle and low RPM |
Thanks Tim and Dan. Yes, it smooths out quite a bit when I lean it out (about
two inches of throttle position) but still misfires. I did clean the injectors
with Hoppes #9 gun cleaner but no change.
I'm not sure how to check for air leaks other than to verify tightness of all hose
clamps and intake bolts.
Also, how do you test injector flow? Do you remove them, then capture fuel thru
each one into a cup simultaneously and compare levels? I have Gami's, so I
would expect different levels in Front, Middle and Back positions. Do you use
the boost pump for the test (can't use the engine driven pump)?
I do have an engine monitor (EDM-700) and there's nothing too out of place at cruise,
can't tell at idle as numbers tend to be all over the place.
Thanks...
--------
Marty Mitchell
Bonanza N44GN
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p 4292#204292
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