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Date: Sun, 26 Aug 2012 10:55:02 -0400
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From: Gary Casey <casey.gary@yahoo.com>
Reply-To: Gary Casey <casey.gary@yahoo.com>
Subject: Re: Spiked CHT 
In-Reply-To: <listdigest-5729185@logan.com>
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Robert,=0AI would eliminate a spark plug problem before thinking about anyt=
hing else.=A0 If one plug is not firing, the EGT will rise somewhere betwee=
n 100 and 200 degrees.=A0 But why would the plug stop firing during a low m=
anifold pressure lean condition?=A0 A lean mixture is harder to fire than a=
 rich one and maybe this plug is marginal.=A0 Do a mag check when the condi=
tion exists and I'll bet you'll find that on one of the mags the EGT will s=
how which cylinder is not firing.=A0 That will pinpoint the plug not firing=
.=0AJust my guess.=0AGary Casey=0A=A0=0ALast week I had been cruising LoP a=
nd during the power back for landing=0ACyl #3 suddenly jumped 125F and sent=
 the Chelton lady shouting into my=0Aear.  That would not be unusual if I h=
ad failed to either further lean=0Aor go full rich but in this case I had l=
eaned and the other 5 cylinders=0Awere OK.  I leaned way back and really lo=
st power and then went full=0Arich, and it finally settled down.  On the re=
turn flight I reduced power=0Aand carefully kept leaning and had no problem=
.   Yesterday it was deja'=0Avu all over again.  Powered back on approach a=
nd only #3 went nutso=0Auntil I leaned even more.  On the return flight the=
re was no recurrence.=0A=0A=0ADoes this sound like a problem with the injec=
tor, with the thermocouple,=0Aor ? ? ?=0A=0ARobert Simon
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<html><body><div style=3D"color:#000; background-color:#fff; font-family:bo=
okman old style, new york, times, serif;font-size:12pt"><div>Robert,</div><=
div>I would eliminate a spark plug problem before thinking about anything e=
lse.&nbsp; If one plug is not firing, the EGT will rise somewhere between 1=
00 and 200 degrees.&nbsp; But why would the plug stop firing during a low m=
anifold pressure lean condition?&nbsp; A lean mixture is harder to fire tha=
n a rich one and maybe this plug is marginal.&nbsp; Do a mag check when the=
 condition exists and I'll bet you'll find that on one of the mags the EGT =
will show which cylinder is not firing.&nbsp; That will pinpoint the plug n=
ot firing.</div><div>Just my guess.</div><div>Gary Casey</div><div>&nbsp;</=
div><div>Last week I had been cruising LoP and during the power back for la=
nding<br>Cyl #3 suddenly jumped 125F and sent the Chelton lady shouting int=
o my<br>ear.  That would not be unusual if I had failed to either
 further lean<br>or go full rich but in this case I had leaned and the othe=
r 5 cylinders<br>were OK.  I leaned way back and really lost power and then=
 went full<br>rich, and it finally settled down.  On the return flight I re=
duced power<br>and carefully kept leaning and had no problem.   Yesterday i=
t was deja'<br>vu all over again.  Powered back on approach and only #3 wen=
t nutso<br>until I leaned even more.  On the return flight there was no rec=
urrence.<br><br><br>Does this sound like a problem with the injector, with =
the thermocouple,<br>or ? ? ?<br><br>Robert Simon</div><div>&nbsp;</div><di=
v>&nbsp;</div></div></body></html>
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