high EGT

[Guest]

My number 2 cylinder is running significantly higher EGT than the others.  The CHT on #2  is normal and on the lower end of that.  I've check the mags to make sure that it wasn't a plug that wasn't firing. What should I check next?  Should I even be concerned?  It is an old IO360 that otherwise runs nicely.  Could even be the gauge.  It is an old GEM 602.  I am ordering a new G2...

[Hank]

For a quick check, swap the probes between #2 and #4.

If #2 stays high, something is going on; if it's normal and #4 is high, it's a bad sensor. 

[Guest]

That will be my next check. Probe swap. Thanks. 

[Shadrach]

2 hours ago, Kerrville said:

That will be my next check. Probe swap. Thanks. 

Do a mag check first. Dead plug will cause high EGT.

[Guest]

I did the may check in flight after I noted the issue. No change, normal rise on all cylinders including the problem cylinder while running on each individual mag.   My monitor is very old though and does not give absolute temp, just relative temps. I am in the process of ordering a new G2.  The cylinder itself has good compression and looked acceptable on a bore scope inspection.  

[Shadrach]

27 minutes ago, Kerrville said:

I did the may check in flight after I noted the issue. No change, normal rise on all cylinders including the problem cylinder while running on each individual mag.   My monitor is very old though and does not give absolute temp, just relative temps. I am in the process of ordering a new G2.  The cylinder itself has good compression and looked acceptable on a bore scope inspection.  

Sorry. I should have read the OP more carefully.

[Red Leader]

I have seen that issue twice on two different planes in the last couple of years - both times it was a leaking intake gasket causing the mixture to run lean. You might want to check it out. 

[Bartman]

If it is not the plug, then check the intake gasket.  Shake the intake tubes and see if one is loose, especially on the offending cylinder.  If that is good and you have the G2 on the way, I would wait until the installation is complete and then check and base repairs on the new readings.

[Guest]

Good idea.  Swapped probes today.  I will check the security of the intake tubes before I recowl and fly it this weekend. Thanks.