Low EGT High CHT

[Pablo Canales]

Hey guys!
I own a Cessna 205 with a Continental IO-550

All my cylinders look fine except for #6 which is running cooler EGTs than the rest (1250°F) , and very high CHT (around 400°F) which is 20 degrees above the rest

We already checked and swapped probes, baffles, etc

What does low EGT and CHT mean?


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[Jim Carpenter]

Dirty injector?

 

[MooneyDriver78]

Do the simplest and cheapest things first: clean injector and spark plugs (or replace) for that cylinder.

 

[Pablo Canales]

Do the simplest and cheapest things first: clean injector and spark plugs (or replace) for that cylinder.

We already did both, nothing changed


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[Dan Thomas]

Detonation? A fouled injector could do that.

 

[NordicDave]

Consider checking for an induction leak.

 

[Stewartb]

20° higher isn’t cause for much concern. I’d check the balance tube for a crack.

 

[MooneyDriver78]

Dirty injector?

The EGT and CHT should rise or fall together if this is the problem, depending on if LOP or ROP.
OP said they are reverse directions. Timing advance on that cylinder would explain it, but I thought a bad magneto would affect all cylinders.