Ovation IO-550: Cylinder 2 Suddenly Lean

[Will.iam]

On 2/21/2021 at 9:34 PM, 1980Mooney said:

Have you pulled the cowling and actually looked at the #2 injector?  When the #2 injector was replaced the only place that the stainless steel pressure fuel line should’ve been disconnected was at the top of the injector.  If debris had entered the line at that point on top of the injector then it should’ve turned up immediately in the injector when the engine was run - not 18 hours later.  There would be no reason for the mechanic to disconnect the fuel line at the fuel distributor when installing an injector. If he did disconnect it at the fuel distributor because he thought the line was dirty then he should’ve cleaned all six lines since they’re all fed from the same common fuel distributor. 
 

I would look for blue stains around the fuel line fitting or on the fins of the cylinder. If that ball and socket fitting mating the injector to the the stainless steel fuel line wasn’t properly torqued it could’ve backed off from vibration during flight and be spraying fuel on the engine.
 

It happened to me. 

I had #3 cylinder go higher on EGT about 4 flights ago but thought it was an abnormality but we did a fuel pressure check and it was leaking. Easy quick test to do. I’d do that before taking the injector off to clean it.