Ron has it right.  Since 100LL is a pretty good solvent, it's unusual to need to clean injectors unless there is a physical blockage.  The most common source of injector clogging is from shop rag lint from cleaning them!  A Gami Lean Test will tell you whether or not there is a problem with the injectors.

Walter


On Aug 22, 2011, at 11:28 AM, Ron Laughlin wrote:

You might want to do a "cruise power" LOP mag check before pulling injectors. It's more likely a plug(s) or plug harness problem than an injector. Also, a "GAMI spread" test should be done. Please refer to the GAMI website for instructions.
Ron



On Aug 22, 2011, at 9:09 AM, paul miller wrote:

> Question: On my IO-550N which I run LOP almost all the time, it runs quite well on the stock injectors.  It now has almost 500 hours and I do not believe the injectors have ever been cleaned.    I am getting some small vibration at LOP now and one or two cylinders are getting colder than the others leaning.  I would like to hear from people with experience on how they cleaned, what materials or ultrasonic cleaner was used and whether they replace the o-rings and where to get them.
>
> Paul
> Legacy, Calgary
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