> Changed all 6 fuel injector O-rings, no improvement.
    > Now the problem is intermittent. After changing the o-rings,
   started the
    > engine, vacuum at about 18", after about a minute it started running
    > smooth,
    > vacuum at about 11", it ran ok for a few minutes then went bad,
   vacuum
    > about
    > 24". It runs ok for a while and bad for a while.
    >
    > Rino
    >
    > Have you checked your injectors? Kind of hard to do with out proper
    > test equipment. Place a long screw driver tip on them and the other
    > end on your ear. See if you can hear all of them clicking when
   the engine
    > is running. Might be hard to do if the engine is very noisy.
    > Even if they are clicking the fuel nozzle might be plugged.
    >
    > Paul Lamar ...No rotor no motor.
    >
    >
    >
    > Rino,
    > Troubleshooting checklist below:
    > 1. Using a handheld digital pyrometer, check the temperature of both
    > exhaust
    > ports. You are looking to see if this is a single rotor issue or
   is the
    > problem effecting both rotors. It does sound like you are
   dropping one
    > rotor. In normal operation, both pipes will read near the same.
    >
    > 2. With it running in the poor mode, spray carb cleaner looking
   for a
    > vacuum
    > leak. It can be as simple as a split hose.
    >
    > 3. Use a timing light to verify spark at all plugs. You can also
   visually
    > inspect the plugs to see they are all firing. Spark plug coils
   can fail
    > intermittent. Also inspect the plug wires.
    >
    > 4. A squirt bottle with fuel can be used to richen the mixture
   when it is
    > running rough. If it smooths out, there is a mixture problem
   caused by too
    > much air or not enough fuel. Do this carefully.... this stuff burns!
    >
    > Remember the three things required to run (assuming there is good
    > compression):
    > Air
    > Fuel
    > Spark
    >
    > Larry

   Is it possible that one apex seal is sticking sometimes?
   When it runs rough it gets too much fuel. I have the control full
   lean and
   it is still too much fuel. When it runs ok the intake vacuum is
   between 11
   and 12" and when it runs rough the intake vacuum is between 18 and
   24". At
   that vacuum the engine controller sends too much fuel for the engine
   speed,
   it is at idle, below 1500 rpm.

   Rino

   That is a possibility. Usually it clears up after running for awhile.
   Unfortunately you cannot visually inspect the apex seals with a finger
   or screw driver in the RX8 engine. Run some WD 40 in there and turn
   it over
   a couple of times. Let it soak over night and then run it. It should
   clear
   up. It could also be an intermittent failure in the injector driver
   transistor
   perhaps. I am not sure of the failure mode. Tracy might know. Is it
   always the same
   rotor. Clicking will stop on the offending injector.

   Paul Lamar ...No rotor no motor.


   Rino,


   you might try to run a leak down test on the engine.  This might
   point out a weak apex seal.

   Joel


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