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1984 12A rx7-Spark plug hole question

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Old 12-01-21 | 09:26 AM
  #1  
captain_crunch22's Avatar
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1984 12A rx7-Spark plug hole question

Hello,

How do these spark plug holes look(what is going on with them), and are they all supposed to look the same? I have attached labeled photos below.

Just for more context about the car: Has been sitting for 6-7 years in a garage before I received it, before sitting it ran(not great), currently the engine cranks and pops a bit but won't start, also the T1 and T2 plugs are wet when taken out, the L2 plug is a little bit wet, and the L1 plug is dry

Thanks in advance!











Old 12-02-21 | 06:06 AM
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What you're seeing is normal. In the Leading 1 photo, what you see is the apex seal passing by the spark plug hole. In Leading 2, you are seeing the non combustion chamber part of the rotor. Carbon is built up on the rotor. In Trailing 1 it appears that the rotor is just past an apex seal, and in Trailing 2, you are seeing part of the rotor again.

Now, in Trailing 2, my concern when seeing that rotor is rust... its hard to tell but it appears rusted..unless we are seeing the light on carbon and it just appears brown. Rust happens when coolant or water enters the housing and it is left to sit. I would do some more investigating through the leading aide of the #2 rotor to make sure there is no rust on the rotor. Maybe its just the lighting? But the flooding on the #2 rotor would be my concern.

You can remove the spark plugs on the #2 rotor and crank the engine over and listen for good even pulses on that rotor. Otherwise, if you can get it to run long enough to warm up a bit, I would do a proper compression test with a rotary compression tester.
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