LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums - View Single Post - #3 cylinder mis-fire
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post #10 of (permalink) Old 06-03-2019, 08:23 PM Thread Starter
rmestate
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Join Date: May 2019
Posts: 4
 
The burned insulator happened only once; perhaps there was already a crack when installed. with three different optisparks and three different cap & rotors the result was always the same. likewise with three different plug wires and plugs. compression on #3 showed ~150psi but no leak down check yet. i am suspicious that a manifold removal to fix an oil leak at the back resulted in an intake leak at the port for #3. have to consider the false positive that the toedtli crappy cap was basically still working and the real issue is #3 cylinder....thanks
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