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Discussion Starter · #1 ·
HELP

so iv had my 06 ls3 heads / unknown cammed gto for about 7 months since then its been having a random misfire on cylinder 8 and running rich . Does not show CEL , i only knew it was misfiring by the scanner on HP tuners . Couldnt figure out what it is. Replaced coils,plugs,wires,injectors and 02s and did compression test and leakdown .Also checked for engine grounds So i sent it to a lsx shop 2 months ago . This weekend im getting my car back but they couldnt figure out whats causing the misfire and said its not mechanical and its something electrical.
My next guess would be that the pcm went bad ? What do yall think ? Thanks in advance
 

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Discussion Starter · #3 ·
Iv already tried getting it tuned by 3 different tuners and the valve train looks fine and i had it checked by the shop.
 

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Misfire under load? Idle could be from the cam and false knock?

Have you tried new knock sensors?
 

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Consider swapping a plug and wire with another cylinder. A cracked plug will not fire under compression in certain situations. It would fall under 'free and easy' things to test.
 
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