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niky · 04-11-2018, 02:45 AM

Sounds like there might be some pre-detonation or detonation and the engine is pulling timing? But if there's soot on the tail-pipe, I'd check the plugs for fouling.

04-11-2018, 02:45 AM	#2 (permalink)
niky Master EcoModder Join Date: Aug 2010 Location: Philippines Posts: 2,173 Thanks: 1,739 Thanked 589 Times in 401 Posts	Sounds like there might be some pre-detonation or detonation and the engine is pulling timing? But if there's soot on the tail-pipe, I'd check the plugs for fouling.