Join Date: Dec 2010
Location: San Diego
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I replaced the timing chain, all gearing with it including the VVT actuator about 5 months ago.
Car ran perfect for about 3 months, then i put it up for sale. On about the 4th person test driving, i started to notice loss of power between about 1800 and 2700 RPM (estimated). I replaced spark plugs, and coil packs, as i have had issues with those parts in the past with no effect. I took it into mazda, and they said they are seeing misfire counts on all 4 cylinders. The problem is inconsistent. Sometimes it doesn't happen at all, sometimes it lags quick and comes back (like when traction control takes over). Sometimes it bogs and doesnt recover until i push in the clutch rev the engine out and re apply throttle under load. Mazda also said all sensors seem to be functioning normally. I also checked the compression and i get 175 PSI on all 4 cylinders.
Has anyone had an issue like this? I am thinking the VVT actuator I installed may have gone bad? I know there was the TSB on VVT. Did anyone have this issue? what were the symptoms?
I also think i may have a small exhaust leak in the exhaust manifold. Small enough you cant hear it. Could this also be the cause?
2006 Mazdaspeed 6. White, Grand Touring, Nav. Block8head pod + boost gauge, SURE SRI, All weather Mats, Additional 12v socket.