The owner can produce a comprehensive review of vehicle maintenance (showing sufficient oil changes and never using an engine oil of viscosity lower than 5W-30.The mechanics were able to determine that the VVT or timing chain is worn.Mazda said it would replace the VVT actuator, or both the VVT actuator and the timing chain, free of charge if: " Mazda Motor Corporation has decided to conduct a Special Service Program (SSP) to extend the warranty coverage for the specific repair of variable valve timing (VVT) noise and/or timing chain noise concern, on certain 2007-2010 CX-7 vehicles equipped with 元T engine and produced from Februthrough February 26, 2010, and 2007-2010 Mazdaspeed3 vehicles equipped with 元T engine and produced from Jthrough February 27, 2010, and 2006-2007 Mazdaspeed6 vehicles equipped with 元T engine and produced from Augthrough June 30, 2007." Models Most Affected ∞ VVT Infographic The VVT Extended Warranty ∞īecause of VVT problems, Mazda issued a “special service program” to extend the vehicle’s warranty to 7 years from the original start date, or 70,000 miles (whichever comes first).
Left untreated these problems can lead to oil leaks, stretched out timing chains, and catastrophic engine failure. While driving (under 2,000 RPM), excessive stretching of the timing chain can cause a knocking / rattling noise.When first starting the engine, a loud ticking can be heard from the VVT.In Mazda’s case, a defect with the VVT has been known to lead to specific and costly problems: Mazda’s Issues with VVT ∞Īutomakers all use a variety of VVT systems, but they all come with one thing - complexity. Variable valve timing (VVT) uses technology to control the opening and closing of your engine’s valves in an effort to increase fuel economy, generate more power, and/or limit emissions. That is wasteful and advances in engine technology now allow the timing, lifting, and duration that valves are left open to all be tweaked. Early on, valves opened and closed for a specific amount of time only.
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