Nov 19, 2011 · Failure Date: 01/19/2012. The 2. 3 liter 4 cylinder l3t engine that is in my wife's 2007 Mazda Cx-7 has a bad variable valve timing actuator which was verified today by dual Mazda of jacksonville florida. A warranty extension was issued by Mazda around the 14th of January 2012 following the initial TSB (technical service bulletin) date 23 Aug 9, 2020 · 2007 Mazda CX 7 engine problems. Unfortunately, most reported 2007 Mazda CX 7 problems have to do with the engine, which requires very high repair costs and might suggest staying away from this vehicle. 2007 Mazda CX 7 engine problems are either related to issues with the engine timing chain, turbo problems, power loss, ticking noise, and others. frc5Fs.