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Mazda CX-5, Mazda6 and Mazda3 could stall due to software glitch

Mazda is recalling 262,220 vehicles due to a software error that could cause the engine to unexpectedly stall out. The recall affects 2018-2019 CX-5 crossovers, 2018-2019 Mazda6 sedans and 2019 Mazda3 models.  According to NHTSA recall No. 19V497000, which was filed June 27, a programming issue in the powertrain control module (PCM) on select Mazda vehicles could cause the engine to shut down. More specifically, "the software controlling the hydraulic valve clearance adjuster may operate improperly when transitioning from cylinder deactivation to full cylinder activation modes." This could potentially cause the intake valve rocker arm to come out of position and hit something else in the engine. If this occurs, the engine could misfire, the engine could lose power, and the Malfunction Indicator Light would be triggered. The recall affects 143,004 2018 CX-5s, 81,236 2019 CX-5s, 18,295 2018 Mazda6s, 2,551 2019 Mazda6s, and 17,134 Mazda3s. Some cars from those model years received the improved software at the factory and won't be affected by the recall. Although the first report of a related issue was chronicled in January 31, 2018, no injuries tied to the problems have been reported. Mazda is expected to start its recall on or before August 26, 2019, and will reprogram the PCM with improved hydraulic valve adjustment control programming for free. Contact Mazda at 1-800-222-5500, reference No. 3719F, for more information.

Mazda MX-30 crossover is brand's first EV, with sporty, coupe-like looks

TOKYO — Mazda's first production full electric car has finally been revealed, and it's called the MX-30. And the name and shape point to it being a sporty, fun EV, though we're still waiting for more details. Starting with the name, the 30 designation gives you an idea of its size, which is similar to the upcoming CX-30, itself close to the Mazda3 hatchback. And importantly, it has the MX prefix, which is only used on Mazda's sporty cars, typically with piston engines. The RX prefix is for sporty rotary cars. So clearly the aim of this car is to be fun. Its shape points to sportiness, too. It has a fastback roofline that is coupe-like. In fact, you could arguably call this a coupe, since it uses the same type of rear half-door arrangement found on the RX-8 and Saturn Ion coupes. And of course it was used on the less coupe-like Honda Element and Toyota FJ Cruiser. The roof also is available in a contrasting graphite color. The lower half of the body is simple, and a bit boxy with the blunt nose. That nose features a much smaller rendition of Mazda's pentagonal grille, and the grille blends into the headlights. And like all crossovers, the MX-30 has big plastic fender flares. Inside, the MX-30 features a typically minimalist, modern dashboard that's low and wide. New for the MX-30 is a touchscreen display for climate control functions, and it sits on a "floating" center stack and console. The cabin features unique materials such as fabric made from plastic bottles, and cork in the center console. That cork is made of leftovers from a cork stopper company, and it's a nice throwback to Mazda's origins as a cork producer. While we get a great look at the MX-30 inside and out, Mazda was light on critical details for an electric car: power and range. Both are mysteries, though it seems it is a single-motor vehicle, and so is likely front-drive only. It does feature an electric version of G-Vectoring Control, which is the system that reduces torque with steering input to shift weight forward for a larger front contact patch and more eager turn-in. The battery, located in the floor of the car, is cooled with a refrigerant, so it isn't simply air-cooled, and the car will be compatible with DC fast charging stations. Mazda also didn't provide an on-sale date for the MX-30. We expect it will be available sometime in the next year. Whether it will come to America is also an open question. But as a stylish crossover, it seems like it would be an EV with U.S.

How Mazda got Skyactiv-X to work is incredible

"Take everything you know about engines and turn it around," Mazda North America Vehicle Development Engineer Dave Coleman says, patiently and with a look of benevolent pity, as he's quizzed about the particulars of the company's new engine. The Skyactiv-X engine is enigmatic — and deceptively simple in operation. And the bottom line for American consumers is that they'll be able to buy a car (or crossover; we don't know yet what vehicle will first get it) by late 2019 that provides diesel-like fuel economy but runs on regular old gasoline. In between diesel and spark ignition, but it's neither To truly understand it, you have to dive into the contradictions. Take that regular old gasoline: Contrary to common sense, the lower the octane, the better it works. In the lab, the Skyactiv-X engine loves 80 octane. The lowest Americans get is 87, so the engine is tuned for that octane. Go higher and you lose some low-end torque. Coleman was right. It's hard to wrap your head around an engine that thrives just at the point when most gas engines would aggressively self-destruct. It uses a supercharger to pump additional air — but not additional fuel. It uses spark plugs to start a combustion cycle that normally doesn't need a spark. And, quixotically, it's not displacing Mazda's own American-market diesel engine, currently languishing in a seemingly endless hell of regulatory approval. More bizarre: Mazda is a tiny automaker facing real existential headwinds, and gasoline compression ignition is a massive challenge. GM and Hyundai announced compression ignition, or HCCI, projects (full name, homogeneous charge compression ignition) to great fanfare, but they never amounted to a production hill of beans, crippled by reliability issues or horrible vibrations. Worse, they only worked at an unusably narrow range — low RPMs and low loads. HCCI research improved direct-injection gas and diesel engine technologies for these companies, but HCCI itself remains untamed. The benefits of lean combustion Why even try to tame HCCI? The answer is much better fuel economy and lower emissions. Less burned carbon-based fuel, less carbon dioxide released. That's simple. But there are some thermodynamic reasons for the lean combustion you can achieve with compression ignition that are worth explaining. The ideal amount of fuel for a conventional engine to burn is about a 14:1 air-to-fuel ratio. That lets every molecule burn nicely, in theory.