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GM ending stop-sale order on heavy-duty trucks

General Motors responded to an inquiry from Autoblog regarding a stop-sale order on its full-size heavy-duty pickup trucks. Here's GM's official statement. GM is committed to building the highest quality products possible. We paused delivery on a small number of HD pickups with the 6.6 liter Duramax engine last week to finalize an investigation into a potential quality issue. The investigation has been completed and the stop sale will be lifted for the small number of vehicles at dealerships.Customers can be assured GM’s heavy duty pickups are covered by a 5 year/100,000 mile powertrain warranty. The original article continues below. General Motors has reportedly sent its Chevrolet and GMC dealers a stop-sale order that applies to some examples of the 2022 Silverado HD, the 2022 Silverado MD, and the 2022 Sierra HD. The units affected by the stop-sale order may develop an engine-related problem. Citing anonymous sources, website GM Authority wrote that the Duramax 6.6-liter turbodiesel V8 in the affected trucks can hydrolock, which means liquid could enter the cylinders and cause a substantial amount of damage. The report does not specify where the liquid would come from; hydrolocking can happen by driving through a deep puddle of water, for example, but a large amount of coolant can cause it as well. The publication adds that the stop-sale order was assigned internal reference number N222362910. It also notes that the trucks included in it can't be sold, delivered to buyers, traded with another dealer, sent to auction, or even used for demonstration purposes until further notice. Earlier in April 2022, GM Authority reported that General Motors planned to buy back an unspecified number of Silverado HD and Sierra HD trucks due to quality-related issues with the 6.6-liter V8. Details about the problems experienced by customers haven't been released; all we know is that each truck will be replaced, though the replacement may not have the same equipment due to the ongoing chip shortage. Related video:

GM patent reveals new two-stage turbocharger

Modern turbochargers may be some of the best ever made, but performance is something that engineers are always trying to improve. According to GM Inside News, General Motors (GM) is hoping to alleviate some of the negative aspects of a two-stage turbocharger setup with a newly-patented design. The patent, that was filed on May 19, 2016, reveals a clever bypass system that allows the engine, a four-cylinder unit, to optimize both the low-pressure and high-pressure inlets for its respective functions. According to the filing, a conventional two-stage turbocharger setup is engineered to allow both turbines to operate simultaneously at low and mid engine speeds. At high engine speeds, only the low-pressure turbine works. The setup can't isolate either the low or high pressure side, which can impair low-end performance. GM's new two-stage turbocharger setup looks to eliminate this by linking the high-pressure turbo to the exhaust manifold through the high-pressure inlet duct. The low-pressure turbo is attached to the high-pressure turbo by a low-pressure inlet duct, which is linked to a connecting channel. A single actuator that is housed in the exhaust manifold creates a bypass that can opens the high-pressure inlet or close the connecting channel. Depending on what the engine load and speed is, the ECU guides the actuator—a single rotating spindle with discs corresponding to flanges on the high and low pressure sides—to isolate one of the two turbos. Isolating the turbos allow the respective inlets to be engineered for the best possible fluid dynamic performance. The setup should increase performance and decrease lag. There's no word on what car this setup will make an appearance on, but it will most likely be used in premium vehicles before trickling down to the rest of GM's vehicles. Related Video: News Source: GM Inside News, AutoGuide via GM Authority Cadillac Chevrolet GM Technology Sedan turbo patent engine turbocharging

More than half of Mazdas sold in 2018 are CX-5s, and other interesting sales facts

Last year was a seriously good year for carmakers. Overall, more vehicles were sold than in 2017, and the total number wasn't far off of the all-time record in 2016. Digging deeper into the numbers, you'll find some pretty usual stuff including the Ford F-Series still being the bestselling pickup truck in America, and a continued trend toward crossovers. But there are also some oddball factoids tucked in these sales reports, some that defy the trends, and some that are extremes of the public's buying preferences. We've compiled several interesting tidbits from last year's sales right here for your enjoyment. More than half of Mazda's sales were of CX-5s Yes, over half of all Mazda sales were of this one model. The company sold 300,325 cars in America last year, and 150,622 of them were CX-5 crossovers, or 50.1 percent. Just for emphasis, that means the other 49.8 percent of Mazda's sales were split among five other models, the Miata, 3, 6, CX-3 and CX-9. Breaking that down further, the second-best seller was the Mazda3 at 64,638, which isn't even half of the CX-5's sales. People are crazy for Mazda's middle crossover. Volkswagen actually sold more cars than crossovers It's clear that the crossover is the future king of car sales. For most mainstream brands, it already is. Chevy, Ford, Honda, Toyota, Subaru, Mazda and Nissan all sold more crossovers and SUVs than they did conventional sedans and hatchbacks. There are holdouts, though, and one of them is Volkswagen. At the end of 2018, the company sold 189,343 cars and 164,721 crossovers in the U.S. So that's one win for the classic car set, and it's justification for VW to maintain its car line for the foreseeable future. It's a bit of a hollow victory, though. Look closer and you'll see that car sales were down 28 percent from 2017, when VW sold 262,029 cars. Crossovers, on the other hand, jumped 112 percent from 2017 when 77,647 crossovers moved through U.S. dealers. So expect the tables to turn very soon. Mustang is still the muscle-car sales king, but Challenger is the only one to improve Once again, the Ford Mustang topped the muscle-car sales charts, beating out the Dodge Challenger and Chevy Camaro. Ford moved 75,842 of the ponies in 2018, while Dodge sold 66,716 Challengers for second place, and Chevy sold 50,963 Camaros to bring up the rear.