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NHTSA investigating nearly 750,000 GM models over non-deploying airbags

Nearly 750,000 vehicles built by Chevrolet, GMC, and Cadillac are the subject of a National Highway Traffic Safety Administration (NHTSA) investigation due to non-deploying driver-side airbags. While the investigation is ongoing, the agency believes the issue is likely due to rust particles that form on the inflator's connection terminal interface. The list of nameplates included in the investigation includes Chevrolet's Silverado, Tahoe, and Suburban, GMC's Sierra, Yukon, and Yukon XL, plus Cadillac's Escalade, Escalade ESV, CT4, CT5, and XT4. All of the potentially affected vehicles are 2020 or 2021 models, according to a bulletin published on the NHTSA's website. Investigators launched the probe in April 2021 after 15 consumers reported airbag-related issues, including nine who said an airbag malfunction light appeared in the instrument cluster. More alarmingly, the NHTSA is aware of six accidents that caused significant damage to the car's front end yet didn't trigger the driver's airbag. It adds that there are no fatalities linked to the issue, but there are six crashes and eight injuries reportedly blamed on it. No evidence suggests this problem is related to the millions of potentially deadly Takata inflators recalled over the past few years. General Motors is aware of the defect. It sent a technical service bulletin (TSB) to its dealers in March 2021 to address the aforementioned warning light. The note explains the issue is due to "rust particles in the connection terminal interface of the driver's airbag inflator." The company hasn't issued a safety recall yet, however. Whether it will partially depends on the NHTSA's findings. It's currently looking into the scope and the severity of the problem, and it wants to understand its implications on driver safety. Investigators will decide whether General Motors needs to recall the 749,312 cars that are part of the probe when they close their investigation. General Motors has already spent a significant amount of money replacing defective airbag-related parts in its cars. In November 2020, it was ordered by the American government to recall nearly 6 million pickup trucks and SUVs equipped with potentially dangerous Takata airbag inflators. It repeatedly argued that testing proved the inflators were safe, and it petitioned the agency four times starting in 2016 to avoid a recall, which cost an estimated $1.2 billion (about a third of its net income in 2020).

Cars with the most reckless drivers are full of surprises

Insurify is a site for comparing auto insurance quotes. Because insurance shoppers need to submit information like the vehicles they're driving and the infractions they've compiled while driving those vehicles, Insurify has quite the database of correlations tying certain models to a habit of breaking certain laws. When the site's data analysts decided to compile a list of the top ten models for reckless driving citations in the decade from 2010 to 2019, the ranking contained a few wild entries. The Dodge Challenger making the countdown will surprise precisely zero people. But the Saturn L200? First, a definition: USLegal.com defines reckless driving as "driving with a willful or wanton disregard for safety. It is the operation of an automobile under such circumstances and in such a manner as to show a willful or reckless disregard of consequences." So this list is a caution about particular drivers more than the cars. For a baseline, according to Insurify data, for any random model, 15 out of 10,000 people who drive that model have picked up one citation for reckless driving. Back to that Challenger, then. No shocker for being here, but it's actually number 10, with 44 out of 10,000 Challenger drivers nabbed for a willful disregard of consequences on the road. That's better than the first surprise entry, the Saturn L200, a sedan only on sale for six years, with the least horsepower on the list, and out of production since 2005. The data set put drivers of GM's extraterrestrial sedan at 45 reckless pilots per 10,000 drivers. There are two pickups on the list, the only modern one being the Ram 1500 at eighth, with a rate of 46 in 10,000. Somehow, drivers of the third-best-selling pickup in the U.S. outrun the overwhelming numerical superiority of the best-selling vehicle in the States, the Ford F-150. The other pickup is the Chevrolet K1500 at number five, with a rate of 56 in 10,000. This is not only the oldest vehicle on the list, it went out of production in 2002, before any other vehicle on the list. Between the trucks, the Volkswagen CC slotted in at seven with 47 in 10,000 reckless driving chits, the Cadillac ATS slipped into sixth with 48 in 10,000.  The top four is a bag of unexpected. The Nissan 370Z is the first hardcore sports car on the list at number four, with 61 in 10,000 Z drivers flaunting their Fairladys in the face of Johnny Law.

'Killing a Duramax' Gale Banks YouTube series methodically tunes a diesel to death

Learning or perfecting a skill by watching YouTube videos is known as attending YouTube University. GM Authority picked up on one of the video site's more fascinating courses, hosted by Gale Banks; in a fair world, he should be referred to as Professor Banks when it comes to diesel engines and truck tuning. A few months after GM introduced the updated L5P 6.6-liter Duramax diesel V8 in the 2020 Chevrolet Silverado HD and GMC Sierra HD that ships with 454 horsepower and 910 pound-feet of torque, Banks decided he wanted to methodically tune the engine to death. The purpose of the resulting series, called "Killing a Duramax," is to push more power out of the engine in order to discover which parts break and when — or, as Banks puts it, force-feed the Duramax "until the crank hits the street and the heads hit the hood." With that knowledge, Banks can figure out all the weak points on his way to building what he calls a "Superturbo," that being a supercharged, twin-turbo race engine with more than 1,000 hp. What makes the series fascinating is Banks' knowledge, paired with the company's comprehensive iDash engine monitoring system that keeps tabs on a glut of parameters every step of the way. So for instance, you get Banks explaining the differences between inches of mercury and barometric pressure, how those are different from the water content of the air measured in grains, then showing those readouts on the iDash, then explaining in detail how they affect the air density in the Duramax system. The stock Borg-Warner variable turbo gets a lot of airtime — Banks accuses it of being "out to lunch" because he feels it's the weakest link on the engine. That turns into a turbo teardown and a deep explanation of performance pitfalls, such as when air pressure on the turbine begins to diverge from the boost pressure coming from the compressor. Banks says he can keep close tabs on where power's coming from, because the iDash monitors the horsepower contribution provided by the ambient air, the turbo, and the intercooler separately. The major changes so far are a stouter Precision 7675 turbo and TurboSmart wastegate (episode 5), a twin intake (episode 6), a custom liquid-cooled intercooler from a marine engine, a new GM oil cooler and synthetic oil (episode 10), and new injectors (episode 11).