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2014 Chevrolet Silverado and GMC Sierra debut all-new designs, three new engines

General Motors has finally dropped the curtain on the 2014 Chevrolet Silverado and 2014 GMC Sierra. Both trucks have undergone substantial revisions with updated versions of the company's 4.3-liter V6, 5.3-liter V8 and 6.2-liter V8 engines. In a shot across the bows of both Ford and Chrysler, GM says it won't use a V6 engine adapted from passenger car applications. Instead, it developed the 4.3-liter engine based on its proven truck-duty architecture.
All three mills will boast direct injection fuel systems as well as a new cylinder head design. Combined with a revised piston, the new engines feature a smaller combustion chamber with a compression ratio of 11:1 or higher depending on the application. Cylinder deactivation and continuously variable valve timing are all part of the recipe, and each engine is paired with a six-speed automatic transmission with auto grade breaking. So far, no fuel economy or horsepower figures have been released, though GM says the new engines will best their predecessors in both areas.
Outside, the trucks feature a number of enhancements to reduce drag and wind noise, and GM claims both the Silverado and Sierra will offer buyers some of the quietest cabins in the class. Extended cab models now feature front-hinged rear doors to allow easier access to the back passenger area, and Crew Cab buyers can now select between a five-foot, eight-inch bed or a six-foot, six-inch bed. Buyers with a mind toward going off road will also rejoice in the return of the Z71 package, complete with Rancho shocks, front tow hooks and additional under-body protection.

GM recalling 521,817 cars in two campaigns

General Motors is issuing two, separate recalls covering a total of 521,817 vehicles worldwide. The larger campaign covers 468,887 units of the 2011-2012 Chevrolet Malibu. Specifically, 437,045 of these are in the US, and the rest are outside the country. In these sedans, a steel cable that connects the seat belt to the vehicle can fatigue and separate. GM knows of 36 claims about the problem but only one minor injury. According to The Detroit News, this happened when a taxi driver hit his head. To fix things, dealers will replace the "outboard lap mounting bracket," which will move the tensioner rearward. They'll also inspect and if necessary replace the steel cable and lap pretensioner. In the second campaign, 52,930 examples the 2015 Chevy Colorado and 2015 GMC Canyon have seat frame attachment hooks that were installed incorrectly during assembly. GM hasn't received any reports of crashes, injuries, or fatalities about this problem. Dealers will inspect the affected trucks and repair as necessary. GM spokesperson Alan Adler told Autoblog that he didn't yet have a specific date when affected owners would receive official mailings about either of these recalls. GM Statement General Motors is recalling 48,309 2015 model year Chevrolet Colorado and GMC Canyon midsize pickup trucks in the U.S. because certain seat frame attachment hooks were not properly attached to the vehicle body during assembly. Dealers will inspect the potentially affected seats for proper installation and repair if necessary. GM knows of no crashes, injuries or fatalities related to this condition. The total vehicle population of the recall is 52,930 including 4,620 vehicles sold in Canada. General Motors is recalling 437,045, 2011-2012 model year Chevrolet Malibus in the U.S. because the flexible steel cable that connects the safety belt to the vehicle can fatigue and separate over time as a result of occupant movement in the seat. Dealers will replace the outboard lap mounting bracket to relocate the tensioner slightly rearward. Dealers will inspect the cable and, if necessary, replace the lap pretensioner. GM knows of 36 claims, no crashes or fatalities and one minor injury reportedly related to the condition. The total vehicle population of the recall is 468,887 including Canada, Mexico and exports.

2016 Chevrolet Colorado Diesel First Drive [w/video]

The first thing you notice inside the diesel Chevy Colorado is that it's quiet. Almost too quiet. A lot has been done to quell noise and vibration with this new powertrain, and it shows – or rather, doesn't. There's some characteristic diesel clatter at idle, but even then it's distant and practically disappears as you start moving down the road. At full throttle, when the engine is at its noisiest, the sound isn't particularly diesel-like, just a pleasant intake breath. The accompanying smoothness is almost eerie. When we ask where all the noise went, Chevy's engineers, marketing guys, and PR reps all explain that this refinement is what Americans want. We're still not sure. This is a truck, after all, and the diesel pickup customer is different from the guy buying a diesel Cruze for his highway commute. Chevy contends that they're also not the same as the buyer of a Silverado HD. Although this 2.8-liter Duramax four-cylinder has been in service elsewhere around the globe, its first US application is in the Colorado and its GMC Canyon twin. The engine puts out 181 horsepower and 369 pound-feet of torque, and it does so unobtrusively as a result of a lot of modifications for our market. To keep normal diesel sensations out of the cabin, the intake and oil pan both get acoustic treatments. A new, thicker material is used for firewall sound deadening. Redesigned balance shafts have tighter tolerances to increase smoothness. The diesel powertrain is smoother than the Colorado's gasoline V6. One of the more interesting and certainly unexpected vibration-reduction changes is a special torque converter from German supplier LuK equipped with a centrifugal pendulum absorber. This pendulum spreads from the center of the torque converter as engine speed increases and is tuned to absorb the four-cylinder's second-order vibrations, not just those in a narrow frequency band. It does an admirable job, especially considering the engine's biggish, 0.7-liter cylinders, which lead to bigger vibrations. The result is a powertrain that's smoother than GM's (not particularly smooth) corporate V6, which is available in the standard Colorado. It's quieter than a Cruze diesel and even out-softens some gas direct-injection engines on the market. Paradoxically, it may be the most refined of all of the Colorados. No vibration comes through the steering wheel, pedals, floorboards, or even the rearview mirror. But you can tell it's a diesel when you hit the throttle.