Category Archives: Car & Truck

Teaching Yourself Series. A Study On Secondary Ignition Waveforms

Automotive CAT Scans & MRI’s

Teach Yourself Series A Study On Misfire

Teach Yourself Series MAF code P0101 part 2

Bleeding Brakes By Yourself

Look At Long Term Fuel Trim First

The 12 Must-See Highlights from the 2018 New York Auto Show

The 12 Must-See Highlights from the 2018 New York Auto Show2019 Acura RDX2019 Audi RS5 Sportback2019 Cadillac XT42019 Genesis G702019 Honda Insight2019 Jaguar F-Pace SVRLincoln Aviator Concept2019 Nissan Altima2019 Subaru Forester2019 Toyota Corolla Hatchback2019 Toyota RAV4Volkswagen Atlas Tanoak Concept

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2019 Cadillac XT4: Finally, a Smaller Caddy Crossover – Official Photos and Info

2019 Cadillac XT42019 Cadillac XT42019 Cadillac XT42019 Cadillac XT42019 Cadillac XT42019 Cadillac XT42019 Cadillac XT42019 Cadillac XT42019 Cadillac XT42019 Cadillac XT42019 Cadillac XT4

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Down to Earth: 2019 GMC Sierra AT4 Arrives as a Mild Trail Upgrade


Since the Ford Raptor began flying off dealer lots in 2010, Ram and General Motors have responded only halfheartedly, leaving the Blue Oval’s Baja racer in a class of its own. That will still be the norm for full-size pickups after the arrival of this 2019 GMC Sierra AT4, a far less intense off-roader than the latest Raptor or the Hellcat-powered Rebel anticipated later this year.The AT4—which, a GM spokesman said, does not stand for “all terrain”—is a burlier, trail-hardened trim that will spread across the GMC lineup. It’s a relatively mild tweak of the all-new Sierra 1500 for less extreme off-road duty. Visually, it’s an SLT with a two-inch lift kit, red tow hooks, and enough darkened chrome pieces to pass for yet another “midnight” edition. Available in crew-cab trucks with the short bed, the AT4 has standard four-wheel drive with a two-speed transfer case (of course) and sports standard 18-inch wheels wearing mud-rated Goodyear Wranglers and suspended by Rancho monotube dampers that come from a small Michigan supplier. Optional 20-inch rims may fill in the giant air gaps in the fender wells. Embroidered headrests, darkened aluminum trim, and all-weather floor mats decorate the interior, which also features hidden storage space within the rear seatbacks and a second tray beneath the seat rests.


New to the AT4 is the Traction Select System, GMC’s take on terrain mapping, which alters throttle, transmission, and stability control settings to suit the environs. It pairs with the standard 5.3-liter V-8 and eight-speed automatic transmission but also is available with the 6.2-liter V-8 or the new turbo-diesel 3.0-liter inline-six. The latter pair come with the 10-speed automatic co-engineered with Ford. A locking rear differential, hill descent control, and four-wheel drive help claw the AT4 out of sticky situations. The bed comes standard with GMC’s multi-piece MultiPro tailgate, also on SLT and Denali trims, and optionally with carbon-fiber panels, also to be an option on Denali models. That aptly named CarbonPro bed has indents designed to snugly secure motorcycle and quad tires, plus it features extra tie-down hooks.

Otherwise, the AT4 is a pretty normal Sierra 4×4 that can be appointed with all kinds of extra safety aids and electronics like a digital rearview mirror and a multicolor head-up display including an inclinometer. We wish GMC would aim to fly higher, as Chevrolet has indicated it’s ready to do with the mid-size Colorado ZR2. In any case, look for the AT4 starting this fall.


2018 New York Auto Show Full Coverage

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Dallara Stradale Driven! Racing Constructor Builds One for the Road


While automakers love to fit aggressive-looking rear wings to their cars, and often claim that they help them stick to the pavement, the reality is that few street cars generate much downforce. The all-time champion was the Dodge Viper ACR, the sorta-streetable special that wowed us at Lightning Lap a couple of years ago, and which we’re told could generate up to 2000 pounds of downforce with its rear wing turned to its most aggressive angle. More recently, McLaren has said that the upcoming street version of its Senna hypercar will make up to 1764 pounds. But now there’s another member of this aero club in the considerably more svelte form of the Dallara Stradale. This wind-tunnel-tuned Italian lightweight can produce 881 pounds of downforce in its standard form, and a massive 1808 pounds when wearing its optional rear wing. All while still being street legal—in Europe, at least. READ MORE ››

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