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The Lincoln Mark LT, introduced in 2005 for the 2006 model year, is a luxury pickup truck from Ford's luxury division. Conceived as a luxury-adorned version of the popular Ford F-150, it was manufactured alongside the F-150 at the River Rouge Plant in Michigan and the Ford Cuautitlan plant in Mexico. The Mark LT was designed to succeed the short-lived Lincoln Blackwood model, featuring a front engine layout compatible with both rear-wheel and all-wheel-drive. Under the hood, it housed a 5.4L Triton V8 engine with a 4-speed automatic transmission, delivering 300 horsepower and 365 pounds-per-foot of torque. The truck came in two sizes; a standard model with a 139-inch wheelbase and 223.8-inch length, and a long-bed version with a 151-inch wheelbase and 235.6-inch length. Standard features included leather seating, heated front seats, a premium stereo with CD/MP3 compatibility, wood accents, and remote keyless entry. Additional options like a rear-seat DVD entertainment system, rear-parking sensor, 18-inch chrome wheels, and a power-operated rear window were also offered. The 2007 facelift brought a new grille and optional DVD-based navigation system, while the 2008 edition introduced a new color option and optional rearview camera backup system.
The 2006 Lincoln Mark LT, particularly those with a 5.4 engine and Roush Supercharger, faces several challenges. The vehicle often experiences power loss, with instances of alternator damage due to polarity reversal during a jump-start. Despite the replacement of multiple components such as the MAF sensor, HTO spark plugs, spark plug coils, cables, PCM, and all Oxygen sensors, issues persist, including pinging, rough acceleration, and potential exhaust leak noises. A key contributor to these problems is the use of low-octane fuel, especially fuels with a 90 RON octane rating, which is inadequate for performance-enhanced vehicles. Such usage can result in severe engine damage and reduced acceleration. Furthermore, the vehicle might display a "reduced engine power" warning, potentially linked to malfunctioning engine management sensors, the ECU, throttle body, oxygen sensors, or the throttle position sensor. Other possible culprits for power loss include clogged fuel filters and failing ignition coils. Another prevalent issue involves spark plugs breaking off during replacement, often due to Ford's Triton V8 engines' two-piece shell plug design. Over time, carbon build-up reinforces this inherent breaking point, complicating plug removal. In response, Ford issued a Technical Service Bulletin (TSB) and introduced specialized tools, while Motorcraft released a one-piece spark plug design. Additionally, a ticking noise is common in these vehicles, resembling "tappet noise." This sound may develop into a knocking noise after prolonged driving, potentially causing the vehicle to stall. Low oil pressure was identified as a potential cause, with engine replacement recommended as the optimal solution. Other sources of this ticking noise include malfunctioning lifters, bent push rods, or oil-related problems. This ticking sound can sometimes intensify during a hot idle, possibly linked to the VCT (Variable Cam Timing) Phasers knock, a recognized issue with 5.4L 3v engines. Other considerations include injector noises or potential issues under the gas pedal.
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