Diesel Engine Service

Diesel engines are built to work harder and last longer than their gasoline counterparts — but only when they're maintained and repaired by technicians who understand the unique demands of diesel technology. At Northstar Automotive Group in Gormley, ON, Master Mechanic Dawood Motala and his team provide specialized diesel engine services for light trucks, commercial vehicles, and passenger cars equipped with diesel powerplants. From routine fuel filter replacements and glow plug service to high-pressure common rail diagnostics, DPF regeneration, and diesel performance tuning, we have the tools, training, and hands-on expertise to keep your diesel running clean, strong, and efficiently for the long haul. Diesel problems left unaddressed have a way of compounding quickly and expensively — which is why a diagnostic-first approach and a team that knows diesel isn't just a preference, it's a necessity.

Diesel Injector Cleaning & Replacement

We clean and replace diesel fuel injectors using professional ultrasonic cleaning equipment and flow testing, restoring the precise spray pattern and fuel delivery your diesel engine needs for clean combustion, strong power output, and acceptable fuel economy.

Glow Plug Replacement

We replace worn or failed glow plugs that cause hard cold starts, white smoke on startup, and rough running in cold weather — a critical diesel maintenance item that Ontario winters make impossible to ignore.

Diesel Fuel Filter Replacement

We replace diesel fuel filters at the correct service interval with proper system bleeding and water separator draining, protecting your high-pressure injection system from the fuel contamination that rapidly accelerates injector and pump wear.

Turbocharger Wastegate Repair

We diagnose and repair turbocharger wastegate actuators and linkages that cause overboost, underboost, and limp mode conditions on diesel engines, restoring proper boost pressure control and the performance your turbocharged diesel was built to deliver.

Diesel Particulate Filter (DPF) Regeneration

We perform forced DPF regeneration cycles and professional filter cleaning for diesel particulate filters that can't complete passive regeneration on their own, restoring exhaust flow and fuel economy without the cost of a full filter replacement when the substrate is still serviceable.

EGR Valve Cleaning (Diesel)

We clean heavily carboned diesel EGR valves that cause rough idling, reduced power, increased fuel consumption, and check engine lights, removing the soot buildup that restricts valve movement and compromises your engine's emissions and performance.

DEF Tank & Heater Repair

We diagnose and repair diesel exhaust fluid tank faults and failed DEF heaters that cause warning lights and power restrictions in cold weather, restoring proper DEF system function and keeping your diesel compliant and out of reduced power mode.

High-Pressure Common Rail (HPCR) System Service

We service high-pressure common rail fuel systems with the specialized knowledge and equipment these precision systems demand, diagnosing pressure faults, injector return flow issues, and pump wear that standard diagnostic tools and general technicians often miss.

Diesel Tune & Performance Optimization

We perform diesel ECU tuning and performance optimization that improves torque output, throttle response, and fuel economy by refining injection timing, rail pressure, and boost parameters — tailored to your specific engine and how you use your vehicle.

Lift Pump Replacement

We replace failing diesel lift pumps that starve your high-pressure fuel pump of adequate supply pressure, causing hard starts, low power, and accelerated injection system wear that becomes far more costly than the lift pump replacement itself.