Mid City SmartIdle High Idle Kit for Mercedes Sprinter

Overview: The Mid City Engineering SmartIdle High Idle Kit allows compatible Mercedes Sprinter vans to raise engine idle speed while parked. This helps improve auxiliary alternator output and supports vans with larger electrical loads, lithium battery banks, inverter systems, fleet equipment, or RV/camper van electrical systems.

This kit is a strong add-on for Sprinter vans running a secondary alternator system. When the van is stationary, SmartIdle helps the alternator charge more effectively than standard idle, making it useful for off-grid charging, mobile service vehicles, emergency vehicles, and high-demand van builds.

Key Features

• High Idle Control: Raises engine idle speed to help support auxiliary charging and electrical loads.
• Ideal for Dual Alternator Systems: Helps improve charging performance when paired with a secondary alternator setup.
• Sprinter-Specific Fitment: Available for select 906 and 907 Mercedes Sprinter vans.
• Fleet and RV Friendly: Useful for camper vans, ambulance builds, service vehicles, and other high-demand electrical applications.
• Mid City Engineering Product: Built specifically for Mercedes vehicle integration.

Specifications

Fitment Options

PSM / Fitment Note

Some Sprinter vans are equipped with a factory Parametric Special Module, commonly referred to as PSM. This is usually found on vans ordered for upfitter, fleet, ambulance, shuttle, RV, or commercial use. If you are not sure whether your van has PSM, check the factory build sheet for option code ED5 or contact us with your VIN before ordering.

Manuals & Documents

• 907SMRTG4I Installation Manual