FAQ and Technical Help

Clean and Flow Test Top Feed Injector ($35 per injector)
Clean and Flow Test Side Feed Injector ($40 per injector)
Clean and Flow Test GDI Injector ($35 per injector)
Evinrude E-Tec ($55 per injector)
Flow Test Only ($12.00 per injector)

Most Fuel Injectors are serviced in two – three days. If rush service is needed, please contact Cobra Fuel Injection Services for expedited service options.

Rough Starting, Misfiring, Hesitation/Stumbling on Acceleration, Shaking at Idle, Loss of Power, Engine Knock, Decreased Fuel Economy and Poor Performance are all symptoms of a poor performing injector.

Only 2% of all fuel injectors actually fail and need replacement. Most fuel injectors can be cleaned and have the filter baskets and O-rings replaced to restore them to factory condition at a fraction of the cost of replacement. Cobra Fuel Injection Systems will not charge for service if the injector truly requires replacement.

Although these detergents may provide some level of cleaning, there isn’t any equipment currently available that will enable the technician to accurately analyze the condition of the injectors while they are on the car to ensure thorough cleaning and proper flow and fuel atomization.

Flow Matching is a process that groups a set of fuel injectors that have similar flow rates. Cobra Fuel Injection Systems can take a large sample group of injectors and “Flow Match” a group of the injectors that will ultimately have a flow rate variance of less than 1%.

At this time Cobra Fuel Injection Systems doesn’t service diesel fuel injectors.

The fuel injector tips clog from solid deposits in the fuel and the filters/baskets collect debris which restricts fuel flow. On car cleaning or fuel additives won’t unclog a filter full of debris. When your injector is performing at optimum levels, it improves emissions, fuel economy, power and cold start dependability.

Cobra Fuel Injector services  the following fuel injectors:

  • Top Feed
  • Side Feed
  • GDI Injectors
  • Natural Gas Injectors
  • ATV Injectors
  • Marine Injectors
  • Snowmobile

Fuel from the fuel rail, under pressure, is sprayed in a very fine miss from the tip of the injector. To achieve this, a current must flow through the fuel injector electrical field coils. Contrary to popular belief, this is NOT done by sending power to the injector. Fuel injectors are normally fed power whenever the ignition key is on, but the circuit is not completed and therefore the injector is still close.

The computer controls the ground side of the circuit. When the computer provides the injector with a ground, the circuit is completed and current is allowed to flow through the injector. This energizes an electromagnetic coil inside the injector, which pulls a sealing mechanism such as a pintle, ball, or disc away from its seat. This makes it possible for fuel to flow through the injector and into the engine. When the computer removes the electrical ground to the injector, the electromagnetic coil becomes demagnetized and a spring forces the pintle, ball, or disc shut to cut off fuel flow. Even at an engine speed of just 1000 RPM, this is done hundreds of times per minute.

Yes, all fuel injectors have filters that will be replaced during service.

Yes, the injectors have a tolerance of 1 Micron, the finest tolerance of any mechanical component on the engine. Fuel manufactures claim their latest generation of fuel additives are designed to prolong the life of your engine by coating the metallic parts of the engine and reduce wear. These additives also coat the internal components of the fuel injector, restricting the fuel flow.