How to Clean Fuel Injectors in Honda Cars

Written by alibaster smith
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How to Clean Fuel Injectors in Honda Cars

Fuel injectors in your Honda are responsible for metering fuel into your engine. Since Honda makes primarily low-displacement, four-cylinder engines, many of their injectors are small and do not accommodate a large volume of fuel. Even so, it is important to keep the fuel injectors clean because, over time, contaminants in the fuel system (rust and other debris) can clog the injectors and cause an improper combustion cycle. If the combustion chamber tries to cycle through its normal compression stroke and there is not enough fuel to burn, or the fuel levels differ from one cylinder to the next, you will not get optimal power and fuel economy from your engine.

Skill level:
Moderately Easy

Things you need

  • 2 cans of Sea Foam (available at any auto parts store)
  • Philips head screwdriver

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  1. 1

    Fill the gas tank with gasoline.

  2. 2

    Open the gas tank door, unscrew the gas cap and pour in one bottle of Sea Foam.

  3. 3

    Park the vehicle in a well ventilated area, start the engine, and allow your Honda to reach normal operating temperature. Turn off the vehicle.

  4. 4

    Open the bonnet and locate the power brake booster. It is a round, disc-shaped device that is bolted to the driver's side of the firewall. The brake master cylinder is bolted to the front of the brake booster.

    How to Clean Fuel Injectors in Honda Cars
  5. 5

    Remove the vacuum hose connected to the brake booster. You will need to loosen the screw on the hose clamp and slide the hose clamp out of the way before pulling the hose off the booster.

  6. 6

    Turn on the vehicle. You will notice that the RPMs will rise sharply to anywhere between 2,000 and 3,000 RPM. Since you've just created a large vacuum leak, this is normal. Attach a funnel to the end of the brake booster vacuum hose and slowly pour in 1/2 can of Sea Foam. Do not allow the engine to stall before you've poured in 1/2 of the can.

  7. 7

    Turn off the vehicle and reconnect the brake booster vacuum hose.

  8. 8

    Allow the vehicle to sit for 15 minutes, then turn it on. It may be difficult to start. This is normal. Eventually, the vehicle will turn over and your vehicle will begin to smoke heavily. This is the carbon that has built up inside of your engine.

  9. 9

    Drive your Honda on the highway or a road where you can open the throttle up and rev the engine up to the engine's redline. It is important that you are able to open the throttle up all the way (called "wide open throttle") so that the Sea Foam gets into all areas of the engine and works its way through the system quickly. After an initial aggressive driving period of about 20 minutes, continue to drive your Honda until the tank is empty. Fill the tank up again, add the remaining 1/2 can of Sea Foam and drive the vehicle normally. You should begin to notice an improvement in fuel economy and throttle response on the second tank of gasoline containing the Sea Foam. This indicates that your fuel injectors have been thoroughly cleaned.

Tips and warnings

  • For specific information about fuel injectors in your Honda, consult the vehicle's manual. Sea Foam provides instructions on fuel injector cleaning (see Resources).

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