After , cars began to be built with fuel injection systems rather than carburetors because fuel injectors offer better efficiency and performance in delivering fuel to the engine. When you step on the gas pedal in a fuel injection system, the Engine Control Unit ECU of your car calculates what the air-to-fuel ratio should be and signals it to the fuel injectors.
In response, the fuel injectors send a high-pressure spray of fuel to the cylinder, which then powers the engine and makes the car move at the appropriate speed. Fuel injection systems are computer controlled and consider many factors that include: Engine temperature Air pressure Engine RPM Engine start Throttle position Air volume Vehicle speed All of these factors result in powering a car that is more fuel efficient, runs better, and cuts production of unwanted emissions.
If this occurs, your car can develop: Fuel odors inside and around the car Increased fuel consumption Hard starting Oil thinning, which can lead to catastrophic engine failure Hydro lock, which can lead to catastrophic engine failure Poor idle Some of these issues are common to both dirty injectors and leaking injectors. How to clean fuel injectors Many of the symptoms of a dirty or clogged injector are the same as having a bad coil, a broken spark plug wire, or a bad spark plug. Schedule an appointment today.
Find Meineke Near You Services-locations search. Enter Offer Send Services Email :. Check icon for email subscription. Repeat this process for all of your injectors. Keep reading for tips from our mechanic reviewer on how to keep your fuel injectors clean!!
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Create an account. Edit this Article. We use cookies to make wikiHow great. By using our site, you agree to our cookie policy. Cookie Settings. Learn why people trust wikiHow. Download Article Explore this Article parts. Tips and Warnings. Related Articles. Article Summary. Part 1. Purchase a fuel injector cleaner kit with a PEA cleaning fluid. Look for a cleaning kit that is suitable for your type of vehicle.
Each kit should come with a canister of fuel injector cleaner and a hose that attaches to the fuel injector and fuel rail. You can purchase a cleaning kit in an auto store or online. You can also purchase the items in fuel injector cleaner kits separately.
Cleaners that contain polyisobutene PIB will prevent new deposits but will not remove existing ones. Cleaners containing polyisobutylene amine PIBA will remove and prevent buildup, but they are milder and less effective than PEA cleaning fluids. Review your vehicle's engine layout to locate the fuel injectors. Different types of engines have different layouts, so your fuel injectors may be difficult to find.
Take a look at your vehicle's manual to determine where the fuel injectors are located. You can also look up your vehicle online to find this information. Disconnect the fuel pump from the fuel injectors. Brace the fuel pump, which should be located on the side of the engine. Gently pull out the fuel injectors to detach them from the pump.
Once they are removed, connect the fuel return line to the fuel pump so the gas inside it returns to the tank while you're cleaning the injectors. Follow the vehicle-specific instructions in your vehicle's manual if you aren't sure how to disconnect the fuel injectors properly.
Disconnect the pressure regulator vacuum line if you have one. Locate the fuel pressure regulator if your vehicle has one and look for the vacuum line attached to it.
Brace the vacuum line just above where it connects to the regulator. Gently pull it out to disconnect it. The regulator will usually be located just behind the fuel injectors. Connect the cleaning kit to the fuel port.
Locate the fuel port, which should be attached to the fuel rail in your engine. Follow your cleaning kit's detailed directions on how to attach the hose and fitting to the port. This will vary between kits, but you should focus on making sure that the fitting is attached properly to both the hose and port.
The car was not driven for approximately two months prior to the experiment. First a compression and a leak-down test was done. Both checked out fine.
Then the fuel tank was drained. Although the fuel was slightly discolored it had not developed a bad odor and there was no indication of phase separation. An Autronic model B air fuel analyzer was hooked up to the tailpipe and 10 Gallons of fresh gas was poured into the tank.
Throttle response was fair with slight misfires present under free revving. The car was taken on a road trip consisting of some open road and some stop and go driving. Although at cruise the engine ran fairly smooth the Air Fuel Ratio AFR constantly indicating that the engine was running between lean and rich. Stop and go driving showed huge lean-rich fluctuations. Wide open throttle acceleration was very sluggish and produced misfires.
Back at the shop the fuel tank was emptied into a 5 gallon measuring can. Based on this 8. Based on engine size, fuel injector size and fuel type being used etc. AFR ratios indicated lean engine conditions and the car produced 72 HP. The old spark plugs was removed and checked.
All indicated a lean condition. New spark plugs gaped to the correct size was installed and again the car produced 72 hp. The air filter was replaced, again 72 HP. Then the fuel filter was replaced and again the car produced 72 HP.
During dyno testing the fuel pressure under load stayed constant between 43 and 45 psi, indicating a healthy fuel pump. Based on the above we felt that the fuel injectors in the car was dirty and need cleaning.
We removed the injector and flow test them. The first cleaning method we wanted to test was Fuel Injector Cleaner. Also known as injector cleaning additives. This type cleaner is poured into the fuel tank and mix with the fuel. The injectors were reinstalled without cleaning them.
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