Dirty or clogged fuel injectors can cause severe engine problems such as poor engine performance and an increase in fuel consumption. Luckily, the problem is easily avoided, as cleaning injectors yourself while they are still attached to your Jeep Grand Cherokee is economical and easy.
Open and secure the bonnet. Disconnect the fuel pressure regulator, the small silver canister at the end of the fuel rail. Install the U-tube in the fuel rail where the regulator was connected, on the right side of the engine, so fuel will circulate back into the fuel tank. Remove the gas cap to relieve fuel tank pressure.
Following the directions listed on the fuel kit, screw on the hose from the fuel injector cleaning kit to the fuel port lon the fuel rail.
Open the kit valve until the pressure reading gauge on the kit matches the appropriate pressure for your vehicle. The pressure reading should be 31 psi for most Grand Cherokees. Consult your owner's manual to be sure.
Start the engine and run until all solvent has been used and engine dies from lack of fuel.
Replace the fuel cap. Remove the U-tube. Reconnect the pressure regulator. Run the engine to notice any change in performance. Repeat the procedure if necessary.
Gasoline is highly flammable. Quickly clean up any spilt fuel and do not work near open flame or direct sunlight.