Fuel Injector Replacement Costs For Isuzu Trooper

Isuzu Trooper owners may need to replace their fuel injectors if they experience engine misfires, rough idling, or trouble starting the vehicle. The cost of replacing fuel injectors can vary depending on the year and model of the Isuzu Trooper, as well as the brand and quality of the replacement injectors. On eBay, prices for fuel injectors for the Isuzu Trooper range from $54.32 to $169.99 per injector. Amazon also offers fuel injectors for the Isuzu Trooper, with prices starting at $69.99 for a set of six injectors. It is important to note that replacing fuel injectors can be a complex task and may require specialized tools and knowledge. Isuzu Trooper owners should carefully consider whether they have the necessary skills and resources to replace the fuel injectors themselves or if they should seek the assistance of a qualified mechanic.

Fuel injector replacement cost

The cost of replacing a fuel injector on an Isuzu Trooper depends on a number of factors, including the year of the vehicle, the type of fuel injector, and whether you choose to replace the injector yourself or take it to a mechanic.

If you choose to replace the fuel injector yourself, you will need to purchase a replacement fuel injector that is compatible with your specific Isuzu Trooper model. The cost of fuel injectors can vary depending on the brand and quality, but they typically range from $30 to $200 per injector. In addition to the cost of the injector itself, you may also need to purchase a fuel injector o-ring kit and a safe lubricant to help with the installation.

If you take your vehicle to a mechanic to replace the fuel injector, the cost of labour will also need to be factored into the total replacement cost. The labour cost can vary depending on the mechanic and the complexity of the job, but it typically ranges from $100 to $300 per hour.

It is important to note that the Isuzu Trooper has different fuel injector requirements for different model years. For example, the 1995 Isuzu Trooper SOHC 3.2L engine uses a different fuel injector than the 1993 to 1994 Isuzu Trooper 3.2L DOHC engine. Therefore, it is crucial to identify the correct fuel injector for your specific Isuzu Trooper model before purchasing a replacement.

Additionally, it is recommended to replace all the fuel injectors at the same time, as they tend to build up varnish and dirt over time, which can cause performance issues. By replacing all the injectors, you can help ensure that your vehicle runs smoothly and efficiently.

Injector failure symptoms

There are several symptoms that can indicate a fuel injector failure. Here are some of the most common signs:

• Hesitation when accelerating: If you experience hesitation or a lack of responsiveness when you press the accelerator pedal, it could be due to a faulty fuel injector. This is often caused by a restriction in the injector, preventing the necessary amount of fuel from being delivered to the engine.
• Misfiring: Misfiring can be caused by various issues, including fuel injector problems. If one or more cylinders are not receiving the correct amount of fuel due to a faulty injector, it can result in the engine misfiring or running unevenly.
• Trouble codes: If your vehicle is equipped with an OBD II system, you may notice specific trouble codes such as P0300 (Random Cylinder Misfire) or P0301 to P0306 (Cylinder #1 to #6 Misfire). These codes indicate that the engine control module has detected a misfire in one or more cylinders, which could be related to fuel injector issues.
• Rough idle and loss of power: A faulty fuel injector can cause the engine to idle erratically or run roughly. It may also result in a loss of power, making it difficult to maintain a steady speed or accelerate as expected.
• Odor of raw gasoline: If you smell raw gasoline around your vehicle, it could indicate a leaking fuel injector. Leaking injectors can allow fuel to escape into the intake manifold or combustion chamber, causing a strong gasoline odour.
• Check engine light: A malfunctioning fuel injector may trigger the check engine light. This could be due to various issues such as a faulty solenoid or a problem with the electrical circuitry of the injector.
• External leaks: While rare, it is possible for a fuel injector to leak externally. This can be dangerous and should be addressed immediately. If you notice fuel dripping from the injector or fuel accumulation around it, it needs to be replaced.
• Increased fuel consumption and reduced efficiency: Faulty fuel injectors can cause an imbalance in the fuel delivery to the cylinders, resulting in increased fuel consumption and reduced fuel efficiency.

Fuel injector testing

Testing the fuel injectors on your 3.2L Isuzu Trooper is not difficult. You can use a multimeter to check the injector's resistance and figure out if it's bad or not. Here are the steps to test the fuel injectors:

• Disconnect the fuel injectors from their harness connectors.
• Set your multimeter to Ohms (Ω) mode.
• Measure the resistance of the fuel injector across its two male spade terminals with the multimeter test leads.
• Write down the resistance value that your multimeter records for the specific fuel injector you're testing.
• Repeat steps 3 and 4 on the remaining fuel injectors. The Isuzu fuel injector resistance specification is: 11.8 to 12.6 Ohms.

Interpreting the Results:

• Case 1: If all fuel injectors registered the same resistance values, this confirms that the coil windings of all injectors are OK.
• Case 2: If one of the fuel injectors registered a completely different resistance value, this indicates that the fuel injector is bad and should be replaced.

Symptoms of a Bad Fuel Injector:

• Hesitation when you accelerate your Isuzu Trooper down the road.
• Misfire trouble codes (for OBD II equipped vehicles only): P0300 to P0306.
• The fuel injector's internal winding suffers a short-circuit or open-circuit problem, causing it to stop injecting fuel.
• The fuel injector is clogged and does not inject enough fuel or does not inject properly.
• The fuel injector turns on and doesn't turn off, spraying a large amount of fuel as soon as you turn the ignition key to the ON position.

Where to Buy Fuel Injectors:

You can find fuel injectors for the Isuzu Trooper online on websites such as Amazon, eBay, and specialist automotive stores. When purchasing, ensure the injectors are compatible with your specific Trooper model and engine type.

Injector replacement procedure

Step 1: Relieve the pressure in the fuel rail

Before beginning work on your Isuzu Trooper, ensure the engine is cold. Then, to relieve the pressure in the fuel rail, run the engine briefly with the fuel pump fuse removed.

Step 2: Remove the upper plenum and any obstructing cables, hoses, or wiring

Remove the upper plenum from the intake manifold, along with any cables, hoses, or wiring that may be restricting access to the fuel injectors.

Step 3: Disconnect the supply and return lines and electrical connectors

Disconnect the supply and return lines from the fuel rail, and unlock and remove the electrical connectors from each fuel injector.

Step 4: Remove the fuel rail

Unbolt and remove the fuel rail from the intake manifold. Be careful not to let any debris enter the exposed openings.

Step 5: Remove the injector(s) requiring replacement

The injector(s) can now be removed from the fuel rail. Injectors are usually held in place by an O-ring seal within a finely polished bore in the fuel rail, so they may require some force to remove.

Step 6: Re-insert the serviced or replaced injector(s)

Using a new O-ring, re-insert the serviced or replaced injector(s) into the fuel rail. Take care not to damage the new O-ring during this process, and ensure it is inserted firmly to prevent fuel leaks.

Step 7: Re-install the fuel rail and reconnect the supply and return lines

Bolt the fuel rail back into place on the intake manifold, and reconnect the supply and return lines.

Step 8: Re-install the plenum and all cables, hoses, or wiring

Re-install the upper plenum, along with all cables, hoses, or wiring that were removed earlier.

Step 9: Run the engine and check for leaks

Finally, start the engine and carefully check for any fuel leaks. If no leaks are detected, take the vehicle for a road test to ensure the injectors are functioning correctly.

Injector cleaning

Step 1: Prepare the work area

• Ensure you are working in a well-ventilated area.
• Make sure the engine is cool to the touch before beginning work.

Step 2: Locate the injectors

• Disconnect the fuel pump from the engine.
• Disconnect the injectors from the fuel pump.
• If your engine has a fuel pressure regulator, disconnect it and reconnect the fuel line.

Step 3: Attach the injector cleaner kit

• Find the fuel port and attach the hose from the injector cleaner kit to it.
• Remove the fuel tank cap to prevent building up fuel pressure.

Step 4: Run the injector cleaner

Start your engine and let it run for 5-10 minutes with the injector cleaner kit attached.

Step 5: Reassemble the fuel system

• Disconnect the injector cleaner kit and close the fuel tank cap.
• Reattach the fuel pressure regulator and the fuel pump.

Step 6: Test the engine

Turn on your car and monitor engine performance.

It is important to note that injector cleaning may not always be sufficient to restore the injectors to full functionality. In some cases, replacement may be necessary. Additionally, unless you have a good grasp of how these parts work, it is recommended to leave fuel injection replacement and cleaning to professional mechanics.

Frequently asked questions