Jeep injector

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Replacing a Single Fuel Injector

I have a 2002 Jeep Liberty with close to 150k miles. My main question for now concerns removal of the fuel rail. I've watched a Youtube video where the rail was completely removed with all injectors still attached. Since I will likely only be replacing just one injector, can I remove the clips for each injector (so the injectors will stay in and not be "unseated"), lift the rail off, then just pull the #1 injector, replace it and then reinstall the rail over the other injectors and use new orings in the rail?
Background: I have a fuel injector that I believe is "stuck open". I am getting a P0201 and P0161 codes .The injector wire plug itself checks out and appears to be working as it should (steady power, pulsing ground when checked with a probe light). When hooked to the ODB reader in Live Mode, I can see that my Bank2Sensor2 is staying around the same level as the others, so I'm guessing it's throwing a code due to the rich fuel condition. I will be checking continuity on the injector itself tomorrow, and I fear the worst. Sorry for the long post, and thanks for reading and any advice you can give me!



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Once the fuel injectors were replaced, trail running in the XJ was fun again—and odor free.

If you’re experiencing leaking fuel injectors, you might think new O-rings will correct your engine’s fuel delivery problems, but you’d probably be wrong. O-rings might do the job but usually they are only a temporary fix. If your fuel system is leaking all over the intake manifold through the injectors, you’ll need to replace the injectors. And if you can change the O-rings, you can change the injectors. But you’ll still need a good shop manual.

Each individual injector is packaged separately from Summit Racing, in case only one or two are needed to correct the problem. We decided to replace all of them at one time.

This is how we discovered the 1990 Cherokee’s injectors were bad; they were spraying more fuel on the engine than in the engine. It was at night and all we noticed was a very slight gas odor, so we thought it was a minor leak back at the fuel tank. We parked the Cherokee and forgot about it until the next morning. While it was warming up we decided the check for fuel leaks. Beneath the engine it looked like the fuel pump was pumping gas directly on the ground with none getting to the cylinders! We killed the engine immediately! The new O-rings had quit working.

If you’re not comfortable working with the fuel system—and you should be extremely competent because of the gas’s volatility—find a good shop in your area with experienced and competent techs. If you are okay working on the system, first find a good shop manual for the year and model of your Jeep at a local auto parts store (Amazon is a good source, too). Make sure the manual includes good instructions and photos on the fuel injector installation. For instance, we used a Haynes Repair Manual for the Jeep Wrangler, 1987 through 2008, which uses the same 4.0L straight six as the 1990 Cherokee Laredo (the vehicle we used for photography).

To relieve fuel pressure, remove the gas cap. Disconnect the battery’s negative cable. Remove all the accessories from the top of the engine (air cleaner, etc.).

Author’s Note: Exchanging the injectors will be the same for all Jeep 4.0L engines, only the external accessories might be different and/or in different locations.

Although we found that the instructions in our Haynes Repair Manual were very complete and excellent, there were a few steps that we felt were unnecessary. Read through all the instructions a couple times before you begin the procedure, and try to identify each component as it’s mentioned. Do this a few times. Trust me; this will work in your favor later on when you’re deep into the task.

Tag each injector with its number and begin disconnecting vacuum lines and electrical connections.

Summit Racing offers remanufactured fuel injectors and new units for the Jeep 4.0L straight six. Since the XJ is 25 years old—and we’re not trying to restore it back to showroom fresh, but just be able to run the trails and cruise the highways and byways—we chose the remanufactured injectors. SR also offers a full line of Haynes Repair Manuals.

You can see the injector is not seated fully.

After tagging them begin disconnecting the injectors.

Use masking tape and/or indelible ink pen and identify every tube, line and wire before disconnecting them.

Loosen the bolts holding the fuel rail down.

One at a time, disconnect the control wires from the injectors.

Be careful, the older the connectors are, the more brittle them may become.

Notice the number on the injector’s connector.

You have to loosen the fuel lines.

Free up each injector.

Disconnect every line.

Continue to disconnect each piece.

Some components may not be readily seen at first, just carefully keep removing the parts.

A few items will have be removed because they are in the way, not because they are part of the fuel system.

Remove the entire fuel rail as one unit.

Carefully maneuver the frame rail around any obstacles.

Thoroughly clean each component that you’ve removed.

Disconnect the individual fuel injectors from the fuel rail.

Install the new injectors onto the fuel rail.

After cleaning everything thoroughly, carefully reinsert the fuel rail with the injectors onboard back into place.

Insert all six injectors into place and begin securing everything back into place.

Everything is back in place and ready for the air cleaner.

Worn injectors can cause performance to fall off so gradually you’ll not notice it. But new injectors are apparent immediately.

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Jeep 4 hole fuel Injector upgrade 4.0

2007 Jeep Grand Cherokee - Fuel Injector

Your fuel injectors atomize the gasoline from your fuel pump to be mixed with air for combustion. Nearly all modern cars since the 1980's are equipped with fuel injection systems. Your engine will have one fuel injector per cylinder, and in most cases, failure may only affect a single injector. Injectors are electronic components and can wear out or suffer from wiring issues, or they can clog over time. Rough idling, starting issues, or increased fuel consumption may signal a bad injector. Injector seals and O-rings can also fail, causing fuel leaks near the top of your engine. O'Reilly Auto Parts carries fuel injectors for most vehicles, and many from OE supplier brands. Shop our selection and find the right fuel injectors for your repair.

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Injector jeep

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Jeep 4 hole fuel Injector upgrade 4.0

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