Jeep Wrangler JK: How to Clean Throttle Body

A dirty throttle body will cause a delayed throttle response, hard pedal feel, and a rough idle. This article will assist you in cleaning the throttle body in the Jeep Wrangler.By Bassem Girgis – November 16, 2015

This article applies to the Jeep Wrangler JK (2007-Present).

The throttle body in your Jeep Wrangler controls the air to fuel mixture. The dirtier it gets, the more constricting it becomes. A dirty throttle body will affect your throttle response. You can also diagnose a dirty throttle body by how rough your Jeep is idling, again, because of how constricting the dirt and debris is. Cleaning it solves all of these problems almost immediately. You will need to remove a few components to clean it, but the results are well worth the time you will invest in it. Read on to learn how you can clean your Jeep Wrangler’s throttle body.

Figure 1. Throttle body.

Materials Needed

  • Wrench
  • Torx screwdriver
  • Flat head screwdriver
  • Throttle body cleaner

Step 1 – Disconnect battery

Disconnect the negative (black) battery cable. Simply use your wrench to loosen the nut, then pull it up and wrap it in a towel to avoid any contact with metal.

Figure 2. Disconnect negative battery terminal.

Step 2 – Remove intake tube

To reveal the throttle body, you will need to remove the intake tube attached to it. First, remove the temperature sensor by sliding the red tab back, and then pulling it out. Then, use your screwdriver to loosen the screw on the clamp around the intake tube attaching it to the throttle body and remove the intake tube. You can either push it aside now, or you can loosen the screw on the other side by the air box and remove the tube completely out of the way.

Figure 3. Disconnect temp sensor.

Figure 4. Remove intake tube.

Step 3 – Remove throttle body

Remove the four Torx screws holding the throttle body in place, and then pull the throttle body out.

Figure 5. Remove throttle body.

Step 4 – Clean throttle body

Use throttle body cleaner (or Sea Foam) to spray the assembly, then watch all the dirt and debris slide off. Spray it and wipe it as needed until you feel it looks clean.

Figure 6. Dirty throttle body.

Figure 7. Clean throttle body.

Step 5 – Install throttle body

Installation is the reversal of removal.

Simply align the throttle body in place, then tighten the four Torx screws to hold it in place. Attach the intake tube to the throttle body and the air box, tightening both clamps’ screws. Connect the temp sensor and connect the negative battery cable.

Figure 8. Throttle body installed.

Related Discussion

Jeep Wrangler JK: How to Check Engine Codes

The Jeep Wrangler is equipped with a computer designed to point out the faulty components. This guide will help you understand how to check for engine codes.By Bassem Girgis – November 16, 2015

This article applies to the Jeep Wrangler JK (2007-Present).

Your Jeep Wrangler has tons of components that play a role in making it the car that you drive today. Almost all of the little components are wires to sensors, so when they go bad, it notifies your Jeep’s computer and the computer notifies you with a code. The folks that designed the Jeep made it even easier; now you can check for engine codes without even using an OBD-II scanner. This articles will go over the sequence to get your car to tell you what’s wrong with it. Read on to learn how to check for engine codes in the Jeep Wrangler.

Figure 1. Engine code on instrumental panel.

Materials Needed

  • No tools needed

Step 1 – Understand how to read codes

The engine codes are made out of five digits.

The first digit is a letter. You may have one of four letter: B (body), C (chassis), P (powertrain), or U (network).

The second digit will be either a 0 (SAE) or a 1 (MFG).

The third digit indicates one of eight things: 1 (fuel and air metering), 2 (fuel and air metering injector circuit), 3 (injection systems or misfire), 4 (auxiliary emissions control), 5 (vehicle speed control and idle control system), 7 and 8 (transmission).

The last two digits indicates the faults, which can go from 00 to 99.

Step 2 – Turn key to ON position

Insert your key into the ignition and turn it to the ON position, but don’t start the car. Push the key into the ignition and turn it to the OFF position, while holding it in. Then turn it back to the ON position. Repeat this process three times in a row and stop on the ON position on the third time.

Figure 2. Turn the ignition from ON to OFF three times, while pressing it inside.

Step 3 – Read the code

When and if you do Step 2 successfully, the dash light will turn on and off, then a code will appear. Take a note of that code. However, if you get a massage that says “done,” it means you have no codes to read. If nothing happens after Step 2, repeat it and be sure you are not waiting too long between turning the ignition on and off.

Figure 3. Engine code.

Pro Tip

To check the code, visit Wayalife or Quadratec sites. They offer a full list of codes for the Jeep Wrangler.

Related Discussions

Jeep Wrangler JK: How to Reset Your ECU

If you have just installed some performance mods but your Jeep hasn’t responded yet, you may need to reset your ECU.By Jeffrey Smith – November 13, 2015

This article applies to the Jeep Wrangler JK (2007-Present).

So you have spent a small fortune on various performance modifications, but haven’t seen the results of your efforts yet? It is likely that your engine’s computer hasn’t yet adjusted to the new parts and is still trying to run with the existing OEM settings. This can be frustrating and really annoying. There is a simple fix for this. Your engine’s settings for such things as fuel to air ratios are automatically set at the factory for optimum stock performance. When you add new enhancements to such systems, the computer needs to make adjustments as well, and it sometimes needs a kick in the pants to get it in gear. Fortunately for you, this is a simple, no-special-tools-required procedure that will only take a matter of minutes to perform. Once you have performed this procedure, your Jeep may take up to about 50 warm-up periods (give or take) for the computer to learn the new optimum settings. The results of all your hard work should soon come to fruition.

Materials Needed

  • 8mm wrench to remove battery cables
  • Key

Step 1 – Remove the positive (red) battery cable

Use your wrench or ratchet to remove the positive battery cable. Only remove the positive cable. Leave the negative cable in tact.

Figure 1. Remove the positive (red) battery terminal only.

Step 2 – Ground the red cable to the negative terminal

Ground the positive battery cable to the negative battery terminal for about 30 seconds. Alternatively, you could also first disconnect the negative cable and move it well out of the way, then disconnect the positive cable and ground it to the metal frame for about 30 seconds as well. Either method should work.

Figure 2. Either ground the red to the black, or disconnect both and ground the red to a metal part of the frame.

Step 3 – Reconnect the positive battery cable

If you only disconnected the red cable and ground it to the black, reconnect the red cable now. If you used the alternative method, reconnect the positive first before reconnecting the negative cable.

Figure 3. Regardless of which method you use, always connect the positive cable first.

Step 4 – Turn on your Jeep

  • Insert your key into the ignition.
  • Turn the key to the “ON” position.
  • Do NOT start the engine.

Figure 4. Insert the key and turn it to the “ON” position only. Do not start your Jeep.

Step 5 – Cycle the headlights

With the key in the “ON” position, turn your headlights on and then off again.

Figure 5. Turn your headlights on and then off.

Step 6 – Turn the key off and remove

After you have cycled your headlights, turn the key off. The ECU has now been factory reset. It will take approximately 50 warm-up periods or driving cycles to re-learn the new optimal engine performance settings, and you should see all the modifications that you have made in full swing.

Figure 6. It will take up to 50 driving periods for the ECU to figure out the new performance settings.

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