JB4 Tuner Install and Tutorial! - Lethal Performance

LethalJoe

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Hey All!

We recently got our hands on another 2021 Bronco First Edition and installed the JB4 Tuner, installed the app, and ran it through a few tests! Now it's onto the Dyno to get some solid data behind it, and we promise, it will NOT disappoint.


All you need for install is...
- The JB4 ( And any accessories you option for)
- Zip Ties - Sharp Knife
- Heavy Duty, Weather Resistant, Double-Sided Tape
- 2.5 MM Allen key (If you have the Wireless Connection Kit)

1. To start, of course disconnect the negative battery terminal.

2. If you have the Wireless Connection Kit, take a 2.5MM Allen Key to remove the cover from the JB4 so you can access the plug for the Bluetooth Adapter.

3. Plug in the connector in and install with the supplied Phillips head screws. Place the cover back down with the allen head bolts and evenly tighten to ensure a good seal.

4. Figure out how you would like to run the OBD2 Data wire from the interior to exterior. (As seen in the video, there is a grommet we simple sliced a small slot in so we could just barely get the plug through and have it seal back up.) Then run the wire through and make sure there is plenty of slack to ensure you have enough wire to mount the JB4 where you would like to.

5. Next, take the TMAP harness off of the TMAP sensor and install the identical JB4 harness to the sensor. Next install the other side to the vehicles harness.

6. Do the same with the MAP Sensor.

7. Find a safe routing for the wiring. (See video for how we routed, but overall, there's a few different options depending on where you want to mount the JB4 Device.)

8. Once you've decided where you would like to mount the JB4, take some weather resistant double-sided tape and stick it to the surface. (We personally attached it to the fuse box but the choice is totally yours!)

9. Mount the Bluetooth Adapter using the same tape. (JB4 recommends not mounting on metal)

10. Plug the OBD2 Harness into the last harness available on the JB4.

11. Install the negative harness back onto the battery terminal.

12. Go for a rip! (Download the JB4 App and run through the dialogs in the app if you have the Wireless Connection Kit) .


As always, if you have any questions, concerns, or want to get one on order, shoot us a call at 561-753-8105 or shoot us an email at [email protected]!


Joe Rocchio / [email protected]
877-2-LETHAL | lethalperformance.com
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