Jeep Wrangler Nutter Bypass
I finally decided to do the Jeep Wrangler Nutter Bypass. I can tell you for me it was totally worth it. I am seeing better performance, and easier starts. I can actually use my 5th gear on the highway where it is generally flat even with my 33’s. I decided to create this post so it might help someone out. It can be confusing reading some of the posts by the techies that get into the fine details of the Jeep Wrangler Nutter Bypass. So here are some pictures and a description of the steps involved. This is just for the ignition bypass. I am not going into too many details regarding carburetor adjustments and the like.
Note: Your vehicle may vary slightly, due to Modifications, Different Carburetors etc.. Feel free to contact me and I will be happy to help if I can.
So here is a photo of the Purple and Orange wires that you read about in most posts about the Jeep Wrangler Nutter Bypass. You do not have to do anything here. I am just showing you these wires so you can see where they are located. This is helpful if you want to use a multi-meter to check out the wires and make sure you have the correct pair.
Notice the twisted orange and purple wire.This is where they come out of the wire loom and go down through the firewall.
- You will be cutting them just about where the arrow indicates.
- Cut the orange wire and strip the end.
- Cut the purple wire and strip the end.
- Then cut two lengths of new wire that will reach from your splice to the ignition control module. The ICM is usually located behind the windshield washer tank on the firewall.
- Attach your two new wires to the newly cut and stripped orange and purple wire.
Be sure that you are attaching the wires to the side that comes “FROM” the distributor, “NOT” the wires that go into the firewall.
- Strip the other end of the wires that you just ran to the ICM
- Cut the orange wire at the ICM Connector.
- Strip the end of the orange wire.
- Cut the purple wire at the ICM Connector.
- Strip the end of the purple wire.
- Attach the two wires that you extended earlier.
- Orange to orange.
- Purple to purple.
- Put all your wires back into the loom and tidy up.
Adjust the Timing
- Connect your timing light
- Start the Engine
- Warm up to operating temp
- Turn off Engine
- Loosen the distributor lock nut
- Remove and plug the vacuum line from the distributor
- Start Engine
- Adjust for 8* BTDC
- Stop engine
- Tighten distributor lock nut
- Start engine and check to make sure nothing moved
- Replace Vacuum line to carb
- Stop Engine
Jeep Wrangler Nutter Bypass – Additional Notes
- You want your distributor’s vacuum line connected to ported vacuum not manifold vacuum (Off the carb, not the manifold)
- Adjust your carb’s idle mixture screws for the best lean running setting you can achieve
- Don’t be confused by my photo showing the Ignition control module on the fender. I put it there. It was under the washer fluid reservoir and it was hard to get to.