What does the Nutter bypass do?

What does the Nutter bypass do?

Re: what is the nutter bypass? It removes the computers ability to control and adjust the carb. You pretty much run jumper wires from the ICM directly to the distributor.

What kind of engine does a Jeep Wrangler YJ have?

Until 1991, the Wrangler YJ featured 2.5L AMC150 or 4.2L AMC258 engines. The 112hp 4.2L 258 CID straight 6 was replaced by the 180hp 4.0L AMC242 variation. In 1992, the roll cage was increased for shoulder belts at the back. Cable speedos were also replaced with an electronic speedometer.

When did Jeep stop making the Wrangler YJ?

That same year, the manual transmissions slave cylinder changed its position to outside the bell housing of the transmission so that substitutes could be made more easily. In 1995, the larger Dana 30 U-joints were used and the frame and body of the Wrangler YJ were fully galvanized.

What kind of doors does a Jeep Wrangler YJ have?

Top options for YJ were the same as those offered on TJ. A Soft top with “half doors”, featuring soft plastic zipper windows came standard (windows could be removed completely from these doors). Full-frame doors with conventional glass windows were optional on soft-top models.

When did Jeep change the roll cage on the YJ?

The NP207 transfer case was used only for 1987 and replaced by the NP231. In 1988, the Sahara model debuted. The roll cage was extended in 1992 to allow for rear shoulder belts, Also that year, the YJ switched over to an electronic speedometer, outmoding the cable speedos on older YJs.

Until 1991, the Wrangler YJ featured 2.5L AMC150 or 4.2L AMC258 engines. The 112hp 4.2L 258 CID straight 6 was replaced by the 180hp 4.0L AMC242 variation. In 1992, the roll cage was increased for shoulder belts at the back. Cable speedos were also replaced with an electronic speedometer.

That same year, the manual transmissions slave cylinder changed its position to outside the bell housing of the transmission so that substitutes could be made more easily. In 1995, the larger Dana 30 U-joints were used and the frame and body of the Wrangler YJ were fully galvanized.

Top options for YJ were the same as those offered on TJ. A Soft top with “half doors”, featuring soft plastic zipper windows came standard (windows could be removed completely from these doors). Full-frame doors with conventional glass windows were optional on soft-top models.

The NP207 transfer case was used only for 1987 and replaced by the NP231. In 1988, the Sahara model debuted. The roll cage was extended in 1992 to allow for rear shoulder belts, Also that year, the YJ switched over to an electronic speedometer, outmoding the cable speedos on older YJs.

What does the nutter bypass do?

What does the nutter bypass do?

Re: what is the nutter bypass? It removes the computers ability to control and adjust the carb. You pretty much run jumper wires from the ICM directly to the distributor.

What is the jeep nutter bypass?

The Nutter bypass cuts out all of your emissions on the YJ and is for “offroad rigs only”. Oh and don’t get a Weber they are a pain. Go with a Motorcraft 2100, a bit less and way more reliable. Here is the write up about the Nutter explaining it! Nutter write up.

What is a Carter BBD carburetor?

The Carter BBD is a two barrel carburetor that was available on late 70s to late 80s Jeeps with the 4.2L engine. There are two variations of the carburetor, one is computer controlled and has a stepper motor on the back side. The computer controlled version was used after 1981.

How do you adjust Carter BBD?

Another way:

  1. Bring the engine to operation temperature.
  2. Adjust the idle to manufactures specifications.
  3. Turn both idle mixture screws out 1/2 turn.
  4. Alternating between the screw turn in 1/4 turn at a time. Give the engine a second to catch up.
  5. When the rpm starts to drop, turn the screw back 1/4 turn and leave it there.

How do you tune a carter carburetor?

How to Adjust the Mixture on a Carter AFB

  1. Turn the engine on and allow it to warm up.
  2. Locate the two large slothead screws at the bottom of the front of the carburetor.
  3. Turn one air/fuel mixture screw in a clockwise direction with a slothead screwdriver with the engine idling until the engine speeds up.

How much torque does a nutter bypass engine have?

It also has a bit more power below 3000 RPM and the low end torque is definitely stronger at 600 RPM than it used to be. I idled up a fairly steep driveway in 1st gear high range and it went down to 400 RPM and kept pulling, before the conversion the engine always died when I did this in this driveway.

How does the Nutter bypass work on a CJ?

This modification will do two things. It will rewire the ignition wiring to be basically the same as that found in an ’78 to ’82 CJ (with the 258 engine, but without the computer controlled version of the Carter BBD carburetor) and it will make the stock carburetor with its computer controlled stepper motor work with the rewired ignition.

Can you replace stepper motor on Nutter bypass?

The plug stays disconnected from now on. An alternative to steps 1 and 2 is to remove the stepper motor from the back of the carburetor and fully extend the needles. Replace the stepper motor while being careful to not push the needles into the body of the stepper motor.

Where is the purple wire in the Nutter bypass?

Cut the purple wire here as well . There is no purple wire coming out from the plug near the ignition module, so you will have to add a section of wire.

It also has a bit more power below 3000 RPM and the low end torque is definitely stronger at 600 RPM than it used to be. I idled up a fairly steep driveway in 1st gear high range and it went down to 400 RPM and kept pulling, before the conversion the engine always died when I did this in this driveway.

This modification will do two things. It will rewire the ignition wiring to be basically the same as that found in an ’78 to ’82 CJ (with the 258 engine, but without the computer controlled version of the Carter BBD carburetor) and it will make the stock carburetor with its computer controlled stepper motor work with the rewired ignition.

The plug stays disconnected from now on. An alternative to steps 1 and 2 is to remove the stepper motor from the back of the carburetor and fully extend the needles. Replace the stepper motor while being careful to not push the needles into the body of the stepper motor.

Cut the purple wire here as well . There is no purple wire coming out from the plug near the ignition module, so you will have to add a section of wire.

Posted In Q&A