#Jeep 4.0 ecu tuning how to#
#Jeep 4.0 ecu tuning install#

#Jeep 4.0 ecu tuning install#

Install the hold-down distributor clamp bolt and tighten to 23 Nm (17 ft.

Bolt Down the Distributor and Connect Electrical Components. The rotor should be at the 5 o’clock point, with the rotor blade side lined up with the distributor housing scribe mark (#1 spark plug cable post location). Align the Trailing Edge of the Rotor Blade With the Scribe Mark. Slide the distributor down into the engine block until it seats, keeping the hold-down gear aligned to the hole in the engine block. Ensure the Distributor Sits Properly in the Engine Block.

Afterward, turn the rotor to the 4 o’clock position. Visually line up the distributor housing ear with the clamp hole. Rotate the Rotor to the 4 O’Clock Position. Be sure the distributor gasket is installed. Position the distributor into the engine block hole. Position the Distributor Into the Engine Block. Then, rotate the distributor body until the rotor lines up with a mark exactly 3 cm clockwise from the side of the cam position sensor’s rubber plug – just past the #1 plug wire terminal in a clockwise or advanced direction. If not, remove the bolt from the engine block and pull the distributor out until it rotates freely. Install the Rotor on the Distributor.Ĭheck whether it is near the mark for the #1 plug wire terminal. Rotate the crank pulley another 360 ° should the valve springs appear compressed and the valves open at the end of the exhaust stroke. You can confirm this by ensuring the valve springs on the #1 cylinder are relaxed and the valves closed. When you do this, verify that the #1 piston is at TDC at the end of the compression stroke. Using a 19-mm socket wrench, rotate the crankshaft until the pulley notch lines up with the “0” mark on the timing cover. Line Up the Markings on the Crankshaft Pulley and the Timing Cover. Remove the distributor cap and valve cover so that the valve springs are visible. Note the terminal position for the #1 spark plug wire on the distributor cap and mark it on the distributor body. Following them will tell you if the distributor (view on Amazon) is properly seated and help prevent heat consequences resulting from running the distributor retarded: 1. The following steps cover the distributor removal and installation, regardless if it is undisturbed or not.

#Jeep 4.0 ecu tuning how to#

Having understood that, what this article covers is how to set timing on a 4.0 Jeep by ensuring the correct positioning of the distributor (adjusting the timing chain is a topic reserved for another article). The latter task would require changing the position of the flywheel (view on Amazon) relative to the crank or moving the crank position sensor. However, tinkering with it will not alter ignition timing. Although the ECM does the most when it comes to spark timing, the distributor generates the ignition signal and distributes the same to the proper cylinder. Understanding the role of the distributor is vital in setting your ignition timing correctly.

If you want to keep these incidents to a minimum, continue reading this article.

Bolt down the distributor and connect electrical components.Īn incorrect ignition timing brings with it a slew of issues, such as pre-ignition, hard-starting, bad fuel mileage, power loss, and overall poor performance – inconveniences that are guaranteed to ruin the joy of riding on the prestigious 4×4.

Align the rotor blade trailing edge with the scribe mark.

Ensure the distributor seats properly in the engine block.

Rotate the rotor to the 4 o’clock position.

Position the distributor into the engine block.

Line up the markings on the crankshaft pulley and the timing cover.

Here are the ten steps on how to set timing on a 4.0 Jeep: Your Jeep’s model and the severity of the symptoms encountered will determine if you need to do more or less troubleshooting steps. When setting the timing on a 4.0-L Jeep, position the distributor correctly and align it with the rotor. That said, this guide will cover the steps on setting your Jeep’s ignition timing properly. For Jeep owners, correct ignition timing is essential for proper air-fuel mixture and keeping commutes and off-road adventures hassle-free. Knowing how to set the timing on a 4.0 Jeep is crucial to keeping the vehicle’s ignition timing in synch.