Next the instructions say to remove the fuel lines from the mechanical pump location to just under the driverside of the firewall next to the charcoal canister. I went ahead and tossed these in the trash as well. Make sure before you remove the ines that you mark them in one way to recongize which fuel line is the return fuel line or main pressure fuel line. From here I went ahead and removed the radiator hoses and theromstat housing

The MPI supply's a new thermostat and housing including a required temperature sensor attached in the housing. The new housing was prepped and ready for installation after adding some high temp silicone sealent and gasket. See pictures for detailed pictures.

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INSTALLATION PART 4:

After installing the new thermostat I then went ahead and removed the harmonic dampner using a Crankshaft Puller. For this process removal of the radiator is required to fit the puller on. Then using a breaker-bar I began to slowly tighten the center bolt on the puller. To my surprise with old harmonic dampner came off with no difficulty's. I personally thought this was going to be one of the hardest parts of the installation. I cleaned the surface and placed the new Vibration Dampner in position (serpintine style for my application) These dampners are sold seperatly and are required to complete the MPI conversion. The reason there sold seperatly is because some 4.2L Jeeps had a V-belt style belts and some used serpintine style belts. The new dampner bolted right into position using the existing factory bolt. I then placed my radiator back into its original position. The reason for changing the vibration dampner is to obtain a crankshaft positioning sensor. This sensor and custom mounting bracket is also supplied in the kit. Installation requires removal of three oil pan bolts. I placed the new sensor barcket into position and mounted it using the new hardware. Very easy installation. Took about 5 minutes. the pictures below show the details.

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INSTALLATION PART 5:

After installing the new vibration dampner, I felt one of the hard parts was completed. Now it was time to install the new distributor supplyed in the MPI kit. The kit also includes a set of new Mopar plug wires, I took this opportunity to replace my spark plugs as well. For my project YJ I bought some Bosch platinum +4 plugs. There more expensive but I figured its worth a try.
Before removing the distributor, take the existing distributor cap off and turn the crankshaft untill the both the rotor is pointed to the #1 piston position and the #1 piston is at TDC (TDC=Top Dead Center). Now its time to remove the old distributor, I went ahead and began removing all the plug wires. Then went ahead and removed the complete distributor from the side of the 4.2L block. From here I went ahead and placed the new equipped distributor in position. NOTE: The Mopar kit presets the distributor into the correct position for you. Don't! remove the retaining pin until complete distributor installation is completed and verified. Using the supplyed Mopar plug wires I determined each wire and positioned them as instructed. A Chilton or Haynes repair manual is recomended when attaching the plug wires to the spark plugs to ensure correct firing order. Since the ignition coil has been previously mounted this will concludes the ignition installation. See pictures below for reference.

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