The Jeep Wrangler offers a 2.4-liter four-cylinder engine with sequential fuel injection and double overhead cams, and a 4.0-liter SFI six-cylinder engine. The frames have designations reflecting the period dates of manufacturer. These designations are: 1987 to 1995 have the prefix YJ, 1997 to 2006 have the prefix TJ, 2004 to 2006 have the prefix LJ, 2007 to present have the prefix JK, and the military versions have a designation J8.
Instructions
- 1
Open the hood and look at the decal on the radiator support shroud. This decal supplies information as to engine type, engine group, timing, idle rpm and spark plug gap, along with several other items. In the upper left corner of the decal it will give the engine size as a 2.4 or 4.0. The 2.4 liter is the four-cylinder and the 4.0-liter is the six-cylinder engine.
2Inspect the passenger side of the engine. The 4.0-liter engine has six spark plugs plainly visible on the side of the engine.
3Look at the driver's side of the engine. The intake manifold and exhaust manifold are both secured to the engine block by flat clamps shared by both the intake and exhaust. Simply count the number of intake or exhaust runners for a definite identification.
