It's the crank sensor!
Join Date: Nov 2007
Location: Central Minnesota
My understanding is that 2003 and newer are TUPY. I've heard that the stamping is somewhere around cylinders 3 and 4 but that is not confirmed. Maybe somebody with actual knowledge of TUPY will chime in.
Also, I would like to know where Jeep sourced the TUPY head from??
99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!