On 50-State equipped 2000 and 2001 Jeep Cherokees, Heat Soak is a somewhat prevalent issue especially in warmer climates. If your engine runs rough on warm starts, you have a random cylinder 3 misfire code, or it fails to even stay running after recently being shut down, here are a handful of methods to fix the problem.
This video was inspired by D&E in the garage: https://www.youtube.com/watch?v=lUCr_QCuwE0&t=263s
Time Delay Relay: https://www.qualitymobilevideo.com/discontinued-beuler-bu508td-12-vdc-automotive-4-pin-spst-time-delay-relay-with-adjustable-timing.html
Relay Block: https://www.qualitymobilevideo.com/brs14e.html
I used 12G wire for the fan, and 18G wire for the toggle circuit.
Heat Shield kit: https://www.summitracing.com/parts/dei-010378?seid=srese2
Manual Swap: https://youtu.be/h138NSGFI7o
The 2000+ XJs can run on E-15 fuel, but they don't really like it.
They very much prefer unleaded 87 with NO ETHANOL, but I rarely find stations that sell it.
Dual Catalyst Manifold downpipe options: https://www.rockauto.com/en/catalog/jeep,2001,cherokee,4.0l+l6,1373666,exhaust+&+emission,catalytic+converter,5808
FACTORY EXISTING FAN CIRCUIT INFORMATION:
F141 12LG/RD - FUSED B(+) (Fuse 5) - Constant Power
F20 18WT (2) - FUSED IGNITION SWITCH OUTPUT - Trigger (Ignition ON)
C27 18DB/PK - RADIATOR FAN RELAY CONTROL - Trigger (ECM Ground)
C25 12LB - RADIATOR FAN RELAY OUTPUT - Power to Fan
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