Jeep Cherokee: Heat Soak & Vapor Lock Explained (Cylinder 3 Misfire, Rough Warm Start) ['00-'01 XJ]

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:    • XJ HEAT SOAK FIXED - Time delay cooling fa...   Time Delay Relay: https://www.qualitymobilevideo.com/di... Relay Block: https://www.qualitymobilevideo.com/br... I used 12G wire for the fan, and 18G wire for the toggle circuit. Heat Shield kit: https://www.summitracing.com/parts/de... Manual Swap:    • Jeep Cherokee: Manual Swap - Everything Yo...   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/j... 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 Up Next: Operation Taco