Engine Performance problem
2000 Nissan Xterra 6 cyl Two Wheel Drive Automatic
My xterra runs terrible (cant make it up hills) after warm up. At first I thought it was a clogged fuel filter because it was behaving like it was starved for fuel. I replaced the feul filter then the cap, plugs, and plug-wires. Still runs really rough after warm upl
I had a similar problem. Truck would misfire and rough idle after engine was warm. Same knock sensor code.
I had a distributor bearing that failed in the distributor rotor. When engine was cool, the rotor was moving in all the thick grease so no problem. Once engine warmed up, the grease thinned out and truck was surging, cutting off, rough idle, extreme heat in exhaust.
Mechanic said the rotor looked like a rats nest of metal shavings from the failed bearings and washer.
Replaced distributor cap, distributor rotor, spark plugs, and wired. ($1100 total) Now I need to replace the valve cover gaskets since the intense heat melted the gasket and is causing a minor oil leak.
Heat was caused from the misfiring, which opened the injectors, causing them to dump huge loads of fuel into the cylinder. All that gas caused the temperature to skyrocket. Fortunately, I did not ruin the Cat converters with the heat.