I dont use my truck much mainly for trips and the occasional trailer tow. my truck is about 14 months old and i just turned 10k. the oil has been changed 3 times yes im a bit fanatical oh well any way the truck has an occasional knock at idle in gear the oil pressure appears normal according to the factory guage. could this be an injector? oes anyone know what types of failure thay have been getting with the injectors. how does the scan tool diagnose a bad injector?