Question Asked: engine ping
October 04, 2009, 07:11 PM
have 2001 wrangler with a 4.0. had rebuilt motor put in 1000 miles on it . it has a motor ping. its not ruming hot . has a code 420 in it, scanner shows it runing lean at times. not blowing 02 codes but was thinking bad front 02s or maybe a cooler t stat. also has new water pump and rad.