Casflynn
Member
Wanted to share some info. 17 Limited with 20k. Has been cold as he*l here in PA lately and I started to notice a rough idle on cold start. I could feel it in the steering wheel and “see” it when I looked the engine, wife says she didn’t notice anything. So I thought maybe I was over thinking things, but me being me, new plugs (motorcraft 534, gap 30) and new coil boots. Plugs looked ok, little carboned up, not awful, gaps between 32 and 36. No change in idle. Then did a PCM reset and went through the idle relearn process, cleaned all 3 sensors, air temp, boost before throttle body, intake pressure (this one was a little oily), also filled up with a fresh tank of 91( top tier). Idled much better. So not sure if it was plugs, the relearn, the gas, map sensor, or a combo of all four. Just wanted to pass it along. Also if you are an over maintenance guy, I recommmed plugs maybe every 30 after seeing these at 20. Also plan on hitting the intake pressure sensor every oil change from now on. Cheers