redfishtd

Cops ,bad plugs /bad boots must be taken care of too. Because of the high voltage-- possible misses , the computer makes all kinds of adjustments to compensate .
This engine requires it all to be in perfect shape .
VCTs have to work also , if the oil pressure doesn't get thru to the phasors at the right time the computer will know it and compensate . But it should throw codes. Vcts and vct bodies have filters in there that get jammed up . This hydraulic circuit must be clean . Don't stretch out oil changes ,that carbon in that slippery good oil will jam up stuff from normal combustion carbon . It may lube but will block filters /ports .

BadFish523

Yeah but there is also a throttle calibration that can be done as well.

FordBoy05

Just started my truck tonight and when it was idling the check engine light came on. It didn't flash. Any ideas what it could be? It has power and doesn't knock or anything

BadFish523

Gotta pull the codes. Without those it's just purely guessing.

FordBoy05

The codes where P0171 and P0174. System to lean on both banks. Maybe this is why it is idling rough. Maybe a vacuum hose came off?

FordBoy05

Update so this morning the light went out. I did run it low on fuel a couple days ago so maybe that was the cause? Anyways it seems to be idling better now also

FordBoy05

Found the source of the vacuum leak, pcv line drivers side, wasn't clicked in all the way.