2003 Ford Excursion V 10 130k miles
Just started having the first cold start being slow-rough-then catches up to normal. There are no codes. What I do notice is my left and right bank fuel trims oscillate back and forth-rich to lean. The readings, at most have hit between +3.4 and -1.6. I installed a new fuel pump, fuel pump relay, fuel filter as well as cleaned the MAF and Throttle body plates (did not take it off) I have had codes in the past that said:
Fuel sensor A circuit-the fuel level indicator gets stuck at various levels on occasion.
Fuel pump and pressure check out good.
I've put in injector cleaner but awaiting 505 CRF
I have no clue if the 2 noted issues are related-idle on start up and fuel trim levels.
Any ideas?
Well, a classic thing that does that is vacuum leaks. So I'd advise hooking up a smoke machine to the vehicle to try to smoke out the leak. Often it's intake manifold gaskets on those
