welcome bad from road trip..
-25% means the ECU is removing 25% fuel from a gross over rich mixture.
if it misfires, at all at idle, this sends, excess oxygen air slugs to the exhaust ports, and 02 sees that as lean , oxy lean. and goes huge Plus percent to correct it.
same with exhaust leaks near 02. huge oxy (air 20%) land there and huge + percent LTFT.
so what on earth causes -25%
too high fuel pressure tops my list
leaking injectors. (1 or more)
MAF stuck high,(but under the DTC error stuck high point, nah)
not clogged injectors as LTFT goes +25% to compensate.
its nice having scan tool data, no?
see whats going on with fuel trim... is a very good thing.
so you have zero DTC errors.
-25% means the ECU is removing 25% fuel from a gross over rich mixture.
if it misfires, at all at idle, this sends, excess oxygen air slugs to the exhaust ports, and 02 sees that as lean , oxy lean. and goes huge Plus percent to correct it.
same with exhaust leaks near 02. huge oxy (air 20%) land there and huge + percent LTFT.
so what on earth causes -25%
too high fuel pressure tops my list
leaking injectors. (1 or more)
MAF stuck high,(but under the DTC error stuck high point, nah)
not clogged injectors as LTFT goes +25% to compensate.
its nice having scan tool data, no?
see whats going on with fuel trim... is a very good thing.
so you have zero DTC errors.
http://www.fixkick.com