10-15-2016, 01:54 AM
is fuel pressure at spec.
if low, or a stuck open PFR
the engine goes lean, no matter what maf does.
the low pressure, causes low injection rates
and the ECU can not see those, no sensor on pressure until far far in the future.
so that is your job checking this first
i do that at the first sign of LEAN.
sure clean the maf.
also make sure the 02 swings at cruise. and at idle
if the 02 cant hold closed loop at idle, i fix this NOW. I find out why with more tests.
hope this helps you and others. good day and happy Holloween.
if low, or a stuck open PFR
the engine goes lean, no matter what maf does.
the low pressure, causes low injection rates
and the ECU can not see those, no sensor on pressure until far far in the future.
so that is your job checking this first
i do that at the first sign of LEAN.
sure clean the maf.
also make sure the 02 swings at cruise. and at idle
if the 02 cant hold closed loop at idle, i fix this NOW. I find out why with more tests.
hope this helps you and others. good day and happy Holloween.
http://www.fixkick.com