GlassTop09
Senior Member
1 more item to add:
Look at your 2E line on FF data....PCM is not commanding EVAP CPV to open due to fuel tank level being above 85% full (EVAP monitoring is disabled until the fuel tank level gets < 85%) but look at line 32....EVAP system pressure is showing -0.310" H20. This is close but really should not be showing a negative number....should be 0.000" or a positive number so you also may have a potentially leaking EVAP CPV (or VMV if 05-06 MY) on your car's EVAP system (which is another source of a vacuum leak). It is a used car (2007 MY.....13yrs old) & most don't pay this any attention due to the only thing drawing any attention to this is the MIL...……..
Just another example of the power of using that scan tool to find stuff breaking before it can potentially leave you stranded so you can fix stuff proactively instead of reactively reducing the cost of ownership...……...
FYI...……………...
PS--Just looked at the OBDII DTC code listings & the P0171, P0172, P0174 & P0175 DTC's on Ford's 2007 MY OBDII System Summary Sheet all correspond to PCM detected fuel delivery issues....not necessarily vacuum leaks so the P0171 B1 System Too Lean DTC is the PCM detecting a low fuel delivery problem on B1 (FF data showed the problem was also occurring on B2 as well...…common fuel delivery to both banks thru a single fuel line usually found when engine is under a load which the PCM does check for proper fuel delivery to calculated air mass in this scenario...the high +LTFT% numbers relative to the calculated air mass flow indicates a low fuel delivery condition exists). Now a vacuum leak can be involved w\ this DTC (actually pointed 1 out from the FF data) so you do have to account for them.
Just thought I'd post this for anyone interested...……...
Look at your 2E line on FF data....PCM is not commanding EVAP CPV to open due to fuel tank level being above 85% full (EVAP monitoring is disabled until the fuel tank level gets < 85%) but look at line 32....EVAP system pressure is showing -0.310" H20. This is close but really should not be showing a negative number....should be 0.000" or a positive number so you also may have a potentially leaking EVAP CPV (or VMV if 05-06 MY) on your car's EVAP system (which is another source of a vacuum leak). It is a used car (2007 MY.....13yrs old) & most don't pay this any attention due to the only thing drawing any attention to this is the MIL...……..
Just another example of the power of using that scan tool to find stuff breaking before it can potentially leave you stranded so you can fix stuff proactively instead of reactively reducing the cost of ownership...……...
FYI...……………...
PS--Just looked at the OBDII DTC code listings & the P0171, P0172, P0174 & P0175 DTC's on Ford's 2007 MY OBDII System Summary Sheet all correspond to PCM detected fuel delivery issues....not necessarily vacuum leaks so the P0171 B1 System Too Lean DTC is the PCM detecting a low fuel delivery problem on B1 (FF data showed the problem was also occurring on B2 as well...…common fuel delivery to both banks thru a single fuel line usually found when engine is under a load which the PCM does check for proper fuel delivery to calculated air mass in this scenario...the high +LTFT% numbers relative to the calculated air mass flow indicates a low fuel delivery condition exists). Now a vacuum leak can be involved w\ this DTC (actually pointed 1 out from the FF data) so you do have to account for them.
Just thought I'd post this for anyone interested...……...
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