Oh P-0174 WHY will you not go away??

[vigman]

The truck 98 2wd expedition 188K on the clock.
Intake was changed prior to my ownership to the aluminum one YEAH!
The top end was " rebuilt " prior to ownership. The evidence are receipts and FRESH gaskets. Was a Texas truck now California truck so not a rust bucket.. and every electrical connector I have pulled to date doesn't have corrosion in it.

The truck has LOTS of power only a SUPER slight miss at idle W/O ac on ( since the idle is lower ) Codes thrown or not.

Since I have owned the truck this " code "' has popped up at random.. it USED to be on both sides ( Bank 1 & 2 ) but I replaced some vac lines on the vac valves behind the battery that were WAY crunchy. that stopped the bank 1 codes.

Yesterday we replaced the line that goes behind the intake ( engine centerline ) to the pass side PCV and all that multiple 90 deg rubber stuff ( FORD WTH were you thinking when you " designed " that) ? So 1 LITTLE problem I assume the vac port on the rear of the intake is a different OD ( Plastic VS aluminum ) the the O.E. ford " kit " coupler was to large. Not a problem.. on the HELP rack at the local auto parts store is a similar 90 degree fitting for a Chrysler which with a little " magic " ( shrink tube & wire hose clamp ) is BETTER than OE.

Now I know MOST of this is Pass side .. but based on the amount of CRACKAGE on the intake manifold rubber POS fitting that it would help.

BBZZZTTTT Wrongo… after 4 starts the code was tossed.

Observational note.. If I start the truck ( cold morning ) take a long drive 10 miles or more.. let the truck sit for 40 min ( truck is cool again ) and restart, odds are good that the code will not show up.

Hot day running errands… go 2 miles stop , restart, do it again 80% chance I will get a code..

But SOMETIMES it will go for WEEKS with no codes.

If I look at the code scanner there are 4 entries that I think are fuel related
one of the 4 doesn't MOVE ( I'll post a pix later )

So today Drivers side PCV and hose.PLUS close inspection of anything I have missed to date.

BADA BOOM!

Mike

( any thoughts would be appreciated )

 

[JUST4FUN]

Clean MAF ,old fuel filter,or vacuum leak, unmeterd air getting passed the MAF.

 

[Bedrck47]

P0174 - System to Lean (Bank 2)

The Adaptive Fuel Strategy continuously monitors the fuel delivery hardware. The test fails when the adaptive fuel tables reach a rich calibrated limit.

See Possible Causes for DTC P0171.


For lean and rich DTCs:
Fuel system
Excessive fuel pressure.
Leaking/contaminated fuel injectors.
Leaking fuel pressure regulator.
Low fuel pressure or running out of fuel.
Vapor recovery system.
Induction system:
Air leaks after the MAF.
Vacuum Leaks.
PCV system.
Improperly seated engine oil dipstick.
EGR system:
Leaking gasket.
Stuck EGR valve.
Leaking diaphragm or EVR.
Base Engine:
Oil overfill.
Cam timing.
Cylinder compression.
Exhaust leaks before or near the HO2Ss.

 

[vigman]

FPR diaphram , no vac leak.
Dip stick tube AOK
did a wee more inspection and a bit O extra clamping.
Is there support be a hose clamp on the back of the accordion tube ( post MAF ) before it takes the 90 into the throttle body.. LOOKS like there should be…
So we will give it another go … fails again fuel filter

 

[Bedrck47]

check the dpfe sensor hoses
possibly a bad dpfe sensor

http://www.expeditionforum.com/f42/about-egr-pcv-dpff-evap-iat-tps-maf-23583/#post191356

 

[vigman]

DPFE ??????

Well today I took her out mid day on a series of variables that SHOULD have made the check engine light trip... It didn't.. it KNOWS I'm watching....

 

[Bedrck47]

check the link and that will explain what the DPFE does

 

[vigman]

Day 3 after simple clamping ( see above ) and a extensive maf wire cleaning.... The code has not returned.... Fingers crossed.

 

[vigman]

Changed fuel filter today.... OE filter, about 40K worth staining on outside....
Lots of BLACK DEATH coming out the back.......All I can say is it NEEDED IT!