new to the site help needed

[Tucker914]

so im a long time lurker and just recently became a member. i brought home my first expedition today and it has a major running issue. it wont idle after tryin a couple time it fires up and idles up way high but comes right down to stall unless u feather the gas constantly to keep it at or above 1k. it has 3 codes p1401, p0171, and a p0174. i got it froma buddy who said it just recently started and got pretty bad in a few days so he parked it. it sat for only a couple days. another buddy of mine said his 4.6 stang did the same thing wen the timing chain tensioner went bad. im new to fords so this 5.4 is stmping me would really like to get it running right tho. thanks again for all the help in advance

 

[bedrck46]

What year is it?

 

[bedrck46]

How many miles on it? when were the COP's and plugs last changed?

 

[Tucker914]

cant believe i forgot that its a 99

 

[Tucker914]

Its around 170k odometer works wen it wants. And idk nor did the previous owner

 

[bedrck46]

P0171 - System to Lean (Bank 1)
P0174 - System to Lean (Bank 2)

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

P1401 - DPF EGR Sensor Circuit High Voltage Detected

DPF EGR circuit open
VREF short to PWR
Damaged DPF EGR sensor
DPFEGR circuit short to PWR
SIG RTN circuit open
Damaged PCM

 

[bedrck46]

there is a repair that can be done to the odometer flickering light problem Easy fix takes about an hour Check you tube for videos on that issue

 

[Tucker914]

That's a heck of a list of stuff.... now where to begin lol

 

[bedrck46]

I would start by at least replacing the plugs and if needed the COP's (coils) if you don't put new coils on at least put new boots on with new plugs.

p0171 and p0174 is more likely due to a vacuum leak or egr system related, check the DPFE sensor and the two rubber hoses that connect to the exhaust tube they tend to dry out over time and miles

 

[Tucker914]

I would start by at least replacing the plugs and if needed the COP's (coils) if you don't put new coils on at least put new boots on with new plugs.

p0171 and p0174 is more likely due to a vacuum leak or egr system related, check the DPFE sensor and the two rubber hoses that connect to the exhaust tube they tend to dry out over time and miles

Dpfe? And where is it lol

 

[bedrck46]

if you do your own work I would suggest

Ford workshop manual on DVD. Can be obtained from seller "morpheousking" on e-bay. Cost about $20.00 Much better than Clymer, Haynes or Chilton and also includes wiring diagrams

Don't waste your money on a Clymer, Haynes or Chilton Manual.
It is well worth the $20.00 just make sure you get the DVD for your year as the seller has different DVD's for different years

 

[bedrck46]

If you look at the drivers side exhaust manifold you will see a riser tube that connects to the EGR Valve you will also see two rubber hoses connected to the riser the other ends of those hoses goes to the DPFE sensor.

 

[bedrck46]

check the following link It was posted today and it will be very helpful

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

 

[BAD RONALD]

... lol...

Really?

 

[Tucker914]

Really?

Sorry? Any who I started digging in to her today taking the plugs out which look totally hit gap is way of and they are Bosch platinums and I think the platinum is gone and the not porcelin side is all deformed so new plugs and coils coming but also found a mass vacuum leak. Looks like a big hose straight into the back of the intake that my hands can't reach so after I get that fixed I'll have an update but hopefully it all works out

 

[Lightnig]

...

Looks like a big hose straight into the back of the intake that my hands can't reach so after I get that fixed I'll have an update but hopefully it all works out

Passenger side of the engine, hose running from the cam cover to the back of the intake? Sounds like the EGR valve/hose assembly. Just about the most common cause of the P0171 and P0174 codes.

Rough idle? P0171, P0174? Here's what you need to check first!!!

 

[Tucker914]

hear all this about a 90* elbow in the back of the intake but mine is straight? It has a big side for the intake and wgat looks like 3/8 off the other side any idas why mine would be different?

 

[stamp11127]

Someone may have changed it previously.

 

[Tucker914]

Someone may have changed it previously.

That's possible I suppose but the way the plastic hose lines up wouldn't allow for a 90*

 

[Tucker914]

also what is the technical name of the hase that says gas that goes from the intake to the valve next to the brake booster? mine is all rigged back together and would rather ust gat a new one