2001 expedition p0171 p0174 WITH LONG CRANKING TIME

Discussion in '1st Gen - 1997 - 2002' started by n.shift, Dec 1, 2017.


  1. 01expy4x4

    01expy4x4 Member

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    Was that right after start up. Will also tell you mine was throwing the same codes with the problem. I had no vacuum leak. Everything you are experiencing is the same as I was. That's why I am expecting it to be the same problem. But I could be wrong
     
  2. DF5.4

    DF5.4 Full Access Members

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    My 07 had the same symptoms and codes. It was the fuel pump assembly. The regulator in the assembly was bad. Check your fuel pressure at the rail.
     
  3. silverexp

    silverexp Member

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    Don't over think it. They were thrown at idle, but that could be because that's when your engine went into closed loop mode and started taking readings from the oxygen sensors. Lean conditions while running at operating temp are either a vacuum leak or restricted fuel supply. Fuel filter clogging can cause long starts AND lean conditions. BTW I also had good fuel pressure before changing the fuel filter.

    Just so you know, my experience with my expy is extensive. I recently had the engine and transmission out. The straw that broke the camels back that made me decide to do it was.....intermittent long starts. Long story short, I overhauled the tranny, changed all engine gaskets, cleaned throttle body, egr, and iac, replaced intake manifold, changed spark plugs, changed a hose or 2, and changed timing set. None of that fixed the intermittent long start. It was just the fuel filter. Moral of the story: don't over think it. Simple stuff first.
     
  4. DF5.4

    DF5.4 Full Access Members

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    Lean codes means either too much air or not enough fuel. The other thing the shop told me was the fuel pump driver module could be bad. Mine didn't have one but they are mounted to the frame and take a beating.


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  5. silverexp

    silverexp Member

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    Exactly. Just don't go sinking $$$ while overlooking a $14 fuel filter
     
  6. rjdelp7

    rjdelp7 Full Access Members

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    I had a Lincoln Town Car(4.6l) do the same thing. It would take sometimes, 4 tries to start, when cold. It ran fine the rest of the time. It was the fuel pump. There is a check ball that holds pressure, in fuel line. It failed and fuel was draining back to tank. Find your fuel rail. There is a service cap with a Schrader valve. Let vehicle sit over night. Take a screwdriver and bleed some fuel out. It should spray out, with a little back pressure(beware). Mine was bone dry. After finally starting, I checked and sure enough, had built up pressure. I think it may of had something to do with Ethanol, in fuel and being run down to almost empty(by previous owner).
     
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  7. Mike Rush

    Mike Rush New Member

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    Clean throttle body and maf sensor helps with long crank to start
     
  8. laffinguy

    laffinguy New Member

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    I got the exact same two codes, and it was a $0 simple fix, so fingers crossed this helps you. If you have changed coils or spark plugs recently, or worked around the driver side of your engine, its is really easy to accidently disconnect a vacuum hose off of your DIFFERENTIAL PRESSURE FEEDBACK EGR SENSOR. There are 2 vacuum tubes that hang from the bottom of this sensor and the slightest amount of pressure from your hand, tool, or part will disconnect one or both of these hoses. This sensor hides toward the top of the engine maybe a foot from the firewall, so its hard to find. But finding the hoses are easier as they tend to drape over the driver side valve cover. If either of those hoses is disconnected that's your problem. If one is loose it's connection is located beside the other hose connector. Good luck.
     
  9. docraymund

    docraymund Full Access Members

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    Check your long term fuel trim again. If it is a vacuum leak, increasing the engine rpm would bring the values down because of the increased air flow. If it didn't go down, that means it's not a vacuum leak but a fuel delivery issue.
     

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