P0401 1995 Lincoln Town Car

Discussion in 'Domestics' started by Mikerizer, Nov 1, 2009.

  1. Mikerizer

    Mikerizer Quando omni flunkus moritati.

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    1995 Lincoln Town Car Executive, 4.6L, 184,000 miles

    The Check Engine Light is on...I pulled a single code...P0401 Generic, EGR Flow Insufficient.

    What are the most common things I need to check? I'm thinking maybe the EGR port is clogged with crud...any other ideas before I get digging into this?

    THANKS!!
     
  2. jasonn20

    jasonn20 Hero Member

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    I would check for carbon build up first, then use a vacuum gauge to make sure the egr is good, and if all this checks good I would then suspect the DPFE sensor.
     
  3. Mikerizer

    Mikerizer Quando omni flunkus moritati.

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    Will do...thanks! It may be Saturday before I can get to it.

    One more question...I need to replace the ignition lock cylinder. Is this a difficult process? Thanks again.
     
  4. Mikerizer

    Mikerizer Quando omni flunkus moritati.

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    Well, I tried working on this today. I never was able to unhook the exhaust riser pipe from the EGR valve; I can't get a wrench on it, or where it screws into the exhaust manifold. Any ideas there?

    I did, however, remove the throttle body, to inspect the ports from the EGR to the intake. They were clogged completely up. I cleaned them out both the intake and the throttle body. Upon reassembly, I cleared the code and drove the car about 15 miles. The light didn't come back on. However, after the car sat for about 20 minutes, I cranked it back up, and before I backed out of the driveway, the Check Engine light came back on.

    The code now is: P1401 (Ford) EGR Circ High Input. What does this mean, and what should I check now?

    Also, I replaced the ignition cylinder lock...easy-peasy fix there!

    Thanks for your input!!
     
  5. Jim Fairbanks

    Jim Fairbanks wrench

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    Did you happen to unplug the DPFE sensor while you was back there?...Could be unhooked or bad....Jim

    [attachment lost in server move]
     
  6. Mikerizer

    Mikerizer Quando omni flunkus moritati.

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    Brilliant observation, Jim!

    I did have it off, and when I plugged the harness back into it, I didn't push it in far enough for the clip to engage. It was quite a booger to get it on all the way.

    I cleared the codes, and I am driving it to work and back tomorrow; I'll repost the results.

    THANKS!
     
  7. Jim Fairbanks

    Jim Fairbanks wrench

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    Glad you got it fixed...keep us posted....Jim
     
  8. Mikerizer

    Mikerizer Quando omni flunkus moritati.

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    Thanks, Jason and Jim; I'm calling this one fixed!

    I drove it to work and back today, about a 40 mile round trip, and NO CEL!

    The primary culprit was crud buildup in the groove from the EGR valve tube into the intake manifold; the groove is in both the intake and the throttle body.

    The secondary culprit was me; I neglected to securely plug in the lead to the DPFE sensor during reassembly.

    Now all I have to do is some brake work on Saturday, and this one will be ready to sell!

    THANKS BAT!
     

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