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Thread: 2001 Ford Focus hesitation

  1. #1
    Steve
    Guest Steve's Avatar

    Default 2001 Ford Focus hesitation

    I am having trouble diagnosing a hesitation in a friend's vehicle and
    could use some help from someone much more experienced than myself.

    It's a 2001 16V Zetec automatic with 165K that has started throwing
    CEL 301 (Cylinder 1 misfire codes). My friend told me that the
    vehicle
    would hesitate at around 40, then proceed up to highway speed then
    throw a CEL.

    I asked her about the history of related repairs and learned the
    following;

    - Replaced coil pack less than 3K ago
    - Replaced fuel filter 3K ago
    - Replaced plugs and wires 1.5K ago
    - Replaced PCV valve 4K ago

    Someone was throwing parts at it to correct this problem, but it
    eventually got worse.

    The vehicle had also been exempt from the dreaded Focus fuel pump
    recall back in 2003. All fuel flow at low speed under load as well as
    high speed seem to be within tolerance. There seems to be no falter
    except at around 40 MPH.

    Since it was still getting worse and there were no local viable
    repair
    options available, I decided to take on the issue. I tested spark at
    cyl 1 and found it to be strong, eliminating the wires and coil. I
    pulled the plug and as a platinum plug, it still looked new. This
    left
    two things, the injector and an internal problem like a valve..

    Without a compression tester (MIA) and the overall smooth operation of
    the
    motor in every other condition, I took the injector route. I pulled
    the fuel rail and replaced the cyl 1 injector with a remanufactured
    one. I also replaced gaskets on the TB and the intake. While I was in
    there, I also replaced the DPFE sensor as I have heard of silly
    readings being fed back to the ECU to create a similar issue with a
    leak somewhere..

    The overall condition from my friend is that things are much smoother
    and better (No CEL's) but she did mention that there is still a
    hesitation at around 40, although less than before.

    My only guess at this point without a shop manual is that there is a
    vacuum leak somewhere. Next I would assume that a vacuum leak could
    cause this,
    but still not sure why at a certain speed range like 40 MPH with AT.

    As I'm at a loss and hate throwing money at parts in hope and find my
    compression
    gauge MIA, but feel very close at this point, I would appreciate any
    advice to help out my
    friend..

    Thanks in advance for your advice and help..

  2. #2
    Steve
    Guest Steve's Avatar

    Default 2001 Ford Focus hesitation


    > Flat spot on the TPS?


    The TPS was smooth and throttle response appears normal. A bit
    difficult to determine with AT and lack of a shop manual..

    Any insight into testing the sensor?

  3. #3
    Tegger
    Guest Tegger's Avatar

    Default 2001 Ford Focus hesitation

    Steve <stearl919@..........> wrote in news:d2f14219-c2c2-432f-95f3-
    25baac2ce497@y35g2000pre..............com:

    > I am having trouble diagnosing a hesitation in a friend's vehicle and
    > could use some help from someone much more experienced than myself.
    >
    > It's a 2001 16V Zetec automatic with 165K that has started throwing
    > CEL 301 (Cylinder 1 misfire codes).


    You must mean P0301.

    Understand that "misfire" does necessarily mean a plug or injector is
    failing to fire. It simply means the the ECM has determined that the
    crankshaft is not being shoved around with the same force for that cylinder
    as it is for the other cylinders.

    - Have you checked for an intake manifold gasket leak?
    - Does the engine have EGR? If so, have you checked to see if any of the
    passages are blocked?
    - Have you checked the valve clearances to see if any have closed up?

    And rather than replacing ignition parts, I would have swapped them to
    other cylinders to see if the misfire code moved with them. That would be
    much cheaper than replacing parts.

    --
    Tegger

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