PGM-FI Waring Light - 1987 Honda Accord LX

Discussion in 'Accord' started by Brian Johnson, Feb 11, 2004.

  1. Issue with PGM-FI warning light started after SMOG Repairs.

    1987 Honda Accord LX with 124k miles

    PGM-FI light comes on consistently after 15 - 30 minutes of driving.
    Usually preceded by some engine stuttering then as soon as the light
    comes on the car drives smoothly. Of course the light resets as soon
    as I turn off the engine.

    The smog repairs included replacement of the O2 sensor and
    re-adjustment of the timing back to specs.

    I checked the LED on the control unit under the driver's seat. There
    is a single LED which is blinking once.

    The smog repair shop is stating that they are unable to reproduce the
    issue and that it is unrelated to the repairs they made. The car was
    running fine just not passing smog before the smog repairs (never had
    the PGM-FI light up while driving before). The PGM-FI light came on as
    I drove the car home from the SMOG Repair Shop after spending $378
    bucks. Now they've had the car for several days with no results and
    have tried to chg me another $75 for diagnostics which I've refused to
    pay. I'm now driving the car for the past 2 weeks with the light
    coming on consistently after 15-30 min usually on the freeway and
    usually preceded by some engine stutter or sluggish acceleration... as
    soon as the light comes on the car runs fine for the rest of my 1 hour
    commute.

    If any one knows what the LED codes are, specifically what blinking
    once indicates please let me know.

    Thanks in advance,
    Brian Johnson
     
    Brian Johnson, Feb 11, 2004
    #1
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  2. here is something that can help you

    http://www3.sympatico.ca/ecutuning/tech/ecucodes.html

    --
    Eric Fournelle
    Alarme-O-Tech
    514-730-5169
    www.alarmeotech.com


    "Brian Johnson" <> wrote in message
    news:...
    > Issue with PGM-FI warning light started after SMOG Repairs.
    >
    > 1987 Honda Accord LX with 124k miles
    >
    > PGM-FI light comes on consistently after 15 - 30 minutes of driving.
    > Usually preceded by some engine stuttering then as soon as the light
    > comes on the car drives smoothly. Of course the light resets as soon
    > as I turn off the engine.
    >
    > The smog repairs included replacement of the O2 sensor and
    > re-adjustment of the timing back to specs.
    >
    > I checked the LED on the control unit under the driver's seat. There
    > is a single LED which is blinking once.
    >
    > The smog repair shop is stating that they are unable to reproduce the
    > issue and that it is unrelated to the repairs they made. The car was
    > running fine just not passing smog before the smog repairs (never had
    > the PGM-FI light up while driving before). The PGM-FI light came on as
    > I drove the car home from the SMOG Repair Shop after spending $378
    > bucks. Now they've had the car for several days with no results and
    > have tried to chg me another $75 for diagnostics which I've refused to
    > pay. I'm now driving the car for the past 2 weeks with the light
    > coming on consistently after 15-30 min usually on the freeway and
    > usually preceded by some engine stutter or sluggish acceleration... as
    > soon as the light comes on the car runs fine for the rest of my 1 hour
    > commute.
    >
    > If any one knows what the LED codes are, specifically what blinking
    > once indicates please let me know.
    >
    > Thanks in advance,
    > Brian Johnson
     
    Alarme-O-Tech, Feb 12, 2004
    #2
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  3. On 11 Feb 2004 13:39:41 -0800, (Brian
    Johnson) wrote:

    >Issue with PGM-FI warning light started after SMOG Repairs.
    >
    >1987 Honda Accord LX with 124k miles
    >
    >PGM-FI light comes on consistently after 15 - 30 minutes of driving.
    >Usually preceded by some engine stuttering then as soon as the light
    >comes on the car drives smoothly. Of course the light resets as soon
    >as I turn off the engine.


    The switch over smooth running after stuttering is the system going "open
    loop", instead of basing engine parameters on exhaust measurement by the O2
    sensor. Its basically a "limp" mode and while it feels OK, since the O2
    sensor is no longer being used to control combustion settings, it *can*
    damage your catalytic converter with clinker if left long enough.

    >The smog repairs included replacement of the O2 sensor and
    >re-adjustment of the timing back to specs.


    O2 sensor is the main suspect here I'd think. There are what's known as
    "Universal" type sensors which rarely work right for long - some of those
    don't even have a connector on the wire(s). Ask the shop which brand and
    type they used. Experience here has been that what works best for Hondas
    is the Honda part which may also be available in aftermarket as an OE type
    but only if it's an exact match, e.g. the identical part made by Denso or
    NTK.

    Rgds, George Macdonald

    "Just because they're paranoid doesn't mean you're not psychotic" - Who, me??
     
    George Macdonald, Feb 13, 2004
    #3
  4. "Brian Johnson" <> wrote in message

    > PGM-FI light comes on consistently after 15 - 30 minutes of driving.
    > Usually preceded by some engine stuttering then as soon as the light
    > comes on the car drives smoothly.


    This probably indicates a ridiculously lean mixture before it entered a
    limp mode (which is noticeable by a powerful smooth drive after.)

    > The smog repair shop is stating that they are unable to reproduce the
    > issue and that it is unrelated to the repairs they made. The car was
    > running fine just not passing smog before the smog repairs (never had
    > the PGM-FI light up while driving before). <snip>


    Car probably ran rich and failed smog before. Now it likely runs
    too lean. Normal O2 should react quickly to changes. Did you
    install one or both? I've installed many BOSH O2 sensors on these
    Hondas and has worked fine. But not all brands should work.

    > car runs fine for the rest of my 1 hour commute.


    Practice caution. Limp mode means limp home. 1 hour
    commute may further damage O2 sensor or catalytic.

    > If any one knows what ..once LED codes are,


    More likely a Faulty Primary Oxygen Sensor.

    Technical stuff: O2 sensor behaves in three voltages. 0.1, 0.4
    and 0.9-volts. Connect analog or DMM to the sensor and
    gradually accelerate. Good sensors try to stay at 0.4-volts
    and jumps to 0.1-volt quickly when gas is released. In your
    case it's probably stuck at 0.9-volts.

    --
    Milo
     
    Indiån §ummer, Feb 13, 2004
    #4
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