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Discuss 2001 Cadillac DeVille with Multiple Misfires in the alt.autos.gm forum at Car Dealer Forums; This engine was running flawlessly. On a fairly long highway trip, it started to misfire. ...
  1. #1
    frank1492
    Guest

    Default 2001 Cadillac DeVille with Multiple Misfires

    This engine was running flawlessly. On a fairly long
    highway trip, it started to misfire. By the end of the
    trip I am pretty sure that there were two or more
    cylinders misfiring. Please note that I had never
    experienced *any* misfires before this event. I
    want to make this clear because I think this
    diminishes the likelihood that plugs are involved,
    although the plugs have not been changed in
    some time.
    Plugs are very expensive to change in this
    car and only the dealer will change them. As
    the car has 150K miles on it and has other
    non-engine problems, I am trying to avoid
    spending money needlessly. If possible, I
    would like to examine all the less expensive
    possibilities first, ruling out everything but the
    plugs before I "bite the bullet." (Around $400.)
    Could someone list all the other possibilities
    that might be making this engine misfire on
    multiple cylinders, and that could cause this
    to occur suddenly?
    Many thanks for your help!
    Frank





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  2. #2
    Mike Marlow
    Guest

    Default Re: 2001 Cadillac DeVille with Multiple Misfires


    "frank1492" <frank1492@verizon.net> wrote in message
    news:g96sr21cr8nca9nhdr8gvup3ms97nml9ku@4ax.com...

    > Could someone list all the other possibilities
    > that might be making this engine misfire on
    > multiple cylinders, and that could cause this
    > to occur suddenly?


    Bad fuel, dirty fuel filter, water in the fuel, faulty coils, faulty wires,
    lots of other faulty things. Have you had the engine scanned for fault
    codes yet? Did the Check Engine light come on?

    You are far better off getting the car scanned for codes before you go
    wandering down the paths of everything else that could cause a misfire.
    You'll just be throwing good money after bad if you start shotgunning this
    problem. A lot of aftermarket auto parts stores will scan a car for no
    charge. Go to Auto Zone or another local store and see if they'll scan it
    and give you the codes. At that point you have something substantial to
    start with.

    --

    -Mike-
    mmarlowREMOVE@alltel.net



  3. #3
    frank1492
    Guest

    Default Re: 2001 Cadillac DeVille with Multiple Misfires

    Here's what the AutoZone got:
    Code 300- Random Cylinder Misfire
    Code 440- Evaporative Emission Control (Known problem- Gas Cap)
    Codes 1359, 1360- Ignition system

    The AZ guy said probably the coil or the ignition module since
    misfires are random.

    The "Service Engine Soon" light is always on.

    Your thoughts?












    On Mon, 29 Jan 2007 11:47:11 -0500, "Mike Marlow" <mmarlow@alltel.net>
    wrote:

    >
    >"frank1492" <frank1492@verizon.net> wrote in message
    >news:g96sr21cr8nca9nhdr8gvup3ms97nml9ku@4ax.com.. .
    >
    >> Could someone list all the other possibilities
    >> that might be making this engine misfire on
    >> multiple cylinders, and that could cause this
    >> to occur suddenly?

    >
    >Bad fuel, dirty fuel filter, water in the fuel, faulty coils, faulty wires,
    >lots of other faulty things. Have you had the engine scanned for fault
    >codes yet? Did the Check Engine light come on?
    >
    >You are far better off getting the car scanned for codes before you go
    >wandering down the paths of everything else that could cause a misfire.
    >You'll just be throwing good money after bad if you start shotgunning this
    >problem. A lot of aftermarket auto parts stores will scan a car for no
    >charge. Go to Auto Zone or another local store and see if they'll scan it
    >and give you the codes. At that point you have something substantial to
    >start with.



  4. #4
    frank1492
    Guest

    Default Re: 2001 Cadillac DeVille with Multiple Misfires

    I'm sorry that was "random MULTIPLE misfires."

  5. #5
    Tim
    Guest

    Default Re: 2001 Cadillac DeVille with Multiple Misfires

    Son in law had a caddy that did the same thing. He changed the plugs and
    wires but still miss fired. He had AutoZone did a scan and said fuel
    injectors. he then took it to a shop and had new injectors installed, that
    did not help. Someone said it was the chip in the computer.

    He never did fix it because of the cost he sold the car.



    "frank1492" <frank1492@verizon.net> wrote in message
    news:g96sr21cr8nca9nhdr8gvup3ms97nml9ku@4ax.com...
    > This engine was running flawlessly. On a fairly long
    > highway trip, it started to misfire. By the end of the
    > trip I am pretty sure that there were two or more
    > cylinders misfiring. Please note that I had never
    > experienced *any* misfires before this event. I
    > want to make this clear because I think this
    > diminishes the likelihood that plugs are involved,
    > although the plugs have not been changed in
    > some time.
    > Plugs are very expensive to change in this
    > car and only the dealer will change them. As
    > the car has 150K miles on it and has other
    > non-engine problems, I am trying to avoid
    > spending money needlessly. If possible, I
    > would like to examine all the less expensive
    > possibilities first, ruling out everything but the
    > plugs before I "bite the bullet." (Around $400.)
    > Could someone list all the other possibilities
    > that might be making this engine misfire on
    > multiple cylinders, and that could cause this
    > to occur suddenly?
    > Many thanks for your help!
    > Frank
    >
    >




  6. #6
    Mike Marlow
    Guest

    Default Re: 2001 Cadillac DeVille with Multiple Misfires


    "frank1492" <frank1492@verizon.net> wrote in message
    news:jdnsr2544jkrj6d3rplf10egqkguietear@4ax.com...
    > Here's what the AutoZone got:
    > Code 300- Random Cylinder Misfire
    > Code 440- Evaporative Emission Control (Known problem- Gas Cap)
    > Codes 1359, 1360- Ignition system
    >
    > The AZ guy said probably the coil or the ignition module since
    > misfires are random.
    >
    > The "Service Engine Soon" light is always on.
    >
    > Your thoughts?
    >
    >


    First off - is the gas cap on properly - cranked for two or three clicks?
    The emissions system watches for proper pressure in the gas tank and sets
    the CEL if the cap is not proplerly sealed.

    It can take several (a dozen or more) engine starts/stops to clear the CEL
    if it was caused by a gas cap that was not properly sealed. Or, it may take
    50 miles of driving. Check that and see what happens.

    If it's an ignition problem you are better off getting it scoped. You can
    try pulling a plug wire, but that is not a good indication of whether a coil
    pack is working or not. In short, you're not likely to find a difinitive
    quick fix.

    I will leave it to some of the other guys who may have seen some of these
    codes and determined definitive fixes to comment beyond this. The codes are
    a good starting point and someone may well be able to speak to what you
    have.

    --

    -Mike-
    mmarlowREMOVE@alltel.net



  7. #7
    Mike Marlow
    Guest

    Default Re: 2001 Cadillac DeVille with Multiple Misfires


    "frank1492" <frank1492@verizon.net> wrote in message
    newsvnsr21d1im0qlhfrbr6ioka5dinoc19qr@4ax.com...
    > I'm sorry that was "random MULTIPLE misfires."


    Not likely a coil pack then. More likely a fuel restriction.

    --

    -Mike-
    mmarlowREMOVE@alltel.net



  8. #8
    frank1492
    Guest

    Default Re: 2001 Cadillac DeVille with Multiple Misfires

    The cap issue may go away after more "cycles" but I'm not
    driving the car much these days. This is now a brand new cap with
    certainly at least 3-4 clicks.
    I will call the dealer in the morning. In the past they have been
    pretty honest about the wisdom of doing expensive repairs.
    I will report back here on what they say (or do.)
    Thanks to you both for your helpful comments.
    Frank






    On Mon, 29 Jan 2007 17:37:57 -0500, "Tim" <T&L@askme.net> wrote:

    >Son in law had a caddy that did the same thing. He changed the plugs and
    >wires but still miss fired. He had AutoZone did a scan and said fuel
    >injectors. he then took it to a shop and had new injectors installed, that
    >did not help. Someone said it was the chip in the computer.
    >
    >He never did fix it because of the cost he sold the car.
    >
    >
    >
    >"frank1492" <frank1492@verizon.net> wrote in message
    >news:g96sr21cr8nca9nhdr8gvup3ms97nml9ku@4ax.com.. .
    >> This engine was running flawlessly. On a fairly long
    >> highway trip, it started to misfire. By the end of the
    >> trip I am pretty sure that there were two or more
    >> cylinders misfiring. Please note that I had never
    >> experienced *any* misfires before this event. I
    >> want to make this clear because I think this
    >> diminishes the likelihood that plugs are involved,
    >> although the plugs have not been changed in
    >> some time.
    >> Plugs are very expensive to change in this
    >> car and only the dealer will change them. As
    >> the car has 150K miles on it and has other
    >> non-engine problems, I am trying to avoid
    >> spending money needlessly. If possible, I
    >> would like to examine all the less expensive
    >> possibilities first, ruling out everything but the
    >> plugs before I "bite the bullet." (Around $400.)
    >> Could someone list all the other possibilities
    >> that might be making this engine misfire on
    >> multiple cylinders, and that could cause this
    >> to occur suddenly?
    >> Many thanks for your help!
    >> Frank
    >>
    >>

    >



  9. #9
    frank1492
    Guest

    Default Re: 2001 Cadillac DeVille with Multiple Misfires

    It was the coil, according to the dealership. They are
    replacing it at about $465 + $100 diagnostic.
    Thanks again for eveyone's help!
    Frank







    On Tue, 30 Jan 2007 00:37:00 GMT, frank1492 <frank1492@verizon.net>
    wrote:

    >The cap issue may go away after more "cycles" but I'm not
    >driving the car much these days. This is now a brand new cap with
    >certainly at least 3-4 clicks.
    > I will call the dealer in the morning. In the past they have been
    >pretty honest about the wisdom of doing expensive repairs.
    > I will report back here on what they say (or do.)
    > Thanks to you both for your helpful comments.
    > Frank
    >
    >
    >
    >
    >
    >
    >On Mon, 29 Jan 2007 17:37:57 -0500, "Tim" <T&L@askme.net> wrote:
    >
    >>Son in law had a caddy that did the same thing. He changed the plugs and
    >>wires but still miss fired. He had AutoZone did a scan and said fuel
    >>injectors. he then took it to a shop and had new injectors installed, that
    >>did not help. Someone said it was the chip in the computer.
    >>
    >>He never did fix it because of the cost he sold the car.
    >>
    >>
    >>
    >>"frank1492" <frank1492@verizon.net> wrote in message
    >>news:g96sr21cr8nca9nhdr8gvup3ms97nml9ku@4ax.com. ..
    >>> This engine was running flawlessly. On a fairly long
    >>> highway trip, it started to misfire. By the end of the
    >>> trip I am pretty sure that there were two or more
    >>> cylinders misfiring. Please note that I had never
    >>> experienced *any* misfires before this event. I
    >>> want to make this clear because I think this
    >>> diminishes the likelihood that plugs are involved,
    >>> although the plugs have not been changed in
    >>> some time.
    >>> Plugs are very expensive to change in this
    >>> car and only the dealer will change them. As
    >>> the car has 150K miles on it and has other
    >>> non-engine problems, I am trying to avoid
    >>> spending money needlessly. If possible, I
    >>> would like to examine all the less expensive
    >>> possibilities first, ruling out everything but the
    >>> plugs before I "bite the bullet." (Around $400.)
    >>> Could someone list all the other possibilities
    >>> that might be making this engine misfire on
    >>> multiple cylinders, and that could cause this
    >>> to occur suddenly?
    >>> Many thanks for your help!
    >>> Frank
    >>>
    >>>

    >>



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