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Discuss 1997 2.2 chevy cavalier p0300 random misfire fuel injector in the alt.autos.gm forum at Car Dealer Forums; I have a 1997 cavalier showing p0300 random misfire on cyl 1&4. Changed plugs/wires/coil/ICM with ...
  1. #1
    jason.e.carney@gmail.com
    Guest

    Default 1997 2.2 chevy cavalier p0300 random misfire fuel injector

    I have a 1997 cavalier showing p0300 random misfire on cyl 1&4.
    Changed plugs/wires/coil/ICM with no result. Swapped #3 injector for
    #4 and miss followed injector. Swapped 1&2 and 3&4 and it followed the
    injectors again. So now we are missing on 2 & 4.
    I replaced the injectors indicated by the misfires. (2 & 4) Problem
    came back
    after a couple of days of driving, still missing on the same 2 brand
    new injectors...(@2 & 4 cyl)

    Anyone care to offer an opinion to this idea:
    Is it possible that the 2 injectors that do not cause a misfire (now
    at 1&3 cyl) are the wrong part and causing the problem? (I had
    replaced all 4 injectors over the past couple of years one at a time
    from whatever parts house was closest/cheapest when the old ones
    started leaking)
    Like if I put the 2 injectors I just pulled in 1&3 is there a
    possibility that could
    fix it? With the miss following injectors around it seems obvious its
    not a wiring issue or a computer issue, right? Otherwise miss wouldnt
    follow the injectors (unless I am thinking wrong somewhere) . And with
    a brand new pair of injectors still misfiring (and the miss following
    when I move them to different cylinders) it seems like that could be
    the only possible answer. (Mind you, I spent $350 to have the dealer
    replace a fuel regulator then say 'its possessed by a demon' and
    scratch his head in the meantime here, or would just buy 2 more
    injectors to make sure) I'm about ready to give up on the beast as
    this problem is costing me about 10-15 MPG but would appreciate any
    input from you all....



    › See More: 1997 2.2 chevy cavalier p0300 random misfire fuel injector

  2. #2
    Steve W.
    Guest

    Default Re: 1997 2.2 chevy cavalier p0300 random misfire fuel injector

    jason.e.carney@gmail.com wrote:
    > I have a 1997 cavalier showing p0300 random misfire on cyl 1&4.
    > Changed plugs/wires/coil/ICM with no result. Swapped #3 injector for
    > #4 and miss followed injector. Swapped 1&2 and 3&4 and it followed the
    > injectors again. So now we are missing on 2 & 4.
    > I replaced the injectors indicated by the misfires. (2 & 4) Problem
    > came back
    > after a couple of days of driving, still missing on the same 2 brand
    > new injectors...(@2 & 4 cyl)
    >
    > Anyone care to offer an opinion to this idea:
    > Is it possible that the 2 injectors that do not cause a misfire (now
    > at 1&3 cyl) are the wrong part and causing the problem? (I had
    > replaced all 4 injectors over the past couple of years one at a time
    > from whatever parts house was closest/cheapest when the old ones
    > started leaking)
    > Like if I put the 2 injectors I just pulled in 1&3 is there a
    > possibility that could
    > fix it? With the miss following injectors around it seems obvious its
    > not a wiring issue or a computer issue, right? Otherwise miss wouldnt
    > follow the injectors (unless I am thinking wrong somewhere) . And with
    > a brand new pair of injectors still misfiring (and the miss following
    > when I move them to different cylinders) it seems like that could be
    > the only possible answer. (Mind you, I spent $350 to have the dealer
    > replace a fuel regulator then say 'its possessed by a demon' and
    > scratch his head in the meantime here, or would just buy 2 more
    > injectors to make sure) I'm about ready to give up on the beast as
    > this problem is costing me about 10-15 MPG but would appreciate any
    > input from you all....


    Replace ALL 4 with a flow matched set. What you're probably seeing is
    that the used injectors are flowing more fuel than the new ones. The
    computer reads this as a misfire because the ones with more fuel
    generate more of a power pulse than the newer ones.

    If you replace all 4 with flow matched units it should take care of the
    problem by insuring that they are delivering the same amount of fuel.
    The problem with replacing them singly is that unless you're buying
    factory spec. NEW units they likely don't match in flow rate or pattern.

    --
    Steve W.
    Near Cooperstown, New York

  3. #3
    jason.e.carney@gmail.com
    Guest

    Default Re: 1997 2.2 chevy cavalier p0300 random misfire fuel injector

    On Nov 25, 12:13 pm, "Steve W." <csr684...@yahoo.com> wrote:
    > jason.e.car...@gmail.com wrote:
    > > I have a1997cavaliershowing p0300 random misfire on cyl 1&4.
    > > Changed plugs/wires/coil/ICM with no result. Swapped #3 injector for
    > > #4 and miss followed injector. Swapped 1&2 and 3&4 and it followed the
    > > injectors again. So now we are missing on 2 & 4.
    > > I replaced the injectors indicated by the misfires. (2 & 4) Problem
    > > came back
    > > after a couple of days of driving, still missing on the same 2 brand
    > > new injectors...(@2 & 4 cyl)

    >
    > > Anyone care to offer an opinion to this idea:
    > > Is it possible that the 2 injectors that do not cause a misfire (now
    > > at 1&3 cyl) are the wrong part and causing the problem? (I had
    > > replaced all 4 injectors over the past couple of years one at a time
    > > from whatever parts house was closest/cheapest when the old ones
    > > started leaking)
    > > Like if I put the 2 injectors I just pulled in 1&3 is there a
    > > possibility that could
    > > fix it? With the miss following injectors around it seems obvious its
    > > not a wiring issue or a computer issue, right? Otherwise miss wouldnt
    > > follow the injectors (unless I am thinking wrong somewhere) . And with
    > > a brand new pair of injectors still misfiring (and the miss following
    > > when I move them to different cylinders) it seems like that could be
    > > the only possible answer. (Mind you, I spent $350 to have the dealer
    > > replace a fuel regulator then say 'its possessed by a demon' and
    > > scratch his head in the meantime here, or would just buy 2 more
    > > injectors to make sure) I'm about ready to give up on the beast as
    > > this problem is costing me about 10-15 MPG but would appreciate any
    > > input from you all....

    >
    > Replace ALL 4 with a flow matched set. What you're probably seeing is
    > that the used injectors are flowing more fuel than the new ones. The
    > computer reads this as a misfire because the ones with more fuel
    > generate more of a power pulse than the newer ones.
    >
    > If you replace all 4 with flow matched units it should take care of the
    > problem by insuring that they are delivering the same amount of fuel.
    > The problem with replacing them singly is that unless you're buying
    > factory spec. NEW units they likely don't match in flow rate or pattern.
    >
    > --
    > Steve W.
    > Near Cooperstown, New York




    So you're saying if I buy another pair of new (matching part#')
    injectors from NAPA (where I bought the 2 new ones last week) I should
    be good?
    Thanks for your input!
    Jason

  4. #4
    Shep
    Guest

    Default Re: 1997 2.2 chevy cavalier p0300 random misfire fuel injector

    Also, make sure you are not picking up dirt in the injector screens, and
    they are sealing good in the head.
    <jason.e.carney@gmail.com> wrote in message
    news:f8b9648f-ff7e-4525-93dd-71b773e2adad@k19g2000yqg.googlegroups.com...
    > On Nov 25, 12:13 pm, "Steve W." <csr684...@yahoo.com> wrote:
    >> jason.e.car...@gmail.com wrote:
    >> > I have a1997cavaliershowing p0300 random misfire on cyl 1&4.
    >> > Changed plugs/wires/coil/ICM with no result. Swapped #3 injector for
    >> > #4 and miss followed injector. Swapped 1&2 and 3&4 and it followed the
    >> > injectors again. So now we are missing on 2 & 4.
    >> > I replaced the injectors indicated by the misfires. (2 & 4) Problem
    >> > came back
    >> > after a couple of days of driving, still missing on the same 2 brand
    >> > new injectors...(@2 & 4 cyl)

    >>
    >> > Anyone care to offer an opinion to this idea:
    >> > Is it possible that the 2 injectors that do not cause a misfire (now
    >> > at 1&3 cyl) are the wrong part and causing the problem? (I had
    >> > replaced all 4 injectors over the past couple of years one at a time
    >> > from whatever parts house was closest/cheapest when the old ones
    >> > started leaking)
    >> > Like if I put the 2 injectors I just pulled in 1&3 is there a
    >> > possibility that could
    >> > fix it? With the miss following injectors around it seems obvious its
    >> > not a wiring issue or a computer issue, right? Otherwise miss wouldnt
    >> > follow the injectors (unless I am thinking wrong somewhere) . And with
    >> > a brand new pair of injectors still misfiring (and the miss following
    >> > when I move them to different cylinders) it seems like that could be
    >> > the only possible answer. (Mind you, I spent $350 to have the dealer
    >> > replace a fuel regulator then say 'its possessed by a demon' and
    >> > scratch his head in the meantime here, or would just buy 2 more
    >> > injectors to make sure) I'm about ready to give up on the beast as
    >> > this problem is costing me about 10-15 MPG but would appreciate any
    >> > input from you all....

    >>
    >> Replace ALL 4 with a flow matched set. What you're probably seeing is
    >> that the used injectors are flowing more fuel than the new ones. The
    >> computer reads this as a misfire because the ones with more fuel
    >> generate more of a power pulse than the newer ones.
    >>
    >> If you replace all 4 with flow matched units it should take care of the
    >> problem by insuring that they are delivering the same amount of fuel.
    >> The problem with replacing them singly is that unless you're buying
    >> factory spec. NEW units they likely don't match in flow rate or pattern.
    >>
    >> --
    >> Steve W.
    >> Near Cooperstown, New York

    >
    >
    >
    > So you're saying if I buy another pair of new (matching part#')
    > injectors from NAPA (where I bought the 2 new ones last week) I should
    > be good?
    > Thanks for your input!
    > Jason





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  5. #5
    Steve W.
    Guest

    Default Re: 1997 2.2 chevy cavalier p0300 random misfire fuel injector

    Shep wrote:
    > Also, make sure you are not picking up dirt in the injector screens, and
    > they are sealing good in the head.


    I tried telling a customer that his reasons for a lean condition was due
    to bad O-rings on the injector bases. His response was that HE had just
    installed new injectors and the O-rings were fine. He left the vehicle
    and I pulled the rack, HMM He did install new injectors BUT the O-rings
    were GONE.... Not just bad but missing. Cleaned the rack, flow cleaned
    the injectors and installed new seals. Put it back together and no lean
    condition. Who'd of thunk it...




  6. #6
    Vic Smith
    Guest

    Default Re: 1997 2.2 chevy cavalier p0300 random misfire fuel injector

    On Tue, 25 Nov 2008 16:19:53 -0500, "Steve W." <csr684NOT@yahoo.com>
    wrote:

    >Shep wrote:
    >> Also, make sure you are not picking up dirt in the injector screens, and
    >> they are sealing good in the head.

    >
    >I tried telling a customer that his reasons for a lean condition was due
    >to bad O-rings on the injector bases. His response was that HE had just
    >installed new injectors and the O-rings were fine. He left the vehicle
    >and I pulled the rack, HMM He did install new injectors BUT the O-rings
    >were GONE.... Not just bad but missing. Cleaned the rack, flow cleaned
    >the injectors and installed new seals. Put it back together and no lean
    >condition. Who'd of thunk it...
    >

    Steve, while you're here, maybe you suggest something for my 2.2.
    '90 Corsica, throttle body.
    Shakes like hell at idle, otherwise okay.
    Plugs, wires are good.
    I'm thinking something need cleaning, but haven't got my kid on it
    yet.
    Any suggestions?

    --Vic

  7. #7
    Steve W.
    Guest

    Default Re: 1997 2.2 chevy cavalier p0300 random misfire fuel injector

    Vic Smith wrote:
    > On Tue, 25 Nov 2008 16:19:53 -0500, "Steve W." <csr684NOT@yahoo.com>
    > wrote:
    >
    >> Shep wrote:
    >>> Also, make sure you are not picking up dirt in the injector screens, and
    >>> they are sealing good in the head.

    >> I tried telling a customer that his reasons for a lean condition was due
    >> to bad O-rings on the injector bases. His response was that HE had just
    >> installed new injectors and the O-rings were fine. He left the vehicle
    >> and I pulled the rack, HMM He did install new injectors BUT the O-rings
    >> were GONE.... Not just bad but missing. Cleaned the rack, flow cleaned
    >> the injectors and installed new seals. Put it back together and no lean
    >> condition. Who'd of thunk it...
    >>

    > Steve, while you're here, maybe you suggest something for my 2.2.
    > '90 Corsica, throttle body.
    > Shakes like hell at idle, otherwise okay.
    > Plugs, wires are good.
    > I'm thinking something need cleaning, but haven't got my kid on it
    > yet.
    > Any suggestions?
    >
    > --Vic


    Trade it in and support the economy? ;-)

    Actually it could be a few things. Shaking idle could be an EGR that is
    sticking open a bit from crud. MAP sensor could be getting old. Check
    the motor mounts as well. Age may have made them loose enough to let the
    motor shake.

    How many miles does it have so far?

    --
    Steve W.

  8. #8
    Vic Smith
    Guest

    Default Re: 1997 2.2 chevy cavalier p0300 random misfire fuel injector

    On Tue, 25 Nov 2008 18:54:48 -0500, "Steve W." <csr684NOT@yahoo.com>
    wrote:

    >Vic Smith wrote:
    >> On Tue, 25 Nov 2008 16:19:53 -0500, "Steve W." <csr684NOT@yahoo.com>
    >> wrote:
    >>
    >>> Shep wrote:
    >>>> Also, make sure you are not picking up dirt in the injector screens, and
    >>>> they are sealing good in the head.
    >>> I tried telling a customer that his reasons for a lean condition was due
    >>> to bad O-rings on the injector bases. His response was that HE had just
    >>> installed new injectors and the O-rings were fine. He left the vehicle
    >>> and I pulled the rack, HMM He did install new injectors BUT the O-rings
    >>> were GONE.... Not just bad but missing. Cleaned the rack, flow cleaned
    >>> the injectors and installed new seals. Put it back together and no lean
    >>> condition. Who'd of thunk it...
    >>>

    >> Steve, while you're here, maybe you suggest something for my 2.2.
    >> '90 Corsica, throttle body.
    >> Shakes like hell at idle, otherwise okay.
    >> Plugs, wires are good.
    >> I'm thinking something need cleaning, but haven't got my kid on it
    >> yet.
    >> Any suggestions?
    >>
    >> --Vic

    >
    >Trade it in and support the economy? ;-)
    >

    Now you're making me feel guilty. But I'll get over it.

    >Actually it could be a few things. Shaking idle could be an EGR that is
    >sticking open a bit from crud. MAP sensor could be getting old. Check
    >the motor mounts as well. Age may have made them loose enough to let the
    >motor shake.
    >

    The kid put new mounts on a couple years ago. All four. Said the
    front was a PITA - hacksaw work.
    He's the mechanic now. I just cajole him to get the job done when he
    get's pissed off.

    >How many miles does it have so far?


    114k - 99% city traffic. Car is not fit for road travel because it
    made my ass hurt once I when I used it for a 200 mile trip.
    Got 34 mpg though.
    Ok, he says he'll pull the EGR later this week, and have a look.
    If no help there, he'll check the MAP.

    --Vic


  9. #9
    Steve W.
    Guest

    Default Re: 1997 2.2 chevy cavalier p0300 random misfire fuel injector

    Vic Smith wrote:
    > On Tue, 25 Nov 2008 18:54:48 -0500, "Steve W." <csr684NOT@yahoo.com>
    > wrote:
    >
    >> Vic Smith wrote:
    >>> On Tue, 25 Nov 2008 16:19:53 -0500, "Steve W." <csr684NOT@yahoo.com>
    >>> wrote:
    >>>
    >>>> Shep wrote:
    >>>>> Also, make sure you are not picking up dirt in the injector screens, and
    >>>>> they are sealing good in the head.
    >>>> I tried telling a customer that his reasons for a lean condition was due
    >>>> to bad O-rings on the injector bases. His response was that HE had just
    >>>> installed new injectors and the O-rings were fine. He left the vehicle
    >>>> and I pulled the rack, HMM He did install new injectors BUT the O-rings
    >>>> were GONE.... Not just bad but missing. Cleaned the rack, flow cleaned
    >>>> the injectors and installed new seals. Put it back together and no lean
    >>>> condition. Who'd of thunk it...
    >>>>
    >>> Steve, while you're here, maybe you suggest something for my 2.2.
    >>> '90 Corsica, throttle body.
    >>> Shakes like hell at idle, otherwise okay.
    >>> Plugs, wires are good.
    >>> I'm thinking something need cleaning, but haven't got my kid on it
    >>> yet.
    >>> Any suggestions?
    >>>
    >>> --Vic

    >> Trade it in and support the economy? ;-)
    >>

    > Now you're making me feel guilty. But I'll get over it.
    >
    >> Actually it could be a few things. Shaking idle could be an EGR that is
    >> sticking open a bit from crud. MAP sensor could be getting old. Check
    >> the motor mounts as well. Age may have made them loose enough to let the
    >> motor shake.
    >>

    > The kid put new mounts on a couple years ago. All four. Said the
    > front was a PITA - hacksaw work.


    Some of them can be REALLY fun.

    > He's the mechanic now. I just cajole him to get the job done when he
    > get's pissed off.


    That works for employees as well....

    >
    >> How many miles does it have so far?

    >
    > 114k - 99% city traffic. Car is not fit for road travel because it
    > made my ass hurt once I when I used it for a 200 mile trip.
    > Got 34 mpg though.


    I have the same problem with most of the "economy" cars out there.

    > Ok, he says he'll pull the EGR later this week, and have a look.
    > If no help there, he'll check the MAP.


    Make sure he also checks the passages for the EGR. No sense pulling
    it,cleaning it and having it get stuck again....

    >
    > --Vic
    >



    --
    Steve W.
    Near Cooperstown, New York

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