Sputtering Deville

Cal <Nospam DeleteThis @home.net> wrote:
C>I've got a 1999 Deville with 135,000 miles. In the last couple of weeks it
C>just started to misfire occasionally. It has new sparkplugs about 20,000
C>miles ago. Still has original plug wires which I'm suspecting... or maybe a
C>fuel injector??? Gas mileage doesn't seem to be affected.
C>
C>Any other ideas that I may be missing?

You are on the right track; after 100Kmi the plug wires should be routinely
replaced. An easy check would be to have the engine running, and in total
darkness, spray a mist of water over the wires. You might see some miniature
lightning under the hood.

BTW, misfires generally set a DTC, and I believe you can pull them to view. Try
pressing and holding the [Off] and [Passenger Warmer] buttons on the Climate
Control panel simultaneously until all tell-tale lights in front of you
illuminate; then watch the DIC as the DTCs are displayed, current or history.
It will start with PCM. Exit by pushing in the big A/C Temp dial button, or by
turning the ignition off.
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"Bela" <bela RemoveThis @bluedog.cc.emory.edu> wrote in message
news:f1mv5v$6iu$1@aioe.org...
> Cal <Nospam RemoveThis @home.net> wrote:
> C>I've got a 1999 Deville with 135,000 miles. In the last couple of weeks
> it
> C>just started to misfire occasionally. It has new sparkplugs about 20,000
> C>miles ago. Still has original plug wires which I'm suspecting... or
> maybe a
> C>fuel injector??? Gas mileage doesn't seem to be affected.
> C>
> C>Any other ideas that I may be missing?
>
> You are on the right track; after 100Kmi the plug wires should be
> routinely
> replaced. An easy check would be to have the engine running, and in total
> darkness, spray a mist of water over the wires. You might see some
> miniature
> lightning under the hood.
>
> BTW, misfires generally set a DTC, and I believe you can pull them to
> view. Try
> pressing and holding the [Off] and [Passenger Warmer] buttons on the
> Climate
> Control panel simultaneously until all tell-tale lights in front of you
> illuminate; then watch the DIC as the DTCs are displayed, current or
> history.
> It will start with PCM. Exit by pushing in the big A/C Temp dial button,
> or by
> turning the ignition off.

Thanks for the info... actually the only code I got was PZM Bo533 which I
think is referring to a short in the Fuel Sensor... is the sensor easy to
get at and easily replaced?
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Cal wrote:
> I've got a 1999 Deville with 135,000 miles. In the last couple of weeks it
> just started to misfire occasionally. It has new sparkplugs about 20,000
> miles ago. Still has original plug wires which I'm suspecting... or maybe a
> fuel injector??? Gas mileage doesn't seem to be affected.
>
> Any other ideas that I may be missing?
>
>

I've got a 144k mile and at about the 135k mark the same thing happened
to me. I bought the expensive platenium plugs and wires an the problem
is gone!

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