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Old 07-18-2005, 23:01   #1 (permalink)
finiteguy
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98 Grand Marquis surges (misses) at high speeds

My 98 Grand Marquis is surging at highway speeds. Seems as though this
is a common problem with this car. My brpother has 99 CV and he had to
replace spark plug coils. Could there be anything else causing this?
By the way, my brother's 99 CV needs a new ignition switch because his
shorted out. I'm wondering if mine will do the same? Seems like thesed
are all common problems.

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Old 07-18-2005, 23:01   #2 (permalink)
chuckster
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Re: 98 Grand Marquis surges (misses) at high speeds

I have a 2000 Crown Vic and after many miles of missing and two trips
to the dealer (under warranty) I decided I had enough of this B.S and
decided to replace ALL 8 coils and plugs. It was the best thing I have
done to this car, and it runs like it was new. All I can say is to go
for it. You can toy around with it and try to sort the bad coils out
but I did not have the time and patience to do this. I purcahsed 8
coils at $48 each from auto zone and took one hour to do the whole job.
I have 77k. on it and I have noticed that I get this missing problem in
the hot summer months so I think it could be the boots breaking down
also. Let us know how you make out. Good luck!

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Old 07-19-2005, 07:01   #3 (permalink)
Tom Adkins
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Re: 98 Grand Marquis surges (misses) at high speeds

chuckster wrote:
> I have a 2000 Crown Vic and after many miles of missing and two trips
> to the dealer (under warranty) I decided I had enough of this B.S and
> decided to replace ALL 8 coils and plugs. It was the best thing I have
> done to this car, and it runs like it was new. All I can say is to go
> for it. You can toy around with it and try to sort the bad coils out
> but I did not have the time and patience to do this. I purcahsed 8
> coils at $48 each from auto zone and took one hour to do the whole job.
> I have 77k. on it and I have noticed that I get this missing problem in
> the hot summer months so I think it could be the boots breaking down
> also. Let us know how you make out. Good luck!
>


It's normally the boots that fail, the coils are usually ok. When a coil fails it is
usually a dead miss. I don't have the source or part number handy, but replacement
boots are available. One should treat the boots as a maintenence item like spark plug
wires. This is also an application where dielectric grease on the boots is an absolute
must. Without it the boots WILL carbon track down the sides of the boots to the base
of the plug in very short order.
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Old 07-22-2005, 20:01   #4 (permalink)
finiteguy
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Re: 98 Grand Marquis surges (misses) at high speeds

Is replacing the boots difficult? Seems like you have to remove the
fuel rail.

On Tue, 19 Jul 2005 06:41:39 -0400, Tom Adkins
<newton5@remove.comcast.net> wrote:

>chuckster wrote:
>> I have a 2000 Crown Vic and after many miles of missing and two trips
>> to the dealer (under warranty) I decided I had enough of this B.S and
>> decided to replace ALL 8 coils and plugs. It was the best thing I have
>> done to this car, and it runs like it was new. All I can say is to go
>> for it. You can toy around with it and try to sort the bad coils out
>> but I did not have the time and patience to do this. I purcahsed 8
>> coils at $48 each from auto zone and took one hour to do the whole job.
>> I have 77k. on it and I have noticed that I get this missing problem in
>> the hot summer months so I think it could be the boots breaking down
>> also. Let us know how you make out. Good luck!
>>

>
>It's normally the boots that fail, the coils are usually ok. When a coil fails it is
>usually a dead miss. I don't have the source or part number handy, but replacement
>boots are available. One should treat the boots as a maintenence item like spark plug
>wires. This is also an application where dielectric grease on the boots is an absolute
>must. Without it the boots WILL carbon track down the sides of the boots to the base
>of the plug in very short order.


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