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Old 03-23-2005, 08:01   #1 (permalink)
protrack
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91 town car shift problem

My 91 Town car will not shift from park after engine is started. I have to
manualy over ride the system as explained in the owners manual by turning
off the engine, then set the parking brake, then turn the ignition key to
the first notch, then pull gear shift lever to neutral, then start the
engine after which I can then pull the gear shift lever into drive.

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Old 03-23-2005, 08:01   #2 (permalink)
lugnut
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Re: 91 town car shift problem

On Wed, 23 Mar 2005 09:00:14 -0500, "protrack"
<ptk@nospam.bellsouth.net> wrote:

>My 91 Town car will not shift from park after engine is started. I have to
>manualy over ride the system as explained in the owners manual by turning
>off the engine, then set the parking brake, then turn the ignition key to
>the first notch, then pull gear shift lever to neutral, then start the
>engine after which I can then pull the gear shift lever into drive.



Your brake light switch is bad. Should set you back about
$20USD in the aftermarket like Advance, Autozone, Pep, etc.
Ford dealer should be about the same. I have no idea what
labor may be. Takes only a couple of minutes to change.
BTW, you probably have no brake lights which presents a very
high risk of being rear ended until you get this fixed. Do
it today!!.
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Old 03-23-2005, 09:01   #3 (permalink)
Mortimer Schnerd, RN
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Re: 91 town car shift problem

lugnut wrote:
>> My 91 Town car will not shift from park after engine is started. I have to
>> manualy over ride the system as explained in the owners manual by turning
>> off the engine, then set the parking brake, then turn the ignition key to
>> the first notch, then pull gear shift lever to neutral, then start the
>> engine after which I can then pull the gear shift lever into drive.

>
> Your brake light switch is bad.
> BTW, you probably have no brake lights which presents a very
> high risk of being rear ended until you get this fixed. Do it today!!.



He is correct. Either the brake light switch or the connector to the brake
light switch. They're mounted where the brake pedal is hinged inside the cabin.

Not only are you missing brake lights, your cruise control is probably out as
well. He's absolutely right... fix this today. You shouldn't be riding around
without brake lights... not to mention the PITA you're having getting the car in
gear.



--
Mortimer Schnerd, RN

mortschnerd@carolina.rr.com.REMOVE


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Old 03-23-2005, 13:01   #4 (permalink)
Jim Warman
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Re: 91 town car shift problem

Don't forget to check the fuse first...



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Old 03-23-2005, 16:01   #5 (permalink)
marvin@mars.com
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Re: 91 town car shift problem

On Wed, 23 Mar 2005 19:47:13 GMT, "Jim Warman"
<mechanic@tenalpsulet.net> wrote:

>Don't forget to check the fuse first...
>
>

lmfao
its the boo switch
i guarentee it

hurc ast
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Old 03-23-2005, 17:01   #6 (permalink)
trainfan1
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Re: 91 town car shift problem

Mortimer Schnerd, RN wrote:

>
> Not only are you missing brake lights, your cruise control is probably out as
> well.


Cruise control will not be affected by a non-working BOO switch if the
only problem is that the shift interlock & brake lights are not working.

Rob
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Old 03-23-2005, 17:01   #7 (permalink)
Bob
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Re: 91 town car shift problem


"trainfan1" <lmsearing@usdatanet.net> wrote in message
news:TumdnVeV7-Zand_fRVn-qg@usadatanet.net...
> Mortimer Schnerd, RN wrote:
>
>>
>> Not only are you missing brake lights, your cruise control is probably
>> out as well.

>
> Cruise control will not be affected by a non-working BOO switch if the
> only problem is that the shift interlock & brake lights are not working.
>
> Rob


Sure it well, the cruise won't disengage when the brakes are tapped.
Bob


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Old 03-23-2005, 19:01   #8 (permalink)
trainfan1
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Re: 91 town car shift problem

Bob wrote:

> "trainfan1" <lmsearing@usdatanet.net> wrote in message


>>Cruise control will not be affected by a non-working BOO switch if the
>>only problem is that the shift interlock & brake lights are not working.
>>
>>Rob

>
>
> Sure it well, the cruise won't disengage when the brakes are tapped.
> Bob
>
>


Yes it will... through the dump valve (if so equipped... is it?),
otherwise you're right, tap off won't work. It will engage, though.

Rob
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Old 10-07-2005, 12:01   #9 (permalink)
protrack
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Re: 91 town car shift problem

I found out that the boo switch will show conductivity when tested but
stops conducting when real current is applied. This threw me off when I
was testing the circuit.

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Old 10-08-2005, 06:01   #10 (permalink)
Backyard Mechanic
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how to use a meter: Re: 91 town car shift problem

"protrack" <ptk@nospam.bellsouth.net> wrote in
news:de13a041b2e7897a6160a67e1aa4a423@localhost.talkaboutautos.com:

> I found out that the boo switch will show conductivity when tested but
> stops conducting when real current is applied. This threw me off when I
> was testing the circuit.
>
>


Another point for the argument against "ohming out" automotive circuits...
although it probably would have shown relatively high resistance; maybe 5-
30 ohms.

using test light or volts scale would have nailed it.
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