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Old 10-11-2005, 05:01   #1 (permalink)
Dark1
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90 tbird cruise control weak..

had the problem since I got the car, some 35,000 miles ago..
the cruise control works, but when confronted with even a mild uphill grade,
I get to watch the (digital) speedo gradually drop..
if the hill is big enough, it will get to 10mph under the set point and give
up and shut down..
I need to tear the dash apart to replace the heater core anyway, so while
I'm at it, just exactly where should I be looking?


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Old 10-11-2005, 08:01   #2 (permalink)
Backyard Mechanic
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Re: 90 tbird cruise control weak..

"Dark1" <betterask4it@ifyouwantit.com> wrote in
news:PjN2f.31636$tD4.8412@tornado.ohiordc.rr.com:

> had the problem since I got the car, some 35,000 miles ago..
> the cruise control works, but when confronted with even a mild uphill
> grade, I get to watch the (digital) speedo gradually drop..
> if the hill is big enough, it will get to 10mph under the set point
> and give up and shut down..
> I need to tear the dash apart to replace the heater core anyway, so
> while I'm at it, just exactly where should I be looking?
>
>
>


not under the dash.. unless there's a vacuum leak under there. Esp the
dump valve at the brake pedal assy

Get a vac gauge and pump, hook it to servo vac port and see if it will hold
somewhat of a vacuum.


Call a scrapper and get the price of a used servo ... there should be
plenty of them

There's a time to "throw parts" at a problem and I would inspect all the
lines for kinks and leaks, and if I found none, i'd just replace it.

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Old 10-11-2005, 15:01   #3 (permalink)
Dark1
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Re: 90 tbird cruise control weak..


"Backyard Mechanic" <pettyfog@yaywho.com> wrote in message
news:Xns96EC660386441pettyfogery@207.115.63.158...
> "Dark1" <betterask4it@ifyouwantit.com> wrote in
> news:PjN2f.31636$tD4.8412@tornado.ohiordc.rr.com:
>
>> had the problem since I got the car, some 35,000 miles ago..
>> the cruise control works, but when confronted with even a mild uphill
>> grade, I get to watch the (digital) speedo gradually drop..
>> if the hill is big enough, it will get to 10mph under the set point
>> and give up and shut down..
>> I need to tear the dash apart to replace the heater core anyway, so
>> while I'm at it, just exactly where should I be looking?
>>
>>
>>

>
> not under the dash.. unless there's a vacuum leak under there. Esp the
> dump valve at the brake pedal assy
>
> Get a vac gauge and pump, hook it to servo vac port and see if it will
> hold
> somewhat of a vacuum.
>
>
> Call a scrapper and get the price of a used servo ... there should be
> plenty of them
>
> There's a time to "throw parts" at a problem and I would inspect all the
> lines for kinks and leaks, and if I found none, i'd just replace it.
>


well every vac line not going into the firewall has been recently replaced,
and I have a cable from the throttle and a vac line(which looks fine for the
whole 3 inches I can see)disappearing into the backside of the fender well,
so I'm assuming the servo is under the dash?


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Old 10-11-2005, 16:01   #4 (permalink)
Backyard Mechanic
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Posts: n/a
Re: 90 tbird cruise control weak..

"Dark1" <betterask4it@ifyouwantit.com> wrote in
news:OmW2f.31710$tD4.24327@tornado.ohiordc.rr.com:



>
> well every vac line not going into the firewall has been recently
> replaced, and I have a cable from the throttle and a vac line(which
> looks fine for the whole 3 inches I can see)disappearing into the
> backside of the fender well, so I'm assuming the servo is under the
> dash?
>
>
>


No... it's in the fender, behind the wheel. Take off wheel, take off inner
splash. Not hard
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Old 10-11-2005, 16:01   #5 (permalink)
clemdog
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Re: 90 tbird cruise control weak..

servo located in fender well,not in dash.

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Old 10-11-2005, 16:01   #6 (permalink)
Dark1
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Posts: n/a
Re: 90 tbird cruise control weak..


"Backyard Mechanic" <pettyfog@yaywho.com> wrote in message
news:Xns96ECBB5E05383pettyfogery@207.115.63.158...
> "Dark1" <betterask4it@ifyouwantit.com> wrote in
> news:OmW2f.31710$tD4.24327@tornado.ohiordc.rr.com:
>
>
>
>>
>> well every vac line not going into the firewall has been recently
>> replaced, and I have a cable from the throttle and a vac line(which
>> looks fine for the whole 3 inches I can see)disappearing into the
>> backside of the fender well, so I'm assuming the servo is under the
>> dash?
>>
>>

cool.. thanks much..
>>

>
> No... it's in the fender, behind the wheel. Take off wheel, take off
> inner
> splash. Not hard



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