sporadic cruise control

My cruise control has started acting up. Sometimes is works fine but
sometime (and getting more frequent) it turns on (the dashboard
indicator lights up) but won't allow me to set the speed. I push the set
button but the cc never kicks in.

Also, when it does set properly it will sometimes disengage when I hit a
bump in the road (not major bumps just typical Florida US 75 stuff).

It sorta seems that something has come out of adjustment but my Haynes
manual has no cruise control info.

Does anyone have any idea what is going wrong and how I can fix it?


Best Regards,

Marcel

maleemi wrote:
> My cruise control has started acting up. Sometimes is works fine but
> sometime (and getting more frequent) it turns on (the dashboard
> indicator lights up) but won't allow me to set the speed. I push the
> set button but the cc never kicks in.
>
> Also, when it does set properly it will sometimes disengage when I
> hit a bump in the road (not major bumps just typical Florida US 75
> stuff).
> It sorta seems that something has come out of adjustment but my Haynes
> manual has no cruise control info.
>
> Does anyone have any idea what is going wrong and how I can fix it?

Year, model?

Most of the time it's a vacuum leak or a faulty solenoid.

--
DougW

> Year, model?

Er..yeah, my bad. It's a '96 Grand 6 cyl Laredo

maleemi > wrote:

> My cruise control has started acting up. Sometimes is works fine
> but sometime (and getting more frequent) it turns on (the
> dashboard indicator lights up) but won't allow me to set the
> speed. I push the set button but the cc never kicks in.
>
> Also, when it does set properly it will sometimes disengage when I
> hit a bump in the road (not major bumps just typical Florida US 75
> stuff).
>
> It sorta seems that something has come out of adjustment but my
> Haynes manual has no cruise control info.
>
> Does anyone have any idea what is going wrong and how I can fix
> it?

Check the brake switch, going off when you hit a bump might mean the
switch is too touchy.



--
XS11E, Killing all posts from Google Groups
The Usenet Improvement Project: http://blinkynet.net/comp/uip5.html

> Check the brake switch, going off when you hit a bump might mean the
> switch is too touchy.

Thanks for the reply. I apologize for my ignorance but what/where is the
brake switch and how to I check it?

On Mon, 25 Jun 2007 01:24:09 GMT, maleemi > wrote:

>
>> Check the brake switch, going off when you hit a bump might mean the
>> switch is too touchy.
>
>Thanks for the reply. I apologize for my ignorance but what/where is the
>brake switch and how to I check it?

If you look under the dash at the brake lever (part attached to the
brake petal) you will see a little box with a plunger coming out of it
that rests on the top side of the brake petal. There is a nut holding
the switch that can be adjusted to allow more or less pressure on the
switch. In the case of my '93 it is off when depressed fully. As
you apply the brakes, the plunger comes further out lighting the stop
lamps. It's a very touchy adjustment, and may require a new switch.

Dick

--
Posted via a free Usenet account from http://www.teranews.com

Dick proclaimed:

> On Mon, 25 Jun 2007 01:24:09 GMT, maleemi > wrote:
>
>
>>>Check the brake switch, going off when you hit a bump might mean the
>>>switch is too touchy.
>>
>>Thanks for the reply. I apologize for my ignorance but what/where is the
>>brake switch and how to I check it?
>
>
> If you look under the dash at the brake lever (part attached to the
> brake petal) you will see a little box with a plunger coming out of it
> that rests on the top side of the brake petal. There is a nut holding
> the switch that can be adjusted to allow more or less pressure on the
> switch. In the case of my '93 it is off when depressed fully. As
> you apply the brakes, the plunger comes further out lighting the stop
> lamps. It's a very touchy adjustment, and may require a new switch.
>
> Dick
>
For the original poster, please keep enough of the old posting so
someone can follow it.. for example, keep the 96 grand cherokee I-6
presumably with automatic trans in each post.

Does it have any trouble codes?
This is the on-off-on-off-on of ignition in 5 seconds.
Look for flashing Check Engine light.

A 55 is end of codes.
15 is the speed sensor input path, checked while vehicle is moving
34 is the speed control path with an open or short in speed vacuum
sensor, vent solenoid sensor, speed control switch voltage low, speed
control switch voltage high.

Disengaging, particularly on bumps is usually the stop lamp switch or
speed control switch loose or misadjusted.

With the notoriously bad jeep grounds always on the table of choices.


The speed control switch may be best handled by someone familiar with
the concepts of a live airbag going off in your face... the switch
itself is held on by a couple screws from the back of the wheel.
Just pull all leads from the battery and wait about 5 minutes first.

"maleemi" > wrote in message
news:nZDfi.1754$yp.480@trnddc08...
> My cruise control has started acting up. Sometimes is works fine but
> sometime (and getting more frequent) it turns on (the dashboard indicator
> lights up) but won't allow me to set the speed. I push the set button but
> the cc never kicks in.
>
> Also, when it does set properly it will sometimes disengage when I hit a
> bump in the road (not major bumps just typical Florida US 75 stuff).
>
> It sorta seems that something has come out of adjustment but my Haynes
> manual has no cruise control info.
>
> Does anyone have any idea what is going wrong and how I can fix it?
>
>
> Best Regards,
>
> Marcel

My CC was doing the exact same thing yours is. The problem in my case was a
vac line was sitting a bit loose under the hood and was rubbing against a
piece under the hood. It ended up rubbing a hole right through the line to
the cruise control but at the same time, would actually close the hole
enough at times for the cruise to all of a sudden work for a short bit.
Fixed the line and the problem was gone.