Cruise Control Operation

[ihuntsum]

85.5 944 - I do not know how to operate my cruise control and do not know if it works. I do not have an owner's manual so if anyone could tell how it is supposed to operate, I would appreciate it.

Thanks

[sweetskillsrk]

I have had this problem too. When trying to engage the cruise control you have to stay at a relatively same speed, some cars you hit the cruise control and it immediately goes at the speed you're currently going in, but I think in the 944 it takes a second. Have you tried to operate it at all? If it doesn't work its either the servo or the cruise control computer. I still need to work on mine and I'm not sure where the problem is yet but read up on Clarks Garage under the Garage Shop Manual. Before you do anything to it definitely test it.
I hope this helps,

[ihuntsum]

I do not know how to begin to operate the cruise. I have pulled the lever to me, pushed it away, tried it up and tried it down. I do not see any lights - can't tell a thing.

[Pops944]

A short version of operation from the owners manual is:
1. To actuate the cruise control over 25mph push the control lever forward and release; after a second or two the cruise control will take effect.
2. When passing just use the accelerator as normal and when you remove your foot from the accelerator the cruise control will resume at the set speed.
3. When shifting gears, the cruise control is temporarily out of the circuit while the clutch is depressed, but re-engages after the clutch pedal is released.
4. Whenever the brake pedal is depressed it disengages the cruise control. Pushing the cruise control lever down will resume the set cruise control speed.
5. To disengage the cruise control (turn it off) pull the lever toward yourself.

note: if going up hill and engine speed is too low the cruise control will automatically disengage. If this happens downshift to a lower gear to avoid engine stalling.

Hope this helps.

[TibetanT]

ihuntsum:

Take a look inside the engine compartment and make sure you have a servo motor for the cruise control. If you don't then, that would explain why nothing is working.

Cruise control servo motor is mounted just in front of the battery on a late 944n/a.

[TibetanT]

Servo looks like this:

[mikepellegrini]

Here's a link to a copy of a manual for an 87 model that's online: http://alordofchaos.com/Documents/944_owners_manual.mht

What you want is on page 29.

[ihuntsum]

Thank all of you very much. Servo is definitely in place. I will check operation next time I drive.

[MichaelMcClurg]

hi, when i got my car, the cruise wasn't working either, my problem was really simple, the cable that goes to the server, has a snap on type plastic tip that snaps onto a small ball on the server my cable had come off, I snapped it back on and the cruise worked. I need a spring or clip to hold the black plastic piece in place on the ball, as without it, it comes off, I have taped it in place, but it still gets loose. I would check this cable out, I have had a similar problem on other cars with cruise. I hope this makes sense. Good luck, Michael

[bearone2]

Originally Posted by Pops944

A short version of operation from the owners manual is:
1. To actuate the cruise control over 25mph push the control lever forward and release; after a second or two the cruise control will take effect.
2. When passing just use the accelerator as normal and when you remove your foot from the accelerator the cruise control will resume at the set speed.
3. When shifting gears, the cruise control is temporarily out of the circuit while the clutch is depressed, but re-engages after the clutch pedal is released.
4. Whenever the brake pedal is depressed it disengages the cruise control. Pushing the cruise control lever down will resume the set cruise control speed.
5. To disengage the cruise control (turn it off) pull the lever toward yourself.

note: if going up hill and engine speed is too low the cruise control will automatically disengage. If this happens downshift to a lower gear to avoid engine stalling.

Hope this helps.

you need to rethink #3.

when the clutch is pushed in while shifting, there's no load on the engine and rpm's will go way up until the clutch is released.

try it.

[Pops944]

As my post started, this was a brief recap from the owners manual. Since I don't use my cruise control, I've never had reason to test this aspect. Sorry for trying to provide help.

[bearone2]

cruise is nice on a long straight-away and a very rude awakening at cruising speeds if you downshift.

fwiw:
i don't reply unless i have 1st hand knowledge of how something works or will be affected.

[kdjones2000]

Originally Posted by bearone2

you need to rethink #3.

when the clutch is pushed in while shifting, there's no load on the engine and rpm's will go way up until the clutch is released.

try it.

This is not true, unless your system is not working properly. There is a switch on the clutch pedal that will deactivate the CC when it is depressed.

Why my brain started dying, this feature stopped working. Replaced the brain, it all works as stated.

Keith

[bearone2]

Originally Posted by kdjones2000

This is not true, unless your system is not working properly. There is a switch on the clutch pedal that will deactivate the CC when it is depressed.

Why my brain started dying, this feature stopped working. Replaced the brain, it all works as stated.

Keith

oh really.
just where is that switch?

mine engages, holds speed, can accerate/decel/disengage with the stalk or disconnects if the brake pedal is touched.

until i had this ride with a 5sp, i've never personally seen cc on a manual tranny.

[Pops944]

Buy the manual and the service manuals, and learn.

[bearone2]

Originally Posted by Pops944

Buy the manual and the service manuals, and learn.

got 'em, keep up the good work

[pinball_0]

My cruise was intermittent and when working, the car was wanting to cruise at 80 mph,

First-
I followed clarks garage's instructions, disassembled the cruise controller, found only one questionable joint on a capacitor, resoldered it and inspected every other joint... soldered the back side of the connector pins that connect into the harness to the leads that feed the pcb... as I have seen similar problems with dissimilar metal connections on other types of equipment, reassembled it and tested - no change in symptoms.

So I did the Second part-
I opened my servo under the hood, had fun with the factory seal pin that they pressed like a rivet.. so i could seperate the halves and clean up the carbon traces and tighten the wiper arms. reassembled -SUCCESS!!!

now it works perfectly... accelerates holding lever forward, resumes pushing stalk down,and setting speed by holding arm forward while constant speed, releasing at the tap of the brake or clutch.

JUST to LET you ALL know!!!

[wild man]

The CC does indeed hold speed through gear changes on these vehicles (if working properly). All other makes that I have owned/driven did not. But if I recall correctly, they also used a cheaper vacuum servo, rather than an electric one.