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Old 06-10-2010, 06:33 AM   #1
batmmannn
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Default Cruise Control

I did a search and didn't turn up anything relevent on Cruise Control problems.

I have everything on my car working now except the cruise control and the drivers door lock switch.
The cruise control switch on the dash lights up when pressed but when I try to set it on the steering wheel it just does nothing.

Are there any common failures known about these units? I am posting this a bit premature I suppose cause I have not even checked the fuse if there is one but since the switch lights up I am thinking the fuse is probably OK.

Thanks, Scott
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Old 06-10-2010, 07:43 AM   #2
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The cruise control itself is vacuum operated. There should be a vacuum line(after the throttle plate) that connects the speed control actuator and I believe the heater control valve vacuum lines together. Make sure that vacuum line is there and in good shape. The other common failure point is the rubber boot for the speed control actuator cable will deteriorate, causing it to not move properly/not have enough tension in the cable.
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Old 06-10-2010, 08:57 AM   #3
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Default Rubber Boot

If it is where I think it is yes my rubber boot is loose. It is supposed to be inserted or simply hug there cause when I looked at it it seemed to be broken away from the unit but was not certain that this is the case. Is this the rubber boot for the speed control actuator? Please review this pic I took. My vacume lines look OK. If this is the problem where or how do I repair it and where can I find the parts I need....? Thanks
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Old 06-10-2010, 06:45 PM   #4
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Yep, that's the piece. With that broken, you probably won't be able to keep the tension on that cable. I've heard of people taping them for a quick fix, cuz IF you can find one they're usually not very cheap.

Note: I had one with a broken boot once and my cruise still worked, it was just a little rough when accelerating. So that piece may not be your only problem.
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Old 06-10-2010, 07:13 PM   #5
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Default Cruise COntrol

I was doing some reading and I read that it could be the switch on the clutch or brake that disengages the CC. Also I read that if you drive while resting your foot on the clutch that could keep it deactivated as well. Read that switching rear tires could confuse it. Seems like a lot of ifs there.
I will try it again. Others say it just starts working again or is intermittent. My cables seem OK, will check the fuse today and try it again. Seems like JB weld might be good to reattach that boot. Thanks

UPDATE

Well go figure! I just took it to the local General Store and it works! I made sure I kept my foot off the the clutch and got it above 25mph, tried it and it worked perfectly. I have no idea for sure why! I guess this thing just is coming back to life, I have some creeking in my front end I am looking to see if this has grease certs to lubricate the front end. Thanks for your help.
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Old 06-11-2010, 02:35 AM   #6
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The cruise control isn't operable at speeds below 30MPH, IIRC.

with the broken stop to the sheath/housing the cruise should still operate fine... just a bit roughly as BT mentioned. If the sheath were slit lengthwise it'd be another story.

The cruise system is far from simple in modern cars. For future reference, things to start with are: CC throttle cable, speedo cable, speed sensor signal, vacuum leaks or improper routing, bad clutch switch, brake switch and brake fluid level.
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Old 06-11-2010, 03:36 AM   #7
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Default Thanks Guys

AHHHHH! I had just filled my brake reservoir yesterday or so. Maybe that is why it did not work before.
HEY
My Car just found another gear!!!

I took my right front brakes apart and sprayed the caliper down with PB Blaster. My right caliper was sticking and dragging the right front wheel. The car gained a boost of power after I did this. So far they are releasing OK. Gotta Love Blaster!

Thanks for the tips guys, as I learn more I will answer more posts... My car is really doing OK, I just put a new radiator cap on with a pressure valve.

I think my old cap was releasing too soon allowing radiator fluid to overflow the tank. We will see.... I am losing coolant fluid somewhere..... I hope it stops now.

The car is getting significantly faster, is it possible the rings are seating better and my compression is going up?

Thanks, Scott
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Old 08-04-2010, 05:50 PM   #8
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Default Cc switch, light not coming on

I hope posting correct section, first time user. Hi all, I have an 87 supra, 127k, auto, cc light not working, nor any other part of cruise. Any suggestions? Thanks!
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Old 08-07-2010, 05:15 AM   #9
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Default Cc

Start with your fuses then do a google search there is lots of info on the internet. Mine stopped working again but no time to fool with it right now.
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Old 08-07-2010, 11:47 AM   #10
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OK sorta unrelated but still cruise related, my JDM import (digital dash) model has had a convertor fitted (to comply with UK SVA regulations for imports, which requires an MPH speedo) to change the Km/h readout to mph & because of that my cruise doesn't work till about 40mph as the car "thinks" it's still only doing 40Km/h (25mph)...

Just something to consider if you drive a JDM car with a speedo convertor...
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