Chevrolet :: 1985 - Cruise Engages But Vary The Speed Up And Down
Feb 25, 2014
I have owned this 85 Chevy Van all its life and when I take it on trips I like to use the cruise control. The last few years the cruise engages and works except that it seems to hunt or vary the speed up and down a couple of miles an hour. I replaced the servo figuring that it was just old and leaking vacuum. Well the new one behaved exactly the same. So what else is there? The electronics module? I have looked everywhere under the hood and under the dash with no luck. Manuals don't even include the cruise system. What is the location of the module?
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1990 Cherokee 4.0 ... Well I've got a minor clunking somewhere under there that seems to vary with speed. now I have to figure out what it is. my working theories are wheel bearing, or one of the three hundred odd universals under there. perhaps a brake shoe or the transfer case. This is my first 4wd, so I don't know about transfer cases.... there is also some kind of weird double universal under there, I can t remember the name off the top of my head.
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Cruise on/off works. Light on the dash. Some days pressing the "set" switch engages immediately. Other days, press it 20 times, nothing. Guessing switch contacts could use some cleaning/replacing. Service manual doesn't address how to pull the switch on the steering wheel...
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Where is the cruise control amplifier located on an 85 F-150? The Chilton manual just says "behind the instrument panel". No pic or further description. Just looking up from the bottom of the dash I see a "black box" with 2 wires going into the top of it located just between the steering column and the wiper switch.
Is this it?
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I have a 2003 F250 Super Duty 5.4 crew cab. Cruise light comes on when engaged but does not work. I did some research on why its not working checked wiring at the throttle body it seemed ok, Fuse is ok. Also did the self test and everything passed with just one flash but cruise still does not work. I read about many problems with the brake pressure switch but would it pass the self test if that pressure switch was bad? Also what should a switch cost. Local dealer wanted $125.00 for a new one and I have read where they cost around $15.00 - $20.00.
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When braking at very slow speeds(less than 5 mph), my ABS system engages. It can be startling and the truck keeps rolling forward unless I pump the brakes to get it to stop. The truck is drivable, I just have to be careful when pulling into our garage or slowing behind someone at a traffic stop. What could be causing this?
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Started yesterday. Dry road. Brand new Perrelli P4s . at about 60-65 traction control comes on and car starts doing the "surging". I had the same tires on it up to this point so except for being new,no difference.
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I have changed the master cylinder and bled the brakes but I need to find out how to set the brake light switch that is located on a crossmember under the radiator. The master cylinder went bad and all the fluid leaked from the rear reservior causing the brake warning light on the dash to come on. How do I reset the switch?
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I placed my Corvette with a consignment seller this summer. When he had no action, I took the car back but...battery dead. Fully recharged it, car started immediately (first time in 2-months) but then died and will not restart. My ace mechanic has replaced fuel pump, distributer, but no fire. Indication is weak/no signal at he injectors. Could this be residual Theft Prevention system? I had that fail years ago and I pulled the module and the car has done fine for 4-years, until now.
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On the battery level gauge, it generally varies between two bars on the graph up to one bar from the top. I've read that this variance indicates 60% charge at the two bars and 80% charge at the one bar from the top position. So the battery is only depleted to 60%, then the ICE comes on and charges the battery. My confusion comes from several posts that say it's bad to deplete the battery and I agree that it's bad, but how do you deplete the battery if it is only allowed to vary between 60 and 80%?
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I have a 2016 f250 bought in December with an ac problem. The temperature in ky has heated up the last month and the ac has not been able to keep up. The fan seems to work properly but, the air temps seem to vary while on the same setting(max). The problem also varies from nonexistent to mildly bad to horrible. The ford dealer found low side pressure at 60psi and the high side at 300 psi. At idle. Evac and recharge and test. Within a day or two, same problem. A week later at the dealer. Low side 50. High side 275. Found and replaced sticking expansion valve. Road tested and passed. Again within a day or two same thing. Yesterday it was 100 outside and the vent temp was 65-70 degrees. Today at home I ran the ac 4 or 5 times and is was cooling around 45-48 degrees. The outside temp was not as hot today as yesterday. The truck is the lower trim lariat with the dual zone ac. It does not have the voice command. The service advisor was going to consult with the service manager and discuss what to do and to discuss opening what he called a "hot line" to ford. This truck is rapidly getting too much shop time for a new truck.
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My owners manual says that when cruise is turned on there is a "cruise" symbol in the color MFI - that works as advertised. It also states that after pressing "set" at speed the set speed should also be displayed.
Do a 'set' speed display with cruise and if so do you have NAV or not. Do you have Color or Red MFI ?
What VIN series - I am 37XXX
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My vehicle shows currently two awkward behaviors:
1) I can start the vehicle using the keyless start button without having to step on the brake pedal.
2) I can switch on cruise control. The green symbol appears, however, I cannot set a speed. The system simply seems to ignore that I press the set button.
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So my cruise is giving me issues, won't set the speed. Turns on and off no problem but set and resume do not work. However, turn off the car and then re-start it and the cruise works again. I know the radio is only up to 60k.
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When I have it set to 1, 2, or 3 it does not work, but on 4 (full speed), it works fine.
It was working fine until this evening driving home. On top of that, my check engine light turned on in the middle of driving home, which was after I found out that the 1,2,3 weren't working. We did have a big snow storm today, but I don't know how that could affect it. I was also running the fan on 4 this morning while letting my car warm up/shovel.
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I love my 2003 Honda CR-V and it works perfectly except for the cruise control. It may work for 5 miles or 200 miles, but at some point while riding along just fine the car bucks, decreases and then increases speed, and then the cruise disengages. Once this happens, it takes a long time for the cruise control to take hold again. This is an intermittent problem and almost impossible for a mechanic to figure out. I'd love to solve this mystery as I plan to keep this car for at least 300,000 miles! I'm only up to 179,000.
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My cruise control will engage but not maintain set speed. It slowly loses KPH, 10 KPH every 30 seconds. What to look for?
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The cruise control on my 2000 Blazer LS 4X4 is not working. I just changed the multi-function switch and still nothing. I looked at the throttle cables and they seem to be fine. All the fuses are good as well.
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Have had the vehicle since 24k miles - currently at 43k and just started doing this in the past 5k miles. When cruise control is engaged, and we go over a bump (of decent size) the cruise disengages. Perhaps a bad connection with a sensor? I do not know the cruise system that well on this vehicle and would like to know where I should start looking.
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I've been traveling on the highway a lot lately for work and it seems like whenever I put my 2006 Prius on cruise speed at around 72-76 MPH, engine noise is through the roof. Now I understand that Prius has a small engine compared to my stronger Camry, but I was wondering to know about highway speed and RPM's for 2nd Gen Prius?
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The cruise on my 2013 LS460 SWB RWD sucks big time! Both Dynamic and Normal cruise modes are WAY too sloppy in speed regulation. I was out today on a 55mph PSL two-lane with set speed of 59mph. On a long SLIGHT downhill, the indicated speed topped out at 70MPH!!!
BTW, tranny shifting was weird during this episode with a prolonged run at over 3k RPM. At any rate, that's 11mph over the set speed for the arithmetically challenged. So instead of tooling along at a maximum of 5 over the PSL as my 2007 LS would have done (set speed 59 + overspeed 2 = 61 indicated = 60 actual, so 5mph over PSL), I'm flying at 10mph over the PSL ripe for the picking by any county sheriff (and I saw THREE of them on that road, all with their radar on).
I figure my car's speed regulation (in both Dynamic and Normal cruise) is +11mph/-2mph for set speed of 59mph. That is crazy!
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