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Ronbo July 18th, 2005, 09:00 PM I need some help with a cruise control issue. I have a 90 LSC. When I set the cruise it would slow down then run like heck to get back up to speed. It would jerk me down the highway to the point I didn't want to run it anymore. THEN, it quit altogether. How do you diagnose and or fix the problem? I am an old school carburetor guy ,and quite honestly, not a Phord man. I don't know the first thing about the computer controlled stuff in this car. HELP!!!!! :Bang
OldSchool1 July 18th, 2005, 10:28 PM Welcome.
Start by correcting any and all vacuum problems that you might have.
Ronbo July 19th, 2005, 05:24 PM Welcome.
Start by correcting any and all vacuum problems that you might have.
Vacuum good to everything. No leaks anywhere. The car was meticulously taken care of when I bought it. 82000 orginal miles. Is there a way to check the BOO switch, or does it have anything to do with the cruise?
:Beer
OldSchool1 July 19th, 2005, 10:18 PM Vacuum good to everything. No leaks anywhere. The car was meticulously taken care of when I bought it. 82000 orginal miles. Is there a way to check the BOO switch, or does it have anything to do with the cruise?
:Beer
hehehe
First, I had to look up just what the hell a BOO switch was :)
On our Marks, the electronic BOO switch above the brake pedal does not work with our cruise controls but the vacuum breaking switch in the same location does. No. I can't think of the correct name for it either :) It's mechanical and works (I think) like a simple wedge. Step on the pedal and you break vacuum to the cruise control module in the fender. Hmm. Now ~there~ is something that I don't have a picture of.
Funny thing is that I actually HEARD the line pop off the module on my 1989. It had about 85,000 miles on it at the time.
Ronbo July 21st, 2005, 10:39 PM hehehe
First, I had to look up just what the hell a BOO switch was :)
On our Marks, the electronic BOO switch above the brake pedal does not work with our cruise controls but the vacuum breaking switch in the same location does. No. I can't think of the correct name for it either :) It's mechanical and works (I think) like a simple wedge. Step on the pedal and you break vacuum to the cruise control module in the fender. Hmm. Now ~there~ is something that I don't have a picture of.
Funny thing is that I actually HEARD the line pop off the module on my 1989. It had about 85,000 miles on it at the time.
In the fender? Which one and where? Thanks for the help!! :Beer
OldSchool1 July 24th, 2005, 07:02 PM In the fender? Which one and where? Thanks for the help!! :Beer
http://www.lscclub.org/temp/passengerFender2.jpg
1989 Mark 7 July 26th, 2005, 10:40 PM Well I have a question now. Why does it take so long for the cruise control to kick in?
OldSchool1 July 26th, 2005, 11:20 PM Well I have a question now. Why does it take so long for the cruise control to kick in?
1) It works on vacuum
2) There's about five things that have to happen to start the process
3) Safety
Ronbo August 4th, 2005, 06:26 PM http://www.lscclub.org/temp/passengerFender2.jpg
Do I have to remove the fender as shown in your pic to get to it, or is it visible and accesible from the engine compartment?
OldSchool1 August 4th, 2005, 11:52 PM Do I have to remove the fender as shown in your pic to get to it, or is it visible and accesible from the engine compartment?
Trace the large soft vacuum lines into the driver's side fenderwell. You may be able to get to it by only removing the wheel well.
Ronbo August 5th, 2005, 07:37 PM :slam :q
1989 Mark 7 August 9th, 2005, 07:29 PM When I decelerate, it'll slow down, then run hard to get back up to speed. Am I having the same problems?
OldSchool1 August 9th, 2005, 09:12 PM When I decelerate, it'll slow down, then run hard to get back up to speed. Am I having the same problems?
I dunno.
Are you referring to your cruise control?
What conditions are present when this happens?
Uphill, down hill, no hill ?
1989 Mark 7 August 10th, 2005, 10:33 PM Cruise control. It was a slight downhill when I decel(ed) and then it ran like heck to get back up to speed.
OldSchool1 August 11th, 2005, 02:18 AM Cruise control. It was a slight downhill when I decel(ed) and then it ran like heck to get back up to speed.
That actually sounds like normal operation to me as our engines are just accellerating to maintain a set speed.
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