The cruise control on my Buick and Aspen never worked, so I never got a chance to see how the cruise control on a car of the era worked. However the cruise control on the Blassmobile works and that's a 1980, and its scary as shit. If you set it at 60, it will slam the gas down until it gets to 65, then let off completely until it goes back to 59, then it slams it back to 65. I dont know if this is because of a vacuum leak or whatever they had setting the cruise control back then, or if its just primitive and working correctly. What you old guys think?
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the cruise control in these beasts is really really primitive.sigpic
- 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims
- 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust
- 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stock -
Primitive or not, it's not supposed to do that.Comment
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yea, the cruise control in my 86 Vic was nice. I'm sure 86 had better technology though.Originally posted by 1990LTD View PostComment
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Yeah, something isn't right. It should act just as smoothly as a modern cruise control system.
2001 Ford Crown Victoria P71 - "The Fire Engine"
1985 Lincoln Town Car Signature Series
But God demonstrates his own love for us in this: While we were still sinners, Christ died for us. Romans 5:8Comment
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Sometimes I forget mine is set at highway speed and hit it on a city street and thats kinda scary."Shakedown"- 1991 Grand Marquis GS Dual exhaust, Magnaflow xl turbos, Rear anti sway bar, Outlaw 1 wheels, 43k miles
1985 GMC 1500
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Is the cruise control linkage all connected properly?
On an 84 Regal I had, which admittedly had computer-controlled cruise, I had similar symptoms, albeit to a much lesser extent... the cruise was constantly sloppy and overcompensating.
It turns out that the linkage that went from the cruise unit to the throttle on the carb had an adjustment, with a threaded adjustment at the cruise unit itself, and a slotted bracket at the end that attached to the carb.
The threaded end was supposed to be adjusted so that the slotted end was just touching the throttle lever on the carb, but not pulling on it.
Well, some previous mechanic had screwed with it and left a lot of slack . . so the cruise would start to pull, there'd be no response, and so it'd pull more and more insistently until suddenly it grabbed too quickly and you'd feel the car surge.
Then it'd let off suddenly. Lather, rinse, repeat.
It *could* be something as simple as that. Just going by the one and only experience I had with a faulty cruise mechanism.1987 Ford LTD Crown Victoria 2-door Coupe - perpetually "sort of" for sale...
Black with Red cloth (velour?) interior.
Purchased on 10/10/2008, with only 70,386 original miles, and only ONE previous owner.
Reader's Ride post, First pic with "new" rims, Other pics with "new" rimsComment
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Well.....just for comparison....I had a 78 (barge-body) Marquis that had cruise control and it worked well. I mean, if you were going up a steep incline it would give a fair amount of throttle to maintain speed (especially if it down shifted), but it was nothing like the problem your having. It pretty-much just maintained the speed I set it at.Originally posted by insomniac391 View PostFormer panther owner
1981 CV 351 4bbl
1991 CV 302 EFIComment
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The 86 has the same system. Almost guarantee you have a vacuum leak. My 91 Mark VII does the same thing, though not as severe, and the cruise servo leaks. Pull vacuum on it and see what happens. If its not the booster, it may be the vacuum dump valve above the brake pedal. The one on the VII leaks, but unfortunately they're obsoleted from Ford so I don't know what to do about it. There are several check valves between the manifold vacuum source and the cruise servo (or at least there is on slightly later models) and if one of those is bad, it will cause problems.Last edited by gadget73; 02-17-2010, 12:25 AM.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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This makes me think of the cruise I had on a 76 Plymouth GranFury once. It would come on and work just fine, but it would slowly creep up faster and faster. It was so slow that you wouldn't notice right away. You'd eventually overtake some other traffic, and realize that something was wrong. Looking down you'd notice that you were going 15-20 mph faster than you were when you set it. It's a thousand wonders that nobody got a ticket over it.Owner of the only known 5 speed box wagon with a lift kit.
AKA, Herkimer the Hillbilly SUV.
Axle codes
Open/Lock/Ratio #
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G / H / 2.26
B / C / 2.47
8 / M / 2.73
7 / - / 3.07
Y / Z / 3.08
4 / D / 3.42
F / R / 3.45
5 / E / 3.27
6 / W / 3.73
2 / K / 3.55
A / - / 3.63
J / - / 3.85Comment
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My Mark cruise works great, but I have to hit Set at 63 to get it set at 65...
My 85 CP is seamlessLast edited by 85MercPark; 02-17-2010, 10:13 AM.2000 Grand Marquis LS
2000 F150 XLT 6 inches of lift.
1987 Bill Blass Mark VII - Sold
1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
Mercury Owners Group member
Save The Whales, Restore an Old Station Wagon!!Comment
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The cruise on my 85 did something similar after i did the SEFI conversion and put a ball/cable from a 89 or so on it. It would hover about 2 mph above and below what i set it at, giving me minor whiplash every time it pulled and let off, lol. It reminded me of a road trip i took with a certain female (she drove like that)
I suspect the ball was leaking or defective, because putting the old ball back with the newer cable did the trick. i tried adjusting the cables tension on the throttle many many settings to no avail.Pete ::::>>> resident LED addict and CFI defector LED bulb replacements
'LTD HPP' 85 Vic (my rusty baby) '06 Honda Reflex 250cc 'Baileys' 91 Vic (faded cream puff) ClifFord 'ODB' 88 P72 (SOLD) '77 LTDII (RIP)
sigpic
85HPP's most noteworthy mods: CFI to SEFI conversion w/HO upperstuff headers & flowmasters P71 airbox Towncar seats LED dash light-show center console w/5 gauge package LED 3rd brake light 3G alternator mini starter washer/coolant bottle upgrade Towncar power trunk pull underhood fuse/relay box 16" HPP wheels - police swaybars w/poly rubbers - budget Alpine driven 10 speaker stereoComment
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It holds speed steady and smooth, just have to set it 2 mph lower than what I want
2000 Grand Marquis LS
2000 F150 XLT 6 inches of lift.
1987 Bill Blass Mark VII - Sold
1985 Mercury Grand Marquis Colony Park- SOLD. to a little old lady
Mercury Owners Group member
Save The Whales, Restore an Old Station Wagon!!Comment
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mounted to the driver's side fender. I think its 3 nuts from the top side, and a small metal plate falls into the wheel well. Pretty simple to access and replace. Check to make sure its not just a cracked vacuum line first.Originally posted by insomniac391 View Post86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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