My 1985 Town Car Sig.

[gadget73]

Most o the time its just dirty linkages, but make sure the wires that plug into the hockey puck are plugged in.

[Piece-it pete]

MM i'm just keeping it running till I can afford a 460 swap

Thanks for the heads up Tom, one of these decades when I actually get around to it I'll make sure they do!

Thain, I cleaned the heck out of it and examined it. There is a little bit of surface rust on the toothed gear thingie and the bar it holds. I didn't have anything to clean it with, I'm going to pick up a wire toothbrush today. I can pop it off easily by hand but it catches again when I hit the throttle. The wire is plugged in, I will clean the contact. If I can't get it going I'll disconnect it and become a human choke.

Attempted to change the rear rubber brake line again. It's not actually leaking and whoa it's on there, so springtime.

Trans is starting to act a bit wonky. The fluid is dirty but not burnt, I'm going to drain the converter and pan hopefully this weekend. I've already changed the filter.

The cheapest I've found Mercon V is at O'Reillys, you can preorder Motorcraft for $4.99 qt. Anyone know of cheaper?

Pete

[gadget73]

A little rust won't be a big deal. Just make sure the parts move. Usually it gums up with grease and dead fuel and other crap that makes the linkages sticky. Most of the time a flush with carb cleaner gets rid of it and the parts will move easily.

You don't by chance have a 3g on there do you? The stock choke heater works off the stator output on the stock alternator. Upgrading the alternator generally does away with this, unless you either tap it in, or feed it power from somewhere else. Its also possible the choke heater went TU. I dont know if it gets hot enough to be able to detect over the heat from the running engine, but if you've got an ohm meter, it wouldn't be a terrible idea to see if its got some resistance. If the thing died, I'd expect an open circuit. I'd also check to make sure it has some voltage with the engine running. I think its in the neighborhood of 8 volts.

[Piece-it pete]

It's clean as a whistle outside the surface rust. No 3g yet. It's on the list but somehow I'm always behind.

Whooosh! is the sound of advice going over my head I'm not very knowledgeable about this. What's the choke heater? Looking at Rock I see a 'dash pot', a 'choke thermostat', and a 'carburetor choke pull off'. Thinking about it I do have the pull off, it's just a diaphram. A mechanic told me it was going bad but I don't know how to change it.

I check the voltage of the wire going into the 'puck'?

Pete

[marquisman]

i think the choke thermostat is the same thing, as the choke heater. its usally hooked up to 12V, exhaust manifold, or some times both. when the heater is cold, it holds the choke flap closed at the proper spot. as the engine is fired up and warms up, the heat coil heats up(heat sensitive metal), it will move and slowly open the choke plate fully. just so you know, the dash pot(sometimes vac or electric) is used to bump up the idle, for when the A/C kicks in. also, the choke pull-off is vac opperated, will pull the choke high idle cam off and bring the idle to normal.

[Piece-it pete]

Ah so.... thanks!

And, d'oh!:

http://www.grandmarq.net/vb/showthread.php?14587-the-unofficial-CFI-choke-thread

Pete

[marquisman]

[Piece-it pete]

I can't 'see' YT

Two quick questions for my brothers in Ford goodness: where exactly is the much mentioned MAP sensor, and which other Fords had the same CFI engine as my 85?

Pete

[gadget73]

MAP on a CFI car should live over on the passenger side inner fender, in the general area of the smog solenoid mess.

5.0 CFI motor can be found in basically any 84-85 car that had a V8 option. Tbirds, Cougers, LTD, 85 Mustangs with an automatic, Mark VII, any Panther chassis. The sensors are basically all the same from 84-91 though, so if you're seeking a MAP, just yank one from anything that has a MAP that looks the same. Doesn't particularly matter which engine either. 83 and older have odd stuff which isn't useful for you.

[MattsLincoln]

you need cfi map sensors pete i have 3 of them that i will give to you all for $15+ shipping. i collected them from jy since i knew brand new they were around $300.

[Piece-it pete]

Thanks guys. I'm pretty broke so I'm putzing, I still don't have a choke and can't find parts for mine, but have found new choke parts for other cars like a 1984 Mustang...

I'll end up reporting back eventually Matt, thanks, I'm going to see if perhaps I have an issue with it. If so you'll be the 1st person I talk to!

Pete

[gadget73]

The CFI unit is the same on any 84-85 car. Its probably even the same as 3.8 cars, though I'd bet the injectors are different. Ought to be the same choke crap. 84 Mustang is a carb though. You'd need specifically 85 automatic Mustang. 5 speed still had a 4bbl in 85. They probably don't call it a choke, since its not really a choke. Don't quite know what they would list it as though. High idle pulloff maybe?

[Piece-it pete]

Interestingly, they do call it a choke pull off. I've got the puck, a 'carburetor choke thermostat' en route ($2.75 +frt, rock rocks!), and according to my research it's the same one some Motorcraft 2150s use. I'm going to see if the pull off assembly is the same. If so I'll post it, in case the 2 other people in the world that use CFI ever need to know.

If I can't find one I'll grab a JY assembly and attempt to change the guts with the choke pull off diaphram I picked up from Rock a while back.

Pete

[mercurygm88]

When my MAP sensor crapped out on my merc (SEFI) I pulled one from a 20th anniversary gt350 (1984 CFI) and its the exact same as the original map on my 88. Most auto parts stores have them for about $50. The barometric pressure sensor for CFI is the expensive one about $350. Im glad SEFI doesnt have one.

[Piece-it pete]

Well didn't even get to the MAP. Got the choke tstat in, cheap Gates, it only has 1/2 the turns in the coil the Motorcraft one has. Haven't got a chance to really mess with the setting yet but don't think that was the problem.

There is NO WAY the choke pull off assembly matches anything out there. The holder/bracket/pull off casing is part of the CFI mounting plate casting. On the plus side I think I see how to change the diaphram. I will of course blather on about it when I do it

Pete