'85 high idle

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'85 high idle

Postby jubegnx » Tue Aug 22, 2017 7:28 pm

Hi there,

New member here, got an '85 LSC with throttle body fuel injection and am experiencing a high idle when car is in park or neutral. When in drive or reverse it runs great.

Recent:
New battery, plugs, wires, distributor cap, air filter, fuel filter, and an oil change.

Does anyone know how to adjust the idle speed? or if someone could point me in the right direction.

Thanks
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Re: '85 high idle

Postby oldschool1 » Wed Aug 23, 2017 3:17 am

Welcome.
If it's an LSC and displays RPMs, then 750 is our low idle. A cold idle can be as high as 1100.
Does it have an analog dashboard or digital?
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Re: '85 high idle

Postby 2manymarks » Wed Aug 23, 2017 8:03 am

oldschool1 wrote:Welcome.
If it's an LSC and displays RPMs, then 750 is our low idle. A cold idle can be as high as 1100.
Does it have an analog dashboard or digital?


:roll: IIRC no analog until 86??
As of July2017, 11 Mark[*] VII's, 3 licensed for the road:
1989 LSC Midnight/Current Red c/c (9G) mostly stock 99k.
1989 LSC Midnight/Current Red c/c (9G) 124k, stock, needs air suspension & bodywork.
1989 Light Titanium c/c (11) Bill Blass - stock. miles unk
1989 LSC Medium Sandalwood (62) Mass air+ 111k FOR SALE $900.
1986 BB (8T) stock 125k (wife'sDD)
1987 BB (4L) stock (miles unk)
1987 Base Model White (9L) 107k (2.73rear)
1984 Turbo Diesel Base model, Platinum (1Q), 131k+ FOR SALE $1000.
Parts cars: 88 LSC, 89 BB, 90 LSC - TLZ 5spd (complete conversion w/extras 4SALE)
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Re: '85 high idle

Postby oldschool1 » Wed Aug 23, 2017 11:06 pm

Whoops.
True, true.
1986 was the FIRST year for our Lincoln Mark VII LSCs to have ANALOG gauges.

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Re: '85 high idle

Postby jubegnx » Fri Aug 25, 2017 9:02 am

oldschool1 wrote:Welcome.
If it's an LSC and displays RPMs, then 750 is our low idle. A cold idle can be as high as 1100.
Does it have an analog dashboard or digital?


It has a digital dash, without the tach...
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Re: '85 high idle

Postby oldschool1 » Fri Aug 25, 2017 10:14 pm

In that case, an automotive inductive tachometer is needed.
Program it to your engine size, clamp it on to an ignition wire, start the car, read the RPMs.
EZ Tach Cordless Inductive Tachometer shown below.

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Re: '85 high idle

Postby jubegnx » Mon Aug 28, 2017 2:31 pm

I can tell you without that device that the idle is well above 1000 rpm. And it is steady while idling. Basically it is stuck in the cold start mode as someone mentioned above. Usually it would taper down however not anymore. Is there anything I could adjust?
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Re: '85 high idle

Postby beek0 » Mon Aug 28, 2017 2:54 pm

I don't know if the about the '85, but the '84 has an electric elemet fast idle control. It is a round black part on the passenger side of the TBI. The wire going to it should have 12 volts going to it with the engine running, if no voltage check the alt/regulator cuircit. The engine has to be running to get voltage. The fast idle control looks and and act just like the one a caburetor. Hope this helps.
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Re: '85 high idle

Postby beek0 » Mon Aug 28, 2017 3:56 pm

Checked the 1985 wiring schematics and it shows the choke heater comes from the S term. of the alterator.
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Re: '85 high idle

Postby oldschool1 » Tue Aug 29, 2017 3:59 pm

Good advice!
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Re: '85 high idle

Postby jubegnx » Sun Sep 03, 2017 7:34 pm

Can you point out where that black thing is here;

Image

also what is this thing in red;

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Re: '85 high idle

Postby jubegnx » Sun Sep 03, 2017 11:59 pm

I answered my own question, that is the black round thing.

Here is a great video explaining the fast idle for the early CFI ford systems.

https://www.youtube.com/watch?v=a70NaznEoDU
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Re: '85 high idle

Postby oldschool1 » Mon Sep 04, 2017 6:28 am

Good video and yes, that's the cold start sequence ... explained :)
I love my early Marks.
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Re: '85 high idle

Postby beek0 » Mon Sep 04, 2017 7:11 pm

Hope you got your idle fixed. I am going to try to explain how the high idle element works. There is a bi-metal spring that coils tighter the colder it gets, making the engine idle higher. There is a heating element behind it and when it gets power the coil slowly unwinds and the engine idles normally. Two things will keep this from working the way it should. Number one is the element needs 12 volts . Number two is the element sometime burns out. There should be resistance between the termanal and ground, I do not have a cfi high idle element but checked a Holley choke element and it had 12.5 ohms. If you want to see what they look like inside google "choke element".












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Re: '85 high idle

Postby beek0 » Mon Sep 04, 2017 7:52 pm

Looks like most parts stores call the "black round thing" a Choke Thermostat . A couple replacements are Sandard cv237 and BWD th296.
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Re: '85 high idle

Postby jubegnx » Mon Sep 04, 2017 8:57 pm

Well my friend decided he wants to get rid of the CFI and slap on a carb. I will post pictures and instructions once it is done (if it gets done :P )
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Re: '85 high idle

Postby oldschool1 » Wed Sep 06, 2017 7:46 am

But ... but ... the system actually works well when cleaned and lubed.

We look forward to your progress and thanks for sharing it with us.
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