throttle plate gap

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throttle plate gap

Postby 5151 mm » Tue Nov 07, 2017 4:02 pm

In idle the throttle plate gap is zero. It's fully closed. Is that right? If not, what's the proper throttle plate gap?
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Re: throttle plate gap

Postby CDW6212R » Tue Nov 07, 2017 7:07 pm

Do not adjust the idle stop screw, ever. It's factory set and the only time to adjust it, is if someone touches it, adjust it, messes with it. And it is not simple to put back where it belongs, it's a process you have to look up.

The IAC solenoid adjusts the idle, which is an adjustment of the air that gets in, to achieve the desired idle.
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Re: throttle plate gap

Postby 5151 mm » Wed Nov 08, 2017 1:43 pm

I want to check, whether the factory settings are still there, or whether somebody messed around with it. The screw is already very loose, by the way...
So where do I find information about the throttle plate gap?
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Re: throttle plate gap

Postby CDW6212R » Wed Nov 08, 2017 4:16 pm

There should be a spring behind the idle stop screw, so it dodesn't want to move. The throttle normally is close to being shut, but not touching. I'm not sure where to look for the instructions on how to adjust that screw. I've read references to the procedure on the Corral forum, and the SBFtech forum. But it's so rare that finding the right search terms is the biggest hurdle.
Don
1991 Red Special Edition, my 2nd SE, dead paint, DWS 255/45/17's on 95 Cobra wheels, and soon; DVD/Navi/backup camera, OBDII and the 347, before custom paint.
98 Mountaineer with Continental DWS 255/55/18's, big sway bars, custom brakes. Soon to be A4WD with XP8 bumpers and wing.

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Re: throttle plate gap

Postby robertbweltzien » Sun Nov 12, 2017 12:56 pm

I have adjusted it on my ā€˜89 LSC. The factory setting had it idling too low, especially when running all accessories at idle. The IAC functions perfectly, so as with any idle issues, the IAC should be checked first for proper functioning before messing with the throttle setting. Iā€™m not totally sure why the idle needed to be increased but I suspect timing chain slack is a factor after 196,000 miles.

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Re: throttle plate gap

Postby robertbweltzien » Sun Nov 12, 2017 12:58 pm

BTW what year is your Mark? I have the ā€˜89 factory manual with me that gives the procedure.

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Re: throttle plate gap

Postby 5151 mm » Sat Nov 25, 2017 6:35 am

It's a friend's 1989 LSC.
Where in manual is the procedure?? I'm sure my friend has the shop manual, too, but couldn't find the desired information.
Can you tell me the page or take a photo of it?
Thanks!
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