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5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

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Old 08-02-2006, 01:14 AM   #1
1985stang
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Default Engine Idle Speed?

What is the proper idle speed for an '85 with a 4 barrel. When i got it, it was running about 600 rpm, and i bumped it up to 800-900 rpm. It now seems smoother off the start, but i was just wondering what other people are running.
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Old 08-02-2006, 01:32 AM   #2
88stangaruu
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Default RE: Engine Idle Speed?

I got EFI, but with my cam its set at a lopey 900rpm
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Old 08-02-2006, 01:35 AM   #3
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Default RE: Engine Idle Speed?


Quote:
ORIGINAL: 88stangaruu

I got EFI, but with my cam its set at a lopey 900rpm
Mine's about 950 I guess. I have to have it that high, or it will surge 'cuz I have a 107 lobe sep, with a lower vacum. Stock computer program...
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Old 08-02-2006, 01:36 AM   #4
1985stang
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Default RE: Engine Idle Speed?

yeah, so you think it's good that i bumped it up to 900 rpm. it's still pretty lopey, but nothing like what it was at 600 rpm. lol
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Old 08-02-2006, 01:40 AM   #5
88stangaruu
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Default RE: Engine Idle Speed?

cold starts are a bitch for me, even with EFI. It'll usually cut off three times before it'll run really good on a cold morning.
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1988 Notch. 306, 150NO2, AFR 185's, F-cam. 11.68@124mph.
1985 LX hatch. 69' 302 block, stock internals, MPT70, Megasquirt II, 42# injectors, C4 w/reverse manual/brake. Its a project in process......looking for mid-10's though.

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Old 08-02-2006, 02:14 PM   #6
Nadelle
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Default RE: Engine Idle Speed?

ok ok ok stock it should be right around 750, increasing the idle speed will make the cam percivably smoother and run your engine excesories a little easyer.

so question is...is it stock? if so why run it at somthing other than what ford recomends?
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Old 08-02-2006, 02:23 PM   #7
1985stang
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Default RE: Engine Idle Speed?


Quote:
ORIGINAL: Nadelle

ok ok ok stock it should be right around 750, increasing the idle speed will make the cam percivably smoother and run your engine excesories a little easyer.

so question is...is it stock? if so why run it at somthing other than what ford recomends?
it is bone stock in the engine department to my knowledge, and i have no idea what ford recommends. is it bad to increase the idle speed to help it run smoother?
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Old 08-02-2006, 02:23 PM
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2006, 50, 95, auto, cam, cammed, cold, engine, gt, idle, lopey, megasquirt, mustang, rpm, speed, stock

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