2005-2014 Mustangs Discussions on the latest S197 model Mustangs from Ford.

startup idle

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Old Sep 15, 2007 | 09:58 AM
  #1  
bcstang's Avatar
bcstang
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Default startup idle

hey guys, ok, just remembered a q i have. when i start my car it idles really high for a minute or 2, around 1k rpms and slowly goes down, is this an emissions thing built into the car, and can i stop it with my xcal somehow?
Old Sep 15, 2007 | 10:01 AM
  #2  
howarmat's Avatar
howarmat
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From: IN
Default RE: startup idle

1k is prettty normal...not high at all...it will drop down to 750 or whatever when it is ready
Old Sep 15, 2007 | 10:03 AM
  #3  
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marcuskeeler
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Default RE: startup idle

Mine never has idled as low as 750 either stock or with the two seperate tunes I've had. 900 is the lowest, and that rarely happens.......
Old Sep 15, 2007 | 10:04 AM
  #4  
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bcstang
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Default RE: startup idle

thx. i just moved 2000 miles so have no friends to consult instead of posting lol
Old Sep 15, 2007 | 10:13 AM
  #5  
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smythge
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Joined: Oct 2006
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From: WI
Default RE: startup idle

When the engine is first started, a very rich air/fuel mixture is required because cold fuel vaporizes slowly, As soon as the engine starts, it needs air to keep running and to offset the super rich fuel mixture hence the higher idle.
Old Sep 15, 2007 | 10:22 AM
  #6  
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wingman75
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From: Sterling Heights, MI
Default RE: startup idle

Thats normal. At least mine does it. Maybe not that high though.

Marcus, yours sounds too high to me. Should settle on 750 or so.
Old Sep 15, 2007 | 10:53 AM
  #7  
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grampa_stang
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From: Utah
Default RE: startup idle

It's normal, but most people (me included) say upon initial startup in the morning,
it idles at around 1500....then slowly drops to normal. It's kinda like an automatic
choke I guess. Don't trip on it.
Old Sep 15, 2007 | 11:23 AM
  #8  
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oshkoshbajawsh
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Default RE: startup idle

mine idles just over 1 every time i startup
Old Sep 15, 2007 | 11:48 AM
  #9  
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Thurman
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Default RE: startup idle

Normal. mine does it every cold start up.
Old Sep 15, 2007 | 12:19 PM
  #10  
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moosestang
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From: Gainesville, FL
Default RE: startup idle

???????? Stock idle is 750. Even with the whipple tune mine idles at 750. My brenspeed tune was 850, but I changed it back to 750.

ORIGINAL: marcuskeeler

Mine never has idled as low as 750 either stock or with the two seperate tunes I've had. 900 is the lowest, and that rarely happens.......



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