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.

idle problem

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Old 12-13-2005, 02:05 AM
  #1  
RumbleBee89gt
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Default idle problem

hey im having an idle problem. it jumps from .5 rpms up to 2 rpms. always fluctuating never stays at a certain rpm. i have a brand new idle sensor, and brand new TB gasket. any ideas??thanks.
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Old 12-13-2005, 02:09 AM
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Crazyfast50stang
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Default RE: idle problem

maybe some sort of out of wack vacuum leak that will clog then unclog?
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Old 12-13-2005, 02:12 AM
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rmodel65
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Default RE: idle problem

do u have a k=n conical filter?
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Old 12-13-2005, 02:13 AM
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RumbleBee89gt
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Default RE: idle problem

not sure, the car came with a mac intake. not sure about the filter. could be a k&n.could it be the air flow meter?
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Old 12-13-2005, 02:19 AM
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Erik90LX5.0
 
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Default RE: idle problem

I had a similar problem mostly would idle very low and rough. Found vacuum line from under upper plenum goes froward to vapor cannister it was soft and rotted out .Hope it helps
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Old 12-13-2005, 02:24 AM
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RumbleBee89gt
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Default RE: idle problem

thanks for the help, im gunna check the vaccum lines tomarow,does anyone have a link to where i can find a vaccume line diagram?
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Old 12-13-2005, 10:00 AM
  #7  
vfast
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Default RE: idle problem

clean the maf
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Old 12-13-2005, 02:10 PM
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RumbleBee89gt
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Default RE: idle problem

your supposed to clean the maf with carb cleaner right??or just wipe it out?
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Old 12-13-2005, 02:41 PM
  #9  
Djs94stang
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Default RE: idle problem

No, alcohol and a cotton swab.
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Old 12-13-2005, 03:29 PM
  #10  
RumbleBee89gt
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Default RE: idle problem

ok,i cleaned the maf.didnt help.cant find any vac leaks. does anyone have a chart of the whole vaccume chart?
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