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  #1  
Old 11-10-2008, 11:48 PM
 
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Default shakes while im on stop lights or stop signs

Hi please help me, well i have a 97 ford expedition eb that shakes alot whenever i stop, while im in gear.
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  #2  
Old 11-11-2008, 12:05 AM
 
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Default RE: shakes while im on stop lights or stop signs

hi its me again. took it to auto one to get a dianostic scan but they said theres isnt any wrong with my car cause it pass in the dianostic tool thing. so i need help... plz. post me if there is any idea that can help me in this problem.
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  #3  
Old 11-11-2008, 12:14 AM
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Default RE: shakes while im on stop lights or stop signs

If you hold the throttle just 'slightly' open at idle, does it run smooth?
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  #4  
Old 11-11-2008, 12:22 AM
 
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Default RE: shakes while im on stop lights or stop signs

just tried it and i think it did but it just does it when i completely stop, than vibrates the whole front end
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  #5  
Old 11-11-2008, 12:54 AM
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Default RE: shakes while im on stop lights or stop signs

It idles rough in Park/Neutral as well correct?

If you canraise the RPM slightly off idle (1000-1200) and the engine smooths, it could be the IAC (idle air control).. If you raisethe PPM's and the engine still runs rough or misfires it could be other issues. Has the 'check engine light' come on?
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  #6  
Old 11-11-2008, 08:27 PM
 
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Default RE: shakes while im on stop lights or stop signs

yea, i tired to raise up the idle to 900-1k and it runs smooth. So must be the the throttle that I might need to raise it up to 8-900 rpm, cause its staying at 700 rpm rite now. Imma do that and repost to see if it makes a difference.
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  #7  
Old 11-11-2008, 09:05 PM
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Default RE: shakes while im on stop lights or stop signs

If raising the idle slightly makes it runs smooth, you have no CEL (check engine light) chances are the IAC is the fault.. The PCM/IAC are in control of the idle speed.. The throttle plate is factory set and non adjustable...

[IMG]local://upfiles/6756/B6852E76759449509DF931194A582E5B.gif[/IMG]
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  #8  
Old 11-12-2008, 08:17 PM
 
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Default RE: shakes while im on stop lights or stop signs

can you tell my noob self what is pcm/iac stands for... lol. sorry dont know
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  #9  
Old 11-12-2008, 09:01 PM
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Default RE: shakes while im on stop lights or stop signs

PCM is the Powertrain Control Module (known as the computer) , and the IAC is the Idle Air Control motor (some call it a solenoid).. The PCM is in control of the IAC (idle control) to allow 'bypass' intake air to flow around the throttle plate.. PCM is in control idle speed, and allows for load conditions, (A/C demand, Power steering ect.) RPM changesunder idle conditions (to just above) for a more stable idlevarying the IAC's position.. It's not the only thing that can cause a stall or rough idle, but they have a fair failure rate or become plugged, or stick...
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  #10  
Old 11-12-2008, 10:18 PM
 
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Default RE: shakes while im on stop lights or stop signs

so how much is that part will cost me ? looks little on the picture you linked up
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Old 11-12-2008, 10:18 PM
 
 
 
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air, car, control, expedition, explorer, ford, idle, im, light, shakes, shaking, slightly, stop, stopped, vibrates

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