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reving up on its own

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  #1  
Old 12-14-2008, 02:54 AM
Year1998C200's Avatar
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Join Date: Jul 2007
Posts: 20
Default reving up on its own

hey guys,

my car has been reving up on its own while driving...when i come to a stop i notice that the idling is as high as 4000 rpm. but when i press the gas a bit i notice that it stops and goes back to about 700rpm. this happens most of the time when driving. what could be causing this..av also noticed that the car is having a lot of after fire cause of running rich.


someone please help.
 
  #2  
Old 12-14-2008, 06:08 AM
sleepwalker's Avatar
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Join Date: Apr 2004
Location: Philippine Islands
Posts: 7,050
Default RE: reving up on its own

could be some loose connector on idle speed valve.
 
  #3  
Old 12-14-2008, 12:44 PM
Year1998C200's Avatar
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Join Date: Jul 2007
Posts: 20
Default RE: reving up on its own

where is it located?

someone also suggested a faulty ignition coil. could it also cause it? i noticed that when itsreving up on its own and i floor the gas the car does not move. it hesitates.
 
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