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idles too high when warm and too slow when cold..

idles too high when warm and too slow when cold..

  #1  
Old 01-17-2005, 11:38 PM
1st Gear
Thread Starter
Join Date: Apr 2004
Location: Canada
Posts: 8
Default idles too high when warm and too slow when cold..

my 84 5000 S starts well, but wants to idle when cold around 400/500 RPM which i think is too slow when cold. when engine is at operating temp, in Park it will idle at around 1100/1200 RPM. this seems backwards. do i have a vacum leak. or defective cold start valve??
 
  #2  
Old 01-18-2005, 01:47 PM
2nd Gear
Join Date: Mar 2004
Location: Swamplands of NJ
Posts: 761
Default RE: idles too high when warm and too slow when cold..

Since you are in Canada I am not sure which engine management you have but here are some ideas. Check the cold start circuit. On my 84 4000S I had a similar problem that turned out to be corroded contacts on the coolant temperature sender (not the gauge sender). The auxiliary air valve or idle stabilizer valve (ISV) could also be a problem, check to make sure that it works. The ISV relies on a micro switch on the throttle to tell the ECU when it is supposed to be idling. This switch either breaks or gets corroded bypassing the ISV circuit. Another culprit on older cars was the warm up regulator that provides cold enrichment. On cars with ISV valve there is no warm up regulator but a differential pressure regulator mounted on the fuel distributor. This too can wear or the wiring could break.
 
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