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new user needs help with high idle

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Old Jan 14, 2007 | 04:50 PM
  #1  
cjclarke's Avatar
cjclarke
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From: Palestine Tx
new user needs help with high idle

i have a 88 f150 5.0 auto last week it started a real high idle no tach but around 30 mph if i dont touch the pedal. wont kick down either. searched some other posts not sure of answer thou. i disconnected the wires for the iac and the tps and very slight change but not enough to even help a little have otc code reader but in storage cant get to it right now. changed rad 1 mounth ago oreilly gave me wrong one old was 1 row new one is 3 or 4 row runs cool all the time now new thermostat and water pump too.but runs at n on normal (dummy -gauge) dont know if that temp has to do with it because that r and r was a mounth ago problem started last week without any warning any ideas thanks cj
 
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Old Jan 14, 2007 | 06:09 PM
  #2  
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vega73gt
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I had a similar problem so check this vacumme leak,egr valve, iac, water temp sensor.
Mine idel up to 2000 rpm and the uper intake gasket was bad.
Jim
 
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Old Jan 14, 2007 | 06:15 PM
  #3  
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cjclarke
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From: Palestine Tx
thanks i hope i can fix it sure is hard on the tranny at stop light.
 
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Old Jan 14, 2007 | 06:17 PM
  #4  
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cjclarke
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From: Palestine Tx
can i check high idle vacuum leak with propane?? if so wouldnt that make it idle higher if it found one or would it lower the idle??
 
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Old Jan 14, 2007 | 06:30 PM
  #5  
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Old_Paint
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Yes you can, and yes it will idle faster and smoother. That is the safest way. Using liquid solvents or cleaners is a very bad idea on a hot engine. That's a disaster waiting to happen. The propane won't puddle or flash and make a very dangerous and explosive vapor. It just blows away.

Check particularly around the base of the plenum, between that and the lower intake. This is a common problem on the 5.0's.
 
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