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 02-23-2008, 11:50 PM
  #1  
sardoghh65
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Default Idle Problem

Okay I have posted before and here we go again. I still have a issue with the idle sticking and sometimes surging when at a light in neutral (manual). I have replaced the IAC, MAF meter and sensor, cleaned the throttle body, verified TPS set to .98, and can't find any vacuum leaks. My SMOG gear is gone so the EGR is out.

I have been told it can be a coolant sensor, MAP sensor and whatever else I forgot by now. [:@]Anybody know where the next best place to start is???
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Old 02-24-2008, 01:40 AM
  #2  
Blck92GT
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Default RE: Idle Problem

stock cam?
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Old 02-24-2008, 08:24 AM
  #3  
sardoghh65
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Default RE: Idle Problem

Yes its still stock.
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Old 02-24-2008, 08:54 AM
  #4  
Joel5.0
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Default RE: Idle Problem

DIY KOEO/KOER/Cylinder Balance Self-Test
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Old 02-24-2008, 10:17 AM
  #5  
CantStopTheFox...
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Default RE: Idle Problem

I am in the same boat.....I tried EVERYTHING!!

Now I blame my cam....but if yours is stock, that is not your problem

How about your O2 sensors?
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Old 02-24-2008, 04:41 PM
  #6  
sardoghh65
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Default RE: Idle Problem

Not sure on the O2 sensor. What do I need to check there??? I will attempt the test above tommorrow.
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Old 02-25-2008, 01:07 AM
  #7  
Hung Like a Stang
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Default RE: Idle Problem

you can test cross counts of the 02 sensor to see if they're lazy, reading rich, or lean. back probe with a meter and make sure its crossing 450mv. if they're staying high you'r rich, low you're lean. barely crossing 450mv, they're lazy (need new ones)
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Old 02-26-2008, 09:42 AM
  #8  
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Default RE: Idle Problem

Have the same problem. Some one said its the o2 sensors, they are rich off idle and when the engine comes down to idle, the computer thinks its rich so it goes lean and wants to stall the engine. Make sense?
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