2007 mustang

2007 FORD MUSTANG
24,427 MILES • 2WD • MANUAL
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DAWES
  • MEMBER
  • 1 POST
I have a 2007 Mustang and first i was getting P171 and P174 codes so i replaces MAF sensor and then my plug coil. My check engine light stayed on and I get a rough start but after it warms up it smothes out. Then I took it to Ford and they said that it was my EGR valve so i replaced that but had the same problem so tonight i replaced my O2 sensors and its still doing the same thing so what do i need to get replaced next? I think i am tired of everyone giving me different answers to the same problem. If they dont know then just say so.
Dec 29, 2010 at 5:44 PM
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MERLIN2021
  • ✓Experienced Mechanic
  • 17,250 POSTS
This sounds like you need a new PCV tube(rubber) it may look good, but when touched it starts to crumble. Common problem.
Dec 29, 2010 at 5:48 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Lean fuel condition could be caused by one of the following below:

1.Vacuum leaks
2.EGR and PCV valve.
3.Low fuel pressure.
4.Dirty fuel injectors.
5.Mass Air Flow Sensor.
6.Oxygen Sensor.
Dec 29, 2010 at 6:08 PM
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