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2007 Mustang

Tiny
DAWES
  • MEMBER
  • 2007 FORD MUSTANG
  • 2WD
  • MANUAL
  • 24,427 MILES
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.
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Thursday, December 30th, 2010 AT 1:44 AM

2 Replies

Tiny
MERLIN2021
  • 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.
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Thursday, December 30th, 2010 AT 1:48 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 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.
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Thursday, December 30th, 2010 AT 2:08 AM

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