Engine P1151 & P1131 appeared and I need help

Eric_WTM

New Member
Apr 28, 2019
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I have a 2003 Ford Mustang GT and as I was letting it warm up for work. I noticed that I had a check engine light for P1151 & P1131 and its saying that the car is running lean. The car is running poorly and I checked the fuel pressure "30psi" and the vacuum lines and there all good.
 
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wmburns

SN Certified Technician
Aug 14, 2009
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Just wondering. HOW did you measure the fuel pressure? With an external gauge at idle with the intake vacuum reference line connected? If so, 30-32 PSI is good fuel pressure.

What have you done to rule out:
  • Intake vacuum leak
  • exhaust manifold leak.
 
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Eric_WTM

New Member
Apr 28, 2019
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oceanside
sorry for responding so late. I actually found the problem child and it was just a vacuum leak. thank you for trying to help me.