Vacuum leak 2005 Mustang 4.0
10

Asked by Flordrums Jan 21, 2020 at 03:14 PM about the 2005 Ford Mustang Coupe RWD

Question type: Maintenance & Repair

Have a vacuum leak on brand new ESM, underside of EGR diaphragm.
Electrical connector and vacuum lines good, purge valve good, brand new
ESM bracket, FRPS, fuel pump, and fuel filter. Codes P0171 and P0174.
Cleared codes and reset KAM multiple times, codes keep coming back.

3 Answers
155,185

james answered 4 years ago

A bad mass airflow sensor can cause this problem. Hope that helps! Jim

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10

Flordrums answered 4 years ago

Thank you, Jim, that was the problem! We hadn’t messed with the MAF because the customer had just installed it before bringing the car in to our shop. Turns out it was some cheap no-name brand. Installed a new Hitachi one, and cleared it up!

1 people found this helpful.
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155,185

james answered 4 years ago

Awesome!! Thanks for letting us know!! I'm very happy it's fixed!! Glad to help!! Jim

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