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
157,475

James answered 4 years ago

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

Mark helpful
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.
Mark helpful
157,475

James answered 4 years ago

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

Mark helpful

Your Answer:

Related Questions

  • Vacuum leak 2005 Mustang 4.0 3 Answers

    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 an...

    2005 Ford Mustang Coupe RWD

    -

    Maintenance & Repair

  • Vacuum leak v6 2008 mustang 3 Answers

    How to repair vacuum leak 2008 v6 mustang

    2008 Ford Mustang V6 Coupe RWD

    -

    Maintenance & Repair

  • 2005 Mustang 4 Answers

    Will a 2001 Ford 4.0 SOHC drop in my 2005 Ford Mustang with manual trans?

    2005 Ford Mustang Coupe RWD

    -

    Maintenance & Repair

  • 2010 ford mustang 4.0 liter transmission 2 Answers

    I have a 2010 ford mustang 4.0 sealed transmission and it doesn't leak fluid wasnt slipping was driving fine I shut it off went in house came back out started it up put in gear and it wouldn'...

    2010 Ford Mustang V6 Coupe RWD

    -

    Maintenance & Repair

  • 1990 Ford Mustang 5.0 vacuum lines 3 Answers

    I need help, I have a vacuum leak from the intake/throttle body area and the car barely idles and dies.

    1990 Ford Mustang GT Hatchback RWD

    -

    Maintenance & Repair

Mustang

Looking for a Used Mustang in your area?

CarGurus has 1,268 nationwide Mustang listings starting at $4,995.

Postal Code:

Shortcuts

Search Ford Mustang Questions

CarGurus Experts

  • #1
    Gene Arnett
    Reputation
    3,160
  • #2
    Bob Beaman
    Reputation
    2,690
  • #3
    rst429
    Reputation
    2,640
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Corvette
36 Great Deals out of 992 listings starting at $19,500
Used Dodge Charger
36 Great Deals out of 614 listings starting at $4,888
Used Ford F-150
299 Great Deals out of 15,725 listings starting at $1,712
Used BMW 3 Series
69 Great Deals out of 1,205 listings starting at $1,995
Used Ford Mustang SVT Cobra
5 listings starting at $19,900
Used Chevrolet Silverado 1500
171 Great Deals out of 5,940 listings starting at $3,995
Used BMW M3
7 Great Deals out of 99 listings starting at $15,995
Used Honda Civic
154 Great Deals out of 3,390 listings starting at $2,230
Used Lexus IS
20 Great Deals out of 342 listings starting at $5,800
Used Jeep Wrangler
131 Great Deals out of 5,143 listings starting at $6,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.