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Air intake leak

Tiny
GRANT EMERSON
  • MEMBER
  • 2008 VOLKSWAGEN JETTA
  • 2.5L
  • 5 CYL
  • 194,000 MILES
Changed the MAF sensor and EVAP purge valve. Still getting two codes P0171 and P2279. Checked all the air intake connections and no leaks I can see hear or find. Any ideas?
Sunday, October 29th, 2017 AT 4:27 PM

5 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
Have you checked to see if the intake manifold bolts are loose? It is extremely common for them to loosen up on that engine happens all the time.
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Sunday, October 29th, 2017 AT 4:51 PM
Tiny
GRANT EMERSON
  • MEMBER
  • 2 POSTS
The intake is all plastic hoses with squeeze clamps holding the connections together.
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Sunday, October 29th, 2017 AT 7:05 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The intake manifold is held on with Allen headed bolts they loosen up and cause a vacuum happens all the time. You will need a long ball Allen socket to tight all of them up.
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Sunday, October 29th, 2017 AT 9:50 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
I take it the intake manifold is attached to the head of the engine with these bolts?
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Sunday, October 29th, 2017 AT 9:54 PM
Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
So we're the Allen bolts holding the intake manifold on loose?
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Monday, October 30th, 2017 AT 9:11 PM

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