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2000 Mazda B4000 Surging idle

Tiny
EJACK850
  • MEMBER
  • 2000 MAZDA B4000
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 72,000 MILES
Engine starts right up, but idle surges and may stall until warm--runs great after engine warms up. Engine codes suggest Mass Air, O2 Sensors, EGR. Local shop thinks it could be warped plastic intake?
Thursday, December 4th, 2014 AT 4:45 PM

2 Replies

Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
This issue is so common in the 4.0L from ford. Go this link and see if points you in the right direction. I will add to this the issue with intake also being the fuel rail intake manifold paper gasket (TSB) On this problem.

https://www.2carpros.com/questions/ford-other-p0171p0174-ford-40l-common-causes-testing-and-fixes
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Thursday, December 4th, 2014 AT 5:46 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
What engine codes do you have
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Thursday, December 4th, 2014 AT 6:37 PM

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