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1999 Ford Contour Studder/Stall upon Deceleration and at Id

Tiny
CONTOURISSUE
  • MEMBER
  • 1999 FORD CONTOUR
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
Car has the 2.5L V6. All o2 sensors were recently replaced (within a few months, for unrelated issue). Car began studdering/shaking/sometimes stalling when slowing down or stopped and the rpms got got lower yesterday. Previously replaced the iac valve to fix the same issue a few years ago with success. Replaced it yesterday and the problem improved but still had a slight shake, problem reappeared worse today and is hard to keep car running when slowing down or stopped. ECU gave codes P0171 and P0174 when scanned yesterday.
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Tuesday, January 5th, 2010 AT 11:19 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,755 POSTS
PO- 171 Fuel Trim System Lean (Bank 1)

PO- 174 Fuel Trim too Lean (Bank 2)

What I think you're looking for is a vacuum leak. Have you checked? Also, check around the intake.

Let me know what you find.

Joe
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Thursday, January 7th, 2010 AT 9:02 PM

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