987 · Fuel

P2187

System Too Lean at Idle (Bank 1)

MED SEVERITY

Bank 1 fuel mixture is too lean at idle.

SYMPTOMS

  • Check-engine light
  • Rough idle
  • Possible stall

LIKELY CAUSES

  • Vacuum/intake leak
  • Dirty MAF
  • Low fuel pressure
  • Dirty injectors

DIAGNOSIS STEPS

  • Read idle fuel trims
  • Smoke-test the intake
  • Check MAF and fuel pressure

RELATED PARTS

  • MAF sensor
  • Intake gaskets
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