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Reply To: Random misfire on Acura – and seems mysterious

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#990120
ms2000ms2000
Participant

    My car passed SMOG despite the potential of P0171 at idle:
    Test 2021-Final → 2021 (prior 2 tests)
    15mph 81 → 357-> 578 (from highest 578 to 81)
    25mph 44 → 1079-> 639 (from highest 1079 to 44)

    This is a 1999 with 144k miles. Emission levels are amazing! These are better than what I had 10yrs ago.
    I still have to figure the Fuel Trim maxing out on idle! I was going to change the IAC but saw some improvement (unsure its lasting improvement) so instead went for the SMOG. I will be pursuing a diagnosis.

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