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Random misfire on Acura – and seems mysterious

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    ms2000ms2000
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      1999 Integra LS with 144k miles and Auto, B18B1 – no mods
      Well maintained. Due to the random misfire at idle (car shakes too), did the following still an issue:
      P0300, P0304 and at times P0303 – now all cylinders
      – sparks (OEM), wires (after market)
      – front O2 sensor (OEM)
      – cap & rotors
      – valves adjusted 22k miles ago
      – air filter has 8k
      – cleaned IACV
      – Compression were from 175 to 190
      – Spark plugs did not show any abnormality
      – Swapped ignition coil but no change
      – Batt and Alternator tested fine
      – cold start gave gas smell through exhaust
      – at times smelt gas under the hood but no sign of leaks
      – engine compartment is mostly dry – needed to put new O-ring on Dizzy – the issue started before this repair
      – Lately idle misfire goes away when warms up but happens at 2500rom – then misfires on all Cyl
      – only known issue is the car would need jump start if you don’t drive for 2 weeks & high NOx

      Fuel Trim:
      Originally:
      1500 rpm 2500 rpm
      LTFT 6.2 6.2
      STFT 6.2 8.6

      After I disconnected the battery and let all the Capacitors discharge at idle:
      LTFT – 4.6 4.6
      STFT – 7.8 – 12.5

      Had the car for more than 10 yrs.
      Any help? How can I get Eric to reply?

      Can 87 vs 91 gas or additives cause misfire?

      • This topic was modified 3 years, 3 months ago by ms2000.
      • This topic was modified 3 years, 3 months ago by ms2000.
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