My car has one strange issue which affecting starting and misfire.

With 91 octane starting is good but misfire randomly at idle with air con on.

With 95 or 98 octane starting is very difficult I have to do 3 times try to start up . However, no misfire.

  • when driving the car is ok Only misfire at idle at traffic lights. With this issue I have driven 30000km. But car hasn't stopped yet. Car I bought 175000km then now 200000km almost. I didn't know when the issue occurred coz previous owner.

I have replaced fuel filter , pump , temperature sensor with ecu sender, timing tensioner , cam sensor , crank sensor, tps sensor, sparks , leads, coils, injectors and starter moter.

Please someone know this issue let me know! I love mine.

  • Welcome to Motor Vehicle Maintenance & Repair! What is the year/make/model/engine of the car you're talking about? – Pᴀᴜʟsᴛᴇʀ2 Oct 25 '18 at 23:33
  • Overly advanced timing at idle? Bad/clogged Idle air control? I do want to know where you get 98 octane . . . somewhere far away, I suspect. – SteveRacer Oct 26 '18 at 3:05
  • 2004 Mitsubishi challenger – Shi Oct 26 '18 at 5:16
  • Air control moter changed. – Shi Oct 26 '18 at 5:17
  • At idle rpm just drop 100? Then back – Shi Oct 26 '18 at 5:18

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