ENGINE IGNITION TIMING/MODERN CARS

  • Tiny
  • Gancho
  • 2010 Infiniti I35
  • 6 CYL
  • 2WD
  • automatic
  • 9,000 miles

Is it true that modern engine timing is accomplished by constant spark plug firing & ignition timing caused by fuel ingjection controled by computer?

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Tuesday, December 7th, 2010 AT 6:14 PM

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  • Tiny
  • Wrenchtech
  • Expert
  • 20,072 posts

Basically, yes. The computer controls fuel injection and ignition timing among many other things. Most cars have a direct ignition system that doesn't use a distributor and firs 2 cylinders simultaneously.

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Tuesday, December 7th, 2010 AT 6:21 PM
  • Tiny
  • fixitmr
  • Member

1 cylinder is on compression(fires) the other is wasted spark on exhaust cycle.(4 cyl engine)

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Tuesday, December 7th, 2010 AT 6:35 PM
  • Tiny
  • fixitmr
  • Member

Actually the number of cyl is supplied by the number of coils. Each coil having 2 outputs. 4 cyl has 2 coils. 8 cyl 4 coils, 6 cyl 3.

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Tuesday, December 7th, 2010 AT 6:39 PM
  • Tiny
  • fixitmr
  • Member

But no constant spark. Only at TDC for each pared cylinders.

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Tuesday, December 7th, 2010 AT 6:48 PM
  • Tiny
  • Wrenchtech
  • Expert
  • 20,072 posts

http://www.2carpros.com/articles/how-an-ignition-system-works

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Tuesday, December 7th, 2010 AT 6:56 PM

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