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Engine ignition timing/modern cars

Tiny
GANCHO
  • MEMBER
  • 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?
Tuesday, December 7th, 2010 AT 6:14 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,758 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
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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
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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
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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
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https://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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