1998 TOYOTA COROLLA MOTOR MANAGEMENT OR KNOCK SENSOR

  • Tiny
  • dan dan
  • 1998 Toyota Corolla

1998 Toyota Corolla 4 cyl Automatic 170000 miles

I recently purchased a set of Halo spark plugs (said to improve mpg by about 10%), and discovered afterwords on their warenty that the timing will need to be adjusted. It sounds as though a motor management system or knock sensor (are those two different things, or the same thing with two names) will adjust the timing automagically as long as I disconect the battery before instalation. Does my car have a motor management system or a knock sensor? If not, how easy is it to get the timing adjusted? Thanks

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Monday, July 28th, 2008 AT 12:46 PM

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  • Tiny
  • mmprince4000
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  • 8,715 posts

Timing is controlled by the PCM (Power train Control Module). The knock sensor retards timing when it detects pre-ignition.

What they are saying, I think, is that if you disconnect the battery the PCM will re-learn engine parameters (timing/fuel) based on feedback from the engine sensors.

Unless equipped with a distributor, base timing in not adjustable.

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Tuesday, July 29th, 2008 AT 6:35 AM

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