P0302 Multiple misfire cylinder 2

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hydelake - 14 May 2008 01:01 GMT

OK, my 1999 camry has thrown a P0302 code. I've changed plugs,wires,
and swapped coils-- no luck same code. I'm about to change the
injector which will probably fix the issue but here is my question.
How does the computer "know" that a specific cylinder has misfired. By
that I mean what sensors are involved in the diagnoses by the computer
that a misfire has occurred? Thanks for any information.

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Tegger - 14 May 2008 01:51 GMT

hydelake <b4urtaiken@gmail.com> wrote in news:ff6a9556-480c-4125-b842-
c3f8ae23dc22@d77g2000hsb.googlegroups.com:

> OK, my 1999 camry has thrown a P0302 code. I've changed plugs,wires,
> and swapped coils-- no luck same code. I'm about to change the
> injector which will probably fix the issue but here is my question.
> How does the computer "know" that a specific cylinder has misfired. By
> that I mean what sensors are involved in the diagnoses by the computer
> that a misfire has occurred? Thanks for any information.

Get a compression test done.

To an OBD-II computer, "misfire" means nothing more than that the
crankshaft has failed to accelerate consistently with each cylinder's
firing impulse. The crank angle sensor tells the computer which cylinder/s
is/are lagging.

You might have excellent combustion but poor compression.

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Tegger

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