89 Celebrity engine light when laboring

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labatyd - 10 Dec 2007 02:26 GMT

1989 Chev Celebrity, 4 cyl. auto 250,000+ km.

Engine light will come on when the engine has to work hard as in climbing a
long grade. It goes away soon after leveling out again. I've tried reading
the code which seem to be code 12 and then four flashes which isn't in my
chart.

Suggestions anyone?
Thanks

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Mike Marlow - 10 Dec 2007 15:57 GMT

> 1989 Chev Celebrity, 4 cyl. auto 250,000+ km.
>
> Engine light will come on when the engine has to work hard as in climbing
> a long grade. It goes away soon after leveling out again. I've tried
> reading the code which seem to be code 12 and then four flashes which
> isn't in my chart.

The code 12 repeated three times is the index marker - you pay attention to
the code flashed in between the repetitions of 12. Are you quite certain it
is just four even flashes? Is there any unequal spacing (timing) between
the four flashes? For example, could it be one flash, pause, three flashes?
That would be an error code 13 which is an O2 sensor error.

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-Mike-
mmarlowREMOVE@alltel.net

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labatyd - 10 Dec 2007 23:24 GMT

>> 1989 Chev Celebrity, 4 cyl. auto 250,000+ km.
>>
[quoted text clipped - 9 lines]
> pause, three flashes? That would be an error code 13 which is an O2 sensor
> error.

I'll check it again. One mechanic suggest plugged catalytic converter.

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