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Re: Error 7 Flash - 1 Pause
I've got an '89 too.
Are you sure about the 7 flashes?
It should give you 1 flash, pause, two flashes (three times), which indicates the PCM is working correctly.
Then the fault code should flash. I don't see a fault code lower than 13 in my haynes manual.
To answer your question, a vacuum problem could be related. Check the hose to the MAP sensor.
And just for good measure, inspect all the vaccum hoses.
Also, could be the EGR valve, or the vaccum hose connected to it. Since it belched out a bunch of black smoke, you may have a carbon build up problem.
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