Question about 1988 Chevrolet Corsica
If the idle speed drops to a low enough point when the oil is hot, then the oil pressure light will come on because the oil pump, which is driven by the engine, is not turning fast enough to maintain proper pressure. You'll need to find out why the idle is dropping and almost dying. It could be a bad IAC valve, dirty throttle valve or something like a vacuum leak. It would be helpful if you had a scan tool to monitor IAC (idle air control valve) counts as this is happening as it would help you find the cause. This may be a job for a shop, but don't let them sell you an oil pump until the low idle problem is fixed.
Posted on Aug 20, 2010
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Posted on Jan 02, 2017
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