1987 Corvette Roadster, stock 5.7 TPI with 38000 original one owner miles. Recently the Check Engine Light came on and the Engine fell flat on its face, rough idle, power loss..etc. I attempted to Code using a hand held unit from auto parts store that simply bridges over the connector and then you read the codes. At first the Check Engine light would not flash..but remained constant, suggesting another problem. But...after clearing computer by removing ground cable on the battery, the portal allowed access and the Check Eng. Light coded the standard code 12 with no other codes available as the system was cleared.

But, after the computer was cleared...the Engine started and ran normally...UNTIL the FAN CAME ON about 115 degrees. Its always the same results...if you clear the computer, allow engine to cool below where the fan will not come on, the ENGINE and computer both work normally, but once the fan comes on...the Computer Access Portal will not engage the computer..the check eng light simply stays on a engine crashes until cleared again. Any suggestions or help would be greatly appreciated

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