Question about 1985 Chevrolet Corvette

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85 CORVETTE WHEN I CRANK THE MOTOR OVER IT HIT OFF AND ON LIKE A TIMING PROBLEM, BUT WHEN I GIVE ABOUT 1/4 THROTTLE IT STARTS. IDLES EXTREMELY ROUGH OR NOT AT ALL , BUT WILL REV UP QUITE RESPONSIVELY. I HOOKED UP MY DIAGNOSTIC COMPUTER AND IT BASICALLY TOLD ME MY TPS WAS HIGH ,VOLTAGE HIGH, EGR PINTLE POSITION WAS OUT OF RANGE AND, MY COMPURTE HAD NO CALIBRATION PACK?????? WHAT DO YOU THINK? THANKS

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  • Anonymous Mar 31, 2014

    extremely high idle and high voltage to TPS

  • Anonymous Mar 31, 2014

    high idle and high voltage to TPS

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-did you check the egr valve to se if it is stuck open? it sounds like it. black smoke out the tailpipe?
- was there a code 42 present? if code 42 is present then change the computer.
- the distributor shaft magnet used to crack and cause a false signal for the computer too. remove the dist. cap and rotor. look and see the 8 fingers wrapped arround the magnet on the part under the rotor? look in between the fingers and see if the edges of the magnet are cracked. if so then you just need to replace the shaft assembly or the distributor.
check these and get back to me if needed. Scott

Posted on Sep 29, 2008

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