Question about 1985 Chevrolet Corvette

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I have a 1985 corvette and i just recently did a tune up to it . the problem is that it back fires through the exhaust. the car before had split fire plugs and it didnt do the back fire but since i changed the plus to ngk it back fires , so if u can give me a solution to this problem . oh and it back fires on idle speed . but i havent changed the cheap gas that has been there sitting and i have to put premium for this type of car so what can be the problem

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  • jmt456 Oct 12, 2010

    what do you mean by check firing order

  • jmt456 Oct 12, 2010

    but if everything is in the right place and good and still does back firers should i put the old plugs that i took out which were split fire and buy them new

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  • 148 Answers

Did you change one plug wire at a time? you may have two crossed , you should double
check the firing order.

Posted on Oct 11, 2010

  • jmt456 Oct 12, 2010

    what do you mean by checking the firing order like what is that

  • JOHN ALBURY
    JOHN ALBURY Oct 12, 2010

    The plugs are connected thru the plug wires to the distributor , they must in the proper
    place on the distributor cap .
    If you only changed the plugs and reconnected them as you found them , the firing
    order should be the same.

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SOURCE: 1985 corvette - it back

You might check to make sure the plug wires are not on the wrong plug.
Also make sure the plg wires are not damaged from pulling on and off.
There are other things to check depending on what things you did to do the tune up

Posted on Oct 11, 2010

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4bc53d4.jpg
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