Question about 1993 Pontiac Grand Prix

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Just changed spark plugs and gapped them at specs now car runs like its missing the plugs i took out were gapped at .060 but the book says gap at .045 what should i do

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Make sure you did not close any of the gaps on the plugs completely. Make sure you did not swap wires. Worst case scenario may have a bad plug. Hopefully you didn't drop anything in the cylinder hole when changing the plugs.

Posted on Sep 06, 2010

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Your owners manual shows .060 spark plug gap.
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It is normal for the electrodes to wear as the plugs age. This increases the distance between the electrodes which in turn leads to a gradual increase in the firing voltage required to jump the gap. The gap on a standard spark plug grows about 0.00063 to 0.000126 inch for every 1,000 miles of normal driving, which means the firing voltage requirements creep up about 500 volts for every 10,000 to 15,000 miles of driving.

The OE Champion plug gap specifications are .048 - .053" or 1.24 - 1.37mm. in accessing and changing the plugs on the PT. They have the same gap specifications as the OE plugs. Most owners gap at .050. We prefer to use the Champion Double Platinum plugs, which are more durable, provide extended plug life, and reduce the need for maintenance, given the difficulty However, if you experienced excessive rough idle with your last set of plugs we suggest gaping the OE and DP plugs to .042 and consider replacing the OE plug ignition wires.

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