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2003 Mercury Grand Marquis

Question: small spare tire

Question

hunterforever, Ridgeway, SC, March 11, 2011, 10:11
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 Rookie

the small spare tire makes the computer go crazy and smoke comes from around the wheel. What is the problem? It workes fine when I put the regular size tire back on.

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  • Answer #1

    torque wrench from Stewart's Auto Repair LLC, March 11, 2011, 10:56
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     Master

    Sounds like the tire is the wrong one for your model car and many be rubbing something to make the smoke. As for the computer going crazy, the wheel speed sensor is showing it is going faster then the other wheel.

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  • Answer #2

    patrick mannion from Greg Solow's Engine Room, March 11, 2011, 11:08
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     Master

    Torque wrench is absolutely right. Car manufacturers calibrate in the space saver tire size, if it is on the car the Anti lock brake system looks at the revolutions of the wheel and knows if the correct 'Space saver" tire is on. If a full size spare fits in your wheel well go to a wrecking yard and get a second hand full size spare.

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