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If it's weak you might have incomplete combustion or possibly an irratic misfire, but most likely the problem that causes increased emissions is elsewhere. An increase in hydrocarbons is often caused by the O2 sensor or possibly the EGR valve. You could also have a problem with plugs, distributor, rotor or plug wires.

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โˆ™ 2011-09-12 15:16:21
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Q: Could a faulty ignition coil lead to increased emissions?
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