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First, run a compression test. Mark the sparkplug wire positions with tape or wire markers, then pull all spark plug wires and sparkplugs. Examine the plugs as you remove them, looking for one plug that is damaged or fouled. Next use a compression gauge to test the compression on cylinder 1, crank the engine then record the compression of the cylinder. Next move to cylinder 2, 3 and then 4. If any compression level is much lower than the rest, you probably have a burned valve and you'll need major engine repair to stop the misfiring. If compression is ok, but you have 1 or more fouled sparkplugs, replace ALL plugs and plug wires, making sure to connect the new plug wires back in the same order as the old ones, also making sure that the plug GAP is set properly. If it still misfires check the computer codes using a computer diagnostic code reader. You can borrow, rent or buy a code reader from most auto parts retailers. Many will even help you connect the code reader and interpret the results.

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โˆ™ 2006-12-02 08:40:22
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Q: How do you stop a 1992 Saturn SL from misfiring?
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