Spark plugs & problems associated

15

Asked by 04SubaruForesterXS Aug 20, 2020 at 08:18 PM about the 2004 Subaru Forester XS

Question type: Maintenance & Repair

Would bad/failing spark plugs cause a rattle while
accelerating at slow speeds?

3 Answers

48,060

Do you have a CEL for a misfire? If not then indeed I'd secure or tear off loose heat shields before digging deeper. You've got at least a dozen exhaust points that can rattle under there. Bang on them with a rubber hammer to test, and then secure, tear off, or pin with long nails to bind shields away from inner pipes.

48,060

If shields are quiet and you have a SHUDDER and stumble upon acceleration look for a spark-damaged white spot on any ignition wire dressed too closely to the intake manifold's metalware. Damp weather will increase chance of incidence. Report further. Ern

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