Honda Insight Forum banner

denso

  1. Denso Iridium spark plugs, identification, indexing

    Problems and Troubleshooting
    1. Are the specs on Denso 3421 (SK20HR11) iridium spark plugs the same as the specs on Honda OEM plugs for the MT 2000 Insight? I had new plugs installed by mechanic and car seems to be misfiring along with MPG now 30-50 (was 50-80mpg). I thought that could be the cause. I believe I have the...
Top