03/10/2026
A Honda odyssey owner said her engine sounded rough and she didn’t have a lot of power when accelerating.
After doing some diagnostics on it I found that it had misfire codes for 4 of the 6 cylinders.
Upon taking out the spark plugs it was pretty clear why it was misfiring so bad. 3 of the spark plugs were cracked or missing some ceramic insulation and all were pretty dirty.
When your spark plugs start to go bad your MPG will drop. Sometimes a lot some times not much but replacing them at the millage that the manufacturer recommends helps a lot.
