4.6L (1996-2004 Modular) MustangTechnical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within. Sponsored by Cruizin Concepts
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recently changed spark plugs, huge loss of mpg and car idles
So my car jerks around 35-45 mpg so i thought maybe it might be a bad spark plug so i decided to change them.. well first of all it still jerks, second my car idles now when its on drive or reverse, it seems to have lost power and 4th theres a huge loss of miles per gallon... maybe i installed spark plugs wrong or theres a bad spark plug? Any idea what it can be? Oh and the Car is a 2000 mustang gt automatic
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I checked them out yesterday abd it idles alot less the coils and wires looks good and even the spark plugs.. how tight are the spark plugs suppose to be?
You tighten them kind of the same way as an oil filer. Just barely past hand tight. Make you use anti seize on the plugs, too. Are they gapped properly? You could also have a bad/dirty mass airflow sensor, too.
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