my friend noticed i get 10mpg in the city and suggested i change my spark plugs, since i changed oil/filter and air filters. having bad spark plugs can cause misfires, but i dont know if my car is misfiring at all. should i change the sparks? or how can i tell if its misfiring?
Does changing usable spark plugs save gas?
As said to your other question, you do not have a misfire.
Does changing usable spark plugs save gas?
No, but you can improve your gas mileage by buying the crappiest, cheapest air filter you can find.
Newer engines (1996 forward) dispense fuel based on how much air is entering the engine.
Shoving an old sock in there (whatever have you) is called %26quot;cupping the engine%26quot; and forces it to conserve fuel to avoid running rich.
For regular copper plugs:
Every 20,000 thousand miles change spark plugs
For Platinum plugs:
Every 50,000 thousand miles change spark plugs
For Iridium plugs:
Every 100,000 thousand miles change spark plugs
Yes you can get better gas mileage if your plugs are working correctly.
Good luck.
^^ yeah, pull them out and read their condition. You could be running rich, that maybe a oxygen sensor problem(if you have one). One of your injector maybe leaking(if you have one).
The spark plug's condition can tell you what is going on.
Because of cityc driving and low mileage I would say yes change them It sounds like you don't drive a lot, get out on the higghway and run it up to high speeds it's good for it once in a while.
Without knowing how old the current plugs are, no one can answer this question. However, spark plugs are cheap for most vehicles and it certainly wouldn't hurt to change them...
Only way to know is take em out and look at them
