Lean Spark Plugs?

[minime3]

What do lean spark plugs indicate? All i could find out is that it might have something to do with air/fuel ratio, but what causes this?

[Zandro]

What engine do you have V6 I4?

[minime3]

its a 4 cylinder, automatic

[Zandro]

Lean spark plugs can idicate a lot of things: too advanced ignition timing,
low octane rated fuel, wrong plugs (too hot) ect. since you have a cali
5S-FE engine there are emissions related things that could have failed too
resulting a lean mixture.

[minime3]

i have the standard ngk which is recommended, the octane rate is 87 or the cheapest which should be right for my car. i dont know what advance timing ignition means, is that ignition too soon before fuel reaches engine? Someone told me that I have have bad fuel injectors so not enough fuel is getting in. Is that a valid reason too?

[Gary_602Z]

Vacum leaks, injectors and the list goes on! Take it to a good mechanic. Not just someone who wants to throw parts at it! Running to lean is not good on the engine.

Gary

[luisitol]

run fuel system cleaner through your gas tank and injectors. I would suggest Lucas over STP. Also change out your fuel filter. And also have a shop, if you don't feel confident doing it yourself, check your timing. Once all those issues are taken care of you should be squared away.

[minime3]

thanks, thats definitely something i could work with. The fuel filter was changed not too long ago but before i change it again, I will buy the smaller bottle of the lucas fuel and injector cleaner and see how it works first. I will keep you posted on the results. Hope it will do for me what it did for you.