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Thread: spark plugs

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    Quote Originally Posted by bigb_gr8 View Post
    does spark plugs effect fuel efficiency ?
    my cars plugs (iridium) have done 100k km
    Yes spark plugs greatly effect fuel efficiency, furthermore if u feel muchvibrations when put in D or R, it may be due to spark plugs

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    Quote Originally Posted by bigb_gr8 View Post
    does spark plugs effect fuel efficiency ?
    my cars plugs (iridium) have done 100k km
    Normally the change interval is 50K miles or lets say 70~80K km.
    There can be two possible solutions.

    If there is no misfire yet, then you may keep them running unless some problem appears. (Because there were few examples where iridium spark plugs crossed the 100K mileages and still working fine).
    Or you can replace them with new. Because weak plugs may bring bad fuel average though not misfire yet.
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