23 Mar 12 14:13, Mark Hofmann wrote to Roger Nelson:   
      
      
      
    RN>> Admittedly I've been away fromm this stuff for quite some time, but   
    RN>> I have yet to see a spark plug that would last 145k.  The ones I   
    RN>> bought for the Mark VIII have a recommended replacement of 75k.   
    RN>> I've only put 12k on the car since I bought it, so the ones I put in   
    RN>> it 2 years ago should last awhile longer, I think, unless all this   
    RN>> city driving I do shortens that life span, which I'm sure it will.   
      
    MH> I'll have to take a picture of them once I remove them from the   
    MH> truck.  :)   
      
   Note the brand name too.   
      
    MH> I assumed that they last longer due to most engines being fuel   
    MH> injected and computer controlled these days so there is less chance   
    MH> of running "too rich" or "too lean".   
      
   Too rich and too lean are the new-age way that is used to keep them in   
   good shape for as long as they can still get a spark across the ever   
   widening plug gap...consider the rest of the sensors that keep the ECM   
   informed about how much air is passing through the throttle body, how much   
   Oxygen remains in the exhaust gases, etc.. All of that info is used by the   
   ECM to open the injectors and keep them open to regulate the air fuel   
   ratio to make the engine run at its best efficiency.   
      
    MH> Unless the original owner changed the plugs before 63k (which I   
    MH> doubt), they have never been changed.  It has 145k on it right now.   
      
    MH> I ran my original plugs in my Monte Carlo over 100k, too.  On that   
    MH> vehicle, I do have a distributor however.   
      
   The big difference being that it has only one coil to fire 6 cyl.   
      
      
                   R\%/itt   
      
      
     ... Only those who will risk going too far can possibly   
     ... find out how far one can go ~ TS Eliot   
      
      
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