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Discussion Starter · #1 ·
Just changed my plugs. 142,151 miles on my colorado and iv never changed them till now.. What the average mileage all u guys change yours plugs.. Imma start every 25-30,000.. And does anyone see and jump in mpg on are 5 cylinders when the plugs r changed


Teddy
 

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Without having changed plugs myself, I'd have to guess no mileage increase. If the truck ran normally before hand, then they were not to the point where they were inefficient. An investigation of the plugs you pull can help tell too. Were they tan in color, and pretty equally gapped across the 5? Did the electrodes appear damaged in any way?

The computer should have controlled a good fuel/air mixture. The plugs should have fired well if they were not damaged, just as well as the new ones will.
 
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