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Was there a reason for changing the spark plugs, was it giving you a misfire code? I have an 08 mazda 6 and I've changed the spark plugs before without any problems, if the engine is rattling and shaking it may be a misfire from a faulty plug or a bad coil pack atop the spark plug. You should be getting a Check engine light on the dash if so take it to a local Autozone or Advance Auto Parts, they'll check the code for free.
Nowadays, I've seen spark plugs last 100,000 miles. The center electrode in a spark plug will wear down, causing a wider gap between the center electrode and side electrode. This wider gap causes harder starts, and if wear is too excessive, it will cause a no start. Hope this helps, Gary
1) let engine cool down all the way
2) pull plug wires off plugs one at a time.
3) remove plugs with proper spark plug socket.
4) replace plug
5) replace wire
6) move to next one.
In servicing the spark plug . If the owner will be the one to change the spark plug then. the owner should locate the spark plugs . then prepare the equipments that is going to be used to change spark plug .First disconnect the spark plug cable to the spark pug . Then use the equipment to take the spark plug off to the engine. The spark plug should be twisted counter clock wise using the equipment to remove the spark plug.Then replace the spark plug.In returning the spark plug ,using the equipment you have to twist the spark plug clock wise . Then set the distributor shaft turn it according to the proper firing order that will be set to the spark plug if it is 1,3,4,2. Then the distributor shaft mark will be on 1.If 2,3,4,1 then the distributor shaft mark will be on 2. Then connect the spark plug cable , after connecting the owner have to test start the car so that to if it back fires .If it back fires then the owner have to repeat again the setting of the firing order of the spark plug until it will not back fires.If the owner don't have time to do the job in servicing or changing spark plug then the owner have to go to a car mechanic and let them change the spark plug.
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