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Your spark plugs provide the spark needed to get the petrol in your engine to burn. If a spark plug isn't working properly, it won't spark, so the fuel won't burn and the engine won't run properly. It will feel rough, you could lose power, have problems starting, etc.
For a 206 these should be changed roughly every 40,000 miles or 4 years, whichever comes first.
How you change them depends on your engine size, if you tell me I can give you the procedure. Or just take it to a garage, a new set of plugs cost around GBP16-24 depending which ones you buy, they shouldn't charge you much to fit them as it's a 15 minute job.
CHANGE SPARK PLUGS.YOU NEED SPARK PLUG 3/8 SOCKET.YOU NEED SHORT AND LONG 3/8 EXTENSIONS.YOU NEED SPARK PLUG BOOT PULLER AND A SPARK PLUG GAUGE SET THE SPARK PLUG GAP.NOW CHANGE 1 SPARK PLUG AT A TIME SO YOU MIX THEM UP GET FIRING ORDER MIX UP CAR BACK FIRE WONT CRANK.ALSO CHANGE PLUG WIRES ALSO.
Spark plugs like any electrical device become worn over time. Spark plugs also work under extreme condition. The use of cheap fuels will leave deposits, poor maintenance, bad air filters, old plug wires, all these items can cause a spark plug to fail or not perform at its peak level. Also spark plugs use a gap or Electrical bridge that is used for high voltage to arc across. The larger the gap the hotter the spark until you reach a point that the coil can not bridge the gap and then you get a misfire. Also when a plug gets deposits from either oil, poor fuel, carbon this will shorten the gap and cause a weaker spark resulting in poor performance, wasted fuel and engine dieseling or Run on after the ignition is turned off. These are the simple reasons for spark plug replacement.
you will need
5/8 spark plug socket
3/8 extension (it could be 4in and longer)
and spark plugs factory plugs are pregap iridium
spark plug torque is 13.0 lb.ft
coil torque 8.7 lbf.ft
spark plug part # NGK 1zfr5k-11
# DENSO pkj16dr-m11
and spark plug anti seize on spark plug thread
what you need to do is remove the plastic cover 8mm socket or 10mm sockets
now remove the spark plug covers and remove the spark plug coils too 10mm head bolt you will need a 5/8 spark plug socket and a 3/8 ratchet and a 3/8's extension too
you need OEM spark plugs they work the best
hope this will help
on the 3.1, it is easier to change back plugs if you remove the coil packs. so you can reach the plugs from the top of engine. it almost seems impossible but this will work. it will give more room to work.
FIRST OF ALL YOU HAVE CHANGE SPARK PLUGS WHEN ENGINE IS COOL.IF YOU CHANGE THEM WHILE ENGINE IS HOT YOU COULD DAMAGE THE ALUMINUM HEADS OR CAUSE DISTORTION.TO CHANGE SPARK PLUGS YOU NEED A SPARK PLUG SOCKET.A TORQUE WRENCH.ITS NOT MANDATORY.BUT IT WILL KEEP YOU FROM OVER TIGHTEN SPARK PLUGS.YOU NEED A 3/8 RATCHET AND EXTENSION.YOU ALSO NEED A SPARK PLUG GAP GAUGE.AND SPARK PLUG BOOT PULLER.YOU ALSO NEED SOME ANTI SEIZE COMPOUND.TO PREVENT DAMAGE THREADS WHEN INSTALLING THE SPARK PLUGS.
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.