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Spark plugs 3 and 4 have a bad misfire what do you think the problem is.....

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Replace the plugs. if they are fouled than they will misfire. if this doesn't help than have a compression check done on the valves.

also you might replace the wires.

Posted on Aug 07, 2008

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My 07 forenza had a code come up saying misfire on 1 and 4 plug so I replaced coil pack now it's reading #3 misfire and has a sluggish take off.Any ideas are appreciated

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Spark plug misfiring what is the cause

Could be these things, most likely down to the least likely.
1) A bad spark plug wire. They can cause this even though you cannot see it happening.
One way to see it is if you look at the wires on a dark night with the headlights off (so the motor is running in pitch black darkness), sometimes it will show up then.
2) A bad spark plug connector, the part that holds the wire and pushes onto the plug.,
3) A bad spark plug, can misfire sometimes.
4) A crack or hole in the distributor cap, can be invisible unless you try # 1.
5) A bad rotor.
Be blessed.

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How do you know which spark plug is which? on a

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