There are a lot of things, first of all you need to remember why you needed to change them in the first place.
Improper gap
wires in wrong order
wires not on all the way
wires bad
coil bad
wrong plugs
another problem with engine causing misfire.
Any system can affect the complete combustion which can attribute to a misfire code, not just the plugs themselves. Fuel filter, coil pack, fuel injectors, head gasket issues, O2 sensors, catalytic converters.
I just spoke with a Parts person at a local Toyota dealer. He told me that the 2004 Toyota Matrix requires Iridium spark plugs, which retails for about $12 at the dealership, and it should not need to be changed until 120,000 miles.
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I just replaced the plugs on my 2005 tundra 4.7 v8. they are easy. their is so much room to work with. But do use the genuine Toyota spark plugs. "Do not use aftermarket plugs" i garauntee if you use the aftermarket plugs, you will wreak havoc. the heat range is too high on the aftermarket plugs, and therefore will burn holes in the ignition wires. check eBay for Toyota plugs or your local Toyota dealer.
because it is the spark plugs back firing they need to be replaced
Could be as simple as fouled spark plugs.
There better be. I just spent a little over $40.00 getting them replaced.
most plugs are gapped different depending on the vehicle. the plugs dont have an order of replacement but just keep an eye on the wires and make sure you stay the same to keep the firing order
Try to use Toyota speaker adapter plugs so you don't need to cut wires and mess the electric system up. You can get them from Ebay or Amazon.
Yes, you still need to make sure that the plugs are firing when it's their turn.
if its turning over but not firing make sure you have the right firing order, i had that happen to me onve, i replaced everything and then turned out i had two cylinders backwards
A 2007 Toyota Prius has 4 spark plugs.
position of spark plugs on 2003 Toyota coralla