Ignition coils are part of your Toyota Aqua's ignition system and physically connect to or sit atop spark plugs. Also known as compact electrical transformers, they transform the 12-volt current in car batteries to a higher voltage necessary to create a spark and start your engine. Most Aqua engines use one coil for each cylinder, although some ignition systems of older vehicles utilize just one coil for all of their cylinders.

The following may be signs that you have a faulty ignition coil(s):

1) Poorer fuel efficiency than usual.
2) Illuminated "check engine" light possibly caused by faulty coils that trip the engine computer.
3) Your Aqua refuses to start. (This behavior would be less common since all the coils in each of the engine's cylinders would have to fail to transform the current necessary to produce the spark.)
4) Rough idling and engine jerking.
5) Backfiring, which occurs when unspent fuel in the combustion cylinders leaves through the exhaust pipe.

BE FORWARD Auto Parts stocks Coil-On-Plug (coils that sit on top of the spark plug) and Coil-Near-Plug (those connected by wire) ignition coils used in engines of most Aquas. Buy one in great condition and at an affordable price with BE FORWARD Auto Parts now!