It depends on the type of ignition system you have. Some have ignition coils at each spark plug, or coils for each plug away from the plug, or coils for every 2 plugs, or a single coil for all plugs. So the coil could be bad, or perhaps simpler the spark plug wire could be bad, or a bad spark plug. If you have a distributor it could be the cap or the signal rotor. There are other possibilities including the Electronic Control Unit, and electromagnetic interference (not likely).
Depends four cylinders have 4 and six cylinders have 6 is the only two motors the optima have.
If you are aware of which two cylinders are NOT firing, I would change out the spark plug wires and the spark plugs with brand new for those two cylinders. If you aren't sure which cylinders AREN'T firing, then do a complete change of new wires and spark plugs. HINT: Try not to use Bosch plugs... I did, and had all kinds of trouble with them even tho they were inexpensive and supposed to be just as good.
I really hate to be the one to tell you the bad news but it is possible that you have bent some valves. Take the spark plugs out of the missing cylinders and run a compression check on those two.
Bad spark plug or plug wires. Can also be a burnt valve on those cylinders.
Are you asking about an engine misfire? If so you can use an inductive timing light to determine which cylinder is not getting any spark. Misfire could be caused by: Bad spark plug. Bad spark plug wire. Bad coil. If it is the coil then two cylinders would misfire.
The Kia spark plug wire kit has only two wires. What about the other two cylinders?
The spark plug wiring is fairly simple; first note that cylinders are labelled 1 - 4 from left to right while sitting on the seat facing forward. There is a coil for cylinders 2 & 3 and a coil for cylinders 1 & 4. The spark plug wires normally have a tag labelled 1- 4 on them but if not see below. * coil for # 2 & 3 cylinders have the two spark plug wires that are normally closest in length - the wires do not have an order as long as the come from the 2/3 coil and can reach the 2 & 3 cylinder. * coil for # 1 & 4 cylinders will have either two wires that are longer than the wires on the 2/3 coil or one really long spark plug wire and one short spark plug wire. The spark plug wires also do not have an order as long as they reach the spark plugs.
A 2004 Hyundai Santa Fe 2.4 has two spark plug wires, for cylinders #1 and #3. Cylinders #2 and #4 use what's known as "spark plug connectors" or "coil to plug boots".
Could be,Firing order is messed up.Ignition module is bad.Bad spark plug wires.Bad spark plugs.
The "V" in "V-Star" specifically means V-twin. (All these bikes are V-Twins.) This is the cylinder configuration of the engine (The cylinders form a V shape). Most models of bike whos names begin with V have engines of this type. Some have four cylinders (V-Four), others have two (V-Twin). VFR and VTR for example. Since only one spark plug is necessary per cylinder, a V-Twin (having two cylinders) only has two spark plugs. A V-Four, on the other hand, has four. Similarly, V-6 and V-8 engines have 6 and 8 cylinders / spark plugs respectively. Any engine will have the same number of spark plugs as it has cylinders.
When two cylinders meet or come close to each other, there is a risk of compression injuries, such as getting trapped between the cylinders or crushed by them. Additionally, there is also a risk of the cylinders getting entangled, causing instability and potential for them to fall or roll unpredictably. It is important to maintain a safe distance and use proper safety precautions when working with or around cylinders to prevent these dangers.
There is not a distributor on a Mitsubishi Mirage. It uses two coils that are located on top of the valve cover. one coil provides spark for two cylinders.