Spark plug cylinder - 2005 Hyundai Sonata

The carburetor is actually two with a common air intake and fuel bowl yet separate jets and and manifolds to each cylinder.

Disconnect plug wires and crank for a few seconds. Promptly remove both spark plugs and compare. Likely one will be wet (good cylinder) and the other dry (bad cylinder).

If both plugs are wet then could be no spark under compression.

In general spark plugs are usually all the same on an engine regardless of how many per cylinder. If this is the 100cc Revtech Motorcycle engine it will have ONE spark plug on each cylinder. What did you mean by a "compression plug"?

Do you have spark at cylinder 2? If not, check spark plug wire or spark plug. Another possibility is the ignition coil pack (the thing your spark plug wires run in to). Hopefully that is not the issue because they are expensive new. An easy way to check is to pull the spark plug out of the engine then reconnect it to the spark plug wire. Turn the engine over and check for spark at the end of the plug. WARNING: don't touch the plug unless you like pain. You can always buy a spark plug tester. Anyway, this will determine if you have spark problems with this cylinder.

couple of possibilities one is that the spark plugs themselves are grounding the insufficient gap so it's not actually generating a spark other possibility is the spark plug boot or tube is our King instead of the spark plug I had two similar situation on a6 cylinder car one of them the piston ended up touching the spark plug and broke the gap another one was that the spark plug boot the long boot going into the cylinder head itself had a voltage Leak and was arching against the cylinder head good luck

REMOVAL PROCEDURE

1. Remove the ignition control modules.
2. Clean the spark plug recess area with low pressure air.

CAUTION: Wear safety glasses when using compressed air, as flying dirt particles may cause eye injury.

NOTE: Clean the spark plug recess area before removing the spark plug. Failure to do so could result in engine damage because of dirt or foreign material entering the cylinder head, or by the contamination of the cylinder head threads. The contaminated threads may prevent the proper seating of the new plug. Use a thread chaser to clean the threads of any contamination.

1. Remove the spark plugs from the cylinder heads.

NOTE: Allow the engine to cool before removing the spark plugs. Attempting to remove the spark plugs from a hot engine may cause the plug threads to seize, causing damage to cylinder head threads.

1. Inspect the spark plugs. Refer to Spark Plug Inspection.

INSTALLATION PROCEDURE

1. Measure the spark plug gap on the spark plugs to be installed. Compare the measurement to the gap specifications.

NOTE:

• Use only the spark plugs specified for use in the vehicle. Do not install spark plugs that are either hotter or colder than those specified for the vehicle. Installing spark plugs of another type can severely damage the engine.
• Check the gap of all new and reconditioned spark plugs before installation. The pre-set gaps may have changed during handling. Use a round feeler gage to ensure an accurate check. Installing the spark plugs with the wrong gap can cause poor engine performance and may even damage the engine.

1. Install the spark plugs to the cylinder heads.

NOTE:

• Be sure that the spark plug threads smoothly into the cylinder head and the spark plug is fully seated. Use a thread chaser, if necessary, to clean threads in the cylinder head. Cross-threading or failing to fully seat the spark plug can cause overheating of the plug, exhaust blow-by, or thread damage.
• Refer to Component Fastener Tightening Notice in Service Precautions.

Tighten the spark plugs to 20 N.m (15 lb ft) .

1. Install the ignition control modules.

I would first pull the spark plug from that cylinder and check the ground electrode to make sure it doesn't visably look fouled. I would then (if you haven't already) leave the spark plug out of the cylinder, attach it to the plug wire and place it somewhere where you can see and inspect for a spark while someone cranks your motor over. You should have a white or blueish colored spark if it;s good or a red/orange if there is a weak spark. If you have a weak spark take out another spark plug and test it in your problem cylinder, if you now get spark it was a fouled plug if not you may also try the first plug on the other plug wire from the second spark plug you removed to rule out a bad plug wire. If you're 0 for 2 at this point you may have a problem with the ignition coil or the wiring going to the ignition coil for that cylinder.

Your car is 4 cylinders that means its has 4 spark plugs if its 6 Cylinders that means you have 6 park plugs and if its 8 Cylinders That means you have 8 spark plugs and if you have 12 Cylinders that means you have 12 spark plugs. Every cylinder has a spark plug. Hope this helps and if you got more questions Feel free to ask. Good luck

1. Spark plugs removal

1.1. Front cylinder bank spark plugs removal:
1.1.1. Disconnect the battery from car terminals.
1.1.2. Remove the engine plastic cover.
1.1.3. Disconnect the ignition coils electrical supply cable and all three coils connectors.
1.1.4. Remove all three ignition coils screws.
1.1.5. Remove all three ignition coils out from cylinder head.
1.1.6. Remove all three spark plugs out from cylinder head (straight forward).

1.2. Back cylinder head bank spark plugs removal:
1.2.1. Remove the inlet manifold out from cylinder head.
1.2.2. Disconnect all three ignition coils connectors.
1.2.3. Remove all three ignition coils screws.
1.2.4. Remove all three ignition coils out from cylinder head.
1.2.5. Remove all three spark plugs out from cylinder head (straight forward).

2. Spark plugs installation

2.1. Refit all in reverse order.
2.2. Spark plugs tightening torque = 2,8 +/- 0,3 daN.m
2.3. Ignition coils tightening torque = 0,8 +/- 0,2 daN.m

This is a fairly easy job. Do each cylinder one by one (removal and install), make sure to reinstall the coil on the same exact cylinder (DO NOT MIX UP). 1. Remove coil retaining scre 2. Pull upward on the coil to remove. 3. Remove spark plug (using a spark plug socket). 4. Properly gap new spark plug (if applicable). 5. Apply sprark plug anti-seize compound on plug threads. 6. Install plug. 7. Aplly coil boot grease on the coils' rubber boot tips. 8. Reinstall coil.

Subaru engines (including Legacy and engines of many other automobiles, GM, etc.) have returned to so-called wasted spark ignition systems since advent of the electronic distributor-less ignition (having been used historically in early engines with magneto ignitions). With this approach, the ignition systems are less expensive and usually quite reliable. At the same time, however, a shorted spark plug (cracked or carbon clogged, etc.) (or bad ignition spark plug wire) grounds both the ignition spark and the false spark being used. This means that it also grounds the corresponding respective ignition spark of the other 180 degree out of phase cylinder (that uses the same the same coil because the spark current is connected to the spark plugs of two cylinders). Since such a defect allows more current to flow in the spark coil to two plugs when the resistance of the spark plug gap disappears due to a cracked plug, etc, it seems likely to hasten coil burn out if the spark plug/plug wire defect is not corrected before installing the new spark coil.

To explain further, wasted spark means that when a cylinder is ready to fire, it gets a spark to its spark plug while part of the spark (from the same coil and current) as a sort of copy is also sent to another cyclinder at the same time but when the piston in that cylinder is exhausting its ignited gases 180 degrees out of phase from when its spark is needed. When the second cylinder is ready to fire and receives its "spark, the first cyclinder the also receivesa "wasted" spark "copy" of the one needed by the second cylinder. Economy is achieved in manufacture because otherwise electronics would have to turn on and off four different spark coils to distribute four different sparks as needed to the four cylinders. With wasted sparks (which are cheap), because the spark current of one coil is connected (internally in the ignition coil unit) to two cylinders that are in the same position but 180 degrees out of phase in firing, the system can turn on and off two spark coils twice as fast with half the electronics and fire two cylinders that are 180 degrees out of phase. A four cylinder engine thus uses only two coils, a six cylinder engine, three coils, etc., in a wasted spark system.