Every type of engine will have a different mechanism for its firing order, which is a sequence for how the spark plugs get ignited inside the engine. If the engine has a distributor, the mechanism for the firing order will be based on the routing of wiring that goes from the distributor cap to the spark plugs located on each cylinder. On engines where the piston is located at the top dead center (TDC), you should notice that the alignment for the distributor rotor will correlate with the number one (#1) spark plug terminal. Chrysler vehicles equipped with a V8 engine will have distributors that rotate clockwise for the firing sequence to ignite the next spark plug in the cap.
The #1 cylinder on most vehicles produced by Chrysler is usually located on the left side of the vehicle especially if the vehicle uses a rear-wheel-drive mechanism. For vehicles with a front-wheel-drive feature, including minivans with V8 engines that have 2.7 L and 3.5 L of oil capacity, the #1 cylinder should be located on the front right side of the vehicle. Meanwhile, the #1 cylinder will be located at the front left side if your Chrysler vehicle is a truck that has a V8 3.9 L engine.
Most Chrysler vehicles also use a staggered sequence for the spark plugs. This means that the spark plugs with odd numbers will be located on one side while the spark plugs with even numbers can be found on the other side.
Chrysler V8 and V6 Firing Orders
Chrysler vehicles featuring 5.9L, 6.1L, 6.2L as well as 6.4L V8 Hemi engine using fire orders 1-8-4-3-6-5-7-2.
Older Chrysler vehicles with types of 273, 318, 340, 360, 383, 392, and 426 using fire order 1-8-4-3-6-5-7-2.
Jeep Grand Cherokee, Dodge Dakota, Commander, Durango, and RAM vehicles using fire order 1-8-4-3-6-5-7-2.
Chrysler vehicles featuring V6 2.7L, 3.0L, 3.3L, 3.5L, 3.8L using fire order 1-2-3-4-5-6.
Dodge Dakota or RAM trucks featuring a V6 3.9L engine using fire order 1-6-5-4-3-2.
Dodge, RAM, Jeep, or Durango vehicle featuring V6 3.7L engines using fire order 1-6-5-4-3-2.
The performance of the engine will also depend on the correct sequence of the firing order. This is because an incorrect firing order may be able to cause frequent backfiring and will prevent the ignition system to start the engine. Meanwhile, it can also cause poor performance in the engine.
For vehicles that aren’t equipped with an ignition system featuring a distributor or coil-on-plug, the firing sequence is usually managed by the engine computer or the ignition module. The crankshaft position sensor will output a signal that will be received by the engine computer which will determine the correct piston that is aligned with the top dead center location. The system will then start that spark plug before firing the others according to the sequence.