Only spark on number one and four sprakplugs - Grand Voyager Plymouth Cars & Trucks

Check that the contact in the carburettor is open circuit when you're trying to start it. The way the ignition is killed on pull start lawn mowers is by the throttle linkage creating a dead short to the coil (grounding the circuit to the body of the mower). Also check that the spark plug lead isn't damaged, the spark plug is in serviceable condition, the coil wiring is undamaged and connected and the coil pick up itself is mounted firmly. A similar question was posted approx 5 years ago with no response - this could possibly be a manufacturing fault with this brand of equipment.

Which engine do you have in the vehicle? They fitted them with an in-line four cylinder and a V6. The firing orders are different for each version. I'm assuming the distributor has NOT been removed and is set correctly!
**Note, Take your time to make sure you get this right!**
The Four cylinder is the standard 1,3,4,2, firing order with number One being the nearest cylinder, (spark plug), to the belts and pulleys on the engine. Use the plug leads as a guide as they should be four different lengths. The longest plug lead to the spark plug furthest away, shortest to the nearest spark plug.
With the distributor cap removed make sure the engine is at Top Dead Centre for cylinder One. Check where the metal tip on the rotor arm is pointing as this is where the plug lead for Number One should go.
Refit the the distributor cap and insert the lead for the Number One spark plug into the hole nearest where the rotor arm tip was pointing. Now refit the remaining 3 plug leads in the Correct Order, (1,3,4,2,) into the remaining 3 outside holes in a CLOCKWISE direction. The centre hole should connect to the coil pack lead.
A V6 engine uses the same setup BUT a different firing order. (See photo). 1,4,2,5,3,6. In the photo numbers 1 and 4 are nearest the belts and pulleys.
Set your distributor as you would for the four cylinder engine, fit plug lead one and going CLOCKWISE fit them as the 1,4,2,5,3,6 sequence.

The coil pack wiring is relatively straightforward though the exact wiring, colours and suchlike will vary a little from car to car.

A 4 cylinder engine will have a coilpack containing four individual ignition coils - one for each cylinder, but they are likely to be wired as if there is only two. This is to simplify the wiring and to cut a little unnecessary complication from the ECU.
Effectively those four coils are two pairs of coils - the primary windings of coils one and four are wired in series and similarly the primary windings of coils two and three.

When cylinder number one fires a spark is also generated by coil number four but causes no effect as that cylinder is at the top of the exhause stroke. This is called the wasted spark principle.

The same effect can be obtained by using a single coil per two cylinders of a type which has a single secondary winding which is completely isolated or not grounded in any way. One end feeds one spark plug and the other end is also terminated in a spark plug wire and terminal.

This simplification means the coil pack (4 cylinder example) is fed by only three or four wires (usually four).

I hope this helps.

Have you ever replaced the spark plugs and wires? How many miles? Are the wires secure on the plugs and the coils?

This has a coil pack and four spark plug wires, correct? If so and you have replaced the spark plug wires and you don't have any spark out number four but you have spark on number one than you have a bad coil. You can remove the number four wire from the coil start the engine. Use. Test light connected to ground and place it near the opening in the coil that the spark plug wire goes into. You should see a sharp strong snappy spark. You may find that you have to hold the test light really close to the metal part inside the oil tower to see any spark. If this is the case you have a bad coil. Be careful when checking for spark. There is between 30 - 40 thousand volts generated but the merge is extremely low. If you get zapped it's going to tickle. Bit but it won't kill you. Good luck and let me know what you find.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

fuel mix? new fuel filter? throttle body injection? gasket to it OK? (there have been issues). cheaper grade spark plugs? just listing most common causes of rough idle complaint. also try manually cleaning throttle plate and tweaking up throttle angle screw (aka minimum air rate adjustment)

have you tried a complete tune up?

If it's a four cylinder it has four spark plugs.
If it's a six cylinder (V-6) then it has six spark plugs.
Hope this was very helpful.

This would be the forth cylinder from the front(where the pulleys,and belts are).There will be a coil,and under the coil,is a boot,connected to the spark plug.The miss fire could be any,of the three.I would replace the spark plugs (all four)and the boots.Then if the miss fire is still there,replace the coil,on number four cylinder.

If it's the four cyl., the first coil pack bolts over the #2 spark plug. The #2 coil pack wire plugs into #3 spark plug. The number two coil pack bolts directly over the number four spark plug, and the #2 coil pack wire plugs into the #4 plug. The firing order is 1-4-2-3.