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I need the firing order on the left side for disibutor for a 1986 gmc 305

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I need the firing order - ledsled378_143.jpg


Keep in mind, the spark plug wires can be placed in any position (depending on the spark plug wire length) in relation to where the number 1 spark plug terminal is located. In other words, once you assign a port on the cap to number 1 cylinder the rest will follow the 1-8-4-3-6-5-7-2 firing order.

Posted on Aug 07, 2011

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If It's a V-8, it should be 1-8-4-3-6-5-7-2.

The #1 cylinder will be on the front driver side (left side as looking at it from the driver seat). On the same side of the engine will be #3, #5, and #7 cylinders.

The right side will be (starting from the front) will be #2, #4, #6, and #8 cylinders.

Hope this helps.

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What is the firing order for a 1986 buick regal 305 engine


The firing order is the same, 18436572
But, depending on who made the engine, the firing order may go cw or ccw around the cap. You need to check which way the rotor turns when you crank it, then follow the firing order in that direction. Sometimes the number 1 spark plug tower is marked on the cap, if not, put the number one cylinder on top dead center of compression stroke, which ever coil tower the rotor is leading into is number one, then follow the firing order in correct direction of rotation. You driver side cylinder bank should be numbered, 1357 from front to back, passenger side 2468, front to back.
If you replace plugs and plug wires, one at a time, you won't have this problem. Goodluck.

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Correct spark plug wiring diagram


Firing order for a 305 is 1-8-4-3-6-5-7-2. The distributor turns counter clockwise and #1 should be the 5 o'clock position looking down at the top of the distributor.

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Firing order on a 305 on the cap. Got the wires all messed up...


This method is good for the firing order on all chevy small block v8 engines from 265 cubic inches to 400 cubic inches. This would include 265, 283, 305, 327, 350, 400 cu. in. chevy small block v8 engines.

Let's cover some safety concerns first. If you try to troubleshoot a mixed up firing order with the engine running, you could be in for a serious shock,.. literally. You can do it, with certain precautions, but you really don't need to check the firing order with the engine running. You definitely don't want to try checking the firing order if you are wearing any kind of pacemaker or sensitive electromechanical prosthesis. The voltage coming out of the ignition coil is in the thousands. Common sense dictates that you wouldn't stick a knife in an electrical outlet, so you wouldn't want to take chances with being shocked by the electrical discharge from your classic chevy's ignition coil either. See the diagram:


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The firing order, which should be cast into the intake manifold, for the chevy small block V8 is 1-8-4-3-6-5-7-2. The firing order is the numerical sequence in which the spark plugs are fired. The insertion position of each spark plug wire around the circumference of the distributor cap can be found according to a clock face. The insertion sequence determines the firing order. The firing order is followed clockwise around the distributor cap starting from the 6:30 position with the 6:30 position being the number one cylinder spark plug wire.

On classic chevy small block engines that use ignition breaker points instead of electronic ignitions, the number one cylinder is the one immediately clockwise of the small metal sash cover on the distributor cap. The firing order starts here. There is no sash cover on the distributor cap for GM HEI electronic ignitions, and the firing order is the same, but starting at the 5:30 position.
The firing order makes sense if you know how the cylinders are numbered. The number one cylinder is the front most on the drivers side and 2 being the front most on the passenger side. From front to back, the cylinders are odd numbered on the drivers side, and even numbered on the passenger side.

Additional details HERE.

Hope helps (remmeber rated this).

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1 Answer

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If you are lean on the left side that rules out a spark issue so you either have a injector cutting out or a vacuum leak on that side.

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For this models:
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1986 GMC S15/T15 4WD Jimmy 2.8 liter V-6 VIN "R"
1986 GMC S15/T15 2WD P/U 2.8 liter V-6 VIN "R"
1986 GMC S15/T15 2WD Jimmy 2.8 liter V-6 VIN "R"

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Hope helped woth this. Remember rated this help. Good luck.

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Looking at the engine your number 1 cylinder is the front right, number 2 is front left. The right side is 1-3-5-7, the left is 2-4-6-8. As for the number 1 on the distributor it is at the 5 o'clock position (there should be a number 1 or a long dash by that spark plug wire). Firing order is clockwise 1-8-4-3-6-5-7-2

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Firing order is 1-8-4-3-6-5-7-2. #1 usualy points to the #1 cylinder thats front driver side of engine On the cap. Remove the number 1 spark plug and have someone crank a little unitl you hear/feel air. The possition of the rotor is where your number 1 is, go Clockwise to place the wires in the correct order.

Have a good day ahead!

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2 Answers

What is the firing order of a 305 gm starting on what side thanks


1,8,4,3,6,5,7,2. is firing order, distributor rotates clockwise. Standing in front of, right side 1,3,5,7. left, 2,4,6,8.

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