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MY FIRING ORDER IS GOTTA BE OFF ON MY 1990 CHEVY TRUCK. 305 (5.0) V-8 . WHERE DO YOU START COUNTING FOR THE #1 PLUG POSITION. THERE IS 1 RIDGE LINE IN BETWEEN TWO WIRE POSITIONS ON THE DISTRIBUTOR. IS THE #1 RIGHT OR LEFT OF THAT RIDGE LINE? OR DOES IT START BY WHAT WAY THE DISTRIBUTOR'S FLAT/SQUARE WIRE SIDE IS FACING?

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First you need to turn the engine over by hand (Socket on the crank pulley) until the arrow points to the zero. (Top dead center) Now keep in mind that while turning it clockwise facing the engine, you remove the number one spark plug, (Drivers side front) and just before you are at zero, you should feel air pressure with your finger in the spark plug hole.
If you dont, rotate the crank one more time. (This happens every other turn of the crank.)
Now remove the cap, and your rotor should be pointing at the number one spot for the plug wire.

Posted on Jul 19, 2010

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1 Answer

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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Could someone please exsplain this small little problem to me Thankyou Im trying to figure out the fireing order on my 305 chevy engine they give me the fireing order of the plugs but not the dis trib


You need to start by turning the crankshaft pulley to TDC (top Dead Centre) There should be an alignment mark on there for reference. Once you have this, then remove the distributor cap and refer to the position of the rotor arm. It is pointing to number 1 plug lead (number 1 cylinder). You can start from that reference and hook up No.1 plug lead. Then, as your rotor arm turns clockwise, it should hit the following cylinders in this sequence: 1,8,4,3,6,5,7,2.


1,3,5,7 refers to the left bank and 2,4,6,8 refers to the right bank.

Oct 30, 2012 | Cars & Trucks

1 Answer

Need a spark plug firing order diagram for 1990 chevy s-10 blazer 4.3l


Firing order is 1-6-5-4-3-2. Cylinder numbers are, front to rear: left side (driver) 1,3,5, right side 2.4,6. Distributer numbers are: 1 in front side of cap. numbers run clockwise same as firing order from number one position.


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Aug 03, 2011 | Chevrolet Chevy Cars & Trucks

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I need the spark plug wiring diagram for a 1994 caprice classic 305


firing order of a small block chevy engine is 1-8-4-3-6-5-7-2, clockwise-#1 on the front driver side (1,3,5,7 on driver sied, 2,4,6,8 on passenger side)-#1 should be about the 7 o'clock position, but to be certain, rotate the crank (loclkwise) until the 0 degree mark on the balancer lines up with the scale-look at the installed rotor-it is either pointed at the 7 o'clock position or the o'clock position-with the plug in #1 removed, rotate it again to see if the cylinder pushes air (compression)-that is where #1 plug wire belongs. just plug them in in order (18436572)-you will still have to time it to start, they usually need to be set a few degrees before top dead center.

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1 Answer

How do you check the firing order on a chevy small block engine ?


Firing order for small block chevy is 1-8-4-3-6-5-7-2. The cylinders are numbered 1-3-5-7 on the driver's side of the engine counting front to back. Passenger side is 2-4-6-8, front to back. You will need to get #1 cylinder at top dead center on the compression stroke. To do this, remove the #1 spark plug and remove the coil wire from the distributor cap. You will need a helper for the next step. Place your index finger in the empty spark plug hole, Have your helper bump the starter with the ignition key, When #1 cylinder comes up on the compression stroke, the pressure will push your finger away from the spark plug hole. Don't worry, this doesn't hurt. Turn the key off. Check the timing mark on the harmonic balancer behind the crankshaft pulley. It should be pretty close to lining up with the "0" timing mark on the pointer attached to the engine block. Now pull the distributor cap and see where the rotor cap is pointing. This will be #1 on the distributor cap. The spark plug wire from the #1 plug will occupy that position. The next position on the distributor cap will be for the plug wire coming off the #8 cylinder. The rest of the plug wires will attach to the distributor cap in the above mentioned firing order counting clockwise. If you do not wish to place your finger in the #1 spark plug hole, you can use a piece of paper towel roll up and stuck in the hole just enough to form a seal. When the piston comes up on the compression stroke it will force the paper towel out. Any questions, just let me know.

Dec 30, 2010 | Chevrolet Chevy Cars & Trucks

2 Answers

Firing order for 1990 Chevy Caprice V8 305


look on intake front side it will tell you the firing order

Sep 18, 2010 | 1990 Chevrolet Caprice

3 Answers

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).

Jul 12, 2010 | Cars & Trucks

2 Answers

I took of*** my spark plug wires working on my small block 350 pickup and I don't remember the the firing order to put the new wires back on. Is there a diagram anywhere or is it even that difficult to...


Next time number each lead before you remove it and no. the dissy cap as well

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.
See the diagram; Click to open a printable larger image in a new window. The firing order starts with the number one cylinder. We would connect the number one spark plug wire to the distributor cap terminal in the 6:30 position. distributor.pngSince the next cylinder in the firing order is 8 (passenger side rear), we connect the number 8 spark plug wire to the next distributor cap terminal (approximately 7:30 position) in the clockwise direction from number one. You need to be sure you continue the firing order in the clockwise direction around the chevy small block distributor cap from the last installed spark plug wire. Setting the rest of the firing order is just a matter of repetition. Be sure to count the spark plugs from front to back on each side of the motor to identify the correct cylinder number in the firing order.

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1 Answer

I changed my dist. cap on 1990 chevy p/u took one


Is the coil connected to the ditributor? did you knock any connections off in the process? Does it turn over but not fire? do you have spark at the plugs? Are you sure of cylinder location in respect to firing order? Did you-and check this first as with any elec. problems-blow a fuse in the ignition circuit? good luck!

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3 Answers

1990 chevy 350 distributor wiring diagram and firing order


The firing order is 1-8-4-3-6-5-7-2.
The distributor rotates in a clockwise direction. The engine must be on the compression stroke on the #1 cylinder. Line up the timing marks. Remove the cap and the rotor should be pointing to approximately the 5 o'clock position.

Good Luck

Mar 06, 2009 | 1990 Chevrolet C1500

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