Show me firing order from distributor cap

Assuming you know the basics of how an engine works the firing order is 1, 6, 5, 4, 3, 2.
Standing in front of the vehicle, facing the rear of the vehicle, the cylinder layout is this. Left side is the EVEN numbers and the right side is the ODD numbers. Number One is nearest to you on the right side. Number Two is nearest to you on the Left. Number 3 is the middle right, Number 4 is the middle left. 5 is back right and 6 is back left.
At the distributor the leads should be fitted in the firing order sequence moving in a CLOCKWISE direction. On some distributor caps the terminal for cylinder One is marked with a number on the top of the cap.
The cylinders Don't fire as pairs they fire in sequence alternating right to left.

All the diagrams I see for the 3.9 show the same. However, some show a 60 degree advance in orientation of the cap, i.e. the number 1 position is at number 2. Try moving the wires counter clockwise one position.

If you began with a non running engine, I suggest you manually bar over the crankshaft until cylinder 1 is at TDC of the compression stroke. Then remove the distributor cap. The rotor should be pointing directly at distributor tower number 1 position.

Firing order 1-3-7-2-6-5-4-8 --------- front ' 1 2 3 4 ' of ' 'distributorless ignition vehicle ' 5 6 7 8

Yes. Bring number 1 piston to top dead center of the compression stroke. Remove the distributor cap and see which post on the cap the rotor button is pointing to. This is where the number 1 plug wire goes. Follow your firing order on the cap in the same direction the distributor turns and your firing order will be right.

FIRING ORDERS NOTE: To avoid confusion, remove and tag the wires one at a time, for replacement. Fig. 1: 2.2L and 2.5L engines Firing order: 1-3-4-2 Distributor rotation: Clockwise
Fig. 2: 2.6L engines Firing order: 1-3-4-2 Distributor rotation: Clockwise
Fig. 3: 3.0L engines Firing order: 1-2-3-4-5-6 Distributor rotation: Counterclockwise
Fig. 4: 3.3L and 3.8L engines Firing order: 1-2-3-4-5-6 Distributorless Ignition System
Fig. 5: Distributor cap terminal routing (view from top of cap) - 3.0L engines

You didn't post your engine size so please use the appropriate diagram:




GM (Cadillac) 250 (4.1L) V8 .GM (Cadillac) 273 (4.5L) V8 .GM (Oldsmobile) 307 (5.0L) V8 .GM (Oldsmobile) 350 (5.7L) V8 w/EFI.Engine firing order: 1-8-4-3-6-5-7-2 .Distributor rotation: counterclockwise





GM (Buick) 252 (4.1L) V6 .Engine firing order: 1-6-5-4-3-2.Distributor rotation: clockwise





GM (Cadillac) 368, 425, 472, 500 V8.Engine firing order: 1-5-6-3-4-2-7-8.Distributor rotation: clockwise





GM (Cadillac) 429 V8.Engine firing order: 1-8-7-2-6-5-4-3.Distributor rotation: clockwise

The firing order is 1342. The cylinders are numbered from left to right 1234. Depending on wether it is a 16 valve engine, the distributor cap lead number one position is at the front on the left, if its a normal 8 valve engine , the distributor cap lead number one is at the front pointing straight at the front. So, moving anti clockwise, the next lead will be number 3, then 4 , then 2.

For all Dodge V8 truck engines, the firing order is 1-8-4-3-6-5-7-2. For all Dodge V6 truck engines, the firing order is 1-6-5-4-3-2. For Dodge inline 6 cylinder engines, the firing order is For all Dodge 4 cylinder engines, the firing order is 1-3-4-2 All dodge distributors rotate clockwise.


look at your distributor cap while standing on the driver's side of the vehicle.
Start at number 1, which is labelled on the cap, and go
clockwise

Good Luck

Firing order is 1-8-4-3-6-5-7-2 Cylinder numbers looking at engine from front Left Bank 1-3-5-7 Right bank 2-4-6-8 Distributor has clockwide rotation,