What is the firing order for 3.4 V6 engine and need diagram of how the wires go.

https://workshop-manuals.com/chevrolet/el_camino/v6-229_3.8l/maintenance/tune-up_and_engine_performance_checks/firing_order/component_information/specifications/ignition_firing_order/

my guess, is you removed them and didnt mark them?
the firing order?
what engine, there are 5.

to do this , one need to know 5 things.
2.5L, 2.8L, 4.0L and 5.2/5.9L engine displacements.
the distributor rotation direction CCW, or CW
and last the firing order, sometimes marked clearly on the intake manifold.
you must now where #1 cylinder is (always most front)
1989-98 2.5L Engine firing order: 1-3-4-2 Distributor rotation: Clockwise
2.8L Engine firing order: 1-2-3-4-5-6 Distributor rotation: Clockwise
4.0L Engine firing order: 1-5-3-6-2-4 Distributor rotation: Clockwise
5.2L and 5.9L Engine firing order: 1-8-4-3-6-5-7-2 Distributor rotation: Clockwise
on a v6/v8 one cylinder is more forward. this is #1, look carefully.

3.9L V6 engine firing order is 1-6-5-4-3-2, cylinders on the pass side front to back are 2-4-6, cylinders on the driver side front to back are 1-3-5.

You didn't state what year or engine size, this image is for 1980 to 1996 nissan, but it should help.



4 cyl. firing order is 1-3-4-2
V6 firing order is 1-2-3-4-5-6

See Figures 1, 2, 3 and 4
To avoid confusion, remove and tag the spark plug wires one at a time, for replacement.
If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes, to reflect how your engine is wired.

Fig. Fig. 1: 2.5L Engine - Engine firing order: 1-3-4-2- Distributor Rotation: Clockwise

Fig. Fig. 2: 2.8L Engine - Engine firing order: 1-2-3-4-5- Distributor Rotation: Clockwise

Fig. Fig. 3: 3.1L Engine - Engine firing order: 1-2-3-4-5-6- Distributor Rotation: Clockwise

Fig. Fig. 4: 5.0L and 5.7L (VIN 8) Engines - Engine firing order: 1-8-4-3-6-5-7-2- Distributor Rotation: Clockwise
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1985 Oldsmobile Cutlass Salon 3.8 liter V-6



Hope this helps.

For the 4.0L V6:
Firing Order:
1-4-2-5-3-6
Cylinders:
........(back)........
|...3...|.......|...6...|
|...2...|.......|...5...|
|...1...|.......|...4...|
.........(front)
Ignition Coil Connections:
..(back)
1...2...3
5...6...4

FIRING ORDERS NOTE: To avoid confusion, remove and tag the spark plug wires one at a time, for replacement. If a distributor is not keyed for installation with only one orientation, it could have been removed previously and rewired. The resultant wiring would hold the correct firing order, but could change the relative placement of the plug towers in relation to the engine. For this reason it is imperative that you label all wires before disconnecting any of them. Also, before removal, compare the current wiring with the accompanying illustrations. If the current wiring does not match, make notes in your book to reflect how your engine is wired. Fig. 1: 300 cid (4.9L) inline six-cylinder engines Firing order: 1-5-3-6-2-4 Distributor rotation: Clockwise
Fig. 2: 232 cid (3.8L) V6 engine Firing order: 1-4-2-5-3-6 Distributor rotation: Counterclockwise
Fig. 3: 255 cid (4.2L), 302 cid (5.0L), 360 cid (5.9L), 390 cid (6.5L), 460 cid (7.5L) V8 engines Firing order: 1-5-4-2-6-3-7-8 Distributor rotation: Counterclockwise
Fig. 4: 351 cid W & M (5.8L), 400 (6.6L) engines Firing order: 1-3-7-2-6-5-4-8 Distributor rotation: Counterclockwise
Fig. 5: 6.9L diesel engines Firing order: 1-2-7-3-4-5-6-8

3.9L V6 Engine. Engine Firing Order: 1-6-5-4-3-2. Distributor Rotation: Clockwise.............did i guess the right motor? let me know/rate me

1991-1994 2.9L and 3.0L Engines Firing Order 1-4-2-5-3-6 1995 And Later 3.0L V-6 With DIS Ignition System Firing Order 1-4-2-5-3-6
4.0L Engines Firing Order: 1-4-2-5-3-6 DIS Ignition System