Problems finding the correct firing order in '95 F-150 V-8

2008 Impala 3.9 engine firing order

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Jul 10, 2015 - Need help finding the firing order for a 2008 impala 3.9 engine. Most sites/autozone have all the firing orders except for the 3.9 of course ...
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The main thing is to read that check engine light code. That will give you the answer, but maybe incorrect firing order is causing it?

https://www.google.com/search?q=mobile+auto+electrician+near+me

So check on the firing order FIRST. When changing the distributor cap, you should do one wire at a time off the old one. Same for replacing spark plugs, do one at a time. Having one lead in the wrong place is a sure fire way to get real real rough running.

https://www.google.com/search?q=1994+mercury+topaz+4+cylinder+firing+order

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Are plug wires connected in the right firing order to the plugs? Also are the spark plugs gap correct? Was vehicle running rough before tune up or only after?

123456 is the firing order replace spark plugs and fuel filter those can all cause rough and misfiring problems also replace air filter

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

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: 1987-91 2.5L engine Engine Firing Order: 1-3-4-2 Distributor Rotation: Clockwise
Fig. 2: 1992-95 2.5L engine Engine Firing Order: 1-3-4-2 Distributor Rotation: Clockwise
Fig. 3: 4.0L and 4.2L engine Engine Firing Order: 1-5-3-6-2-4 Distributor Rotation: Clockwise

Check the firing order with the firing order diagram that I have uploaded, and if that does not solve the problem then remove the spark plugs and be certain that there is an even spark plug gap between all of the spark plugs, (see the emission label under the hood for the correct spark plug gap) and be certain that there is not any split-fire or multi-fire spark plugs installed in the engine, because those plugs will not work with an OBD-II system, and a random mis-fire is the least that they will cause if installed in an OBD-II controlled vehicle.

If the wires are in the correct order, also make sure that you used the correct starting point, otherwise the base timing can be off by as much as 60 degrees. Turn the engine till the crank damper timing mark is pointing to 0 or tdc on the timing scale. If the rotor is pointing towards the engine, turn one more time. #1 is roughly when the rotor is pointing towards the passenger headlamp. Order is in the direction the rotor turns when cranking. If the engine was running with no problems before the change, only other thing could be that you inadvertently unplugged something or the security system armed. Other possibility is that if you did the change due to a running problem, whatever was causing that finally failed.
If when you remove the cap again you find that the rotor is damaged, check the dist shaft for side play.
Are you getting spark?

Make sure the ignition wires are on the right cylinder.

Because you didn't say which engine this link will take you to a proper site that has what you need