My 1999 Dodge Durango is not firing properly. We have changed to plugs and wires but think we may have some of the wiring wrong. We can read the cylinder numbers on the block so we are not sure which are which. I have looked through my manual but can not locate this information. Please advise me on the cylinder numbers for this magnum v8 5.9L engine by dodge.
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Had a similar problem years ago. Since everything is electronic very hard to do self diagnostic. Make sure the boot is completely into the "Rotor" cap. Are these original wires? Not sure if some still use graphite or all copper these days. Worst case is carbon build up on # 8 piston. compression test is 1st thing. Was plug anode clean or pitted? May not be a whole bunch of help but ck these things out 1st. Best advise is think simple before you freak out.
Firing OrdersNOTE: 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 and installed improperly and then rewired. The new wiring arrangement would maintain 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 of the current plug wire locations and orientation of the distributor cap. 3.9L Engine
The firing order is a sequence of ignition time when the engine cylinders deliver their power-strokes starting with the number-one cylinder. If this sequence is faulty or arranged disorderly, the engine may not start at all, and if it does start, it may does so hesitatingly, or not run enough well to enable it to drive-or simply lacks the power to move. A waste of gas, and unecessary tear and wear on the engine and its critical components ultimately result. Once the firing oder is correc and in proper sequence, the engine should starts easily and promtly, running as quietly as posiible.
For Dodge 2004 Durango firing-order:
All 6-cylinder K 3.7L MFI SOHC distributorless ignition:
1-6-5-4-3-2 (front 2-4-6) (back 1-3-5)
All 8-cylinder N 4.7L SFI (including HEMI 4-WD)
1-8-4-3-6-5-7-2 (front 188.8.131.52) (back 184.108.40.206)
It is also a good thing to try and compare the thread lenghts of the old spark-plugs being replaced with the new.