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The #1 cylinder will be on the front driver side (left side as looking at it from the driver seat). On the same side of the engine will be #3, #5, and #7 cylinders.
The right side will be (starting from the front) will be #2, #4, #6, and #8 cylinders.
For the 1988 GMC K2500: I do not know if you have the 4.3L V6 or the 5.0L, 5.7L or 7.4L V8's however I have included all below: For the 4.6L V6: Firing Order: 1-6-5-4-3-2 Cylinders: ......(back)........ '...6...........5...' '...4...........3...' '...2...........1...'
.......(front) Distributor:
......(back) (+) - screw
..........4
....................3 5
.....................2
....6
.............1
.....................(+) - screw
For ALL V*'s (5.0L, 5.7L and 7.4L) Firing Order: 1-8-4-3-6-5-7-2 Cylinders: .......(back)........ '..8..............7..' '..6..............5..' '..4..............3..' '..2..............1..' ........(front) Distributor Connections: .....(back) .....6.....5 3...............7 4...............2 .....8.....1 .....(front) Rotation: Clockwise
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 2.4.6.8) (back 1.3.5.7)
(distributorless ignition)
It is also a good thing to try and compare the thread lenghts of the old spark-plugs being replaced with the new.
the firing oder is 1-8-4-3-6-5-7-2 at 4 degrees before top dead center\turn the crankshaft pulley to 4degrees, then the rotor should be pointing at the no.1 cylinder,
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