On a Ford F-150 ( V8 engine ) the engine cylinders are numbered :
firewall
4 - 8
3 - 7
2 - 6
1 - 5
front of vehicle
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On a Ford F-150 ( V6 engine ) the engine cylinders are numbered :
firewall
3 - 6
2 - 5
1 - 4
front of vehicle
You can determine which is number one cylinder by tracing the number one wire back to the cap. The number one plug is the first one in the front on a four cylinder and on a V6 it is the first plug on the drivers side.
its a misfire on cylinder number 1, check your spark plug, plug wire and/or coil on cylinder number 1
What coil goes to what cylinder
If you look at the distributor of the car, sometimes they are marked with the cylinder number on the cap. Find number 1 and follow the spark plug cable to the spark plug. That will be No. 1 cylinder.
1) Have vehicle scanned to determine which cylinder is misfiring 2) Does vehicle have C.O.P. (coil on plug)? usually a bad ignition coil on that cylinder 3) Remove spark plug from that cylinder and do a compression test to determine if problem is internal to the engine (bad valve or ring).
I can't tell from here. Check the spark plug in the #5 cylinder, and the ignition wire to the plug.
Number one spark plug is closest to the radiator.
open the hood and the number one cylinder will be werethe first spark plug on the right , or the driver's side.
Change the wire, or coil plug
on the drivers side the plug closest to the radiator is the #1 plug.
plug your answer it to the original question
It can be the spark plug or the plug wire. In some cases it could be a vacuum leak.