Compression test- which fuses to pull?
01-04-2018, 03:41 PM
#1
Junior Member
Thread Starter
Compression test- which fuses to pull?
About two weeks ago the cel came on with the code p0308, cylinder 8 misfire. I swapped the cop with cylinder 4 and put in new spark plugs. Code came back on yesterday.
So, im gonna do a compression test but wanted to confirm which fuses to pull. I'm thinking #27 for fuel pump and #78 for ignition coil power. Are those the ones?
Anything else besides the spark plugs?
Thanks
So, im gonna do a compression test but wanted to confirm which fuses to pull. I'm thinking #27 for fuel pump and #78 for ignition coil power. Are those the ones?
Anything else besides the spark plugs?
Thanks
10-11-2018, 12:29 AM
#3
SoFlo5.0_4x4
Not sure about fuses. You should be able to unplug all the coils and fuel injectors individually right?
10-11-2018, 07:51 AM
#5
Senior Member
10-11-2018, 09:08 PM
#7
SoFlo5.0_4x4
Yea, I swapped a coil in after a misfire. You just pull the plug that connects into it. I think I disconnected the fuel injector plug too to check it if I recall correctly.
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10-11-2018, 09:12 PM
#8
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nemosdad (10-11-2018)
10-12-2018, 07:12 AM
#9
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Yeah, I can see why you would say that. That post should have read: “you cannot disconnect the coil plug from the wire harness.” Of course you can remove the plug from the coil and remove the coil. However I was attemting to relate that the exposed plug that has been removed from the coil is still connected to the harness and if you turn on the ignition the coil plug would be energized. Before attempting the compression test I pulled the ignition fuse to preclude having the coil plug being energized during the test. Sorry for that omission.
10-12-2018, 10:12 AM
#10
Senior Member
Once the coil is disconnected, the plug is a non-issue. The contact sockets are far enough up inside the connector that they can't touch anything even if face-on to a metal surface, and at a whopping 12vdc they aren't going to be throwing any sparks.