misfire,
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misfire,
Hey I am new to this, I have a 2005 f150 4x4 with a 5.4 it was studdering on the highway under light load, i changed the plugs and coils it worked great for a day now working worse and giving a misfire #7, so i swapped the injectors around still misfire #7. any ideas????
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Joined: Mar 2004
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From: Sunapee NH
Before pulling the plug, verify that your connector on cylinder #7 is properly seated. I've had trouble with the connectors not completely seating.
Could be the plug or COP is bad. But it could also be too much anti-seize was applied.
Hope it's an easy fix.
Could be the plug or COP is bad. But it could also be too much anti-seize was applied.
Hope it's an easy fix.
Elder User
Joined: Nov 2001
Posts: 892
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From: Duluth, MN
Usually fuel pressure issues will show up on bank 1, being as it's the last side to get pressure. Disconnect both the injector harness and the cop harness, and connect a noid light to the harnesses and make sure it flashes with the engine running. A test light can be used for this, but keep run time as short as possible. If you the light pulses on both circuits, it's possible you have a bad injector or compression problem.
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tested coil and injector with <led> test light all good, what should i have for compression? didn't have a misfire #7 until i changed the plugs, but i swapped plugs from cyl to cyl and coils --still #7 misfire
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Posting Guru
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From: northern va
holy s**t!! that sucks but make shure nothing failed in the valve train to hold a valve open a small amount.
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