Cylinder 3 misfire - FMVperformance.com : The site for all your Ford Mazda and Volvo needs
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post #1 of 4 (permalink) Old 04-07-2019, 05:10 PM Thread Starter
Bicycle Rider
 
Join Date: Apr 2019
Posts: 2
Cylinder 3 misfire

I have 2010 Ford Fusion 2.5 i replaced the coils spark plugs and cylinder 3 injector and I still have a bad missfire I think from cylinder 3 when u unplug it it runs the same but if u unplug 1,2, or 4 it starts to die out. Anybody got any ideas?
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post #2 of 4 (permalink) Old 04-07-2019, 07:46 PM
Short Track Racer
 
Join Date: Jun 2015
Posts: 211
What codes have been set, and have you tested for spark (or have you done any other diagnostic testing)?

2011 3i 2.0 A/T 130K miles (daughter's ride which I maintain)
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post #3 of 4 (permalink) Old 04-08-2019, 12:22 AM Thread Starter
Bicycle Rider
 
Join Date: Apr 2019
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I took it to autozone to get it scanned and all I got outta them was cylinder 3 and 4 missfire but 4 seems like everything is fine 3 is having problems Iím getting spark outta of it. Would a clogged cat cause this problem i wouldnít think since itís only running on 3? But just a idea. The car sounds like itís cammed when u get close to the exhaust
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post #4 of 4 (permalink) Old 04-08-2019, 08:45 AM
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You need to diagnose the problem, and I recommend a compression test first. Other testing to try is removing the upstream O2 sensor and run for a brief period of time, and also a fuel pressure test.
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2011 3i 2.0 A/T 130K miles (daughter's ride which I maintain)
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