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Discussion Starter · #1 ·
2012 ford fusion SE 2.5L with 105k miles. It was idling rough, vibrating at stops, poor acceleration and misfires. I gave it a tune up, with spark plugs, ignition coils, serpentine belt/tensioner, oil/filter change, removed, cleaned, recalibrated the throttle body, removed and cleaned the fuel injectors. Now I only have misfires when the AC is on. The AC seems to run good. No noises. No codes.
 

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Discussion Starter · #3 ·
I disconnected the negative cable. I jumped the positive(still on the post) to the negative battery cable for 5 to 10 minutes.
Turned the car on and let it idle/relearn PCM for 10 minutes. Is this the same as you are mentioning?
 

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Discussion Starter · #4 ·
I disconnected the negative cable. I jumped the positive(still on the post) to the negative battery cable for 5 to 10 minutes.
Turned the car on and let it idle/relearn PCM for 10 minutes. Is this the same as you are mentioning?
I did this PCM procedure again, except this time, after letting it idle for 10 minutes, I turned the AC on and let it cycle for a few minutes in PARK. I then put it in drive with emergency brake on and let it idle for another 2-3 minutes. I then drove it for twenty minutes and it seemed better, but not 100%. So close, but still misfires with the AC on.
 

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2012 SEL 2.5
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You don't "jump" any cables. You take "both" cables off the battery. Then you touch the ends together for a good 5 minutes. Then you put the positive on first, then the negative. Then let in run for 5 minutes. Try the a/c
 

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Discussion Starter · #6 ·
You don't "jump" any cables. You take "both" cables off the battery. Then you touch the ends together for a good 5 minutes. Then you put the positive on first, then the negative. Then let in run for 5 minutes. Try the a/c
Okay. This is the procedure I saw on Youtube from a Ford mechanic. I'll try your procedure tomorrow morning and let you know. Thanks.
 

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Discussion Starter · #7 ·
Jumper wire:) Jumper wire from positive to negative is same as touching ends together. Except you are removing the positive from the post. I hope it works.
 

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Discussion Starter · #8 ·
Still the same. Seems to be better in the morning when it's only 80 degrees. When I get out of work, it's 105 degrees and it seems to misfire more.
 
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