Misfire or wtf!??! help - Mustang Evolution

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Old 02-06-2015, 02:37 PM   #1
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Misfire or wtf!??! help

My mustang started to shake/vibrate the check engine light flashed for 30 min then stayed on. the 1st mechanic ran diagnostic state it was a misfiring, he played the guessing game from spark plugs, to wires, to coil pack, to crank and finally fuel injector but to no avail. 2nd mechanic stated same problem a misfire on cylinder 5, replaced the fuel injector didn't work, then said something about a history code and my car worked perfectly for about a day and then started to shake and the good ol check engine light started to flash for about 30 min then it stayed on again. Of course im going to take it back to the mechanic but is there anything I could suggest to him that he is just not catching? if it helps any the issue seems to only start when I am in stop and go traffic, low RPM's or stopped and it is intermittent. You can hear a puttering when trying to gain speed and you can see my gauge struggling? Im not sure that is the the right word...
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Old 02-06-2015, 02:38 PM   #2
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What about the coil plugs and coil pack?

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Old 02-06-2015, 02:58 PM   #3
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yup both replaced.
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Old 02-06-2015, 03:02 PM   #4
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yup both replaced.
Are they oem units?

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Old 02-06-2015, 03:08 PM   #5
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please forgive my ignorance, are you asking if I purchased the replacement parts from the original manufacturer? I don't believe so, I was told which part #'s to buy at O'Reilly's that was it.
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Old 02-06-2015, 03:09 PM   #6
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please forgive my ignorance, are you asking if I purchased the replacement parts from the original manufacturer? I don't believe so, I was told which part #'s to buy at O'Reilly's that was it.
So they aren't aftermarket? Just plain ford parts?

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Old 02-06-2015, 06:43 PM   #7
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What happen to me the clip of the coil pack broke and kept coming out partially making it shake and misfire, check that make sure it's plugged in all the way.
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Old 02-07-2015, 02:49 PM   #8
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When the check engine actually starts flashing it's something serious that can overheat a cat-con. Reading the codes will give you an idea if it's ignition or fuel related, sometimes real specific. Try not to drive with it flashing any more than needed as not only will the cat overheat but raw gas could be washing down a cylinder & engine damage.
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Old 02-07-2015, 02:52 PM   #9
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When the check engine actually starts flashing it's something serious that can overheat a cat-con. Reading the codes will give you an idea if it's ignition or fuel related, sometimes real specific. Try not to drive with it flashing any more than needed as not only will the cat overheat but raw gas could be washing down a cylinder & engine damage.
I thought flashing cel was misfire specifically

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Old 02-07-2015, 02:56 PM   #10
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PS - if it's ignition related you should be able to provoke the misfire by moderately hard acceleration in high gear at low rpm. You'll notice immediate cut out & vibration.
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Old 02-07-2015, 02:59 PM   #11
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I thought flashing cel was misfire specifically

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You're right and the EPA only cares if it damages the emission system Valve sticking, bad spark or excess fuel = overheated cat.
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Old 02-07-2015, 03:06 PM   #12
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You're right and the EPA only cares if it damages the emission system Valve sticking, bad spark or excess fuel = overheated cat.
Hm good to know sir

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