Slight misfire? - Taurus Car Club of America : Ford Taurus Forum
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post #1 of 3 (permalink) Old 07-05-2019, 08:25 PM Thread Starter
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Slight misfire?

I have a 2018 SHO Performance Pack that I bought brand new. The car at idle, and while driving has a slight fluctuation in the idle. I can feel it and see it on the gauge cluster. I took it to the dealer. They can’t find anything wrong with it. They told me the car needs to break in. Well, 10,000 miles later, it still has this fluctuation. I’m unsure what it can be. No engine light or codes stored. I tuned the car, I changed the plugs fromSP534 to SP542, it has an AirRaid CAI I always run premium fuel.

2010 Taurus SHO Atlantis Green NON PP
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post #2 of 3 (permalink) Old 07-09-2019, 10:54 AM
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Maybe a real good quality scanner can find the cylinder(s) that's misfiring? They make electronic tools to diagnose hard to find random misfires. One of those tools can detect if its an electrical misfire or one due to an injector that's not working properly.
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post #3 of 3 (permalink) Old 07-09-2019, 12:03 PM
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Try switching back to the stock air intake system (which, BTW, is also a CAI) and see if the issue goes away.

You can watch missfires accumulate in each cylinder with Forscan.

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