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Working on a 2014 Ford focus with a 2.0 L ST engine. We just…

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Working on a 2014 Ford...
Working on a 2014 Ford focus with a 2.0 L ST engine. We just replaced the engine with a Ford Motorcraft engine. Everything is running good but occasionally the check engine light will flash and we will get a cylinder number one in for misfire so we replaced the spark plug and coil pack with Motorcraft parts on cylinder number one and now we drive it for a couple more hours and we get a cylinder number one, three and number five misfire. I monitored cylinder number one while test driving it and I counted 168 misfires within about five minutes. This vehicle has an aftermarket exhaust with no oxygen sensor. But it also had the aftermarket exhaust and no oxygen sensor before we replaced the engine and didn’t experience this problem. Thoughts or suggestions?
Submitted: 3 months ago.Category: Honda
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Answered in 7 minutes by:
3/22/2018
Mechanic for Honda: Ron, ASE Certified Technician replied 3 months ago
Ron
Ron, ASE Certified Technician
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Mechanic for Honda: Ron, ASE Certified Technician replied 3 months ago

So it misfiring on #1 and #3, are there any fault codes setting?

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Customer reply replied 2 months ago
There were no fault codes the customer said he had the spark plugs or a gap and now they are working good. Those plugs were factory from Motorcraft so I’m a bit confused
Mechanic for Honda: Ron, ASE Certified Technician replied 2 months ago

So he had the spark plugs gapped and now there is a misfire on two cylinders?

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