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Engine cutting off when accelerating hard.

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Location
Aalborg
#1
Hello. New member here.

I have some problems with my stage 2 revo Ford Fiesta ST 2015. It has recently done alot of engine cut off when accelerating hard. It doenst happen all the time tho. There is no error codes or what so ever. I tried to convert to standard ford map, and it still did it. Some are saying that the ignition coil needs to be replaced. Can it be anything els? Anyone had same problem? Car has gone 50.000km.

Summary:
Engine cuts off. It loosing power for 1 sec but doesnt stall or anything.
No error codes showing.
Normally happens when engine is warm.

Thanks.
 


Messages
155
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Location
Broward county Fl
#2
Not sure on our cars but my turbo cars in the past would experience that when the spark plugs were old or gaped wrong.
I think its called spark blowout. cheap and easy to check.
 


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155
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83
Location
Broward county Fl
#4
A lot of us are using the NGK plugs, I have the 6510 plugs which are one step colder.
not sure if you can get them easily in Denmark but worth a look if you can.
 


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156
Location
WICHITA
#5
If you have an AP change one of your moniters to misfire count. That's how I found out mine was misfiring without setting any codes. I had access to a snap on scanner that actually told me which cylinders were misfiring. Mine was a spark plug issue.

Sent from my SM-G950U using Tapatalk
 


OP
T
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Aalborg
Thread Starter #6
A lot of us are using the NGK plugs, I have the 6510 plugs which are one step colder.
not sure if you can get them easily in Denmark but worth a look if you can.
Do they come pre gapped :)?
 


OP
T
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Aalborg
Thread Starter #7
If you have an AP change one of your moniters to misfire count. That's how I found out mine was misfiring without setting any codes. I had access to a snap on scanner that actually told me which cylinders were misfiring. Mine was a spark plug issue.

Sent from my SM-G950U using Tapatalk
I dont have a AP :(. But OBD tester says no error.
 


OP
T
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Location
Aalborg
Thread Starter #9
OP
T
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Aalborg
Thread Starter #11
mine never had misfire codes either. I was just able to see the misfire on the type of scanner I was using.

Sent from my SM-G950U using Tapatalk
Ah ok. Will replace the spark plugs first. I will report back if that fixed the problem :)
 


OP
T
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Aalborg
Thread Starter #12
**UPDATE**.

Changed the Spark plug to NGK 6510 and gapped them to 0.026". Everything works now and drives like a dream.
 


OP
T
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Location
Aalborg
Thread Starter #13
**SECOND UPDATE**

After running new plugs for 4 months, the "spark blowout" returns. Is the coil pack the next thing to replace? Again its not throwing any error codes..
 


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Location
WICHITA
#14
I went back to O.E Ford Motorcraft SP532 gapped at 0.026 in and haven't had a problem since. I kept fouling the One Step Colder because I don't drive more than 5 miles a day.

Sent from my SM-G950U using Tapatalk
 


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Location
WICHITA
#16
Yeah probably the same issue. I thought it was the cold weather but it was just because I went with the One Step Colder and they kept fouling out. I guess the amount I drive and stop and go had something to do with it. So I went back with the factory heat range and factory plugs.

Sent from my SM-G950U using Tapatalk
 


FiestaSTdude

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Location
Cary, NC
#17
If you have an AP change one of your moniters to misfire count. That's how I found out mine was misfiring without setting any codes. I had access to a snap on scanner that actually told me which cylinders were misfiring. Mine was a spark plug issue.

Sent from my SM-G950U using Tapatalk
How many misfires do you consider normal? At what point do you decide that there’s an issue? My car seems to have a lot, in a 10 minute drive the accessport counted 120 misfires
 




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