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MISFIRE CODE AT 4000 RPM

Customer Question
MISFIRE CODE AT 4000 RPM
Submitted: 2 years ago.Category: Subaru
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Answered in 1 minute by:
2/16/2016
Subaru Mechanic: Dan, Technician replied 2 years ago
Dan
Dan, Technician
Category: Subaru
Satisfied Customers: 26,070
Experience: Independent Shop Experience, 2 Year Automotive Diploma, & Access to Information Database
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Hello, my name is***** it run fine under 4000 rpm? Does it act like it has a rpm limiter and not want to go above 4000? Thanks.

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Customer reply replied 2 years ago
no it runs perfect no misfire or rpm limiter
Subaru Mechanic: Dan, Technician replied 2 years ago

Does the check engine light start flashing above 4000 rpm? Is your check engine light coming on at all? Thanks.

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Subaru Mechanic: Dan, Technician replied 2 years ago

Are you getting a specific cylinder misfire or random cylinder misfire? Does the check engine light flash?

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Customer reply replied 2 years ago
it starts flashing at 4000. below it is out
Customer reply replied 2 years ago
cylinder 3and4 and yes it flahes
Subaru Mechanic: Dan, Technician replied 2 years ago

Have you tried swapping around the coils to see if misfire follows coils?

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Customer reply replied 2 years ago
only 1 coil sohc yes we tried new coil wires
Subaru Mechanic: Mike V., Subaru Technician replied 2 years ago
Mike V.
Mike V., Subaru Technician
Category: Subaru
Satisfied Customers: 27,801
Experience: Certified Subaru Technician, factory trained by Subaru.
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Hi there different expert here.

You tried a new coil and coil wires or just the wires?
Also, how many miles on the car?

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Customer reply replied 2 years ago
we have tried both 90000 kilom
Subaru Mechanic: Mike V., Subaru Technician replied 2 years ago

Aftermarket or factory parts?

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Customer reply replied 2 years ago
factory
Subaru Mechanic: Mike V., Subaru Technician replied 2 years ago

Ok,

I would inspect the wiring harness to the ecm from the coil, and also take a look at all the ground wires around the engine compartment. I have seen the grounds cause some major issues on these cars. Inside the engine there were some issues with the valve guides dropping or shifting when the engine was running, but I believe this wasn't an issue on the newer models.

It would also seem unlikely that it happens to be the 2 across from each other. usually the flashing check engine light does mean an ignition failure but not always. You may want to disconnect and reconnect the ecm harness as well.

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