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Mike V.
Mike V., Subaru Technician
Category: Subaru
Satisfied Customers: 23841
Experience:  Certified Subaru Technician, factory trained by Subaru.
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MISFIRE CODE AT 4000 RPM

Customer Question

MISFIRE CODE AT 4000 RPM
Submitted: 9 months ago.
Category: Subaru
Expert:  Dan replied 9 months ago.

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.

Customer: replied 9 months ago.
no it runs perfect no misfire or rpm limiter
Expert:  Dan replied 9 months ago.

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

Customer: replied 9 months ago.
Expert:  Dan replied 9 months ago.

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

Customer: replied 9 months ago.
it starts flashing at 4000. below it is out
Customer: replied 9 months ago.
cylinder 3and4 and yes it flahes
Expert:  Dan replied 9 months ago.

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

Customer: replied 9 months ago.
only 1 coil sohc yes we tried new coil wires
Expert:  Mike V. replied 9 months ago.

Hi there different expert here.

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

Customer: replied 9 months ago.
we have tried both 90000 kilom
Expert:  Mike V. replied 9 months ago.

Aftermarket or factory parts?

Customer: replied 9 months ago.
factory
Expert:  Mike V. replied 9 months 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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