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P0304, p0303, car runs fine all the time with no codes....

Customer Question
P0304, p0303, car runs...

P0304, p0303, car runs fine all the time with no codes.... when you start it once out of every 15 starts or so it seams to only run on two cylinders until shut off and restarted when it runs fine again.

Mechanic's Assistant: Will the headlights turn on? Is the battery fully charged?

The head lights are on... engine turns over easily when started

Mechanic's Assistant: What is the model of your '15 Subaru?

It's a 2008 Impreza 2.5 sohc

Mechanic's Assistant: Are you fixing your Impreza yourself? What have you tried so far?

All I've done is start and stop the engine a number of times to replicate the malfunction

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

When it starts and is malfunctioning I can smell unburdened gas and it appears to run continuously with two cylinders completely without combustion

Submitted: 11 months ago.Category: Subaru
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Answered in 1 hour by:
9/21/2017
Subaru Mechanic: tamaz, Subaru master technician replied 11 months ago
tamaz
tamaz, Subaru master technician
Category: Subaru
Satisfied Customers: 1,427
Experience: Subaru certified,ASE Master technician,25 years experience
Verified

Hi,because they are opposing cylinders I would try a new coil pack,this misfire will eventually harm the converters if it hasn't already.You may want to spray the coil pack down with some water if spark is arcing from the coil pack you will see it and engine will run poorly.

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Customer reply replied 10 months ago
Its arcing...replacing cool, thanks
Subaru Mechanic: tamaz, Subaru master technician replied 10 months ago

Your welcome!

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tamaz, Subaru master technician
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