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P0304 diagnosis camry 02

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New User

Feb 7, 2020, 9:33 PM

Post #1 of 2 (1603 views)
P0304 diagnosis camry 02 Sign In

I have a Toyota Camry 02, 4 cyl LE that has a P0304 code. I have done the following:
Replace gas cap
Switch coil and spark plug from 4th cyl but the code stayed at the said cyl
I have also done a gas system clean with Techron conc fuel plus clean

The code at first was a solid engine light. Now it’s a blinking light meaning the misfire is greater than 10% and is noticeable while driving. What would be the next things to check and at what point would you say it’s worth taking to the shop. I am a diyer so limited tools and instruments. Please advice! Gracias!

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Feb 8, 2020, 2:03 PM

Post #2 of 2 (1600 views)
Re: P0304 diagnosis camry 02 Sign In

The first thing you have to do is determine whether it's a spark problem, a fuel problem or a compression problem.

You can use a spark tester to determine if the spark is strong enough.


We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

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