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It has missfire code po300, po304 and po305. I have not

Customer Question
It has missfire code...

It has missfire code po300, po304 and po305

Mechanic's Assistant: Just to clarify, what's the exact code? And have you tried to reset it?

I have not reset it

Mechanic's Assistant: What is the model/year of your Toyota?

2002 avalon

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

I plan to fix it

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

This is the engine i put it in about 10,000 miles ago. it has 156,000 miles on it when i bought it

Submitted: 9 months ago.Category: Toyota
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Answered in 1 minute by:
11/13/2017
Toyota Mechanic: Mike, Auto Mechanic replied 9 months ago
Mike
Mike, Auto Mechanic
Category: Toyota
Satisfied Customers: 515
Experience: Lead Tech at Solis Auto Repair
Verified

Hello, my name is***** will be helping you out! I have over thirteen year of experience in the automotive industry for numerous different makes & models. I enjoy doing what I do, it is my life.

I am going over your case now, are you trying to know what the possibilities are?

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Customer reply replied 9 months ago
no talk. i am fixing the car now
Customer reply replied 9 months ago
are you still there?
Toyota Mechanic: Mike, Auto Mechanic replied 9 months ago

Yes im going over your case now :)

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Customer reply replied 9 months ago
ok
Toyota Mechanic: Mike, Auto Mechanic replied 9 months ago

The possibilites are as follow

ignition coil

spark plug

air leak

oil in the cylinders

headgasket.

The first step you should do is located cylinder 4 and 5 and swap the coils to another known good cylinder and see if the misfire changes to that cylinder, if it does then you know coils are bad.

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Toyota Mechanic: Mike, Auto Mechanic replied 9 months ago

Have you attempting swapping the coils yet?

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Toyota Mechanic: Mike, Auto Mechanic replied 9 months ago

If you have time, please take a moment to leave me a rating so I can receive credit for the question, it will mean so much to me :). We can still continue the question if you have more questions after rating me :). It was my pleasure.

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