Question about 1997 Toyota Camry

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P0306 misfire Toyota Camry 1997. 180k miles. V6 Engine. Engine shaking with check engine light flashing. Switched the Coils to check if coils needs to be replaced for 4th and 6th. Threw the codes. P0306 is still showing up. Is it the plugs? What other problems could the car be having if its not the plugs?

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A fuel injector. I would replace the plug first tho.

Posted on Jul 21, 2013

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Switching coils is not the way to resolve that issue
At home,no experience,no test equipment, all you
can do is walk a new coil, one cylinder at a time &
drive at least 20 miles in hot weather if possible
You don't have the ability to check fuel trim or an
easy way to check for vacuum leaks.
You also can't check cylinder contribution for
mechanical problems,that should happen first
Walk a new coil,putting back the old one as you go
The codes are not always correct or you get many
that make no sense.
If one coil is bad & 7 years old the others are not
far from acting up also
Those coils do many different acts on different engines
No PO300 will tell you if you have a bad coil or what one
I have seen professional scan tool software not work,
& your back to the coil walking

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