Code P0300 P0301 P0304 2001 Camry 4cyl. need help please.

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Old 30 Sep 2006, 09:12 am   #1 (permalink)
Fred
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Default Code P0300 P0301 P0304 2001 Camry 4cyl. need help please.

My Sister's Camry 2001 4 Cyl. was running rough, and wanted me to look at
it. I told her I would start with replacing the spark plugs and fuel
filter, the filter has never been changed and the plugs looked worn. She
has 69,000 on the car. She never mentioned the engine light was on until
after I worked on it, but I never paid attention if the light when I was
working on it. I have a code reader, and it had 4 codes in the system.
P0300, P0301 (twice), and P0304. I can't believe changing plugs and fuel
filter would make the light go on. Does the 2 plugs share the same coil?
Did changing the fuel filter, plug up the fuel ejectors more? There was a
problem before, but maybe replacing some parts, made the part going bad
weaker? Thanks for any help.


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Old 30 Sep 2006, 10:02 pm   #2 (permalink)
johngdole@hotmail.com
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Default Re: Code P0300 P0301 P0304 2001 Camry 4cyl. need help please.

The proper filter/plugs change should not do anything negative. The
P0300 random/multiple misfires cylinder 1 (P0301) and 4. (P0304). Check
spark plug wires to make sure they are properly seated. Measure
resistance (25Kohm per foot) to make sure there aren't breaks in the
wires. Make sure routing is correct. One problem can affect both
because it's an out dated waste spark system (too bad), and #1 and #4
are on the same circuit loop.

You should also measure the coil resistance at the wire connector.
Check Haynes for the correct value. What plugs are you using?


Fred wrote:
> My Sister's Camry 2001 4 Cyl. was running rough, and wanted me to look at
> it. I told her I would start with replacing the spark plugs and fuel
> filter, the filter has never been changed and the plugs looked worn. She
> has 69,000 on the car. She never mentioned the engine light was on until
> after I worked on it, but I never paid attention if the light when I was
> working on it. I have a code reader, and it had 4 codes in the system.
> P0300, P0301 (twice), and P0304. I can't believe changing plugs and fuel
> filter would make the light go on. Does the 2 plugs share the same coil?
> Did changing the fuel filter, plug up the fuel ejectors more? There was a
> problem before, but maybe replacing some parts, made the part going bad
> weaker? Thanks for any help.


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