Question about 1998 Toyota 4Runner
98 4runner with 130k....For over two years my check engine light comes on and goes off. It comes on for a day, then goes off for a day in no specific order. I've changed one coil pack, plugs and plug wires and light still comes on. Before changing plug wires, i was getting codes p300 and p301, but now its just code p300..The spark plug in one cylinder was red in color, which most likely had something to do with the p301 code. What else could it be besides the injectors? No vacuum leaks and compression is good. Is there a sensor that will make it run rough and throw that code?
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Posted on Jan 02, 2017
I respectfully disagree.
A P-0300 will NOT be set in a Corolla by a dirty fuel filter.
Replacing the fuel filter could be a very costly operation, as I have observed that the fuel line threads that connect to the fuel filter easuily get damaged when removing the fuel filter.
In short, don't replace the filter until you are SURE that it is the culpit.
In this case, the fuel filter is NOT the culprit..
Save your money; and your time.
Additionally, premium fuel does not clean fuel injectors. That expense would be a waste of money. The engine will actually run WORSE on premium fuel; the engine is NOT designed to run on premium. 87 or 89 (better choice/89) is the grade to use.
If you really want to track down the P-0300 code, which is a multiple/random cylinder misfire, I would look at the quality of the fuel in the car; ie water in the gas. Second, I would remove the plugs and examine them closely. A worn center electrode will also set the P-0300 code, as will bad/weak plug wires (over 5 years old).
Please feel free to contact me back if you need further assistance. Thanks for choosing FixYa for assistance.
Posted on Mar 05, 2009
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