Question about 1998 Toyota Corolla
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
Code PO300 is a random missfire and may be hard to find. you could have a dirty fuel filter causing a slightly lean condition.I would change it. check for vacuum leaks by spraying carb spray around intake mainfold and listen for engine speed change. stay away from ignition wires. Throw a can of fuel injector cleaner in with your next fillup and put in supreme gasto clean fuel injectors. Also clean throttle body with throtte body cleaner and make sure hose fron throttle body to air flow meter (if it has one) is tight and is not cracked. Finaly disconnect battery for 30 seconds to reset code. Joe ASE Master Tech
Posted on Mar 04, 2009
What I have found is 9 out of 10 times it's a worn distributer gear.
Many try to say it's the fuel injection , but I have found it to be the distributer gear has worn out.
replace your distributer
Posted on Apr 19, 2009
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