Question about 1998 Chevrolet K1500

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Code P0430 Truck has a bad pinging upon acceleration. Originnaly gave me a 0300 code. Changed plugs wires and fuel filter. Still has a bad pinging and loss of power. at 111,000 miles am going to try flushing the injectors, Praying it's not the Cat Convertor Any ideas???

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0430 is cat system efficiency below threshold bank 2 which means that the o2 sensor down stream of the cat converter is reading that the cat is not working properly solutions are bad cat--- bad o2 sensor [one after cat] or --an exhaust leak

Posted on May 06, 2010

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P0300: random multiple cylinder misfire detected.
p0430: catalyst efficiency below threshold bank 2

This can be a hunt and seek game here... the EGR valves on these can create havoc on the v/8 try removing it and checking it for being stuck open/clogged with carbon etc. be sure you have a new gasket when removing it, its critical to engine idle/performance.
Try taking it to an Auto Zone Parts Store and let them run the scanner on iot for free they will give you a print out and advise if that helps and its all free.

Posted on May 06, 2010

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Most likely I a would suspect the fuel rail had moisture in it. If you checked emissions it would most likely show no HC and alot of 02 and no CO. If it does show alot of HC then I would suspect sticking valves intermittantly . The pinging really points to no fuel issue tho. If you pull the injector connector off and no change then I would remove the fuel rail and inspect. Also make sure the wires are in the correct locations. It easy to get them wrong.

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Jerking on normal acceleration.


You might try a TPS switch. It should set a code but yours did't. The throttle position sensor sets the spark advance and fuel flow to match. The other possibility is the EGR system which also should set a code.
If you have not changed the fuel filter,try that because if you accellerate hard the fuel slooshes to the back of the tank.
In normal driving the contaminents lay on the bottom of the tank.

Aug 12, 2009 | 1992 Mercury Grand Marquis

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Check engine light is on the code was po300 cylinder misfire detected probable causes are vacuum leak injector fault high or low fuel pressure or ignition system fault spark plugs,ignition wires, or coil


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.

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