the cars runs but i have a mis-fire code P0300 - LS1LT1 Forum : LT1, LS1, Camaro, Firebird, Trans Am, Engine Tech Forums
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post #1 of 3 (permalink) Old 04-30-2015, 09:39 PM Thread Starter
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the cars runs but i have a mis-fire code P0300

the car runs but i have a code P0300 AND i have an overheating issue. i think i might have a bad thermostat, im going to look into that issue tomorrow.

as far as the P0300 i think im going to change the plugs tomorrow. when i was having all those no spark problems the car got flooded pretty bad. i changed the oil and there was probably several quarts of gasoline in the oil from the engine cranking with no spark as the injectors were still firing. i did not run or drive the car with that oil, i changed it when i re-installed the water pump.

i have replaced the opti (delphi), coil, and ignition module (was replaced today when i had interment starting and stalling with all proper voltages present.

the car starts and runs but i still have some issues. i think the plugs have to go, if there was that much gas in the oil then the plugs are probably screwed as well.

i was wondering if i could use NGK V-power plugs. they are fairly cheap with a discount i can get a set of 8 for $14, i am starting to run into a budget. are these at least an acceptable plug. if i dont go with those i will buy a set of delco cooper core plugs. how difficult are plugs to replace in 4th gens? i have heard the wires suck, but i dont imagine the plugs are that bad. i think the biggest pain with the wires would be on the opti side

i still have to buy two tires. im going with a pair for cooper zeon ZTP tires, i had them on my third gen and they always held the road well.
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post #2 of 3 (permalink) Old 05-01-2015, 06:24 AM
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Try misting the plug wires with water and running at night . You are looking for spark leakage.

A coil where the insulation has broken down can have spark jumping from secondary to primary, thus wasting part of the spark energy. This condition, however, would smoke a coil in short order.

Have you put your car on an obd 2 scanner with real time sensor data? You can get useful info from a running sensor scan. And sometimes be lucky enough to be pointed right to the offending component.
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post #3 of 3 (permalink) Old 05-01-2015, 10:46 AM Thread Starter
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im going to try plugs as i said the car flooded really bad, lots of gas in the oil. i do not have an OBD II scanner but if plugs dont fix the issue then i will have my GM guy over and he will bring his tech2 GM scanner. i fixed the overheating issue, that was simple. im a dumbass and the coupler fell off the water pump when i re-installed the water pump on the car. if i have to do wires then i will but i heard that they are a really big pain so im going to start with plugs.
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