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Pulled those suckers out. Looks like they're pretty grimy. Sending them off to get cleaned. Not seeing any leaks around the injectors, though injector #2 came out in my hand without any effort oddly. Valve carbon buildup seems pretty bad on some. I might try to clean those while I have it all...

I guess a leaking injector lines up with the constant long-term negative fuel trip in the datalog? Thanks for this. I have the CS fuel injector removal tool coming. I'll take them out and get them cleaned. Seems SP63 is where everyone recommends?

I rechecked the pre-gapped plugs, all at 0.028. Did the compression test, motor warm. I ran the tests four times per cylinder, changing cylinder after each single test. I realized I didn't have the throttle fully open for these, but it does look like cylinder #1 is the outlier. Should I be...

I'm not sure where they got the motor honestly. I swapped out the coil packs with an OEM set and that didn't solve it. I've a compression tool coming in the next couple of days. Will post results and photos of the motor.

Year/Make/Model: 2011/Mazda/Mazdaspeed3 Mileage: 105k Location: Washington, US Concern: Rough cold start and P0300 DTC's: (please include descriptions): P0300 Modifications: Stock ECU/Tuning Software: None Tuner: None Is the concern intermittent? No Can you duplicate the concern? Yes...