So recently I started having an issue with my H22A. Under light throttle or when the car is cold, the engine will misfire. An example would be when you get back on the throttle after shifting gears (light throttle, light load) I'll experience the misfire for a second or so then it smooth's back out, similar to the sound of a car with a DSG transmission. Under heavy acceleration I can experience a backfire amongst the misfires. None of this seems to be consistent with rpm or engine temp.
Thinking I had a compression issue, I performed a check. All cylinders are aprx. within the 10% spec of each other with the highest being 205psi and the lowest around 187psi. I went ahead and installed new plugs, same brand and type as what was in the car before the issue began. My plug wires were on the old side, about a decade old or more, so I grabbed a new set of NGK wires. The issue still exists. My AFR is well within what I'm used to seeing when the issue occurs so I'm leaning away from it being a dirty injector, as I've experienced, diagnosed, and repaired that issue in the past.
After talking with a few friends and coworkers, I'm leaning towards my internal coil starting to go bad, though I haven't gotten any hard diag info from anyone. I also don't know how common an internal coil failure is and whether or not it would be a good idea to swap to an external coil setup. I'm still running the stock single cam engine harness so the change over wouldn't be that difficult. I am currently running the stock P13 ECM.
Thinking I had a compression issue, I performed a check. All cylinders are aprx. within the 10% spec of each other with the highest being 205psi and the lowest around 187psi. I went ahead and installed new plugs, same brand and type as what was in the car before the issue began. My plug wires were on the old side, about a decade old or more, so I grabbed a new set of NGK wires. The issue still exists. My AFR is well within what I'm used to seeing when the issue occurs so I'm leaning away from it being a dirty injector, as I've experienced, diagnosed, and repaired that issue in the past.
After talking with a few friends and coworkers, I'm leaning towards my internal coil starting to go bad, though I haven't gotten any hard diag info from anyone. I also don't know how common an internal coil failure is and whether or not it would be a good idea to swap to an external coil setup. I'm still running the stock single cam engine harness so the change over wouldn't be that difficult. I am currently running the stock P13 ECM.
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