I’ve got a JDM 2002 Honda Fit in New Zealand. The car runs perfectly when it is cold, but shortly after the cold engine light goes out, the engine starts misbehaving… sputtering, etc. under load when I try to accelerate.
I recently replaced all 8 coil packs a few months back to fix a previous engine misfire (and just recently replaced all spark plugs). Now, it seems I’m having issues while accelerating. The engine seems to be down on power until about 50km/h or so and then you can feel the car take off (at least relative to what that little engine can do…). Along the way you can feel periods of a slight shudder, or grinding? or rough running when accelerating from a stop, then again from around 20-30km/h, then again around 40-45km/h or something along those lines. The roughness kind of comes and goes as you accelerate, though it is always lacking power until it seems to “break free” somewhere between 50 and 60km/h.
Shortly after the coil packs were replaced, I noticed this slight shudder for a second or two when accelerating from a stop, but it was very slight and only from when stopped. Now it seems to have gotten significantly worse all of a sudden (as described above).
Probably unrelated, I had to jumpstart the car a couple weeks ago. It had been running fine after that until now. I have already done the ECU/PCM reset procedure and it didn’t seem to make a difference.
I’ve tried to clean out the EGR valve as best I could, and that doesn’t seem to have made a difference.
I’ve got a couple theories, but am keen to hear what everyone here thinks. Thanks in advance for your help!