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  1. Studder under load, P0301 Code

    Providing an update, the injector for cylinder 1 is bad. Replaced with CorkSport injectors and seals and the car is running good now.

  2. Studder under load, P0301 Code

    thanks, I’ll do that this weekend. also, I ran a compression test and got consistent results back across all 4 cylinders. ~138psi dry and ~150psi wet for all 4. There was maybe a 2psi variance.

  3. Studder under load, P0301 Code

    great suggestion. Most of the wire is covered by shielding. Anything specific I should be looking for? In image, left is coil pack for cylinder 1, right is coil pack for cylinder 2.

  4. Studder under load, P0301 Code

    yes, all gapped to .027 or .028

  5. Studder under load, P0301 Code

    Thanks for the reply. I'll check gap, they are NGK plugs. What should the gap be? Also, a quick update, a swapped coil packs on cylinder 1 and 4, and I am still getting a P0301 code after a few days of easy driving.

  6. Studder under load, P0301 Code

    Hi all, could use some help. 2006 Mazdaspeed 6, air intake upgrade, Cobb stage 1 tune. Yesterday, the car started stuttering under load and threw a P0301 code. As the car warmed up, it got better, but still a noticeable studder on easy acceleration. Spark plugs had 90,000 miles on them, so...
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