Studder under load, P0301 Code

G

guitarcal

Greenie N00B Member
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 changed those first, but did not solve my problem. The pulled spark plugs looked good, cylinder 1 maybe had slightly more build up than the other 3 but nothing out of the ordinary

I've swapped coil pack 1 and 4 as the next test, but wanted to upload my accessport logs to see if the experts see anything here. I kept it easy, but there was noticeable studder around the 2000k rpm range.

Any thoughts? If I get an error code on cylinder 4 now, do I need to stick with oem coil packs, or can I go aftermarket?

Thanks!
 

Attachments

Easter Bunny said:
Only use OEM coil packs. What is the spark plug gap set to
Click to expand...

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.
 
Easter Bunny said:
Check continuity through the harness look for damage make sure the pins are making contact
Click to expand...

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.
 
Thank you for the update/feedback on your fix.
Please think about a custom tune. You will never think the money was a waste after the results.
 
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