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Do a compression test wet and dry, and report the numbers.

Glad to help, that's what we are here for ;) And thank you for reporting back with the solution, hopefully it helps someone else.

Since you have no spark in any of the plugs, it narrows down the possibilities a lot. Here are a few places you can check for failures relating to ignition: 1. Check fuse F67 in the PJB (its under the glove box and kinda fun to get to). I have seen those blow due to a short at the main wiring...

This comment that you left was a bit deceiving, thanks for clarifying. If it isn't a huge deal, remove the oil catch can lines and revert to what you had before.

Good diagnostics on your part. Did the no start occur AFTER you started messing around with the HPFP? 1. There are several places but first answer this: a. Does the engine have a healthy crank? If so is it a constant crank or can you hear it stumble/try to start? b. I do not know what spark...

It sounds like the oil is being consumed. The OEM cat does a good job of controlling all kinds of exhaust. Pay attention to your exhaust on a cold start, you may see something. When someone comes to me with your problem, I rev the car relatively high while the car is parked and watch the plumes...

Do you have logs? Pull the spark plugs and take some pictures of the tips.

It looks like all variations of this 4 cylinder Mazda engine have the same valve stem design.

His fuel trims were bad prior to the latest tune, the newer tune fixes that issue. If you plumb your OCC incorrectly, It can cause pressure issues in your crankcase which would result in many possible problems. When you installed your OCC, did you take the intake manifold off the car to reach...

I sympathize with your frustration. I too have had an intermittent stutter/missfire at idle that I cannot put my finger on. Mine is pronounced at cold start idle though and I believe it is due to the VTCS delete. Your logs show very healthy operation, although your first log shows long term...

He is talking about the limitations that you have with flash tuning - and he is absolutely right. He is likely using Megasquirt on his miatas which is one of the most open source stand alone tuning options. Compared to the megasquirt, cobb offers very limited control over the ECU. That being...

All measurements with calipers, micrometers and bore gauges are subjective. But if the user is well trained, it is more accurate than tools like plasti-gauge

Aftermarket performance guides are available for these models, but they are typically there for cooling purposes. Although all components experience internal component wear, I don't recall seeing problematic guide/stem wear on these engines. I would expect these to wear faster if lubrication is...

I can appreciate this concern. And you may want to verify it prior to taking anyone's blind advice. Your aftermarket mods could affect your tune, however this may only be damaging under heavy loads. Check your logs, study what the values mean, ensure sensor values are acceptable. If something...

You calibrate the MAF to eliminate that as a possibility. If you have a pro tune, it was running fine, and now it can't stay running, then you have something failing on your car.

If it were a MAF cal issue, his fuel trims would stay consistently bad. His fuel trims are bouncing around within acceptable levels. Please read his log for this information. It seems like your ECU is trying to compensate for something. Is this log taken at operating coolant temp? Did you...

As with anything: grain of salt. I am probably going to get burned for saying this, but I think the OTS maps from COBB get too much flack for what they are. Ofcourse they are nothing compared to a custom tune, but what I read on these forums is a bit too far. My heavy footed driving proved that...

Thanks for sharing the solution, it's appreciated. My money is on the plugs being the main cause. Out of curiosity, was the stutter noticeable when the engine cold and hot?

When you get into boost, your car goes into "open loop" fueling, your car no longer uses fuel trimming to compensate. It will look for Knock Retard(KR) and if present, will add fuel based on the KR tables. So 0 LTFT and STFT under boost is expected. People call it a boost leak because you...

Turbo could could be unaffected in performance by the seals. In fact, you can have a turbo with no shaft play and bad seals. That being said, the main reason they fail is due to an unhealthy PCV system. Have you replaced your PCV valve? Unfortunately you can never be 100% certain on the cause...