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It really sounds like it's time for a turbo replacement. Ill have a look at the logs tomorrow when i have access to a computer. Is there a noticeable loss of oil? If you get a chance pull some intake components and look for pooling oil. These engines suffer from weak PCV systems and when...

-7 is not a terrible fuel trim. Even -10 can be acceptable, it is why your ECU has the power to compensate for it without adverse effects to your performance. Codes usually come up when your system would like to apply a trim that is larger than its limits (+/-25). I think there is a lot of push...

Please post a log. The ECU reads MAF voltage, this voltage is then referenced on a table. This table has a corresponding air mass (g/s) for a specific voltage. If you change the dynamics of the airflow through pipe size, material or shape, this table is no longer appropriate for your set up -...

Upstream O2 sensor is used for reading AFR. You have an aftermarket CAI and/or TIP running OTS. -20 trims is too much, Did you calibrate the MAF table? If you did not calibrate the MAF, this needs to be done first. This can be done through a tuner or you can get ATR through COBB and modify it...

I have seen these issues on mazdaspeed3s and Mazda 3. On my Mazda 3 I have had the main relay contacts go bad. The immobilizer light would blink. The solution was to clean the main relay contacts. On the speed3, there was a fuse in the PJB that would blow due to a shorting coil harness. As it...

Well, we are trying to diagnose the problem, and log frequency is not a priority yet, so I recommend you capture all sensors. This way It gives me opportunity to catch any data that doesn't look right. If you are using access port, this shouldnt be difficult to do. At the very least, try to...

Continuing from the other thread: IF you had 0% throttle at idle, your throttle plate would be closed and your car will starve. As L337 said, its required for idle and I wouldn't assume your throttle body is bad because of that. Please record another log with ALL sensor values enabled. If you...

I just realized that you have a separate thread for your concerns, I Will continue this diagnostics there.

Did all 4 plugs look the same? Was there an outlier? See if you can modify your logger to collect all sensor data for this test. I am specifically interested in Accel. pedal position (APP) and Coolant temp. Based on what I can see, - Your vacuum readings are OK, I don't think you have a...

Can you share a log? Try pulling all 4 of your spark plugs and compare what the ends look like, are they all the same?

Hello All, Among the various little annoyances I have been diagnosing, one concern is the cold start performance of the car. Behavior: - Cold engine (overnight), start and drive the car. - Throttle response is very slow. - holding steady throttle (I.e. 20%), the car will not have a steady...

Are you getting the same DTCs?

Maybe you got a batch of bad ACT pressure plates or something out of spec? Im surprised OEM slave didn't work for you L337.

Make sure you confirm they can get them. When I tried to buy them, there was a 4-6 month lead time before they can get them in stock. Even though they list them as "Available" on their website.

I missed these comments. I wouldn't be bothered by KR if it didn't interfere with my throttle response under load, but it does. I am guessing I am the only one experiencing the slow KR decay and its effect on performance?

Since this problem only appeared after you did that work, I would criticize only the parts you touched. The TB gasket should be replaced. Do that and make sure you torque it to spec. It is also recommended you tighten in stages to ensure the gasket seals properly. Each bolt to 5Nm, then 10Nm...

Interesting progress, thanks for posting this update. I don't know how pulling timing will help as its supposedly pulling timing for fuel efficiency, not knock detection. Can you compare your ignition timing advance between the 8KR limits and 15KR limits, is it reflected in the actual ignition...

The computer I am using doesn't have excel but i will list my observations based on your comment. It sounds like something went wrong in the process changing downpipes, or there is a coincidental part failure. Did you change OTS tune between your DP swaps? When you cleaner your throttle body...

What fuel pressure are you seeing? Are the injectors firing?

Turbos are a very common issue on these cars and smoking is one of the main symptoms. Power loss may be a number of things including compression. 3K for a gen 2 is a really good deal assuming the body is in decent shape. Repair difficulty is only relative to your experience with mechanical...