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The PCM in my 2008 MS3 died, I have replaced it with a used PCM. How do I go about reprogramming it to the car for the immobilizer and stuff? If the dealer is the only way, can Ford do it? I don’t have a local Mazda dealer.

I find it super weird that for the first 20 minutes the car doesn’t have any issues, I can beat the day lights out of it, but randomly when driving the RPMS will just drop to idle, I won’t have any APP, I press the gas and get nothing, I’ll have to shut the car off and back on to start driving...

Well I said my throttle position was good but looking back at the log I posted, it’s kind of sporadic just like the APP. With KOEO, APP will read 0% with no pedal, press the pedal in it’ll goto 99%. With no pedal the throttle position is 0%, press the pedal in it’ll goto 78%.

Update: idle issue ended up being a clogged EGR (stuck open) threw on a EGR delete and it’s doing great now.

Why do you say purge valve? And what sort of leak, vacuum/boost?

PFA: P2138 and P2122, what was everyone’s fix? Troubleshooting? The car will run and drive great for around 20 plus minutes, then start having major hesitation/bucking issues with anything passed like 15-20% throttle. I have sent a log to my tuner showing him as it’s actively doing it, In the...

Year/Make/Model: 2008 Mazdaspeee3 Mileage: 155000 Location: Glasgow KY Concern: Very Choppy Idle, High KR 2-3k RPMs, Low Vacuum at idle, hesitation during partial throttle. DTC's: None Modifications: Damon OCC, CS HPFP Internals, CS Cat Back, GFB BOV, JBR Intake, Bosch 3.5 BAR MAP, NGK6510s...

So if I do the blow throw a hose test and the sensor reads different PSI, that means the sensor/connector/harness are good, correct? also I have a question on why the car won’t rev past 3800rpms? It sounds like it’s trying to build boost and 2stepping, but it instantly goes max lean 29.95...

Okay, scratch what I said about -12.5, idk what monitor I glanced at when I seen that but KOEO, it bounces between -0.01 and -0.06

Okay, great information! I’ll verify my KOEO value in the morning. If it’s actually 12.5 like I think I seen, is this just a calibration issue? Or is this a physical sensor/wiring issue?

I’ve had issues with MAP sensors, originally the car had a CS 3.5 bar map sensor which died, replaced it with a Bosch 3.5 bar w/pnp harness, the new sensor was DOA, had it warrantied and this data log is with the new 3.5 bar. He asked for pictures of the MAP sensors when I had the CS, go verify...

If I can get my hands on some compressed air I’ll pressurize the system and check for it that way.

Compression test revealed all cylinders had between 175 and 190PSI. I know the vacuum is super low for what it should be. KOEO, vacuum reads -12.5, but i for the life of me cannot find a vacuum leak. So back to my original thought of a with clogged injectors or something of that sort?

I tested the accelerator pedal was reading correctly, but not the throttle body. How do I test that?

I have a 2008 MS3 and im having a wild issue. It has a very choppy idle which causes stalling most of the time, and it has started randomly losing all accelerator pedal, as in I goto give it gas and it does nothing. Then when you pull over itll stall because its struggling to idle, and wont...

08 MS3 Rough Idle?! +20-24.80 STFT’s, AFR bouncing around between high 13’s to low 17’s. Vacuum at Idle is -4’s. Found a couple small vacuum leaks, including MAF sensor oring was broken. 1 revision in from Freektune, trying to get the issue lined out, any ideas? Justin emailed and said it was a...