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Update- took it to the dealer and they did a internal diagnostic on my cylinder head and found a burnt exhaust valve on cylinder 4, so I’m looking at a pretty hefty fix. Anyone got any heads laying around they are trying to get rid of? Will pay if the price is right

Mod list - Corksport Sri Rear resonator delete edit- this is how she is currently running

Oh , I was told by Zach at corksport that the Sri can be installed and run without a tune, I’ve had it on there for about a year now and with or without it my car is still bucking at wide open throttle with a changing misfire, at first a year ago it was cylinder three that gave me the most issue...

I have the corksport sri and it looks like it does have a plastic inner housing around the mass air flow sensor, this one to be exact https://www.google.com/amp/s/corksport.com/amp/mazdaspeed-3-short-ram-intake.html

Not yet but what logs do you need I can do readings on my scanner in a moment These are all the stats I can get you guys at the moment my scanners not the best (Cold start) I did a compression test 3 months ago and I tested 175,175,175,160

Another new coil in number four and she still has a rough idle I’m all out of ideas here guys I could really use some help

Update I started the car this morning and drove her around and she threw a cylinder 4 misfire and a p0300 random misfire on the drive edit- I purchased a coil at Autozone today to try that after work on cylinder 4 just in case.

So I unhooked the battery for 20 minutes and started it back up, the idle is still a little rough and when I give it gas it idles up but still a bit rough

And it won’t hurt to drive it while it’s idling rough like this? Like when I push the clutch in it drops to about 300 rpms

After I disconnect the battery should I just start it and let run for awhile?

Cleaned the mass air flow sensor and it’s still running like it has a misfire Edit- fuel pressure at idle is about 700-750 Is there maybe a idle relearn I have to preform from it sitting with no batter for two days ? Maybe a ecu reset?

Put the valve in today along with new inter cooler boots and new plugs and oil and she is running but with a p0113 code and she sounds like she’s misfire still but no misfire code

Test it like on the vehicle? Of course I’ll make the instal tomorrow I was just confused on the valve because it was mentioned I should be able to blow through it and I can’t, even the new one is sealed with no air flow, is that because they are spring load to a certain pressure? Sorry just new...

So I just got the new pressure relief valve in today and I’m checking it to see if I can blow air through it and I can’t blow through this one either? So what’s my next step? Was my old one even bad? Why did I order one if the new one is acting the same?

Does anyone have any good write ups on cleaning the spill valve for the hpfp? It’s gonna be two days on the fuel pressure relief valve so I might as well clean the spill valve while I’m here right?

So 15 mins in and I got the pressure release valve out. No coolant lines removed it was a relatively easy removal, now from what I read from you guys I’m supposed to be able to blow through this thing atleast one way right? Well it’s completely clogged no air through either direction and it was...

So I turned the car on today to try and check fuel trims and it was still misfiring on one cylinder which was number 4. I pulled the plugs out after only having them in for 2 days and they look like this (left to right 1-4) what should my next step be? New plugs and a retest? Or is this motor done?

When I go to plug in the scan tool and check fuel trims and fuel pressure at idle what numbers should I expect as far as short and long term fuel trim

Ok I will check it soon shouldn’t be to hard to remove, I did however see a video where a guy had to pull hiS coolant hoses off? Is that correct ?

Is it also cleanable? Like does it work the same way as a pcv valve? If I pull it off and test it can I spray it with carb clean?