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Car feels like running on 3 cylinders

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Old 05-22-2017, 03:17 PM
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Default Car feels like running on 3 cylinders

The car was put into winter storage in driveable condition (i would not go so far and name it tuned) last fall.

I started the car after winter storage today, warmed it up and went to drive with AutoTune,
approximately after 10 minutes of driving I saved Autotune changes to the MS
and the car started to feel like running on 3 cylinders.
Return to the last fall restore point did not make a difference.

Could someone experienced take a look at the logs and tune please?

Base tune from Reverant, injector parameters changed and 2-3 Autune sessions last fall.
MSM, MS Labs MS2E, 640cc Mustang GT500 injectors, GM IAT, MBC
Attached Files
File Type: msl
LIMP 2017-05-22_13.23.24.msl (2.91 MB, 69 views)
File Type: msq
2017-05-22_14.25.08.msq (108.8 KB, 56 views)
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Old 05-22-2017, 03:20 PM
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Does it sound like a subaru? What coils are you running (stock msm) ?
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Old 05-22-2017, 03:24 PM
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Stock coils, stock turbo, FM downpipe and exhaust,
VTCS disconnected
it doesnot sound like subaru
but i didnot push so much on accelerator
take a look on LIMP log file
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Old 05-22-2017, 04:29 PM
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Originally Posted by psyber_0ptix
Does it sound like a subaru? What coils are you running (stock msm) ?
Update:
I asked another person(Subaru owner) and he said: "Yes, it sounds like my Subaru WRX"
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Old 05-22-2017, 05:32 PM
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check coils
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Old 05-22-2017, 07:02 PM
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Thanks, 18psi

Could you please advise how to check the coils.

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Old 05-22-2017, 07:14 PM
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Originally Posted by irodd
Thanks, 18psi

Could you please advise how to check the coils.
pull spark plug from the cylinder, but plug it back into the sparkplug wire. Ground it against your ***** the valve cover while someone cranks & see if it sparks. Repeat for all 4 wires.
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Old 05-22-2017, 07:23 PM
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Thanks,
but in my case it is heat induced intermittent failure.
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Old 05-22-2017, 07:49 PM
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Originally Posted by wackbards
pull spark plug from the cylinder, but plug it back into the sparkplug wire. Ground it against your ***** the valve cover while someone cranks & see if it sparks. Repeat for all 4 wires.
LMFAO....
cheers I needed a good larf.
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Old 05-22-2017, 08:44 PM
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Originally Posted by irodd
Thanks,
but in my case it is heat induced intermittent failure.
That sounds like a dying coil thing to me. The easiest thing to do would be to swap in a known good one & see if it goes away.
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Old 05-22-2017, 10:57 PM
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If it's a heat induced failure check the cam angle sensor. Those are a known failure point and can lead to misfire-issues. Ask me how I know.

If you must know, I found out when stuck on the george washington bridge during rush hour when I was taking my GF home to meet my parents for the first time. It was the third breakdown that day and every time it was a weird misfire issue that went away after the hood was propped up and the car sat for a 10 minutes and cooled down.

Edit: I haven't looked at the logs so maybe this is something that would have shown up there.
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Old 05-22-2017, 11:15 PM
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Cam sensor failure would show up as a lost sync in the logs
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Old 05-23-2017, 09:52 AM
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Thank you, Gentlemen

I see "lost sync count" is zero in my log, so most likely it is COP failure

But may be someone take a look into the log.
I am still the beginner and can miss something important.
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Old 05-27-2017, 02:21 PM
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I have new Cam Position Sensor and Ignition Coils installed (original Mazda parts from dealership).
Also checked spark plugs and the gaps - looks healthy.
Nothing is changed - as soon as car fully warmed up it feels like running on 3 cylinders, sounds like Subaru, AFR is greater than 15.

I spent almost $400 on the parts :(

Could someone experienced take a look at the log?
(tune and setup in the first post)
I would pay for it, if nobody wants do it for free.

Is is starting from 400 seconds on the log
Attached Files
File Type: msl
2017-05-27_13.32.56.msl (2.67 MB, 62 views)

Last edited by irodd; 05-27-2017 at 02:43 PM.
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Old 05-27-2017, 09:35 PM
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why would you spend $400 on a cam sensor and coils when you did no diagnostics to confirm either was bad?


stop assuming ****. you literally have an output test mode in your firmware that you can use ti fire your coils and spark plugs to see if they (or the ms wiring) is bad... your logs already confirmed your crank/cam sensors were fine. you cray cray.


next time you log, as soons as you feel the issue, press the spacebar. nothing in that last log indicates any issue...
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Old 05-27-2017, 09:41 PM
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Everything is working properly first 10 minutes, It is failed on a hot engine only.
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