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Old 10-16-2019, 10:38 PM   #1
WRX_Spec_R1
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Member#: 491009
Join Date: Sep 2018
Location: British Columbia, Canada
Vehicle:
2003 WRX Spec R1
Sonic yellow

Unhappy Misfire at 5k RPM's

Hi everyone,

So I have been having an issue where my 2.0L 2003 WRX Spec R1 wagon misfires at high rpm in 3rd gear. It only really happens if I shift down from 4th to 3rd, and do a pull from 4000+ rpms. I don't normally do this, but recently did, and noticed the misfires. If I do a pull from <3k, it doesn't misfire until around 5k, and only briefly. I also noticed that sometimes it will pause at 4k, drop to 3500, then continue to go up. Almost always only in 3rd. I am not getting any CEL. It recently was misfiring in cylinder 4 due to a bad coil, but now has a new one in, and the misfiring stopped (until now). Could it be a spark plug or another coil?

Not sure if it's related, but I recently put a new map on the car (15psi, the next map will be 18psi), and that's about when I started noticing the misfires. Before that it was at 7psi, as I just installed a new turbo.

The car is a stage 2.5, with a VF48, InjectorDynamics injectors, intercooler, short ram, AEM fuel pump, and Killer B oil pickup and baffle.

Thanks!
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Old 10-17-2019, 12:47 PM   #2
Jedi03
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Member#: 491095
Join Date: Sep 2018
Chapter/Region: SWIC
Location: New Mexico
Vehicle:
2009 STi Blue
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check your spark plug gap, swap coils around and see if moves, make sure coil is fully plugged in, make sure using quality fuel, compression test...a lot of different viarables are possible
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Old 10-17-2019, 08:38 PM   #3
WRX_Spec_R1
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Member#: 491009
Join Date: Sep 2018
Location: British Columbia, Canada
Vehicle:
2003 WRX Spec R1
Sonic yellow

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Quote:
Originally Posted by Jedi03 View Post
swap coils around and see if moves
The problem with swapping them around is that I don't have a CEL code telling me which cylinder is misfiring. Is there a way to tell which cylinder it is without a code?
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Old 10-18-2019, 03:50 PM   #4
bugeyerex02
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Member#: 195967
Join Date: Nov 2008
Chapter/Region: NESIC
Location: Massachusetts
Vehicle:
2002 WRX
WR Blue

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thats odd that you arent getting codes from misfires, especially consistent misfires. do you have the misfire codes off on the map?
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Old 10-18-2019, 07:16 PM   #5
subarumod
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Join Date: Jun 2017
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06 wrx
black as your girls soul.

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Im having the exact same issue...
no matter if I go from 0-7krpms or start it at 4k rpm it always, it always flutters/stutters/crackles n pop without having any power and acts like complete crap

Most times it doesnt throw a code, but If I just step on it and try to take it as far as i can go, it will throw a check engine light that only lasts for about 30seconds then disapears..

The thing is prior to this, in a year span I would get a few random check engine light and would say misfire on 3... and the same with this code the couple times it actually stayed on the dash and let me read it, misfire on 3..

have your AP plugged in and do a decent pull, try catching it..

Im going to try changing the coil pack on #3 and see whats up.. I assume new spark plugs wouldnt hurt, been about 3yrs..

We got lucky. better spark plugs or a coil pack than something major.. Well I hope is the case for you as well
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Old 10-18-2019, 08:26 PM   #6
WRX_Spec_R1
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Member#: 491009
Join Date: Sep 2018
Location: British Columbia, Canada
Vehicle:
2003 WRX Spec R1
Sonic yellow

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Quote:
Originally Posted by bugeyerex02 View Post
thats odd that you arent getting codes from misfires, especially consistent misfires. do you have the misfire codes off on the map?
I learned today that it only does it when the engine is cold, and even then it doesn't always do it. I believe it's because I made the mistake of pushing the car too hard while the engine was cold, thus in a richer state, causing mild misfires/lurches. I don't think it was major enough to trigger a misfire code, or if it did, didn't last very long. And no, the map shouldn't have the codes off.
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