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Old 10-11-2016, 03:14 PM   #1
Scooby Newbie
Member#: 448608
Join Date: Jun 2016
Location: Monterey, California
2004 WRX

Default Knocking or other issues?

I have an 04 WRX with a Invidia catless downpipe, megan racing catback, and Ver2 Accessport running the 91ACN off the shelf tune.

The current issue I've been facing is a surge or jump when doing longer pulls in 3/4 gears at higher load (read: 3-4 people in the car going uphill)

Now I've only really started looking into this because I was going uphill with 4 people in the car doing a 4th gear pull to merge on the highway and around 4000 rpm at full boost (~17.5 PSI) the car started to buck enough that the check engine light started flashing. The bucking wasn't completely aggressive, but it feels as though its pulling hard then I have a .5 second flash of no power or loss of power and then the power will kick back on full strength. My car has done this very infrequently before but this was the first time that it threw a code around it. The cell flashed for around 15 seconds and then turned off and there is no persistent code.

I'm assuming I'm getting knock and timing is getting pulled so I when to check my DAM with the AP and it returned a 9 consistent at idle. I reset the ECU and got 12 which stayed consistently that way through 5 mins of idle. I then went driving around and through various hard pulls I got it to go 12 down to 8 then back to 10 and then 11.

I'm running Shell 91 OCT gas in California with the appropriate tune as mentioned above

I'm planning to go get some MAF cleaner to see if that could be the issue and will report back but I'm looking for directions to go on.
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Old 10-11-2016, 03:45 PM   #2
Scooby Newbie
Member#: 450777
Join Date: Jul 2016
Chapter/Region: MWSOC
2002 WRX
Sedona Red Pearl


Sounds like misfire to me, but I'm no expert. Just throwing ideas to poke around about.

Heres a thread listing ways to possibly correct the issue if it is indeed misfire.

BTW - Your peak boost should be about 16.0 PSI if running OTS ACN91 Stage II. You may have some boost creep as well if your peak is 17.5.

Last edited by kris142b; 10-11-2016 at 03:55 PM.
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