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Old 11-10-2020, 04:48 PM   #1
Inflict89
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WRB Pearl

Default 2006 wrx flashing cel under wot

hey all, i have done all the typical misfire checks. I've done the following:

Clean Maf sensor
New spark plugs (gapped at 0.028)
Inspected all coil packs (did swap 2 to 1, but since no stored CEL i have no idea what cylinder is misfiring)
Completed a compression test this morning
Cylinder 1: 122
Cylinder 2: 124
Cylinder 3: 124
Cylinder 4: 120

Replaced in-tank fuel filter and fuel pump sock as well.

Did a datalog (included below) and only see roughness counts on cylinder 3. Swapped coilpack with cylinder 1 with no change***8230; I was thinking possibly injectors but looking at the datalog i'm assuming it's not that.

Only modification change in the last 6 months is a new clutch and lightweight flywheel. Car was tuned with the factory clutch kit and flywheel, so i'm unsure if that would contribute like it used to for the ej20's.

Any help would be appreciated, thanks in advance.

PS Data log was cut short due to having a dinosaur V2 and sometimes it stops datalogging mid-way.
Datalog: https://docs.google.com/spreadsheets...it?usp=sharing

modlist:
vf48
13 sti tmic
walbro 255
invidia catless downpipe
spt intake
grimmspeed ebcs
protuned back in 2014 by Sean at Church in LA
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Last edited by Inflict89; 11-10-2020 at 05:10 PM.
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Old 11-10-2020, 04:55 PM   #2
BlackFighter
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Quote:
Car was tuned with factory kit and flywheel
What do you mean by factory kit? There is no factory kit from Subaru to tune. Lightweight flywheel and light crank pully sometimes work funky on idle and WOT. If not, then go get it tunes on a dyno.
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Old 11-10-2020, 05:02 PM   #3
Inflict89
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Quote:
Originally Posted by BlackFighter View Post
What do you mean by factory kit? There is no factory kit from Subaru to tune. Lightweight flywheel and light crank pully sometimes work funky on idle and WOT. If not, then go get it tunes on a dyno.
Factory clutch and flywheel. edited first post.
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Old 11-11-2020, 12:02 AM   #4
benflynn
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I swear I remember lightweight flywheel giving misfires somehow
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Old 11-11-2020, 09:10 AM   #5
BlackFighter
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Quote:
clutch and lightweight flywheel
It says in your post "lightweight flywheel". What is a factory tune kit? If it was tuned with a stock flywheel and then you put in a lightweight FW. That might be your problem.
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Old 11-11-2020, 09:41 AM   #6
Max Capacity
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Yes, I seem to recall that a LWFW that was was 14lbs. would cause an issue. I think my LWFW is 17 or 19lbs. in my 2005 Legacy GT. I also recall from back in the day, not to also do a LWCP.
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Old 11-11-2020, 10:07 AM   #7
BlackFighter
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Yap, Mine was giving me major issues until I got it to Jr and he tuned it properly.
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Old 11-11-2020, 02:26 PM   #8
Inflict89
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Originally Posted by BlackFighter View Post
Yap, Mine was giving me major issues until I got it to Jr and he tuned it properly.


Quite possibly the issue. Just confirmed weight on the flywheel and itís 12.5lbs. Would a retune solve the issue? Iím almost leaning to throwing a factory flywheel back in.
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Old 11-11-2020, 03:47 PM   #9
BlackFighter
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If its a good tuner and if that is the problem then it should fix the issue. But it has to be a dyno tune, not some e-tune or "Factory Tune kit" which I still have no idea what that it.
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Old 11-11-2020, 03:48 PM   #10
BlackFighter
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What FW is it?
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Old 11-11-2020, 04:52 PM   #11
Inflict89
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Default 2006 wrx flashing cel under wot

Quote:
Originally Posted by BlackFighter View Post
If its a good tuner and if that is the problem then it should fix the issue. But it has to be a dyno tune, not some e-tune or "Factory Tune kit" which I still have no idea what that it.


I never said anything about a ďfactory tune kitĒ i said it was the factory kit and flywheel which I edited to read factory clutch kit and flywheel.

Itís an Action Clutch lightweight flywheel.

Iíd like to move to a different tuner as Sean is a pain in the ass to get a hold of. I wish Ron did ejís still and his dyno wasnít broken... I guess Yimi sport would be a good option.. Iíd like to avoid an e tune as this is my wifeís car and rather it all get dialed in during one session.

Last edited by Inflict89; 11-11-2020 at 05:09 PM.
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Old 11-22-2020, 08:32 PM   #12
Inflict89
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Update. Decided to unplug the maf and start the car... low and behold she idles perfect.. leads me to think this:

Bad maf
Bad front o2
Post maf leak

Iíll be putting together a smoke tester over the long weekend and see if I can rule that out before throwing parts at the thing. Anyone have any other ideas?
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Old 11-26-2020, 11:20 AM   #13
K3rm1tth3fr0g
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Quote:
Originally Posted by Inflict89 View Post
Update. Decided to unplug the maf and start the car... low and behold she idles perfect.. leads me to think this:

Bad maf
Bad front o2
Post maf leak

Iíll be putting together a smoke tester over the long weekend and see if I can rule that out before throwing parts at the thing. Anyone have any other ideas?
Replace the maf forsure if it's a 2006
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Old 11-26-2020, 05:02 PM   #14
Inflict89
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Quote:
Originally Posted by K3rm1tth3fr0g View Post
Replace the maf forsure if it's a 2006


Yeah, I had taken the car to a shop a number of years ago due to some phantom knock issues. They said it was the maf and they ďchanged itĒ. Iím confident at this point they didnít because the previous owner used RTV to ****ing put it in... needless to say Iíll be buying a new maf and will be trying to carefully remove the one thatís there smfh.
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Old 11-29-2020, 11:46 PM   #15
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Any update on this?
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Old 11-30-2020, 11:21 AM   #16
Inflict89
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Quote:
Originally Posted by connoredm View Post
Any update on this?


Took the weekend off from any headache lol. Ordered a new maf sensor. Since the old one was installed improperly using rtv Iíll likely be doing this Friday night/Saturday as itís my wifeís daily.

Iíll keep this updated till I solve it to help others. But Iím leaning toward MAF or front o2 at this stage.
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Old 12-02-2020, 10:05 PM   #17
Inflict89
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Update. New OEM maf came in this evening so I got to work. Old maf was stuck on there due to the last owner using a ton of rtv on it... after some prying I got it off. Cleaned off the RTV and put her back together. Let idle relearn, took a quick drive around the block and everything felt way better than it had in a very long time... did a quick pull and no more flashing cel and pulled hard to redline.

This is a major reason why I stopped going to "reputable shops" as the last shop I took it to claimed to have changed it and charged me over $150... clearly it wasn't changed. At the end of the day I learned the engine still has great compression for having 105k on the clock.

Didn't take a pic of the mess that was on the intake***8230; but looking at the maf i'm sure you can imagine***8230; intake cleaned up nicely.

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