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Old 01-30-2013, 08:11 AM   #1
aTriz
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PhatBotti e85 Tuned

Default 2011 WRX Rough Idle/Misfire after driving

I have a 2011 wrx and noticed that after I drive the car and it gets up to temp and turn it off go into the store/gas/etc. and come back out to start her up she has rough idle/misfire. After about 15-30 seconds of rough idling, the car runs perfectly fine after. I thought it was plugs because it was throwing the code for misfires in all cylinders but really need some help and input on what it could be. I just ordered new spark plugs and will be installing them this weekend but i'm hoping it's not worse? This all started I guess a few weeks after I went to e85 so maybe too much power for stock plugs? Please help me out fellas!

Mods
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Last edited by aTriz; 01-30-2013 at 08:17 AM.
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Old 01-30-2013, 10:14 AM   #2
rwfloberg
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Miles? could be fouled. plugs should be changed around 30k I believe.
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Old 01-30-2013, 10:26 AM   #3
kabob.master
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299awhp / 322tq @ 17.6psi

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Quote:
Originally Posted by rwfloberg View Post
Miles? could be fouled. plugs should be changed around 30k I believe.
Manual states 51k miles IIRC.

OP - could be due to many things. If I were you, I'd send a log to your tuner and see what he says.

Last edited by kabob.master; 01-30-2013 at 10:27 AM. Reason: typo
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Old 01-30-2013, 10:36 AM   #4
aTriz
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Only 18k miles
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Old 01-30-2013, 01:41 PM   #5
Tripintaz
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You might need to have your cold/warm start fueling tables adjusted. If your tuner skipped over this part while tuning for E85 then start up issues are usually the result.
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Old 01-30-2013, 02:42 PM   #6
Kicnit
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Quote:
Originally Posted by Tripintaz View Post
You might need to have your cold/warm start fueling tables adjusted. If your tuner skipped over this part while tuning for E85 then start up issues are usually the result.
What Tripintaz said ^^. I've never experience this exact problem, but I have a buddy that has. It was exactly what was mentioned above. We live in New England, and it started being an issue once the temps dropped to 40's or lower.

cheers,
kyle
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Old 01-30-2013, 05:18 PM   #7
aTriz
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Thanks fellas i'll email my tuner tonight and i'll keep it updated
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Old 01-31-2013, 05:38 PM   #8
aTriz
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https://docs.google.com/spreadsheet/...Xc&hl=en#gid=0

100% fuel pump duty at idle? I think maybe something to do with that, considering it goes to 33% when the rough idle stops. Maybe fuel pump is leaking or something no clue.
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Old 02-01-2013, 12:23 AM   #9
kabob.master
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What did your tuner say?
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Old 02-02-2013, 07:07 PM   #10
dsm_luck
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I have had this same issue in the past. Rough idle when engine is warm for about 30 seconds. If I let it sit it will smooth out. If I try to drive right after warm start it will every once in a while throw a misfire cel. I am sure it has to with cranking or startup tables. On the plus side with my modified cranking tables I have been able to one crank start my car on 100% E85 at 20 degrees.
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Old 02-02-2013, 08:09 PM   #11
aTriz
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^^ yep dsm exactly,

I talked to my tuner he said there is too much fuel on hot crank, but this is also an indicator of the plugs are on the way out.

So he's gonna adjust my map and I will be installing plugs next week!
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Old 02-03-2013, 01:04 AM   #12
2011boostdwrx
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just had thison my highly modded 11, but mine did it only at idle, was the FPR.
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