running lean at idle

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Jan 27, 2017 | 03:13 PM

#16

kaj

EvoM Community Team Leader

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From: Fresno, CA

Quote:

Originally Posted by Ragin-Azn

Well now i gotta cel and no afr reading at idle lol. Cars idles smooth no issues still pulled my buddies 350whp sti so its runnin fine lol. Could it be a bad o2 sensor?

Quote:

Originally Posted by Laddy07

Ok I have a 2012 evo x .. just got tuned and has a rough start and idle running 14.5 then dropping to 18 and stays there for a bit to eventually make its way back up .. I also feel there is a loss in power. things I've done to try to fix the problem include :
New upgraded fuel pump and fuel line
Upgraded 1100 Id fuel injectors
Smoke test for leaks -- a leak in intercooler and leak is fixed
Freshly tuned

Codes : misfire in cylinder 4

My coils and sparks are fairly new ..can they really fault that fast

Could this be the reason she is running lean ? And idle bring all over the place .. please help

Is it only at idle? Does the idle change when you roll windows up, turn on AC/defroster, etc?

Nov 7, 2022 | 12:17 PM

#17

joshua proulx

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Joined: Oct 2022

Posts: 3

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From: sudbury Ontario

Quote:

Originally Posted by kaj

Is it only at idle? Does the idle change when you roll windows up, turn on AC/defroster, etc?

i have the exact same problem, idle is 14.7 then shoots up to 17 and idles bad, rough start sometimes… no codes though but my idle change when I use my windows. Wot is 10-11
Evo x 2008

Nov 7, 2022 | 03:03 PM

#18

kaj

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From: Fresno, CA

Quote:

Originally Posted by joshua proulx

i have the exact same problem, idle is 14.7 then shoots up to 17 and idles bad, rough start sometimes… no codes though but my idle change when I use my windows. Wot is 10-11
Evo x 2008

Do you have a mini battery?

Nov 7, 2022 | 06:23 PM

#19

joshua proulx

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Joined: Oct 2022

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From: sudbury Ontario

Quote:

Originally Posted by kaj

Do you have a mini battery?

i don’t understand, are you trying to ask if my battery is small? No it’s a deep cell battery off a boat lol works perfectly in winter. How does this effect idle?

Nov 7, 2022 | 08:33 PM

#20

kaj

EvoM Community Team Leader

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From: Fresno, CA

Quote:

Originally Posted by joshua proulx

i don’t understand, are you trying to ask if my battery is small? No it’s a deep cell battery off a boat lol works perfectly in winter. How does this effect idle?

My car had a few of the the same symptoms, for example running weird when I would roll the windows up and down. My theory was that my mini battery couldn't handle it. Especially shortly after the car started and it's partly drained. I went back to a standard size battery, and have not had the same problem since.. I tend to throw weird ideas out there, cuz there's the ones that tend to get me. It's never the common s*** LOL

Nov 8, 2022 | 08:53 AM

#21

Biggiesacks

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Joined: Aug 2005

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From: West Coast

what's the state of charge on the battery when this is happening?

If you charge the battery up fully, then operate the vehicle, does the problem persist?