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Old 06-14-2013, 02:31 AM   #1
beef
Scooby Newbie
 
Member#: 138895
Join Date: Jan 2007
Chapter/Region: SCIC
Location: ventura
Vehicle:
2002 WRX

Default Running super lean!! Help

Car is a WRX open source tuned. Mods that matter are:
2.0L Vf39
UEL Headers
Up/Dp Catless
3" Exhaust-Catless
Turbo Inlet
CAI (I Know)
Modded Stock Injectors
Large TMIC


It was tuned about 3 years ago with all the mods except the exhaust. Ran perfect after i installed the exhaust for 2 years. Out of nowhere 2 months ago it started popping at 6k during WOT pulls. AFR was @ 11.8-12.0 when it was happening. Best way i can describe the sound is a single pop version of an anti lag setup.I thought is was probably backfiring from an exhaust leak. I logged and couldn't find anything wrong. No Knock Anywhere. Drove it like this for a month. Recently i notice my intake was a little dirty. I took the filter off and cleaned it. When i went for a test drive, first pull was lean. 14.9-15.5 AFR WOT, still popping. When i logged again everything looked fine except AFR. Still no knock at all. I checked for leaks everywhere and couldn't find any. What parameters should i log so i can post a map for people to diagnose?
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Old 06-14-2013, 08:03 AM   #2
quazimoto
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Join Date: Sep 2004
Chapter/Region: MAIC
Location: Da-boonies,Va
Default

Check the fuel pressure.
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Old 06-14-2013, 10:53 AM   #3
mechatricity
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Member#: 290592
Join Date: Aug 2011
Chapter/Region: South East
Location: Charlotte, NC
Vehicle:
04 & 06 WRX Wagons
'15 WRX 6MT CWP

Default

generally lean in boost would indicate a pre-turbo but post-MAF leak (extra air being drawn in) or a fuel pressure issue. do you know what your IDC was at WOT prior to this happening? Definitely check fuel pressure, but logging IDC (don't go WOT obviously) may give you some indication of a fuel pressure problem.
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Old 06-14-2013, 11:35 AM   #4
beef
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Join Date: Jan 2007
Chapter/Region: SCIC
Location: ventura
Vehicle:
2002 WRX

Default

IDC was at 63% WOT. It is usually around 57-60%.I didn't log fuel pressure, i will today. Im going to keep looking for leaks as well.
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Old 06-14-2013, 05:10 PM   #5
beef
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Member#: 138895
Join Date: Jan 2007
Chapter/Region: SCIC
Location: ventura
Vehicle:
2002 WRX

Default

I went to log again and now my MAF is reading 0 all across the board. I disconnected it to see if it makes a difference, and the engine would barely idle and sputter when rev'd. Is the problem a bad MAF sensor, or a bad electrical connection? Dont want to spend $125.00 on a new MAF if i dont have to.

Last edited by beef; 06-14-2013 at 05:11 PM. Reason: Doh
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Old 06-14-2013, 05:31 PM   #6
mechatricity
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Member#: 290592
Join Date: Aug 2011
Chapter/Region: South East
Location: Charlotte, NC
Vehicle:
04 & 06 WRX Wagons
'15 WRX 6MT CWP

Default

Quote:
Originally Posted by beef View Post
I went to log again and now my MAF is reading 0 all across the board. I disconnected it to see if it makes a difference, and the engine would barely idle and sputter when rev'd. Is the problem a bad MAF sensor, or a bad electrical connection? Dont want to spend $125.00 on a new MAF if i dont have to.
log MAFv to be sure. You should see MAFv range between 1.3 and 5 IIRC. If it's electrical you'll almost certainly get a CEL. If the MAF croaked, you may or may not get a CEL. I feel your pain on the cost, but they do give out eventually.
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Old 06-16-2013, 10:41 PM   #7
beef
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Join Date: Jan 2007
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Location: ventura
Vehicle:
2002 WRX

Default

I logged some more. MAF looks fine. Everything looks fine except AFR. How do i post a log on here?
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Old 06-17-2013, 07:47 AM   #8
quazimoto
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Default

You need to host the file on Google Doc or something. Set it to public and then post the link to it. FYI-You can't log fuel pressure. You will need to get a fuel pressure gauge and install a schrader valve in the fuel rail feed line.
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Old 06-17-2013, 04:28 PM   #9
beef
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Join Date: Jan 2007
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Location: ventura
Vehicle:
2002 WRX

Default

Thanks! I found out i couldn't log fuel pressure after scrolling through parameters for 20 min.. Lol
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