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Oct 24, 2009, 05:39 PM
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#1
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Evolving Member
Personal Sales Rating: ( 16)
Join Date: Mar 2008
Location: Florida
Posts: 193
Drives: lancer evo Ix mr
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Is my tune f****** up or my o2 sensor is ?
PLEASE READ I NEED HELP !!!!!!!!!! THANKS
I need help fast . I got my evo tuned on the stock ecu 2 months ago everything was perfect the car ran strongs I made 560whp on e85 @ 33 psi on 35r and the a/r ratio would always be 11.9 all the way to red line. I didn't race the car for 3 week's last night I wanted to race and as soon as I floored it I realize that a/f went to 12.8 by 7k I new something was wrong I cheked for boost leaks found nothing , I also checked for fuel leaks nothing , my fpr pressure was at 45 I raised it up to 55 and did a 3 gear pull and the a/f was 12.6 and the higher I rev it the leaner it got .... I lowered the boost to 30psi and the a/f was still 12.9-13's
Is my tune messed up or is my wideband o2 sensors not reading correctly please help? WHAT CAN I DO ABOUT THIS PROBLEM? THANKS
Last edited by Dragking2189; Oct 24, 2009 at 05:47 PM.
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Oct 24, 2009, 05:49 PM
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#2
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Evolving Member
Personal Sales Rating: ( 16)
Join Date: Mar 2008
Location: Florida
Posts: 193
Drives: lancer evo Ix mr
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Oopsss posted in wrong section !!!! Sorry
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Oct 24, 2009, 05:53 PM
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#3
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Account Disabled
Personal Sales Rating: ( 91)
Join Date: Sep 2003
Location: 2003 Evo VIII - Silver
Posts: 16,826
Drives: 9.50 @ 148 (no nos)
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E 85 has been known to be of varying quality as they mix it in the tank
Check for mis fires also
Al
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Oct 24, 2009, 06:53 PM
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#4
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Evolving Member
Personal Sales Rating: ( 16)
Join Date: Mar 2008
Location: Florida
Posts: 193
Drives: lancer evo Ix mr
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no misires at all ... the car pulls hards it just that the wideband shows 12.6-13's a/f ratios. could it be that the sensor on the aem wideband is bad? I also changed the plugs and drained the tank and filled it up with fresh e85?
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Oct 24, 2009, 07:12 PM
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#5
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Evolved Member
Personal Sales Rating: ( 38)
Join Date: Nov 2006
Location: Boston, MA
Posts: 1,676
Drives: '06 RR Evo IX SSL
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The difference in temperatures can create AFR swings of 1.0 point or more. It's possible that colder, denser air is making the car run that much leaner.
If you've been getting your fuel from the same station, it's unlikely the fuel to blame, as E85 is usually about 80% Ethanol in summer months and 70% Ethanol in winter months, but it varies depending on state & source. If you were tuned on higher percentage Ethanol, and the station switched to a lower percentage, your tune would have gotten richer, not leaner.
A boost leak would not be to blame either for a leaner mix, only a richer one.
Leaning out towards the top end implies a fuel flow limitation. What's your fuel pump setup? If you have a double pumper, you may be operating on only one pump.
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Oct 25, 2009, 02:57 AM
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#6
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Evolving Member
Personal Sales Rating: ( 16)
Join Date: Mar 2008
Location: Florida
Posts: 193
Drives: lancer evo Ix mr
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I have a full blown with 2 walbros inside the tank Aeromotive -10 fpr with -8 feed lines &-6 return 1600cc injectors and a perrin fuel rail
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Oct 25, 2009, 08:09 PM
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#7
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Newbie
Personal Sales Rating: ( 1)
Join Date: Feb 2004
Location: Columbus, Ohio
Posts: 56
Drives: 07 Built 30R STI
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Possible one was bit the dust. Al I believe had an incounter with this problem once before.
__________________
Roll quiet, but pack a big turbo!!!
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Oct 26, 2009, 01:05 PM
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#8
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Evolving Member
Personal Sales Rating: ( 16)
Join Date: Mar 2008
Location: Florida
Posts: 193
Drives: lancer evo Ix mr
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Is there anyway to clean the sensor?
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