10-03-2008
|
#1
|
Kevin
Join Date: Jan 2004
Location: Shoreview
Posts: 3,356
|
Lean at Idle
My AEM o2 says normaly "---" which is max lean at idle, sometimes its between 18:1 and like 15:1. While cruising, the car sits at like 14.7 as it should.
Any ideas?
__________________
Misses the Mitsu Community
Currently on Corvette #4
|
|
|
10-03-2008
|
#2
|
Finally Tuned...
Join Date: Apr 2006
Location: Zimmerman
Drives: Spyder GSX
Posts: 2,484
|
Re: Lean at Idle
Mine does the same thing. Where is your sensor placed in your exhaust system? How far down? Mine is where the second o2 us and I am thinking of moving it up farther but you dont think that should matter since when they dyno a car its at the very back tailpipe.
__________________
94 Supra TT Auto, Project 9.xx in the works
97 Spyder AWD 6 bolt 2.3, 579hp 496tq **FOR SALE**
Amsoil Dealer
|
|
|
10-03-2008
|
#3
|
is Nashty
Join Date: Oct 2007
Location: Stillwater
Drives: Cyborg from Japan
Posts: 2,080
|
Re: Lean at Idle
Wouldn't it make sense to have the car idle lean? Cars usually dont use up that much fuel just idling.
__________________
-1990 Mitsubishi Cyborg 4WD-
|
|
|
10-03-2008
|
#4
|
Kevin
Join Date: Jan 2004
Location: Shoreview
Posts: 3,356
|
Re: Lean at Idle
I thought it'd be at 14.7...
My sensor is 36" away from the turbo outlet, per the AEM instructions, which on my 1g places it just behind the axel and between the crossmember. Perfect
__________________
Misses the Mitsu Community
Currently on Corvette #4
|
|
|
10-03-2008
|
#5
|
Banned
Join Date: Sep 2008
Location: @ The Track
Drives: ... More than you can afford, pal
Posts: 100
|
Re: Lean at Idle
Quote:
Originally Posted by sleepydsm
I thought it'd be at 14.7...
My sensor is 36" away from the turbo outlet, per the AEM instructions, which on my 1g places it just behind the axel and between the crossmember. Perfect
|
Have you gotten your car tuned prior to installing the WB?
Better yet, are you on a stock ECU?
|
|
|
10-03-2008
|
#6
|
Kevin
Join Date: Jan 2004
Location: Shoreview
Posts: 3,356
|
Re: Lean at Idle
yeah, stock ecu, pretty much stock everything else. Has a stock set zero'd out MAFT and stock 450s. Aeromotive AFPR and walbro 255hp. stock 14b also. stock 6 bolt kinda.
__________________
Misses the Mitsu Community
Currently on Corvette #4
|
|
|
10-03-2008
|
#7
|
Banned
Join Date: Sep 2008
Location: @ The Track
Drives: ... More than you can afford, pal
Posts: 100
|
Re: Lean at Idle
Quote:
Originally Posted by sleepydsm
yeah, stock ecu, pretty much stock everything else. Has a stock set zero'd out MAFT and stock 450s. Aeromotive AFPR and walbro 255hp. stock 14b also. stock 6 bolt kinda.
|
Then I probably wouldn't worry about it. The stock ECU adjusts fuel trims as it sees necessary.
|
|
|
10-03-2008
|
#8
|
aka Goodbye
|
Re: Lean at Idle
Mine does the same thing, and it's not right. In closed loop, your a/f should hover around 14.7, that's where it's supposed to be. Mine goes lean and the idle drops to 900rpm and it stumbles. I haven't had time to mess with it, it might be the removed honeycombs on my maf, I'll find out soon enough.
__________________
2009 Corvette Z51-SOLD
1992 Mitsubishi Eclipse GSX-SOLD
2013 BMW Z4-Current summer hooptie
2017 GMC Yukon-Current winter hooptie
|
|
|
10-03-2008
|
#9
|
Is funding Exxon.
Join Date: Oct 2003
Location: Ham Lake
Drives: like a bat outta hell!
Posts: 7,983
|
Re: Lean at Idle
Sleepy, it sounds like your WB is probably getting too cold and not giving a reading any more. Mine used to do that at idle sometimes too. I was actually too rich causing the sensor too cool too much at idle. I can really see the problem with it being that far away from the engine, that is a long ways away.
__________________
Is burning corn and stayin' warm!
My motorcycle is stock and reliable, my Talon is neither!
|
|
|
10-03-2008
|
#10
|
Banned
Join Date: Sep 2008
Location: @ The Track
Drives: ... More than you can afford, pal
Posts: 100
|
Re: Lean at Idle
My WB is right where it sounds like Kevin put his. 1" behind the half shaft @ the center of the motor and mine didn't cool. I thought they were self-heated?
One thing I do know for sure is DO NOT put it right where the turbo outlet is if it's a street car. Mine burned up in 2 months @ that spot.
|
|
|
10-03-2008
|
#11
|
aka Goodbye
|
Re: Lean at Idle
Quote:
Originally Posted by dsm9sec
One thing I do know for sure is DO NOT put it right where the turbo outlet is if it's a street car. Mine burned up in 2 months @ that spot.
|
Yep, had that same thing. Put it in the stockish location and went through three sensors in 600 miles. I've been on this new one all year around 1500 miles.
__________________
2009 Corvette Z51-SOLD
1992 Mitsubishi Eclipse GSX-SOLD
2013 BMW Z4-Current summer hooptie
2017 GMC Yukon-Current winter hooptie
|
|
|
10-07-2008
|
#12
|
New Member
|
Re: Lean at Idle
Mine was doing the same thing and it turned out to be an exhaust leak. If you were running that lean, you would be maxing out the FT's and ending up with a Fuel Trim Malfunction (Bank 1) CEL, so it sounds like your exhaust leak is somewhere between the front O2 and the WBO2. Mine was a blown O2 housing to DP gasket.
__________________
-Nathan
|
|
|
10-07-2008
|
#13
|
formerly ecoli
Join Date: Oct 2003
Location: On the dyno
Posts: 4,892
|
Re: Lean at Idle
1Gs don't throw fuel trim errors, thats an OBD2 function.
|
|
|
10-07-2008
|
#14
|
New Member
|
Re: Lean at Idle
I didn't realize that it was a 1g. Anywhere around here where you can find what vehicle people have? I'm new, so I don't know anyone and can't seem to find anything in anyone's profile.
__________________
-Nathan
|
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
|