Leaning out at 1500 rpm.
11-11-2008, 05:52 PM
#1
0.0 BAR
Thread Starter
Join Date: Nov 2008
Posts: 21
Leaning out at 1500 rpm.
Setup
LS/vtec
stock gsr head
stock b18a block
ps9 with 1 wire vtec
turboedit v 3.1.9
dsm 450s
gm 3 bar
I'm just starting to tune my car. I got it to idle fine, when warm.
However if i rev it up the a/f will be around 13, from 1000rpm to 1500rpm, just in neutral no load. At 1500 rpm and about 28inHG it will all of a sudden turn really lean, past what my wideband can read. (over 17:1). So i added more fuel in turboedit at that spot on the map, but the same thing happened. I added almost %30 more fuel in turboedit but nothing changed. So i thought it might be fuel pressure dropping or something like that, i hooked up a gauge and it stays around 40-44 psi.
The map sensor is putting out the correct voltage, .384 at ~28-30inHg . But i do get code 13, baro. I disabled the code in turboedit, but it will turn back on after like 10 seconds for some reason.
Any ideas of why this is happening? The fuel returns to normal after about 2200 rpm when driving.
LS/vtec
stock gsr head
stock b18a block
ps9 with 1 wire vtec
turboedit v 3.1.9
dsm 450s
gm 3 bar
I'm just starting to tune my car. I got it to idle fine, when warm.
However if i rev it up the a/f will be around 13, from 1000rpm to 1500rpm, just in neutral no load. At 1500 rpm and about 28inHG it will all of a sudden turn really lean, past what my wideband can read. (over 17:1). So i added more fuel in turboedit at that spot on the map, but the same thing happened. I added almost %30 more fuel in turboedit but nothing changed. So i thought it might be fuel pressure dropping or something like that, i hooked up a gauge and it stays around 40-44 psi.
The map sensor is putting out the correct voltage, .384 at ~28-30inHg . But i do get code 13, baro. I disabled the code in turboedit, but it will turn back on after like 10 seconds for some reason.
Any ideas of why this is happening? The fuel returns to normal after about 2200 rpm when driving.
11-11-2008, 06:19 PM
#2
1.5 BAR
Join Date: Nov 2005
Location: Harford Co. MD
Posts: 1,241
Re: Leaning out at 1500 rpm.
make sure there isnt an exhaust leak before the wideband. I had that issue a month ago, added like 100%fuel, and was still lean. had a big holw in my flex section. letting fresh air in the exhaust thsu ------- up the reading.
Could also be a dieing o2 sensor...
Could also be a dieing o2 sensor...
11-11-2008, 07:30 PM
#3
0.0 BAR
Thread Starter
Join Date: Nov 2008
Posts: 21
Re: Leaning out at 1500 rpm.
Ill check that, because i'm pretty sure there is a small leak. But its weird because i get normal readings from the O2 when idling or driving outside of that range.
The wideband oxygen sensor is brand new too.
Doesn't 28inHg seem like alot of vacuum? or is this normal?
Maybe the ecu thinks its actually decelerating, and cuts the injectors?
Any thoughts
The wideband oxygen sensor is brand new too.
Doesn't 28inHg seem like alot of vacuum? or is this normal?
Maybe the ecu thinks its actually decelerating, and cuts the injectors?
Any thoughts
11-12-2008, 03:29 AM
#7
0.0 BAR
Thread Starter
Join Date: Nov 2008
Posts: 21
Re: Leaning out at 1500 rpm.
Originally Posted by CoreyR
no way in hell is that motor making 28-30inhg of vacuum. i would get a new gauge first and then see.
I think it's a little under 0 when the car is off. so it probably reads a little high.
I'll get pics and try to get a better reading soon.
EDIT:
The gauge was way off. It was reading 28-30, but i hooked up a better vacuum gauge and it read about 22.5inHG.
Lesson learned, Don't buy cheap vacuum/boost gauges!
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