Having a problem running lean...
Thread Starter
Honda-Tech Member
Joined: Sep 2002
Posts: 241
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From: 808 State
Having a problem running lean...
hey guys. im wondering if anyone can help me regarding my situation.
my engine is running really lean at all rpms and at all throttle position ranges.
the engine doesn't even see boost and it still runs REALLY lean. i've replaced the inline pump to a brand new vortech t-rex unit, new 12:1 fmu, new bkr7e-11's, new aem adj.fuel pressure regulator, new gsr intank fuel pump, and new fuel filter. after changing out all of these items, the engine will still run lean. i've pulled the plugs and they indicate that the engine was in fact, running lean. (white electrode ends)
when i'm driving, the afr would jump into the 14's for a bit and then run all the way up to 20 and stay there. it would go down a little bit if i blip the gas pedal at a low rpm.the fuel pressure at idle is at 45-47 psi. i've checked to see if the fmu is working by blowing into the vacuum tube and fuel pressure jumps well over 140psi so i know for sure that the inline pump/fmu are working properly. well, aside from getting new injectors, i don't know what else to do. here's my setup to help you help me.
stock b18b
revhard mani
garret t3/to4 60trim
tial w/g (7psi)
3'' dp
spearco fmic
vortech t-rex 255lph inline pump
vortech 12:1 fmu
missing link
AEM adj, fpr
ngk bkr7e
msd6 BTM
stock injectors
stock timing
my engine is running really lean at all rpms and at all throttle position ranges.
the engine doesn't even see boost and it still runs REALLY lean. i've replaced the inline pump to a brand new vortech t-rex unit, new 12:1 fmu, new bkr7e-11's, new aem adj.fuel pressure regulator, new gsr intank fuel pump, and new fuel filter. after changing out all of these items, the engine will still run lean. i've pulled the plugs and they indicate that the engine was in fact, running lean. (white electrode ends)
when i'm driving, the afr would jump into the 14's for a bit and then run all the way up to 20 and stay there. it would go down a little bit if i blip the gas pedal at a low rpm.the fuel pressure at idle is at 45-47 psi. i've checked to see if the fmu is working by blowing into the vacuum tube and fuel pressure jumps well over 140psi so i know for sure that the inline pump/fmu are working properly. well, aside from getting new injectors, i don't know what else to do. here's my setup to help you help me.
stock b18b
revhard mani
garret t3/to4 60trim
tial w/g (7psi)
3'' dp
spearco fmic
vortech t-rex 255lph inline pump
vortech 12:1 fmu
missing link
AEM adj, fpr
ngk bkr7e
msd6 BTM
stock injectors
stock timing
Joined: Jul 2005
Posts: 97
Likes: 0
From: long beach, ca, usa
check your o2 sensors they are the ones that controll the fuel in the car. thats what happened to my car although its an audi turbo but same principle when it comes to the function of an o2 sensor. plus they are cheap
Thread Starter
Honda-Tech Member
Joined: Sep 2002
Posts: 241
Likes: 0
From: 808 State
sorry i couldn't reply any earlier....i just got home from work.
i am using a plx m-300 to monitor a/f ratios.
one of the mustang guys around here told me the exact same thing about the o2 sensor messing up and sending the wrong readings to the ecu, thus leaning out the injectors. I'll pick up another one first thing tomorrow morning and see if that does anything. thanks for the replies.
anyone else have a guess?
i am using a plx m-300 to monitor a/f ratios.
one of the mustang guys around here told me the exact same thing about the o2 sensor messing up and sending the wrong readings to the ecu, thus leaning out the injectors. I'll pick up another one first thing tomorrow morning and see if that does anything. thanks for the replies.
anyone else have a guess?
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