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Ford Mustang Forums Tech Related Engine & Performance 4.6 Modular Guys

running lean under load

medrick 18.09.2014, 04:52
My car is running really lean if i get into it. I can watch my wideband go from mid 14's to pegged at 19.9 and it sounds like its cutting out. It also goes really rich when i let off the throttle all the way down to 10.0. What could cause this? It's an 01 GT
lxhatch302 18.09.2014, 05:12
what mods do you have done too it?
medrick 18.09.2014, 05:40
Bbk long tubes and off road mid pipe
sct livewire-canned tune
dragon 75mm throttle body
75mm professional products intake plenum
accel cop's
ngk iridium plugs

and i unplugged my cop's 1 at a time to check and make sure they were all working (same with injectors) but this is at idle of course
lxhatch302 18.09.2014, 06:11
Did u try and gap those plugs?
medrick 18.09.2014, 07:16
no but its been running great for a month or 2 since i put them in with great air/fuel numbers (14.0-15.0 throughout the whole power band) and all of the sudden it just started acting all kinds of weird.
Tims2002GT 18.09.2014, 11:29
Can you datalog and see what your fuel pressure is? Might be the fuel rail pressure sensor and/or fuel pump.
medrick 18.09.2014, 11:54
Can you datalog and see what your fuel pressure is? Might be the fuel rail pressure sensor and/or fuel pump.

not since my livewire got stolen. fuel rail pressure sensor huh. is that the grey plug on the driver side fuel rail im guessin?
Tims2002GT 18.09.2014, 11:56
Yeah, it is in the middle of the fuel rail. 2 small bolts hold it on. I have an extra if you want to try it to see if it fixes your problem.
Bite Me 19.09.2014, 00:33
Didnt you modify your fuel pump also recently? Could be there?
lxhatch302 19.09.2014, 02:49
yah i forgot all about that damn fprs...it could be that if it was running good before hand and now ran like crap and also be the fuel pump going south
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