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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
oh and i checked all my cop's and injectors at idle by unplugging them each 1 at a time.
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havnt done anything recently except mess around in the fuel tank cause i had a filler neck gasket break off inside.
mods are:
long tubes and off road mid pipe
sct livewire with can tune
24lb injectors and maf from a 98 cobra (livewire has an option for the 24's)
75mm throttle body and plenum
accel cop's
ngk iridiums
+1 on checking fuel pressure. However, check it with a mechanical gauge under WOT going down the road and compare it to what the pcm is reading.
Also, just curious, when was the last time you changed your fuel filter? Thats usually the first thing I do before even attempting to diagnose a fuel issue.
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Just a slow, 8 year old 100,000 mile mustang.
havnt done anything recently except mess around in the fuel tank cause i had a filler neck gasket break off inside.
mods are:
long tubes and off road mid pipe
sct livewire with can tune
24lb injectors and maf from a 98 cobra (livewire has an option for the 24's)
75mm throttle body and plenum
accel cop's
ngk iridiums
How confident are you in the WB O2 system? My vote is that it's packing you full of crap--if you are really running 19.9:1 at WOT you'd be needing an engine after the 1st dyno pull...
Mix and match injectors and MAFs are a recipe for problems--did the Livewire let you select the '98 Cobra MAF too?
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-cliff knight- My Mustang
2003 GT, UPR X, Magnaflow, 180° stat,
PP 70mm TB & plenum, Sniper tuned
3.73s, 262 rwHP/305 ft.lb.
Multi-fuel: burns gas and rubber...
recently on the fuel filter. would pulling out one of my o2 sensors (one of the 2nd set that are turned off with the programmer) cause any problems? I wouldnt think so but just trying to figure it out. how would i check fuel pressure? where do I tap in? as far as i know the wideband is accurate.
if you are really running 19.9:1 at WOT you'd be needing an engine after the 1st dyno pull...
Actually you'd probably be fine. The car won't normally run above about 18:1 due to spark blow out. If you are really seeing 20:1 at WOT your wideband sensor is shot, or you have butchered the free air "calibration" if you have that type of WO2.
Actually you'd probably be fine. The car won't normally run above about 18:1 due to spark blow out.
Why would an excessively lean mix cause the spark to "blow out"? I agree that at 20:1 it probably wouldn't light up, however the plug will still spark.
My point was that along the way from 14.7:1 to 19.9:1, at WOT, there would be some bad things happening.
Quote:
If you are really seeing 20:1 at WOT your wideband sensor is shot, or you have butchered the free air "calibration" if you have that type of WO2.
I agree 110%, the AFR cannot actually be 19.9:1 at WOT and the engine still be running, let alone producing any power...
__________________
-cliff knight- My Mustang
2003 GT, UPR X, Magnaflow, 180° stat,
PP 70mm TB & plenum, Sniper tuned
3.73s, 262 rwHP/305 ft.lb.
Multi-fuel: burns gas and rubber...
Why would an excessively lean mix cause the spark to "blow out"? I agree that at 20:1 it probably wouldn't light up, however the plug will still spark.
Well, maybe blow out is the wrong term, but a lean mixture can require a higher voltage to fire the plug, as well as the increased chance the flame front will die out.
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running lean under load
