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#1
04-03-2004, 02:27 PM
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HELP!!! Running way too lean, losing power at full throttle
I have a brand new engine in my 1990 mustang and i am having problems with the car already. it is losing power at full throttle and the motor pings. it also running really really lean. i dont know what the prblem is except maybe that it is being caused form the speed density system. i have a bunch of mods on the car that include:cold air intake, 70mm throttle body upper and lower intakes by edelbrock, phenolic spacer, headers, exhaust, h pipe,. Does anyone know whats causing these problems and know if thay can be fixed by simply converting to mass air?
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#2
04-03-2004, 03:20 PM
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Well first things first what fuel pressure are you running at now?
You added a bunch of air intake/exhaust mods but did you upgrade your pump/injectors at all? How old is the fuel filter? Double check the timing as well.
__________________
92 Mustang GT, 347 Stroker(Forged Steel Crank/Rods-Balanced, Forged Alum Dished Pistons), B50 Block, Track Heat Intake, Twisted Wedge Heads w/ Stage 3 port/polish, 80mm C&L MAF, FMS 30# Inj., BBK AFPR, Trick Flow Stage 2 Cam, Trick Flow 1.6R Rockers, BBK EL-CC Headers, MAC O.R. H-Pipe, Flowmaster Cat-Back, Accufab 75mm TB, MAC CAI, BBK Pulleys, Griffin Alum Radiator, Mark 8 Fan, MSD Pro-Billet Distributor; AOD, Dynamic 3300 L-U Converter, B&M Trans Cooler; 3:73 gears.
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#3
04-03-2004, 05:05 PM
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Re: HELP!!! Running way too lean, losing power at full throttle
im running at 30 psi. the fuel filter is brand new. I did not upgrade the pump or the injectors. will that make it run more rich? and how about switching to the mass air? will that make it run more rich?
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#4
04-03-2004, 05:56 PM
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My first question needs to be why is your 90 Mustang running speed density and not MAF?
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R.I.P. Hypsi- Andy your one of the best people I ever had the priviledge to know. AF and the world has lost one of the truly wonderful people... 
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#5
04-03-2004, 06:01 PM
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Re: HELP!!! Running way too lean, losing power at full throttle
because the 90' is the year of the body and chasis. it used to be a 2.3 i have a 88' gt motor in it. thats why.
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#6
04-03-2004, 07:29 PM
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Re: HELP!!! Running way too lean, losing power at full throttle
my dads 96 bronco had the same problem, we replaced the fuel pump and it fixed it
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#7
04-04-2004, 07:10 PM
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Re: HELP!!! Running way too lean, losing power at full throttle
Speed density is less adaptable to mods than Mass Air but the mods you list seem OK. The 70mm TB seems a bit excessive if you are running stock heads but shouldn't be the cause of your lean condition.
Check for codes - KOEO and KOER - and see what you may be getting. How about timing - what's it set at? Too much advance will definitely cause pinging. My 5.0 used to like about 12 degrees - 10 degrees is factory. Don't forget to remove the spout connector when checking timing. Fuel pump or fuel pressure regulator may be problems, too. Did you check pressure while running? LOL
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