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Old 05-20-2011, 02:35 AM
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4.6 liter mystery codes

i have a 96 thunderbird and i have codes p0171 bank 1 too lean p0172 bank 1 too rich p0174 bank 2 too lean p0175 bank 2 too rich and p0304 number 4 cylinder missfire can some one please give me a lil insight on this

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Old 05-20-2011, 05:13 AM
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Just came through 10 years of Supercharged 4.6 and 5.4 Ford Mod Motors.
Whenever the dreaded Lean Bank Codes come up it's usually a 02 Sensor or Dirty / Troubled MAF. The fact yours is showing Lean & Rich is a little weird though ???

Have you added Headers recently ? Sometimes a melted 02 Sensor "Harness Extension" can drive you crazy (for example on Lightnings they seem to always melt near the headers)

As for the misfire code that usually points to a bad or weak Coil
(can also be a ***** to find because sometimes with COP the bad one will only act up under load or certain conditions) *In your case you can swap coils and see if the code moves to the other cylinder.

And of course the most obvious place to start would be dirty Injectors or Fuel Filter

GOOD LUCK...
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Old 05-20-2011, 11:13 AM
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4.6 liter mystery

no headers all stock but thank u for your insight
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Old 05-20-2011, 11:48 AM
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What were the conditions before the car threw codes? I've had similar codes happen after simply washing the engine, the plugs are very prone to fouling because of their vertical orientation and no way to keep water out. How is it running? Is the engine actually misfiring?

In a 96 you don't have to worry about COP, as your vehicle has the coil packs located at the front of the engine at each side in banks of four. They're surprisingly durable, especially in comparison with the COP units.
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Old 05-20-2011, 02:13 PM
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4.6 liter mystery

well when it gets cold out or rainy or even if i put on the air or heater it stumbles and dont want to run right and also the amp guage falls and the alternator squeels but if you have everything off and its nice outside it will run ok but it has an exhuast rattle between 1500 to 2500 rpm when you want to accelerate quickly and it will also stall i also smell gas out of the exhuast and it does miss
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Old 05-20-2011, 02:40 PM
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If you haven't given it a tune up in sometime, I would honestly start there. If your basic ignition components aren't functioning properly, its going to cause a host of symptons that can confuse the ecm.
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Old 05-20-2011, 07:11 PM
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The P0304 is the root cause of the other codes . Misfiring and excessive fueling, repair the P0304 and the others will clear up. Pull plug on cyl # 4 and red it. Probably gonna be black from the sound of it. The injector ground circuit could be shorted to ground wich would fuel excessively and cause a misfire and cause a rich condition forcing trims to go lean and swinging back and forth like a barn door in a tornado.
The coil may also be bad, so you will need to ohm out some stuff and do some basic inspection to start. Look at the coil and ohm it out.Ohm the injector (compare it to another for reference ) and check/change the plug.
Keep us posted
(also do what Valkylerie said)
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Old 05-20-2011, 07:21 PM
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4.6 liter mystery codes

now i have changed the fuel filter about a month ago thinking that was the problem but it did help a lil bit didnt change any codes but also the original owner had said that he put in roush racing plugs and wires on it if they are what should i look for on them and if they are ford racing wouldnt they have the emblem on them but when i looked at them they dont look new they look like they came with the car
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Old 05-20-2011, 07:30 PM
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Do what Valkylrie said. Change the plugs and wires. Anytime I have codes like what you have It gets a tune up before I go any farther. No sense letting basic maintenance stuff muddy the water.
Use platinum or double platinum plugs(autolite or motorcraft) and put on new wires.
When you put the wires on apply dielectric grease to the two ribs of the boot on the plug end of the wire as this will help keep water out and prevent future issues.
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Old 05-20-2011, 07:40 PM
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You can check the fuel rail pressure to see if it holds for a while as it should of if a sticking injector is allowing the fuel to bleed out through it into the cylinder(s).
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Old 05-20-2011, 08:22 PM
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4.6 liter mystery codes

now if you have the engine off and you tun the key the fuel pressure is at about 31 psi and when the engine is running it is still only 28 to 31 psi so does that sound like a bad injector or some thing else
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Old 05-20-2011, 08:35 PM
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Quote:
Originally Posted by 1996thunderchicken
now if you have the engine off and you tun the key the fuel pressure is at about 31 psi and when the engine is running it is still only 28 to 31 psi so does that sound like a bad injector or some thing else
While the pump is operating, the pressure will remain up. It's how quickly pressure is lost after the pump is turned off that is of concern. This wouldn't positively point to a sticking injector, but would at least point to there being a problem, and combined w/the symptoms you're having, could point to a faulty injector.
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Old 05-20-2011, 09:25 PM
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4.6 liter mystery codes

k thank you guys for the help i have an ohm meter and i will check every thing i will keep you posted on what i find out i hope its something simple like an injector and i cant thank you guys enough for your help thank you
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Old 05-20-2011, 11:00 PM
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Even so this may not be of help, check it for vacuum leaks. Many times on Ford 4.6`s the vacuum hose will split on the bottom side where you can`t see it. Also check the section that plugs directly into the pcv valve.
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Old 05-21-2011, 12:04 AM
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4.6 liter mystery codes

i did have to replace 2 vacume lines and the others are getting ragged the ones i replaced were the ones on the back of the throttle body that leads up front on the passenger side so basically a good tune up and vacume hoses k got it and thanks again
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