Multiple Codes Need Help

97ponygt · Feb 21, 2013

Well had to put my Mustang in storage for a year and a half and wasn't able to drive her around, extenuating circumstances didn't allow for it. So I took her out of storage and now she pulls three new codes. I've sprayed carb spray on all my vacuum hoses twice and didn't notice anything. And once at a stop light it died when putting the defrost on. Those three codes and possible fixes I'm come up with are:

P0300 - Random Misfire Detected

Spark Plugs
Spark Plug Wires
Ignition Coil Pack
Fuel Filter

P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean
This is the drivers side upstream O2 correct? Possibly dirty fuel injectors or filter?

P0151 - Oxygen 02 Sensor Circuit Low Voltage (Bank 2, Sensor 1)
Replace O2 drivers side 02 sensor. Probably going to switch them and see if the code follows.

and the one I've always had is P1443.

Any help is greatly appreciated guys. She's a 4.6L 2V with Auto transmission. And she hasn't gotten much worse gas mileage then normal so not sure where to start next. If I'm going to have to start throwing parts at her, what should I start with? I figured I should do plugs, plug wires and a fuel filter anyway since it's about time those things were replaced anyway.

97ponygt · Feb 24, 2013

97ponygt said:
Well had to put my Mustang in storage for a year and a half and wasn't able to drive her around, extenuating circumstances didn't allow for it. So I took her out of storage and now she pulls three new codes. I've sprayed carb spray on all my vacuum hoses twice and didn't notice anything. And once at a stop light it died when putting the defrost on. Those three codes and possible fixes I'm come up with are:

P0300 - Random Misfire Detected

Spark Plugs

Spark Plug Wires

Ignition Coil Pack

Fuel Filter

P1151 - Lack of HO2S-21 Switch, Sensor Indicates Lean
This is the drivers side upstream O2 correct? Possibly dirty fuel injectors or filter?

P0151 - Oxygen 02 Sensor Circuit Low Voltage (Bank 2, Sensor 1)
Replace O2 drivers side 02 sensor. Probably going to switch them and see if the code follows.

and the one I've always had is P1443.

Any help is greatly appreciated guys. She's a 4.6L 2V with Auto transmission. And she hasn't gotten much worse gas mileage then normal so not sure where to start next. If I'm going to have to start throwing parts at her, what should I start with? I figured I should do plugs, plug wires and a fuel filter anyway since it's about time those things were replaced anyway.

Nobody?

RichV · Feb 24, 2013

Well your fuel is probably crap, so I'd run out the bad fuel before you go throwing any parts. If the fuel has turned into varnish, probably not in that time, it will clog injectors like nobody's business.

I'm sure someone can recommend a good fuel system cleaner, and swap out the fuel filter at minimum. You may be replacing injectors if they're sticking.

32vNomad · Feb 24, 2013

97ponygt · Mar 1, 2013

Well your fuel is probably crap, so I'd run out the bad fuel before you go throwing any parts. If the fuel has turned into varnish, probably not in that time, it will clog injectors like nobody's business.

I'm sure someone can recommend a good fuel system cleaner, and swap out the fuel filter at minimum. You may be replacing injectors if they're sticking.

Yeah I emptied the bad fuel out before starting to drive her around and put seafoam in my first tank of gas.

When was the last time the O2's were changed?

I haven't for the life of the car and have had an off road H pipe for the last 50,000 miles. She has 131,000 on her right now.

32vNomad · Mar 5, 2013

97ponygt said:
Yeah I emptied the bad fuel out before starting to drive her around and put seafoam in my first tank of gas.

I haven't for the life of the car and have had an off road H pipe for the last 50,000 miles. She has 131,000 on her right now.

MustangChris · Mar 5, 2013

you have an off road pipe? do you have MIL eliminators and/or the rear o2s turned off in the tune?

Ninety8stang · Mar 11, 2013

You should always throw a new fuel filter in it if the car has been sitting for a while. Do a basic tune up on the car and see how it goes. My guess is theres gunk in that filter but i would also change the plugs as well. Shouldnt take longer than an hour and a half or so.