2005 Ford Mustang V-6

[Chevelle_Nut]

Thinking about a 2005 Mustang V-6, may be able to get it cheap. Main reason is it won't pass inspection, MIL on. Owner bought a 2019 Mustang and doesn't need this one any more.

Here are the codes. I am thinking the evap system could be the cause, HEGO Codes like that are usually not an HEGO issue BUT the car does lose coolant so it could be a cracked plastic intake or head gasket (worst case). The car does run decently, will need exhaust work.


===PCM DTC P0172-FF===
Code: P0172 - System Too Rich Bank 1

Module: Powertrain Control Module

Diagnostic Trouble Code details

System Too Rich Bank 1

The PCM monitors the adaptive fuel table to ensure fuel control system components do not vary from their nominal values. The fuel control strategy within the PCM uses the adaptive fuel table to compensate for normal wear or aging of fuel control system components. The code is set when the PCM can no longer compensate for additional changes in the fuel system.

This DTC may be caused by :

Suspect air intake obstruction.

Suspect High fuel pressure.

Suspect HO2S11 circuit.

Suspect PCM.

Suspect EVAP EVAP canister purge solenoid.

Leaking exhaust system.

Blown HO2S heater fuse.

Exhaust System Test. This test requires the use of a vacuum gauge and tachometer. The vacuum gauge must be capable of reading %P. Using a vacuum gauge and tachometer, this test will determine if the exhaust system is restricted. NOTE: For no-start, disconnect the exhaust system.

Possible fault in cooling system

Check the vacuum hoses for cracks especially at the connections. For example a leak in the vacuum hose to the fuel pressure regulator will cause the fuel rail pressure to rise increasing the fuelling.

===END PCM DTC P0172-FF===

===PCM DTC P0174-FF===
Code: P0174 - System Too Lean Bank 2

Module: Powertrain Control Module

Diagnostic Trouble Code details

System Too Lean Bank 2

The PCM monitors the adaptive fuel table to ensure fuel control system components do not vary from their nominal values. The fuel control strategy within the PCM uses the adaptive fuel table to compensate for normal wear or aging of fuel control system components. The code is set when the PCM can no longer compensate for additional changes in the fuel system.

This DTC may be caused by :

Suspect Low fuel pressure.

Crankcase Ventilation System

Suspect air intake system leak.

Suspect engine vacuum leak.

Suspect HO2S21 circuit.

Suspect PCM.

A blocked fuel filter will restrict the flow of fuel to the pressure regulator. If the fuel supply to the fuel filter is O.K. the fuel filter may be blocked.

Obstructed or dirty fuel injector(s)

Suspect EVAP EVAP canister purge solenoid.

Leaking exhaust system.

===END PCM DTC P0174-FF===

===PCM DTC P0175-FF===
Code: P0175 - System Too Rich Bank 2

Module: Powertrain Control Module

Diagnostic Trouble Code details

System Too Rich Bank 2

The PCM monitors the adaptive fuel table to ensure fuel control system components do not vary from their nominal values. The fuel control strategy within the PCM uses the adaptive fuel table to compensate for normal wear or aging of fuel control system components. The code is set when the PCM can no longer compensate for additional changes in the fuel system.

This DTC may be caused by :

Suspect air intake obstruction.

Suspect High fuel pressure.

Suspect HO2S21 circuit.

Suspect PCM.

Suspect EVAP EVAP canister purge solenoid.

Leaking exhaust system.

Blown HO2S heater fuse.

Exhaust System Test. This test requires the use of a vacuum gauge and tachometer. The vacuum gauge must be capable of reading %P. Using a vacuum gauge and tachometer, this test will determine if the exhaust system is restricted. NOTE: For no-start, disconnect the exhaust system.

Possible fault in cooling system

Check the vacuum hoses for cracks especially at the connections. For example a leak in the vacuum hose to the fuel pressure regulator will cause the fuel rail pressure to rise increasing the fuelling.

===END PCM DTC P0175-FF===

===PCM DTC P0456-FF===
Code: P0456 - EVAP system leak detected (very small leak .02-inch)

Module: Powertrain Control Module

Diagnostic Trouble Code details

EVAP system leak detected (very small leak .02-inch)

Suspect loose fuel filler cap.

Suspect evaporative system vacuum or vapor hose leak.

This DTC may be caused by :

Poor connections

EVAP canister vent solenoid stuck open.

OR

For this system diagnostic tester must be used in conjunction with the workshop manual

EVAP System Leak Detection Pump

For this system diagnostic tester must be used in conjunction with the workshop manual

===END PCM DTC P0456-FF===

===OBDII DTC P0172-C===
Code: P0172 - System Too Rich Bank 1

Status (-43):
- Confirmed - malfunction is confirmed

Module: On Board Diagnostic II

Diagnostic Trouble Code details

System Too Rich Bank 1

The PCM monitors the adaptive fuel table to ensure fuel control system components do not vary from their nominal values. The fuel control strategy within the PCM uses the adaptive fuel table to compensate for normal wear or aging of fuel control system components. The code is set when the PCM can no longer compensate for additional changes in the fuel system.

This DTC may be caused by :

Suspect air intake obstruction.

Suspect High fuel pressure.

Suspect HO2S11 circuit.

Suspect PCM.

Suspect EVAP EVAP canister purge solenoid.

Leaking exhaust system.

Blown HO2S heater fuse.

Exhaust System Test. This test requires the use of a vacuum gauge and tachometer. The vacuum gauge must be capable of reading %P. Using a vacuum gauge and tachometer, this test will determine if the exhaust system is restricted. NOTE: For no-start, disconnect the exhaust system.

Possible fault in cooling system

Check the vacuum hoses for cracks especially at the connections. For example a leak in the vacuum hose to the fuel pressure regulator will cause the fuel rail pressure to rise increasing the fuelling.

===END OBDII DTC P0172-C===

===OBDII DTC P0174-C===
Code: P0174 - System Too Lean Bank 2

Status (-43):
- Confirmed - malfunction is confirmed

Module: On Board Diagnostic II

Diagnostic Trouble Code details

System Too Lean Bank 2

The PCM monitors the adaptive fuel table to ensure fuel control system components do not vary from their nominal values. The fuel control strategy within the PCM uses the adaptive fuel table to compensate for normal wear or aging of fuel control system components. The code is set when the PCM can no longer compensate for additional changes in the fuel system.

This DTC may be caused by :

Suspect Low fuel pressure.

Crankcase Ventilation System

Suspect air intake system leak.

Suspect engine vacuum leak.

Suspect HO2S21 circuit.

Suspect PCM.

A blocked fuel filter will restrict the flow of fuel to the pressure regulator. If the fuel supply to the fuel filter is O.K. the fuel filter may be blocked.

Obstructed or dirty fuel injector(s)

Suspect EVAP EVAP canister purge solenoid.

Leaking exhaust system.

===END OBDII DTC P0174-C===

 

[kmakar]

P0172 - System Too Rich Bank 1

Check the gas cap. My truck had the same issue (different code), but just by accident I was replacing the cap (had a locking gas cap) to a regular cap and the code went away. Put the locking one back on and code came back, swapped it to the new one again and code went away.

 

[Chevelle_Nut]

P0172 - System Too Rich Bank 1

Check the gas cap. My truck had the same issue (different code), but just by accident I was replacing the cap (had a locking gas cap) to a regular cap and the code went away. Put the locking one back on and code came back, swapped it to the new one again and code went away.

Lean and rich on all HEGOs, gas cap a possibility, could also be purge solenoid.

 

[SSuperDave]

The coolant leak is most likely the plastic thermostat housing, will leak under the intake and down the back of the engine. Its a cheap and easy fix, in the last 2 months , I've done both mine and my daighters on an '07 and '08. Those engines are very reliable, I've had three, and parts are cheap and available for just about everything. I've never seen a cracked intake or head gasket failure on them despite what some forums may tell you.
Gas cap and purge valve best guesses on the other. For a gas cap, spend a few extra bucks for a dealership one, the aftermarkets have issues.

 

[kmakar]

For a gas cap, spend a few extra bucks for a dealership one, the aftermarkets have issues.

That's what I learned. Bought one at OReilly's and had the same problem, so bought one from Ford and it's still on the truck with no more issues.

 

[Chevelle_Nut]

The coolant leak is most likely the plastic thermostat housing, will leak under the intake and down the back of the engine. Its a cheap and easy fix, in the last 2 months , I've done both mine and my daighters on an '07 and '08. Those engines are very reliable, I've had three, and parts are cheap and available for just about everything. I've never seen a cracked intake or head gasket failure on them despite what some forums may tell you.
Gas cap and purge valve best guesses on the other. For a gas cap, spend a few extra bucks for a dealership one, the aftermarkets have issues.

IDK if he is going to sell it or not, he says he bought it from a guy who did modifications to it. I am guessing a fuel delivery issue but the car is still in my back yard so he will have to do something with it.

 

[Chevelle_Nut]

Long story short about this car, kid wants to give it to me. I don't need it but I will make like I am accepting it, fix it and give it back to him.
The goal is to get it safe, reliable and pass inspection.

Battery was slap dead, I think that is his starting issue, will replace. Still have the codes to deal with, I am thinking the nasty K&N filter may be part of the problem, I hate K&N filters! Local scrap yard has an air box, can't hurt to go back stock. Exhaust is also wrong, going to get a stock system for it. Can you tell I hate modifications!

Surprisingly there is no chain slap, the 4.0L SOHC engines are a bear to fix, only way is to pull the engine.

There is a bad noise in the front suspension, will look at it too.

 

[kmakar]

Don't be surprised if after you fix it and give it back to him that he might give it to your daughter.

 

[Shovelrick]

Sounds like it needs an LS Transplant

 

[Chevelle_Nut]

Don't be surprised if after you fix it and give it back to him that he might give it to your daughter.

He may, who knows. That is one way to get her off my insurance

 

[SSuperDave]

The front suspension noise is going to be lower control arm bushings. I bought a kit off ebay for under $150 that had both lower control arm assy, inner and outer tie rod ends and sway bar links. Lower arms are bit time consuming due to have to remove the steering rack bolts and shift (not remove) the rack to access the control arm bolts.
We have constant problems with K&N filters causing driveaqbiltu issues,especially with diesels. A good Motorcraft paper filter, changes regularly, is all you need.
I've had three 4.0 Mustangs, two went past 200K miles, if maintaned, they are excellent cars, chap and easy to fix.

 

[Chevelle_Nut]

The front suspension noise is going to be lower control arm bushings. I bought a kit off ebay for under $150 that had both lower control arm assy, inner and outer tie rod ends and sway bar links. Lower arms are bit time consuming due to have to remove the steering rack bolts and shift (not remove) the rack to access the control arm bolts.
We have constant problems with K&N filters causing driveaqbiltu issues,especially with diesels. A good Motorcraft paper filter, changes regularly, is all you need.
I've had three 4.0 Mustangs, two went past 200K miles, if maintaned, they are excellent cars, chap and easy to fix.

I am fighting a P0172 error, P0175 was a stored code as was P0171 and P0174. I cleaned the MAF sensor / Throttle body, it was dirty. I am hearing an exhaust leak on the left bank, I have yet to lift the car up and climb under it. I am pretty sure it is not O2 Sensors, all seem to be reading properly, I am seeing a higher fuel pressure on Bank 1, thinking that is the P0172 error.

Thanks for the info on the front end, I will check it out.

 

[SSuperDave]

Look for a leaking fuel pressure regulator on the fuel rail., and a bad coolant temp sensor, located in the t-stat housing under the throttle body, or a sticking t-stat. Buy the entire housing, a metal one if you can source it, the plastic ones crack. In 5 years, I had three of them on my son's '07. Also vacuum leaks. I'd suspect all of these before an O2 sensor.

 

[Chevelle_Nut]

Look for a leaking fuel pressure regulator on the fuel rail., and a bad coolant temp sensor, located in the t-stat housing under the throttle body, or a sticking t-stat. Buy the entire housing, a metal one if you can source it, the plastic ones crack. In 5 years, I had three of them on my son's '07. Also vacuum leaks. I'd suspect all of these before an O2 sensor.

It has a coolant loss, haven't found it yet but I am suspect of the thermostat housing. Fuel pressure regulator makes sense. Right side exhaust is more uneven than left.

 

[SSuperDave]

Look under the intake, there will probably be coolant in the valley. For visible leaks, it runs out and down the back and makes you suspect the firewall heater hoses at first. Initially, it may only leak when fully hot, but as the crack opens up, it gets worse til the housing will finally split. Also, these cars are hard to burp all the air out of the cooling system once repaired

 

[Chevelle_Nut]

Look under the intake, there will probably be coolant in the valley. For visible leaks, it runs out and down the back and makes you suspect the firewall heater hoses at first. Initially, it may only leak when fully hot, but as the crack opens up, it gets worse til the housing will finally split. Also, these cars are hard to burp all the air out of the cooling system once repaired

Seems to be the way with newer cars, my Fusions are a bear to burp air out of the system

 

[Chevelle_Nut]

Look under the intake, there will probably be coolant in the valley. For visible leaks, it runs out and down the back and makes you suspect the firewall heater hoses at first. Initially, it may only leak when fully hot, but as the crack opens up, it gets worse til the housing will finally split. Also, these cars are hard to burp all the air out of the cooling system once repaired

Coolant leak under the car, looks like either the lower radiator hose or radiator.

 

[SSuperDave]

Radiators are common leak points on these as well, usually the lower corner on the driver side.

 

[Shovelrick]

Making me want a Mustang just to do an LS swap a good friend had 5 but now down to 4, oldest is a 91 with NOS, newest is '16 GT he bought new then added a Roush SC, 2 with NOS, 2 with SC but I forgot the other years

 

[Chevelle_Nut]

Radiators are common leak points on these as well, usually the lower corner on the driver side.

Yup, that it where it is.