2006 Ford Fusion Seeking advice/help

[Toddinlou]

Need car advice on the G/F's car

Occasionally runs rough, shifts rough,and CEL

2006 Ford Fusion
Code: P0171
My scanner shows that when the car is running rough and fuel trims are way out of spec. My thought is vacuum leak and the car is getting unmetered air after the MAF. Any mechanics have any advice or free time to check it out?


---------------------------------------------
Freeze Frame Report
---------------------------------------------
Date: 11/11/2012 4:14:05 PM

PID Description Value Units
--- ----------- ---- -----
0x02 Freeze frame DTC P0171 -
0x01 Number of trouble codes, MIL indicator on/off, and available onboard tests MIL Off, # Trouble Codes 0, Misfire: Available = True, Complete = True
Fuel System: Available = True, Complete = True
Components: Available = True, Complete = True
Catalyst: Available = True, Complete = True
Heated Catalyst: Available = False, Complete = False
Evap System: Available = True, Complete = True
Secondary Air System: Available = False, Complete = False
AC Refrigerant: Available = False, Complete = False
Oxygen Sensor: Available = True, Complete = True
Oxygen Sensor Heater: Available = True, Complete = True
EGR System: Available = True, Complete = True
-
0x03 Fuel system status Closed-loop, using oxygen sensor feedback to determine fuel mix -
0x04 Calculated load value 38.82 %
0x05 Engine coolant temperature 194 F
0x06 Short term fuel % trim - Bank 1 7.03 %
0x07 Long term fuel % trim - Bank 1 27.34 %
0x0B Intake manifold absolute pressure 5.95 PSI
0x0C Engine RPM 692.5 RPM
0x0D Vehicle speed 0 MPH
0x0E Ignition timing advance for #1 cylinder 1.5
0x0F Intake air temperature 96.8 F
0x10 Mass air flow rate 0.4 lb/min
0x11 Absolute throttle position 13.33 %
0x14 Oxygen sensor voltage, Short term fuel trim (Bank 1, Sensor 1) 0.26 V (7.03 % Trim)
0x15 Oxygen sensor voltage, Short term fuel trim (Bank 1, Sensor 2) 0.14 -
0x1F Time since engine start 135 sec
0x2C Commanded EGR 0.78 %
0x2E Commanded evaporative purge 0 %
0x2F Fuel level input 60.39 %
0x30 Number of warm-ups since DTCs cleared 199
0x31 Distance traveled since DTCs cleared 3845.04 miles
0x32 Evap system vapor pressure 1.18 PSI
0x33 Barometric pressure 14.36 PSI
0x3C Catalyst temperature (Bank 1 Sensor 1) 983.66 F
0x41 Monitor status this driving cycle Misfire: Available = True, Complete = True
Fuel System: Available = True, Complete = True
Components: Available = True, Complete = False
Catalyst: Available = True, Complete = False
Heated Catalyst: Available = False, Complete = False
Evap System: Available = False, Complete = False
Secondary Air System: Available = False, Complete = False
AC Refrigerant: Available = False, Complete = False
Oxygen Sensor: Available = True, Complete = False
Oxygen Sensor Heater: Available = True, Complete = False
EGR System: Available = True, Complete = False
-
0x42 Control module voltage 13.86 V
0x43 Absolute load value 20.39 %
0x44 Fuel/Air commanded equivalence ratio 1
0x45 Relative throttle position 1.57 %
0x46 Ambient air temperature 60.8 F
0x47 Absolute throttle position B 14.9 %
0x49 Accelerator pedal position D 19.22 %
0x4A Accelerator pedal position E 30.2 %
0x4B Accelerator pedal position F 19.22 %
0x4C Commanded throttle actuator control 2.75 %


Thanks!

[jmeister]

2.3 or 3.0?

[Toddinlou]

2.3

[Bama]

Generic lean code. Vacuum leak for sure, can't pinpoint as I work on exotic euro cars all day, but easy way if you don't have a smoke machine is to use brake clean and while engine is running, spray along vacuum lines and intake manifold flanges, if idle changes, you have found suspect area for vacuum leak. Be careful, if you have an issue with spark jumping for coils or wires and you spray brake clean, have fire extinguisher ready....don't ask how I know! Also clean MAF just for shitsngiggles.
If nothing is found, check to see if O2 sensors are switching equally and one isn't staying the same voltage.

[Toddinlou]

Question about brake cleaner... Will it damage the vacuum lines (damage the rubber hoses)?

[Toddinlou]

Question about brake cleaner... Will it damage the vacuum lines (damage the rubber hoses)?

[WLJ]

Question about brake cleaner... Will it damage the vacuum lines (damage the rubber hoses)?

Evaporates too fast to do any real harm.
Used to use a spray can of starting fluid for carburetors way back for that. Do they even make it any more?

[Joe]

Check crankcase ventilation as ford has trouble with these hoses

[jmeister]

Check crankcase ventilation as ford has trouble with these hoses

I was thinking the same thing, around the PCV valve. Also I know on the Mazda 3 with this engine that the purge solenoid goes bad and causes similar issues as well. Fighting with that on mine.

[Toddinlou]

Took the car to the shop.... A shop that will remain unnamed as it's not one I would ever choose. Anyway they checked the car out and said they could not locate any vacuum leaks and they "think" it's the MAF sensor. They wanted $300 and they weren't sure it was really the problem. I've found MAF sensors in the $40 range and it looks simple enough to drop in.

[Bama]

Should be easy to replace the maf - 30 minutes or less as long as you have the correct tools. Could be held in with a torx or tamper torx bolts.

[Joe]

I have been know to use carb cleaner to clean a MAF sensor and has worked not everytime but some. Cheap enough to try. The shop was right if it anint acting up it can be hard to find.

[Niceguy]

Took the car to the shop.... A shop that will remain unnamed as it's not one I would ever choose. Anyway they checked the car out and said they could not locate any vacuum leaks and they "think" it's the MAF sensor. They wanted $300 and they weren't sure it was really the problem. I've found MAF sensors in the $40 range and it looks simple enough to drop in.

They make spray MAF cleaner. It works for a while most of the time. Usually temporary but never know how temporary. It may be weeks, it may be 6 months. Worth a try for sure. Also a very easy replacement on most vehicles.

[Laurino]

I've seen the intakes crack (plastic) and the throttle bodies start leaking. Those also have a vent tube that runs to the under side of the intake manifold I believe. I've always used throttle body cleaner, it idles up if a leak is present.

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[Toddinlou]

I checked all the hoses and intakes with carb cleaner and all was good. Picked up a MAF at a junk yard today. Seems to be running better and I figure the long term fuel trim will take a few drive cycles to relearn.