1998 Ford F-150 cylinder misfire

Tiny
BLAKETB
  • MEMBER
  • 1998 FORD F-150
  • 6 CYL
  • 4WD
  • MANUAL
  • 115,000 MILES
I JUST HAD MY SPARK PLUGS AND WIRES CHANGED ABOUT A WEEK AGO. MY CHECK ENGINE LIGHT IS STILL ON, SO I HAD A COMPUTER HOOKED UP TO IT AND IT SAID THE FUEL SYSTEM FOR BANK 1 WAS TO LEAN. CODE (PO171) AND ALSO A MALFUNCTION EXISTS IN THE ELECTRICAL CIRCUIT FOR THE FUEL COMSUMPTION SENSOR. CODE (PO176) AND THAT A MISFIRE HAS OCCURRED IN CYLINDER #2. CODE (PO302) WHAT DO THESE MEAN AND WILL GETTING THIS FIXED "COST ME AN ARM AND A LEG" IN LABOR?
Do you
have the same problem?
Yes
No
Friday, January 25th, 2008 AT 8:42 PM

1 Reply

Tiny
RASMATAZ
  • MEMBER
P0171

A lean fuel condition can be caused by:

* Low fuel pressure due to a weak pump or leaky fuel pressure regulator. (Use a fuel pressure gauge to check fuel pressure at idle)

* Dirty fuel injectors. (Try cleaning the injectors)

* Vacuum leaks at the intake manifold, vacuum hose connections or throttle body. (Use a vacuum gauge to check for low intake vacuum)

* Leaky EGR valve. (Check operation of EGR valve)

* Leaky PCV Valve or hose. (Check valve and hose connections)

* Dirty or defective Mass Airflow Sensor (MAF). (Try cleaning the MAF sensor wires or filament with aerosol electronics cleaner. Do NOT use anything else to clean the sensor, and do not touch the sensor wires)

* TIP: On many Fords, a P0171 and/or P0174 Lean Code may sometimes appear because of a bad Differential Pressure Sensor (DPFE). This sensor monitors EGR flow, and is located on the engine near the EGR valve. There are two hoses that connect the sensor to the tube that runs from the exhaust manifold to the EGR valve. The sensor misreads EGR flow and the computer increases EGR which has a leaning effect on the fuel mixture. The fix is to replace the DPFE sensor.

P0302

A misfire in a specific cylinder should lead you to check the spark plug, fuel injector and compression.

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.
Was this
answer
helpful?
Yes
No
Friday, January 25th, 2008 AT 9:29 PM

Please login or register to post a reply.

Recommended Guides