Mechanics

F150 HARD START

1996 Ford F-150

Engine Performance problem
1996 Ford F150 6 cyl Two Wheel Drive Manual 182000 miles

WHEN ENGINE IS HOT IT IS HARD TO START, ACTS LIKE ITS ON 4 CYLS. JUST SHIMMIES AND SHAKES REAL BAD. IT WILL FINALLY CATCH UP AND RUN OK. HAVE REPLACED TEMP SENSER, PLUGS, WIRES, DIST. CAP AND ROTOR BUTTON. I GET A LEAN BANK 1 AND BANK 2 CODE. CANNOT FIND ANY VACCUM LEAKS. HAD IT CHECKED WITH A GENISIS ANALYZER, MECH SAID EVERYTHING WAS WORKING. I'M STUMPED. ANY HELP GREATLY APPRECIATED.
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JAMES REINHARDT
February 26, 2009.



I GET A LEAN BANK 1 AND BANK 2 CODE

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)

Rasmataz
Feb 26, 2009.