1996 Ford F-150 HARD START

JAMES REINHARDT

MEMBER
1996 FORD F-150
6 CYL
2WD
MANUAL
182,000 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.

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

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)