Mechanics

F150 COLD ACCELLERATION HESITATION

2003 Ford F-150

Engine Performance problem
2003 Ford F150 V8 Two Wheel Drive Automatic

My truck is hesitating after starting. I have found that it will start up, then will not keep a low idol until two or three starts. The truck starts fine. When I pull away after that it hesitates on low accelleration. This only happens for the first few minutes of running from stop to start (after several light signals. The truck has 140+ miles but is well maintained.
I have had the spark plugs, igintions coils, spark plus wires, and main computer checked. I also have rescently had the transmission fluid and gas filter changed. I am still having the problem. What should I do?
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Sjohnson755
March 20, 2009.



Dirty IACV
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include: Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires

Rasmataz
Mar 20, 2009.