After it starts does it idle good before you step on the gas , will it keep idling before you step on the gas ? Is the check engine light on ? What engine does the vehicle have ? This vehicle came with 5.0 L ,5.7L ,6.5 L , 7.4 L engines ,gas or diesel ? Three specific data sensors provide the vehicle control module (VCM) with the basic information for the fuel management portion of its operation. Three specific signals to the VCM establish the engine speed and air density factors. The engine speed signal comes from the distributor high resolution circuit. The VCM uses this information to determine engine speed (RPM). Air density is derived from intake air temperature (IAT) and manifold absolute pressure (MAP) sensor inputs. The IAT sensor measures the air temperature that is entering the engine. The IAT signal works in conjunction with the MAP sensor to determine air density. As the intake manifold pressure increases, the air density in the intake manifold also increases and additional fuel is required. This information from the IAT and MAP sensors is used by the VCM to control injector pulse width. One of these sensors could be bad or a plugged catalytic converter .
Posted on Dec 27, 2014
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