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2001 ford windstar has code PO401 erg insufficent flow.
An erg is a unit of energy in the cgs system. It is equal to 10-7 joule (that is, 0.1 microjoule or 100 nanojoule) - a very small unit.
It doesn't "do" anything. An erg is an old unit for energy, in the cgs system. The modern unit for energy is the joule. 1 joule is 10 million ergs.
An erg is an old-fashioned unit for energy (from the cgs system). Energy cannot be created or destroyed, but you can convert one type of energy into another type.
Nobody "discovered" it. It's a natural unit in the cgs system, since it's the simplest energy unit expressed in the base units of that system. In SI, it's deprecated in favor of the joule; 1 erg = 100 nJ.
The cgs power unit is the erg, a dyne-centimeter.
wats ERG?
The three methods for determining the appropriate guide pages in the Emergency Response Guidebook (ERG) are by the name of the material, the 4-digit UN identification number assigned to the material, and the type of event (e.g., fire, spill, leak) that is occurring.
An erg is a unit of energy equivalent to 10-7 Joules. It is also a dyne centimeter, which is probably the most common expression of an erg. And 6.2415 ×1011 eV (electron volts) is also an erg. A link is provided to the Wikipedia article on the erg.
back pressure from a plugged or partially plugged catalytic converter
That's EGR valve, not ERG, and it stands for Exhaust Gas Recirculator, which is not exclusive to the Ranger by any means. All modern cars have them. Exhaust gases are sent back into the intake to burn-off remaining unburnt gases.
as u lean over engine on right hand side under fuel filter block.