8-VALVE 1.4
ENGINE
FIAT PUNTO TRAINING OUTLINE
Fiat Auto S.p.A.
After Sales Training
4.5.5 Cold operation
Under these conditions, the mixture becomes lean due to poor turbulence of fuel particles at
low temperatures, less evaporation, and heavy condensation on the inlet manifold inner walls.
All of this is enhanced by the greater viscosity of the lubricating oil which, as everyone knows,
increases, at low temperatures, the rolling resistance of the engine’s mechanic members.
The electronic control unit recognizes this condition based on the cooling fluid temperature
signal, and increases the injection base time.
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