  The pyrochlore Eu$_2$Ir$_2$O$_7$ has recently attracted significant attention
as a candidate Weyl semimetal. The previous reports on this compound
unanimously show a thermally induced metal to insulator (MI) transition,
concomitant with antiferromagnetic (AFM) long-range ordering of the Ir-moments
below T$_\textit{N} \sim $120 K. However, there are contradictory reports
concerning the slope d$\rho/$dT of the resistivity plots ($\rho$) in the
"metallic" state above the metal-insulator (MI) transition, and the value of
$\rho$ in the insulating state, both of which show significant sample
dependence. Here, we explore this issue by investigating six different
Eu$_2$Ir$_2$O$_7$ samples with slightly varying Eu:Ir ratio. High-resolution
synchrotron powder diffraction are done to probe minor variations in the cell
parameters of the various Eu$_2$Ir$_2$O$_7$ samples investigated here. Specific
heat (C$ _p $) and magnetic susceptibility of all the samples showed long-range
antiferromagnetic ordering upon cooling below T$ _\textit{N} \sim $120 K. The
transitions are, however, found to be smeared out for the off-stoichiometric
samples. We show that the sign of d$\rho/$dT above the metal-insulator (MI)
transition is highly sensitive to the unit cell length, which, in turn, depends
on the level of Eu-stuffing at the Ir-site. Samples with composition close to
the ideal stoichiometry (Eu : Ir $ = $ 1) showed a change of sign of d$\rho/$dT
from negative to positive upon cooling below a certain temperature T $^*$ $>$
T$_\textit{MI}$. With increasing Eu-stuffing T$ ^* $ decreased until a negative
d$\rho/$dT persisted without any sign change down to T$_\textit{MI}$.
