The ornamental design for an engineairintaketestingdevice, as shown and described.
FIG. 1 is a front perspective view from above of the engine air intake testing device according to the present invention;
FIG. 2 is a rear perspective view from above;
FIG. 3 is a front view;
FIG. 4 is a rear view;
FIG. 5 is a view from a first side;
FIG. 6 is a view from a second side;
FIG. 7 is a plan view; and,
FIG. 8 is an underneath view.
The features shown in broken line, including, but not limited to, the taps and valves, are for illustrative purposes only and form no part of the claimed design.