it is located under the dash on the passenger side
on a 91 blazer s10 4wd
It'll fit, but it won't work. The 94 transmission is electronic, and interfaces with the ECM. It won't be compatible with the 91 in that regard.
any first gen s10 0r blazer or bervada grills will fit
The engine control module is located under the dashboard, on the passenger side, near the heater core. You will see a clip with one hex screw on it, leading up inside the dash.
check your wires underneat that run back to rear of vehicle, sometimes when the both mounts rust through the body come down on the wires and grounds them out
This can be done, though some modifications may be needed. If you need to replace your core support (rad support) as well, order a core support for a 91 S10 blazer. This will help do away with the mounting issues. I did this to a 1985 S10 blazer and the grill fit fine with the factory core support, but not all of the mounting locations matched.
On the drivers side of the throttle body.
It is behind the throttle body, on the intake manifold.
To drain the oil on a 1991 Chevy S10 Blazer, located the oil pan drain plug. Use a wrench to remove the plug and the oil will flow into the receptacle you have provided.
I have always used 10w30. never had any problems.
Neither, I believe it's electric.
It is located under the AC and Heat instrument panel