Opel Speedster Operation, Safety, Maintenance Manual page 27

Engine and load compartment cover
release
The engine cover release lever is located
behind the drivers seat. To open the engine
cover, pull the lever forwards. The engine
cover will then be unlocked and will partially
open - return release lever to its original
position.
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To hold the cover in the open position, insert
the support rod into the slot provided in the
underside of the engine cover.
Before closing the cover, press the support
rod firmly into its retainer. Lower cover gently
and then allow it to fall under its own weight.
Press firmly down centrally in the area of its
latch to ensure it is fully closed.