Officers were patrolling West Smethwick Park on Tuesday (13 May) when they spotted the vehicle in the car park.
The two occupants were detained for a stop and search and police recovered a quantity of class A drugs.
Two 40-year-old men were arrested on suspicion of possession with intent to supply. They both remain in custody for questioning.
A spokesperson for West Midlands Police said: “Stop and search powers help us to tackle crime. It’s targeted and intelligence-led and practised on people who are suspected of being involved in crime.”