The incident happened last month in Lodge Lane
The suspects, who are aged 23 and 24 and from Bedfordshire, are in police custody after they were detained on suspicion of robbery.
The alleged incident happened in Lodge Lane on Sunday, 17 May.
A man and woman had driven there at around 10.30pm for a pre-arranged meeting. But, when they arrived, a man got into their car and threatened the man.
In a statement, Essex Police said: “We are continuing to progress our investigation and anyone with information who has yet to come forward is asked to call Grays CID on 101 quoting reference 42/70276/20 or report online at www.essex.police.uk.Grays, Thurrock
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