[Grammar] when he arrived/ had arrived

[Iryn_]

Hello, everybody!

1. Tim left when Bob arrived.
2. Tim left when Bob had arrived.

So, the meaning of the 1st sentence is that Tim waited until Bob arrived, and once Bob arrived, Tim left.
Is the meaning of the 2nd one any different?

 

[Matthew Wai]

1. Tim left immediately after Bob arrived.
2. Tim left sometime after Bob arrived.