In , the new Ford DFR powered Ligier JS33 showed promise. Arnoux's driving had attracted some criticism, and he was frequently accused of not using his mirrors and blocking faster cars in qualifying and when being lapped. During the 1989 Monaco Grand Prix, BBC commentator Murray Walker remarked that Arnoux's claimed reason for going so slow at that stage of his career was that he was used to turbo powered cars and that the naturally aspirated cars were "a completely different kettle of fish to drive — he says". Walker's co-commentator, World Champion James Hunt said "And all I can say to that is bullshit". Arnoux received criticism after the race for holding up faster cars, with former Renault teammate Prost in particular held up by the Ligier which refused to let the McLaren past for a number of laps. This cost Prost some 20 seconds in his pursuit of teammate Ayrton Senna.