The heavy and ultimately unreliable (in Lotus usage at least; the Larrouse-Lola outfit found better results having used the engine since 1989) Lamborghini engine was replaced by the Judd EV V8, the successor of the Judd CV V8 that had been used in the 101 in 1989. The driver line-up was also changed. Martin Donnelly stated that he was due to be kept on for 1991 as lead driver, but his Jerez shunt put paid to that. Future world champion Mika Häkkinen and Julian Bailey filled the seats vacated by a frustrated Derek Warwick and injured Donnelly. It was apparent that the car was nowhere near the pace setters of the &lt;a href="McLaren%20MP4/6"&gt;McLaren MP4/6&lt;/a&gt; and the Williams FW14 at the opening round in Phoenix. The quality control was still not up to standard; Häkkinen would go on to describe that during this race his steering wheel actually came off. Bailey's failure to qualify for the Monaco Grand Prix prompted his departure and replacement with test driver Johnny Herbert for the remainder of the season. Due to Herbert's International Formula 3000 commitments the German driver Michael Bartels raced in his absence but failed to qualify.