While an issue during the second session was initially thought to be MGU-K related, many still fearing that the Australian is on the verge of a grid penalty following the Monaco failure, it turned out to be an electrical issue related to the Renault engine update.
"It's been a lovely day", said Hamilton, a six-time victor in Canada.
At the end of FP3, a loss of power for Pierre Gasly meant Honda had to revert to the previous specification of power unit in his vehicle.
Perhaps the newer specifications being pushed hard on a track where the drivers spend a lot of time on full throttle has played a part.
"I love racing. Trying to put the auto on the limit". Add in the fact that Montreal is particularly tough on brakes, and it will not be an easy Sunday from a vehicle point of view.
Lewis Hamilton drives during a practice session at Circuit Gilles Villeneuve during a practice session for the F1 race in Montreal, Quebec, Canada, June 9, 2018. We don't know what the other cars are doing, so we can not tell our driver "go right, go left". "Obviously here you have only low-speed corners".
Hamilton added: "Straight out of the box today I think we started right with the auto set-up". "There was some electrical stuff going on that hindered us this morning and then this afternoon, so not the best day, but we're OK".
On a dry and sunlit day, there was immediate drama when Frenchman Romain Grosjean pulled up in the pit-lane with clouds of smoke billowing from his Haas car's Ferrari engine. Thanks to the team; thanks for fixing the auto yesterday after I hit the wall a little bit. When we got to qualifying, we knew it was going to be very close, as it was, but in my heart, I really feel like we had the pace to lock out the front row, or I had the pace to be on the front row. "I think if I get any more I might headbutt someone". I couldn't find the rhythm, I wasn't happy with the vehicle.
Sergio Perez of Sahara Force India was best of the rest in P7 and held a 0.043-second lead over Renault's Nico Hulkenberg. Fortunately the forecast looks good this year, with only partly cloudy skies predicted for both Saturday's qualifying and Sunday's race.
With their chief rivals bringing upgraded power units to Montreal, Mercedes were expected to be at a disadvantage as they tried to squeeze a seventh and final race out of their engines.
It was clearly a strategic scrap as the teams were aiming to use the tyres in Q2 that would suit them best to start the race. So constantly today going into that corner I was struggling to get the vehicle stopped, be it front locking or rear locking, so it was quite messy. "We'll have to try and make do without it, but it will mean our performance will probably not be the greatest".
Changing weather is one thing Montreal does well, with the 2011 Canadian GP holding the record for the longest F1 race to date as storms delayed the race for hours.
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