Lewis Hamilton was quickest during second practice for the Malaysian Grand Prix despite limited running due to reliability issues.

Hamilton completed just four laps in the morning session before stopping on track, with Mercedes confirming an engine problem needed investigating. Having traced the cause to the power unit inlet system, the team admitted Hamilton could miss FP2 as it worked to fix the issue.

However, Mercedes quickly carried out the work and Hamilton was able to join the session around the halfway mark, going on to complete a further 16 laps and set a best time of 1:39.790 on medium tyres.

Kimi Raikkonen continued the encouraging start to Ferrari's weekend by beating Nico Rosberg to the second fastest time as he posted a 1:40.163. Rosberg was only 0.05s adrift of Raikkonen, but will be more concerned by the gap of over 0.4s to his team-mate.

Red Bull had a bittersweet session as Daniil Kvyat finished fourth fastest and little more than half a second off the pace set by Hamilton. However, while Kvyat's time hints at progress, team-mate Daniel Ricciardo was again hit by reliability issues as he completed just 8 laps in the session.

There were signs of Williams' pace as Valtteri Bottas was fifth fastest ahead of Felipe Massa in sixth, with both cars - as well as Sebastian Vettel on hard tyres in the second Ferrari - comfortably within a second of the fastest time.

Vettel's session was not without incident as he had a spin at Turn 11, losing the rear of the car on entry but stopping short of the gravel. The German was not the only driver to have such an incident, with Roberto Merhi causing a red flag a few minutes earlier. Merhi also spun off at Turn 11, beaching his Manor in the gravel and requiring the car to be recovered by the marshals.

While Merhi was limited to just six laps as a result of his off, Will Stevens managed a later run on medium tyres which saw him post a time nearly a second inside 107% of Hamilton, suggesting Manor should be able to qualify on Saturday.

McLaren again found itself at the back of the midfield having appeared slightly closer to the pace in the morning session, with Fernando Alonso and Jenson Button separated by 0.1s. Button himself was complaining of the car's handling in low speed corners and said on the radio that McLaren is "a long way from where we need to be".

Click here for Friday's gallery from the Malaysian Grand Prix

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Pos Driver Team Time Laps
01 L. Hamilton Mercedes 1:39.790 16
02 K. Raikkonen Ferrari 1:40.163 29
03 N. Rosberg Mercedes 1:40.218 26
04 D. Kvyat Red Bull 1:40.346 17
05 V. Bottas Williams 1:40.450 31
06 F. Massa Williams 1:40.560 27
07 S. Vettel Ferrari 1:40.652 29
08 M. Verstappen Toro Rosso 1:41.220 30
09 M. Ericsson Sauber 1:41.261 30
10 D. Ricciardo Red Bull 1:41.799 8
11 P. Maldonado Lotus 1:41.877 15
12 F. Nasr Sauber 1:41.988 30
13 S. Perez Force India 1:42.242 24
14 C. Sainz Toro Rosso 1:42.291 31
15 N. Hulkenberg Force India 1:42.330 28
16 F. Alonso McLaren 1:42.506 25
17 J. Button McLaren 1:42.637 24
18 R. Grosjean Lotus 1:42.948 7
19 W. Stevens Manor 1:45.704 12
20 R. Merhi Manor 1:47.229 6
Andrew Lewin

Andrew first became a fan of Formula 1 during the time when Michael Schumacher and Damon Hill were stepping into the limelight after the era of Alain Prost, Nigel Mansell and Aryton Senna. He's been addicted ever since, and has been writing about the sport now for nearly a quarter of a century for a number of online news sites. He's also written professionally about GP2 (now Formula 2), GP3, IndyCar, World Rally Championship, MotoGP and NASCAR. In his other professional life, Andrew is a freelance writer, social media consultant, web developer/programmer, and digital specialist in the fields of accessibility, usability, IA, online communities and public sector procurement. He worked for many years in magazine production at Bauer Media, and for over a decade he was part of the digital media team at the UK government's communications department. Born and raised in Essex, Andrew currently lives and works in south-west London.

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