Rob says

Car Mechanics (UK) - - DIY Servicing -

Ac­cord­ing to in­de­pen­dent Saab spe­cial­ist, Aero­mo­tive Sports and Per­for­mance, the tim­ing chain on the 9-3’s petrol en­gine can wear and even­tu­ally break its guides. If the tim­ing chain rat­tles on a cold start-up and the en­gine is lumpy at idle when warm, these are com­mon signs of a worn chain. ROB HAWKINS Spe­cial Con­trib­u­tor

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