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Beitrag: [QUOTE="exmantaa, post: 572319, member: 8577"] 1st rule in autorepair: Never, never exclude a part "because I changed it a few months ago and so it cannot be wrong now". First check, than exclude! This problem sounds really like a blocked exhaust........ A catalysator can easily be destoyed by some ignition fault => unburnt fuel melts your cat => exhaust block! So again: check it. Unscrew the cat in front and just test if it runs better with only the exhaustmanifold! (And Motronic is not looking to the Lambda sensor in the first few minutes after cold start, so it must run O.K. then if this one is faulty.....) So when there are no obvious faultcodes, check the basics: Check ignition on 4 cilinders, and look to the plugs => OK? Check fuelpump and pressure at rail =>OK? Control timing camshaft belt! =>OK? Control compression if you can =>OK? Control watertemp sensor value and check wires and connectors! ....... I don't know anymore. Frank [/QUOTE]

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