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Old 20-06-2015   #16
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Re: Low Pick Up after quick acceleration

.....follow on.....I think actually it's a "granny flap" wastegate seized thing! The car had been used by two ladies......I suspect very gingerly and probably they never whizzed it up to decent revs or turbo boost ......so the "granny flap" wastegate never opened and got stiff/ semi seized. I whizzed it up to 100 mph for the first time in its life and the wastegate opened for the first time, on deceleration , the steel actuator arm was sticky enough in the casting due to crud build up and also because exhaust gases were pushing it open to remain open......which meant of course the turbo couldn't deliver any boost. So you stop the car and do some other stuff (like undoing the filler cap) restart the motor and by this time the return spring has been able to push the wastegate back to its seat ( also due to no exhaust gases pushing it open) and decent boost is achieved. So in a way I was right , it was fuel starvation.....but due to minimal turbo boost. The solution ? Two. Millers Eco Max diesel treatment and cycling the wastegate by revving the tits off it and then turning engine off . The occasional italian tune up too!
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Old 08-07-2015   #17
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Re: Low Pick Up after quick acceleration

Been boning up on oils. The Fiat recommendations are for B3 grade oils but these have a higher tendency to put particulates in the exhaust system and they are not extended life oils . A 12,000 mile oil change interval on a car which only holds 2.5 litres of oil in the sump is a long interval in my book. B4 and higher grades of oils create low particulates and are true extended life oils. The low particulate thing is important because high particulates will coat exhaust ports, exhaust system , turbo, cat, and even the wastegate linkage in soot and that could be part of the reason (along with a gentle right foot) that the wastegate seizes and/or performance is down. Use a low particulate higher spec (B4 or higher) oil and a regular italian tune up to burn deposits out of whole exhaust system.
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