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BMW 320d 2003 manual

Low power - Turbo kicks in after 3000 RPM & then insufficient boost. Changed turbos twice - removed both "cats" from exhaust - checked all vacume & pressuer pipes - invectors changed - agent says all systems are within specification. What else can I look at to solve this problem? Thanks Derek

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Air mass sensor

Posted on Jan 27, 2009

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My golf lost all power and wont go over 3000 rpm's

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There are a few possibilities that come to mind.
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Revving fine when in neutral may not tell you much, other than that the engine can rev. The gating system will (or should) run differently under load - whether climbing a hill or accelerating, this is where you want the turbo boost to give you the extra power. THat's where the exhaust gate should stay shut, or mostly shut, to allow the turbo to force more air into the pistons.

You might want to check whether the APC (Automatic Performance Control) for the turbo has a separate fuse. (The name might be different on your model, I'm remembering from my 80s/90s era Saabs). If the fuse is blown, that could also lead to lame performance, especially as I'd imagine that the system would be built to fail or go to full open if the APC fails or loses power - that'd keep people from having run-away power that they can't manage.

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