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Discussion Starter · #1 ·
I just got a weird ticking sound from behind the intake manifold. The oil is fine and it’s not overheating. The car has 171,473 miles and is in pretty good condition. The P0421 code goes on occasionally and goes back off. If anyone knows anything, it would be greatly appreciated.
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Ricer
2009 BMW 3-Series 335i Coupe
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135 Posts
With my experience, ticking is usually your injectors. I'd start there if anything.
 

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Basically Stock
2009 GS Turbo. 2007 GT
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6,845 Posts
6G75 tick. The lifters will tick whenever not in MIVEC. That could be "weird" to some people who aren't used to hydraulic VVT systems. If its unusually loud, valve lash having not been adjusted proper or at all is a frequent cause. But that'll be front and back of the engine at the cams.

Reasons found behind the intake manifold could be the EVAP solenoid, or EGR valve.

Injectors tick because they are solenoids. But that's front and rear bank as well.
 
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