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Old 09-25-2012, 10:11 PM   #278199
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Location: Sunnyvale, CA <-- Ithaca, NY <-- dirty jerz (201) Useful Posts: 25
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Originally Posted by briangl92 View Post
Kalim, the master tech came out and said the injector noise is typical of the M56. Apparently the larger injectors they run are just noisier.

I still find it interesting that with the same 2.5L block, it has a larger intake diameter and higher flow injectors than an M54. Makes you wonder what kinda power it'd make with a good tune and one less set of cats

Apparently the pressure bleed off is also normal. He said there's a purge valve in the pump. He said on rare occasions the valve can go bad but starts will take on the order of 5+ seconds.

The fuel tank filling issue is an issue they're gonna look into though.
Yes, that's what I've discovered in my research about M56 injectors as well. I've been trying to figure out if they get louder if fuel pressure is low, but so far haven't found any solid data.

I think he meant the non-return valve in the pump.
The system should bleed off pressure slowly. It should fall 0.5 bar or less within 20-30 minutes of the pump being switched off.
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Originally Posted by koven View Post
i'd rather be gapless with no bulge
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