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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Dec-31-2019, 04:29:06 AM   #1
dutchhome
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Default Slow VANOS

It seems that even after dialing up the pressure to 115 bars my VANOS tests are still not any better. Any thoughts on what could cause the slow responses? I did a full Beisan upgrade including the solenoid pack when I installed my new cams and followers. Any thoughts would be appreciated.

Inlet Retard 59.9 deg
Inlet Advance -0.8 deg
Exhaust Advance 0 deg
Exhaust Retard 47.8 deg

Deviation Leak Test Inlet 0.3 deg
Deviation Leak Test Exhaust 1.3 deg
Advance Time Inlet 323ms (out of spec)
Retardation Time Inlet 230ms
Advance Time Exhaust 252ms
Retardation Time Exhaust 219ms

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Old Tue, Dec-31-2019, 04:35:01 AM   #2
terraphantm
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Default Re: Slow VANOS

In my case replacing the valve body and then pressure regulator ultimately did the trick. Since your pressure is within spec, I guess I'd try replacing the valve body.
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Old Tue, Dec-31-2019, 04:52:39 AM   #3
dutchhome
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Default Re: Slow VANOS

Thanks. I know my engine has lots of the orange, hardened, and baked on oil so maybe some of that is caked up in there. Luckily a valve body with less than 100k miles was available on eBay for not too much money so I ordered it. Will give it a swap and see if that helps.

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Old Tue, Dec-31-2019, 04:56:08 AM   #4
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Default Re: Slow VANOS

Quote:
Originally Posted by terraphantm View Post
I'd try replacing the valve body.
Same as solenoid pack?

Each piston has 2 solenoids: one connected to high pressure and one for releasing to oil pan, and I think the latter is leaking.
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Old Tue, Dec-31-2019, 05:01:57 AM   #5
dutchhome
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Default Re: Slow VANOS

Quote:
Originally Posted by sapote View Post
Same as solenoid pack?



Each piston has 2 solenoids: one connected to high pressure and one for releasing to oil pan, and I think the latter is leaking.
The valve body is the metal piece bolted to the solenoid body. I replaced the seals with the Beisan high temp orings and I believe the mating surface was nice and clean. I did the magnet trick with brakes cleaner to clean the valve body. I could hear the valves clicking ok but wasn't sure all pathways were as free flowing as they should have been. This engine has 200k miles on it so replacing it may not be a bad idea regardless.

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Old Tue, Dec-31-2019, 05:06:32 AM   #6
Drewster
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Default Re: Slow VANOS

Quote:
Originally Posted by sapote View Post
Same as solenoid pack?

Each piston has 2 solenoids: one connected to high pressure and one for releasing to oil pan, and I think the latter is leaking.
Solenoid pack (plastic with PCB and inductor) failures are usually solder failures, so an all or none kind of thing.

Valve body (the aluminum section that goes with the solenoid) usually just degrades, slowing the response time of the system. Putting a magnet on the valve to open it (Beisan) and spraying the crap out of it with parts cleaner (and/ or) soaking it in gasoline usually improves the response, and a few drivers I've met can tell the difference on the butt dyno.
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Old Tue, Jan-07-2020, 09:26:09 PM   #7
M3 dude
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Default Re: Slow VANOS

keen to know outcome of this. have exactly same symptoms.
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Old Tue, Jan-07-2020, 11:37:03 PM   #8
dutchhome
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Default Re: Slow VANOS

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Originally Posted by M3 dude View Post
keen to know outcome of this. have exactly same symptoms.
I have a new (used) valve body. Still waiting to clean and install it.

I can report that increasing the oil pressure didn't speed up the slow vanos but it did improve the other numbers (cam angles?). I guess that extra pressure gave it more power to advance the cams fully?

Anyway, I'll report hopefully soon with news about the valve body replacement.

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Discussing Slow VANOS in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)