Need a favour from someone with INPA/BMW Diagnostics

[AndyBeech]

Hey guys, trying to diagnose the hesitation/misfire issue on the S54 engine with James as Redish Motorsport but need another Z4m running INPA/BMW Diag to compare results.

Anyone with the BMW diagnostic software, when hooking up your car at idle and normal operating temprature, go to the VANOS operation screen and if you could tell me what your 'VANOS Set Point' value is would be brilliant!
Cheers for any help!

 

[Anonymous]

Hi,

Coolant temp :80 degrees

Oil temp over 90 degrees.

VANOS Inlet Setpoint (VANOS Einlass Sollwert): 130.1

VANOS Exhaust Setpoint (VANOS Auslass Sollwert): 127.4

2007 Z4M S54 with 43,000 miles on clock and FBMSH.

 

[AndyBeech]

Awesome cheers buddy

Do you have the hesitation/dodgy idle as has been well documented?

Mine are well out of range, just wondering if this could be something to do with the issue as no one appears to have explored VANOS thus far.

If anyone else can also add if they can do, also the 'VANOS Excenter Actual Value' as well if possible.

 

[Anonymous]

Awesome cheers buddy

Do you have the hesitation/dodgy idle as has been well documented?

Mine are well out of range, just wondering if this could be something to do with the issue as no one appears to have explored VANOS thus far.

If anyone else can also add if they can do, also the 'VANOS Excenter Actual Value' as well if possible.

Hello, my hesitation and dodgy idle was completely cured by cleaning the ICV.

Unfortunately it was a while ago now and it is coming back so I need to do it again at some point. I am sure you have seen the thread on it.

The hesitation and kangaroo when cold I had was cured through a DME update which also improved general drive ability.

My car has what I can only describe as a bit of a flat spot between 1250 and 1650RPM which is common to most of them I believe. I would say this is related to the VANOS but it is not major enough for me to investigate and spend money on it. Above this rev range it is fine and that is where the S54 is happy anyway, its basically a race engine.

 

[AndyBeech]

Awesome cheers buddy

Do you have the hesitation/dodgy idle as has been well documented?

Mine are well out of range, just wondering if this could be something to do with the issue as no one appears to have explored VANOS thus far.

If anyone else can also add if they can do, also the 'VANOS Excenter Actual Value' as well if possible.

Hello, my hesitation and dodgy idle was completely cured by cleaning the ICV.

Unfortunately it was a while ago now and it is coming back so I need to do it again at some point. I am sure you have seen the thread on it.

The hesitation and kangaroo when cold I had was cured through a DME update which also improved general drive ability.

My car has what I can only describe as a bit of a flat spot between 1250 and 1650RPM which is common to most of them I believe. I would say this is related to the VANOS but it is not major enough for me to investigate and spend money on it. Above this rev range it is fine and that is where the S54 is happy anyway, its basically a race engine.

I did buy a new ICV to be replaced but at £255 from BMW James advised that it was unlikely that a new unit would be worth it as its a simple part which by nature doesn't need replacing. If you don't know Redish the guy has about 5 E46 M3's in at his garage at a time so he knows these engines and he's never had to replace an ICV. I believe the ICV is the same on the Zed as the E46, I think it's the DME which is more sensitive on our cars or something along those lines.
He did say the same as you though in that it's not worth ploughing money into it as the engine does work fine when it's being used as it should be.
I'll probably investigate the VANOS side of it on mine and then leave it as that.
Thanks for the input though Sniffer, appreciated

 

[Anonymous]

The well known and documented hesitation and idle issue IS caused by the ICV.

I know James has a lot of experience but my car had it and cleaning the ICV fixed it. I believe it is due to the different engine management to E46 as E46 does not seem to be affected.

In my opinion,
It does not matter how simple the part is, the S54 has multiple throttle bodies and an idle by pass set up. When you jab the throttle, the ECU is expecting a set amount of air to be going in for a throttle opening, if this is slightly out due to the ICV being sticky, then you will experience the hesitation and quick kangaroo. If is all finely tuned and the ICV throws it out when not working 100 percent as intended and the ECU is expecting.