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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 Fri, Jun-16-2017, 02:23:45 PM   #21
Jfbsaratoga
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Default Re: 2002 e46 m3 post vanos rebuild hesitation at warm start up with video!

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Originally Posted by gum1993 View Post
Ok thanks for ur input. If they got the timing of the engine wrong is it bad to drive the car? I mean the car runs fine and I've been driving it to work. Hope that doesn't damage anything.
Good question. I've been told that the vanos will adjust up to 8 of the angle to avoid piston to valve contact. I guess it depends on how off it was. If it was way off, you would have a serious problem with the way the engine runs. If it is a little off, you probably won't notice. I think in your case it is somewhere in between.

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Old Fri, Jun-16-2017, 05:10:51 PM   #22
gum1993
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Default Re: 2002 e46 m3 post vanos rebuild hesitation at warm start up with video!

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Originally Posted by Jfbsaratoga View Post
Good question. I've been told that the vanos will adjust up to 8 of the angle to avoid piston to valve contact. I guess it depends on how off it was. If it was way off, you would have a serious problem with the way the engine runs. If it is a little off, you probably won't notice. I think in your case it is somewhere in between.

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Ok I see, ya i don't think my problem is too serious. Almost every morning it starts just like normal without a problem, seems like it happens more when the car is warm but yet again it's very random when it wants to hesitate to start. I'll keep u guys posted on whats going on, I really hope it's nothing major.
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Old Sun, Jun-18-2017, 07:39:52 PM   #23
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Default Re: 2002 e46 m3 post vanos rebuild hesitation at warm start up with video!

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Hmm interesting, that's good to know! I'll prob show this to the shop when i drop it off. What caused the pressure regulator valve to fail? Was it just installed wrong or was it caused just by coincidence?
100% not installed wrong, just a part that went bad. No information beyond that to share.

Have you done a DIS vanos test or pulled any codes yet?
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Old Sun, Jun-18-2017, 09:44:56 PM   #24
02_LSB
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Default 2002 e46 m3 post vanos rebuild hesitation at warm start up with video!

OP mentions nothing about cam bolts or chain guide, that means the timing was never affected.

OP, it is not your timing, but could be a million other things.

Check easy stuff first, clean your MAF, I'm also assuming you're running a stock airbox. Check that all ducting is properly tightened.

Ps. The Less good news is that you should've replaced cam bolts and chain guide.
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Last edited by 02_LSB; Sun, Jun-18-2017 at 09:50:27 PM.
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Old Sun, Jun-18-2017, 09:54:52 PM   #25
02_LSB
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Default Re: 2002 e46 m3 post vanos rebuild hesitation at warm start up with video!

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Originally Posted by Jfbsaratoga View Post
Good question. I've been told that the vanos will adjust up to 8 of the angle to avoid piston to valve contact. I guess it depends on how off it was. If it was way off, you would have a serious problem with the way the engine runs. If it is a little off, you probably won't notice. I think in your case it is somewhere in between.

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That makes sense about the 8 degrees. When fully retarded camshafts have about 7-10 degrees of freedom, without engaging the spline gear. I actually tried to research of how critical it is to catch the first spline.


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Old Mon, Jun-19-2017, 02:11:18 AM   #26
gum1993
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Default Re: 2002 e46 m3 post vanos rebuild hesitation at warm start up with video!

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Originally Posted by nervous24 View Post
100% not installed wrong, just a part that went bad. No information beyond that to share.

Have you done a DIS vanos test or pulled any codes yet?
No I have not done a dis vanos test. I don't have the equipment to do so. Are local BMW shops supposed to be able to do that? If so I'll take it and get it checked.
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Old Mon, Jun-19-2017, 02:20:57 AM   #27
gum1993
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Default Re: 2002 e46 m3 post vanos rebuild hesitation at warm start up with video!

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Originally Posted by 02_LSB View Post
OP mentions nothing about cam bolts or chain guide, that means the timing was never affected.

OP, it is not your timing, but could be a million other things.

Check easy stuff first, clean your MAF, I'm also assuming you're running a stock airbox. Check that all ducting is properly tightened.

Ps. The Less good news is that you should've replaced cam bolts and chain guide.
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Sorry I should of mentioned that my camshaft bolts were replaced both the intake and exhaust side, but my chain guide was not. Also had my spark plugs changed and valves adjusted while they did the vanos work. I personally think it's gotta be something they did wrong or went wrong during the installation.
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Old Mon, Jun-19-2017, 02:24:57 AM   #28
02_LSB
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Default Re: 2002 e46 m3 post vanos rebuild hesitation at warm start up with video!

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Originally Posted by gum1993 View Post
Sorry I should of mentioned that my camshaft bolts were replaced both the intake and exhaust side, but my chain guide was not. Also had my spark plugs changed and valves adjusted while they did the vanos work. I personally think it's gotta be something they did wrong or went wrong during the installation.


Ask them if they used an OE camshaft alignment tool


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Old Thu, Jun-22-2017, 07:21:50 PM   #29
gum1993
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Default Re: 2002 e46 m3 post vanos rebuild hesitation at warm start up with video!

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Originally Posted by 02_LSB View Post
Ask them if they used an OE camshaft alignment tool


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So the car is at the shop right now and they claim that they took it apart and checked the timing etc which all checked out fine. He said he was getting a code for low fuel pressure. He looked at the fuel filter and claims it needs to be replaced. They replaced the fuel filter but the car is still having hesitation to start. He is trying to do the relearn process on the car but it's not letting them since it's saying dmtl pump failure. They are saying they want to replace that so they can do the relearn process. What exactly is going on? I'm getting confused and frustrated. Am I getting ripped off? What idea dmtl pump?
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Old Sat, Jun-24-2017, 12:01:20 AM   #30
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Default Re: 2002 e46 m3 post vanos rebuild hesitation at warm start up with video!

Dmtl is the device that checks the fuel system for leaks and sets the check engine light if it finds a leak. It's not super advanced on the e46 , I don't understand what your shop is telling you. If they are confident it's not the timing or vanos work related it might be your fuel pump.
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Discussing 2002 e46 m3 post vanos rebuild hesitation at warm start up with video! 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)