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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Sat, May-14-2016, 12:51:22 PM   #41
vmbray
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Default Re: Car idle and acceleration hesitating

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Originally Posted by MOTRSPRT View Post
No actually. Never even crossed my mind. How could the VANOS cause this engine to run so shi**y like it is? If it's a possibility point me in the direction of what maintenance should be performed on it.
Have you scanned for codes? My case was different BUT I learned if the dme thinks vanos isn't working it will set the cam angle at 90 degrees or so and engine will suck a lot. Inpa is invaluable here to see what's going on as it shows you the values while engine is running.

Any issue where it clears up or runs better around 3-4k warrants looking at vanos. It advances around 4.2k but can affect the engine at all rpm because it controls the cam angle. It's a must do maintenance item.

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Old Sat, May-14-2016, 01:19:42 PM   #42
vmbray
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Default Re: Car idle and acceleration hesitating

Oh I see your codes, you would have vanos or camshaft errors.

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Old Sun, May-15-2016, 02:36:40 PM   #43
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Default Re: Car idle and acceleration hesitating

I'll try pulling codes again today. Maybe something has changed because it's running worse than when I started this thread.


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Old Mon, May-16-2016, 04:31:17 AM   #44
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Default Re: Car idle and acceleration hesitating

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I'll try pulling codes again today. Maybe something has changed because it's running worse than when I started this thread.


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Can't hurt to service and test vanos anyway. My car had had the seal done and the timing was slightly off so it ran a bit better afterwards.

Also, injectors? Bad injector could maybe cause O2 sensor error. Also the other error looks like idle air valve, you said cleaning it didn't help, maybe it's fried.
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Old Tue, May-24-2016, 11:24:39 AM   #45
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Default Re: Car idle and acceleration hesitating

I didn't see this last post until now...
But I started in removing the intake manifold to replace the gaskets and all vacuum lines anyway. I found this:



That o-ring is tore, but I didn't have any fuel leaks. Might be a good time to remove these injectors and get them flow tested and balanced/repaired.

Also while I'm mentioning my intake manifold can anyone identify this cable? It's electrical, and not a vacuum line.



I think the only way to remove it is to remove it from intake manifold. Looks like I gotta remove the black box from underneath the manifold?

Im hoping that doing this maintenance addresses my issue or at least helps...


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1998 M3
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2011 Ducati 1198
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Old Tue, May-24-2016, 11:57:41 AM   #46
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Default Re: Car idle and acceleration hesitating

That IS a vacuum line. It's not an electrical cable.

While you are doing work, clean your crank position sensor. It's magnetic, and just a little bit of gunk can make the car run like crap. And, you know, cleaning it is easy and free.
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Old Tue, May-24-2016, 12:23:18 PM   #47
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Default Re: Car idle and acceleration hesitating

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That IS a vacuum line. It's not an electrical cable.

While you are doing work, clean your crank position sensor. It's magnetic, and just a little bit of gunk can make the car run like crap. And, you know, cleaning it is easy and free.


Okay that is good news knowing it's a vacuum line. I can pull harder .

As for the crank position sensor I actually have a new one to install. I already tried to replace it but couldn't get my arm and hand to bend correctly. LOL!


2007 M6
2003 M3
1998 M3
1997 318 vert
2011 Ducati 1198
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2003 M3 SMG Imola Red--AP headers, SGT sec. 1 w/200 cell cats, AR20'resonators sec. 2, SGT SCZA muffler, K&N cai, Tein springs, 19" factory wheels
1998 M3/4 Dakar Yellow--supercharged

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Old Tue, May-24-2016, 02:17:33 PM   #48
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Default Re: Car idle and acceleration hesitating

that injector O-ring probably tore when you pulled the rail off. otherwise you would have had a catastrophic leak
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Old Tue, May-24-2016, 02:25:46 PM   #49
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Default Re: Car idle and acceleration hesitating

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that injector O-ring probably tore when you pulled the rail off. otherwise you would have had a catastrophic leak


Agreed. Was thinking same thing.


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2003 M3
1998 M3
1997 318 vert
2011 Ducati 1198
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2003 M3 SMG Imola Red--AP headers, SGT sec. 1 w/200 cell cats, AR20'resonators sec. 2, SGT SCZA muffler, K&N cai, Tein springs, 19" factory wheels
1998 M3/4 Dakar Yellow--supercharged

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Old Wed, May-25-2016, 04:48:15 AM   #50
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Default Re: Car idle and acceleration hesitating

Quote:
Originally Posted by nrubenstein View Post
That IS a vacuum line. It's not an electrical cable.

While you are doing work, clean your crank position sensor. It's magnetic, and just a little bit of gunk can make the car run like crap. And, you know, cleaning it is easy and free.
That's a good tip thanks

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Discussing Car idle and acceleration hesitating in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)