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///M3 Forum
The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 08-10-2011, 04:36 PM   #1
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E46 M3 S54 Intake Cam Sensor DIY

Everyone of the DIY I found was for an M54, not the S54 (M3). So I did it myself and took pics.

I ordered my cam sensor from RMEuropean. I read on someones post that they can do this without removing the intake manifold, may be true, but since I dont have tiny munchkin hands with double jointed fingers, I took mine off (its supercharged so the ESS Manifold is easier to remove since my car is SMG and I have the CSL reservoir. I also took off the plastic valve cover, may not be necessary but again, I did it anyways.

Here is where the intake cam sensor is, this is the harness, the sensor is down an inch and in the head.

1. Remove the cabin filter and housing by removing the 4 torx bolts.
2. Remove intake manifold (search for that DIY) or leave it on...your call.
3. Remove the 2 10mm bolts that hold the fuel rail and "additional air line" to the motor. There is a line that runs from here to the idle control valve that needs to be disconnected, and also the vacuum line for the fuel pressure regulator at the firewall end. Dont remove it completely, just unplug what you can and move it aside.

4. Remove the plastic harness from the 6 fuel injectors. I started at the front of the engine and pulled up slightly while unclicking them from front to back. From the top of the injector you will see two silver tabs, push those to the outside and the injector harness will slide off. The intake cam sensor is also plugged into this same plastic harness.

5. This is where taking the intake manifold off makes life easier. On the cylinder 6 throttle body, there is a plastic guard that keeps vaccum lines and such away from the throttle body linkage. There are 3 - 10mm nuts on the bottom of the throttle body holding it in place. After removing the nuts, clip the ties holding the air and vaccum lines to the top of it. Pull it down to clear the studs holding it in place then steadily away from the block. The harness slides into the side of it and fits onto a prong, no clips, just rubber hugging plastic. Dont forget to pay attention to this on reassembly so you dont have your linkage rubbing the harness later.

6. By now, you have easy access to the intake cam sensor. Its a 5mm allen head that is easiest to get at with a 5mm allen socket and a 6-8in extension.
7. After removing the bolt, finish unhooking the harness from the plug and the 2 clips that hold it to the bottom of the plastic injector harness body.
8. MAKE SURE THE GREEN O RING COMES OUT WITH THE SENSOR, if not, go get it with your fingers. Use a little loc-tite on the bolt and make it snug.

Good luck!

Here is all/more of the photos I took.

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Old 06-26-2012, 01:29 AM   #2
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Thanks for the Post!! I am about to do this tomorrow... Much needed DIY. I will try with the Intake manifold on.. we shall see
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Old 07-23-2013, 06:16 PM   #3
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do you really have to remove intake manifold? Im not very familar with those special cv boot clamps on each TB.

I tried going from below , no luck.

Last edited by ayashifx55; 07-23-2013 at 06:16 PM.
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Old 07-25-2013, 08:54 PM   #4
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I used needle nose pliers, at least I think I did, when I pulled my intake. You really don't need *special* tools to get the clamps loose, and there isn't much tension on them either so reassembly is rather quick.
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Old 07-27-2013, 12:29 PM   #5
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Originally Posted by abakos View Post
I used needle nose pliers, at least I think I did, when I pulled my intake. You really don't need *special* tools to get the clamps loose, and there isn't much tension on them either so reassembly is rather quick.
I actually changed the intake camshaft sensor without taking out the IM. I did not take out the IM because my local shop discountinued the cv boot clamp pliers.

All i did was i broke the plastic with the 3 bolts instead , its pretty useless honestly , this way , it made space for me to get a 5mm allen key there. Also removed valve cover and some of the wires in the way.

I also removed the cabin filter , cabin filter plastic , all of it and there's another plastic held by two torx screws which will give you extra spaces. This plastic is what's under the cabin filter plastic.

Last edited by ayashifx55; 07-27-2013 at 03:23 PM.
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Old 02-08-2014, 12:42 PM   #6
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I'm in the middle of this right now, cant seem to have enough room to get the 5mm Allen key + hinge + 6" extension and loosen the bolt. Did you remove your fuel rail in an effort to make room ?
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