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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 Wed, Jan-08-2020, 01:52:44 PM   #1
Fresh1179
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Default Things to Do With Plenum Off?

I have my plenum off waiting for a couple of parts to arrive for a Karbonius Airbox. Iíve combed the threads and have founds some things that I might as well replace given the miles on the car (100k). I was looking to see if anyone had some addition advice. I have:

1. Clean throttle bodies-check
2. Clean ICV valve-Check
3. General Engine Bay Cleaning-check
4. Replace throttle position sensors-on the way
5.???????

Thanks
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Old Wed, Jan-08-2020, 02:57:03 PM   #2
repoman89
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Default Re: Things to Do With Plenum Off?

I did all that (kept the perfectly good rear TPS in a box to replace the front one with some day ..) and one other thing .. the E46 CSL / non-M water valve thing on the driver side of the engine bay. Some people say the larger stock M3 one hits the airbox, so I didn't want to have that possibility for extra pain. $45 or so on eBay since they're so plentiful in the non-Ms. There's a thread on it floating around here somewhere.
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Old Wed, Jan-08-2020, 02:58:41 PM   #3
terraphantm
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Default Re: Things to Do With Plenum Off?

I don't know if I'd bother with the throttle position sensors. The one on the actuator rarely fails. The one by the oil filter housing is stupid easy to access. If the one on the actuator does fail eventually, it's not *that* hard of a job to just remove the plenum again.
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Old Wed, Jan-08-2020, 03:33:55 PM   #4
Obioban
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Default Re: Things to Do With Plenum Off?

I'd clean the starter terminals and replace the TPS sensor... and then keep the one you pulled in your trunk for the day the top one inevitably fails. The bottom one rarely does fail, but the top one does often enough that it's one of two spare parts I carry with me always (the other being a coil).
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Old Wed, Jan-08-2020, 03:38:21 PM   #5
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Default Re: Things to Do With Plenum Off?

Quote:
Originally Posted by Obioban View Post
I'd clean the starter terminals and replace the TPS sensor... and then keep the one you pulled in your trunk for the day the top one inevitably fails. The bottom one rarely does fail, but the top one does often enough that it's one of two spare parts I carry with me always (the other being a coil).
I did that and the one I installed preventively failed like 2 months later lol. Put the original back and it ran fine for years until I replaced the actuator (which came with a new TPS).
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Discussing Things to Do With Plenum Off? 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)