2002 E46 M3 6MT vacuum Leak overhaul part list

[y2k_o__o]

I have a 2002 M3 6MT with 120k miles on the clock, while doing the smoke test, i notice some smoke coming out. Things are getting old and I want to replace ALL plastic hose and rubbers as a preventive maintenance.
So I build a list here. Please feel free to list anything related to vacuum leak parts while I am doing the job.
Very much appreciated !

Item	MPN	Description	QTY
3	11617831930	Under Airbox Vent hose	1
Item	MPN	Description	QTY
1	11617831663	Sucking jet pump with lines (Up to 2002)	1
1	11617836745	Sucking jet pump with lines	1
2	11617831460	Hose elbow	1
3	11617833212	Air shut-off valve	1
6	11151726340	clamp	2
Item	MPN	Description	QTY
2	13417831443	Damper rubber	1
6	13417837597	Hose elbow	1
7	13417831794	Hose clamp	1
8	13417831793	Hose clamp	4
9	13417837653	Hose assy	1
-	-	-	-
11	13417837655	Hose assy	1
12	13417831803	Quick-release coupling	1

Also I am taking this opportunity to seek for low-cost replacement because small section of BMW FPM fuel-grade hose like these for $110+ is just outrageous. I was hoping I can also document a full list with what can be replaced by generic FPM heavy duty fuel-grade line / adjustable hose clamp to keep the cost low.

[jayjaya29]

Vacuum rail to FPR

[y2k_o__o]

Vacuum rail to FPR

Yes Thanks ! I already replaced it with 1/8" siliecone hose at the beginning of the season, but good call !

[ac427]

Thanks for the interesting thread.

What symptoms do you get if you have a vacuum leak?

How and what equipment is required to perform the smoke test?

The plastic pipe (the first part you listed) from the crankcase to the bottom of the airbox becomes brittle.
Some have made a new pipe by using flexible hose and re-using the ends from the original pipe.

[maupineda]

My experience is that s54s are not too sensitive to vacuum leaks if minor. You’d need to have a big one. I know this as I was running a Karb box with MAF and it was not tight, yet the car could be mapped just fine for fuel trims. I fixed it, but was never an issue I could note.

[y2k_o__o]

Thanks for the interesting thread.

What symptoms do you get if you have a vacuum leak?

How and what equipment is required to perform the smoke test?

The plastic pipe (the first part you listed) from the crankcase to the bottom of the airbox becomes brittle.
Some have made a new pipe by using flexible hose and re-using the ends from the original pipe.

I bought a smoke tester from Amazon and it seems smoke are coming below the airbox, most likely either one of those I listed in my part list.
Might as well replace them all while I am there for the peace of mind.

[heinzboehmer]

My experience is that s54s are not too sensitive to vacuum leaks if minor. You’d need to have a big one. I know this as I was running a Karb box with MAF and it was not tight, yet the car could be mapped just fine for fuel trims. I fixed it, but was never an issue I could note.

+1. Helps that there's few vacuum lines on this engine.

[y2k_o__o]

During smoke test, I have very very light smoke coming below air intake box. I suspect it's the hose that connects to the oil pan with a check valve.
My STFT are very normal (within 4%), but LTFT is constantly high (>13%) without no CEL.
Since all the tubes are more than 22 years old, might as well replace all of them
i found the Genuine BMW tubes are skinny and flimsy, is there any robust solution to replace those skinny tube?

One good example is the crankcase ventilation hose that cracked, I replaced the hose with 5/8" heavy duty fuel hose and re-use the fitting with hose clamp.