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Premium Member
2003 330cic, 2003 325iT
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7,290 Posts
Discussion Starter · #1 · (Edited)
This post outlines a part list and task list for removing the intake and refreshing the systems that are connected and lie beneath. I have had the luxury of "restoring" several e46s (3 verts and a touring) with varying mileage over the past 9 months, and I believe an intake refresh is a relatively inexpensive way to eliminate a lot of issues and keep the engine running great after about 150k miles.

While I completely respect the "don't replace what isn't broken" mentality, I balance that against these other factors:

1. Some wear items, notably suspension, shifter bushings, and flex discs, wear gradually, like a frog in boiling water, and you don't get codes, or even visual signs when they are degrading. Replacing them after their useful lifespan is what I would call an "OE mod", as it will dramatically and noticeably improve performance.

2. Some, like sensors, will not throw codes even as they are past their useful lifespan, for example, 100-125k for O2 sensors or 150-175k for the MAF. They are maintenance items like oil and oil filters, and they just need to be replaced. I am certain that few here send their oil to be tested before every oil change. My lifespan numbers either come from the manufacturer (Bosch) or from direct experience diagnosing and solving P0171/4, P0303, and general lean conditions.

3. Certain projects are "while you are in there". The intake is a textbook example. You can replace the starter, CVV, and many other parts with the intake in. However, you can't replace the intake seal that way. Once you get the intake off, ALL of these projects become massively easier, and some difficult to diagnose problems become relatively easy - "Holy cow, that hose disintegrated in my hand!"

The entire project should cost about $550-800 for the intake, which is a few months' lease payments on a new car.

I will provide another guide for full refresh costs. I am attaching PDFs, but if anyone wants the underlying spreadsheets please private message "conversate" me and I can send it in Numbers or Excel. I have a guide for m56 as well - it is much simpler as there is no CVV.

If you have a 325, here is the list: e46 325 Intake Refresh

OFHGOil filter housing gasket
alternative: Viton Oil Filter Housing Gasket from ECS Tuning
11421719855
11421719855V
1​
$‎9.09
$34.95
OFHGVANOS oil feed line - Rein11361705532
1​
$‎ 27.99
OFHGOil temperature sensor13621433076
1​
$‎ 11.35
OFHGVANOS oil line crush washers324110935962$1.44
OFHGOil pressure sensor12618611273
1​
$‎ 8.99
CVVCVV Valve - BMW11617501566
1​
$‎ 23.99
CVVOil separator hose - valve cover to CVV11611432559
1​
$‎ 13.60
CVVOil separator hose - connecting hose to CVV11617504535
1​
$‎ 13.63
CVVBreather hose - Vent valve to dipstick tube11157532649
1​
$‎ 8.33
CVVBreather hose - Return - Oil separator hose to valve cover11617504536
1​
$‎ 12.99
SealsIntake manifold gasket - Elring11611436631
1​
$‎ 22.52
SealsDipstick lower o-ring - CRP11431740045
1​
$‎ 0.38
SealsEngine air distribution o-ring - Elring11617502761
6​
$‎ 5.94
SealsThrottle body gasket13547504729
1​
$‎ 4.44
SealsIntake air temp sensor o-ring13621743299
1​
$‎ 0.27
SealsDISA gasketGA-BM-DISA-ORING-M54-S
1​
$‎ 5.65
HoseUpper intake boot13541438761
1​
$‎ 20.74
HoseIntake lower boot13541438759
1​
$‎ 10.03
O2 Pilot ModVacuum hose - O2Pilot mod11657803732
1​
$‎ 30.09
O2Pilot ModSilicon vacuum hose - black - CRP11727545323
1​
$‎ 2.71
O2Pilot ModMercedes vacuum power adapter - O2Pilot mod1170780681
1​
$‎ 4.14
SensorCrankshaft position sensor12141709616
1​
$‎ 66.11
Hard lineBMW Coolant82141467704
1​
$‎ 20.00
Hard lineHeater hard line - inlet pipe11531705210
1​
$‎ 30.81
Hard lineCooling hard line - outlet pipe11537502525
11537502000 (Xi and X3/5 only)
1​
$‎ 40.85
OptionalCoolant plug07119904539
1​
$‎ 1.98
OptionalCoolant washer07119963200
1​
$‎ 0.18
OptionalFuel rail clip13537528539
6​
$‎ 10.00
OptionalInjector o-ring upper - Elring13641437487
6​
$‎ 5.22
OptionalGas hose clip13311716049
1​
$‎ 2.70
OptionalFuel tank breather line13907558190
1​
$‎ 42.60
OptionalSucking jet pump lower hose11617503666
1​
$‎ 24
OptionalSucking jet pump lower hose upper clamp11151726340
1​
$‎ 3.63
OptionalSucking jet pump lower hose lower clamp11151726339
1​
$‎ 1.85
OptionalStarter motorSR0448N
1​
$‎ 167.12
OptionalMAF sensor13627566983
1​
$‎ 197.30
OptionalIntake camshaft position sensor12147539165
1​
$‎ 48.44
OptionalExhaust camshaft position sensor - VNE12147518628
1​
$‎ 30.00
Fuel
OptionalFuel filter - Kayser13327512019
1​
$‎ 52.82
OptionalFuel pump - VDOVDO-228222009002Z
1​
$‎ 139.79
Optional12-20 hose clamps
6​
$‎ 5.00
 

Attachments

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4 Posts
I wish I bought my used e46 from you. Nice list. I’m about a year and a half in and I’ve done about 25% of this. Thanks for posting!
 

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2018 Audi S4
Joined
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6,586 Posts
I was looking at the part numbers for the camshaft sensors, I think you have them reversed. I searched and the intake number came up as exhaust and vise versa. I wish I had known about the VNE sensors when I did the intake sensor on mine. Would have saved some cash.
 

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Registered
2004 BMW 325ci convertible
Joined
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167 Posts
This post outlines a part list and task list for removing the intake and refreshing the systems that are connected and lie beneath. I have had the luxury of "restoring" several e46s (3 verts and a touring) with varying mileage over the past 9 months, and I believe am intake refresh is a relatively inexpensive way to eliminate a lot of issues and keep the engine running great after about 150k miles.

While I completely respect the "don't replace what isn't broken" mentality, I balance that against these other factors:

1. Some wear items, notably suspension, shifter bushings, and flex discs, wear gradually, like the frog dying in boiling water, and you don't get codes, or even visual signs when they are degrading. Replacing them after their useful lifespan is what I would call an "OE mod", as it will dramatically and noticeably improve performance.

2. Some, like sensors, will not throw codes even as they are past their useful lifespan, for example, 100-125k for O2 sensors or 150-175k for the MAF. They are maintenance items like oil and oil filters, and they just need to be replaced. I am certain that few here send their oil to be tested before every oil change. My lifespan numbers either come from the manufacturer (Bosch) or from direct experience diagnosing and solving P0171/4, P0303, and general lean conditions.

3. Certain projects are "while you are in there". The intake is a textbook example. You can replace the starter, CVV, and many other parts with the intake in. However, you can't replace the intake seal that way. Once you get the intake off, ALL of these projects become massively easier, and some difficult to diagnose problems become relatively easy - "Holy cow, that hose disintegrated in my hand!"

The entire project should cost about $550-800 for the intake, which is a few months' lease payments on a new car.

I will provide another guide for full refresh costs. I am attaching PDFs, but if anyone wants the underlying spreadsheets please private message "conversate" me and I can send it in Numbers or Excel. I have a guide for m56 as well - it is much simpler as there is no CVV.

OFHGOil filter housing gasket11421719855
1​
$‎ 9.09
OFHGVANOS oil feed line - Rein11361705532
1​
$‎ 27.99
OFHGOil temperature sensor13621433076
1​
$‎ 11.35
OFHGOil pressure sensor12618611273
1​
$‎ 8.99
CVVCVV Valve - BMW11617501566
1​
$‎ 23.99
CVVOil separator hose - valve cover to CVV11611432559
1​
$‎ 13.60
CVVOil separator hose - connecting hose to CVV11617504535
1​
$‎ 13.63
CVVBreather hose - Vent valve to dipstick tube11157532649
1​
$‎ 8.33
CVVBreather hose - Return - Oil separator hose to valve cover11617504536
1​
$‎ 12.99
SealsIntake manifold gasket - Elring11611436631
1​
$‎ 22.52
SealsDipstick lower o-ring - CRP11431740045
1​
$‎ 0.38
SealsEngine air distribution o-ring - Elring11617502761
6​
$‎ 5.94
SealsThrottle body gasket13547504729
1​
$‎ 4.44
SealsIntake air temp sensor o-ring13621743299
1​
$‎ 0.27
SealsDISA gasketGA-BM-DISA-ORING-M54-S
1​
$‎ 5.65
HoseUpper intake boot13541438761
1​
$‎ 20.74
HoseIntake lower boot13541438759
1​
$‎ 10.03
HoseVacuum hose - O2Pilot mod11657803732
1​
$‎ 30.09
O2Pilot ModSilicon vacuum hose - black - CRP11727545323
1​
$‎ 2.71
O2Pilot ModMercedes vacuum power adapter - O2Pilot mod1170780681
1​
$‎ 4.14
SensorCrankshaft position sensor12141709616
1​
$‎ 66.11
Hard lineBMW Coolant82141467704
1​
$‎ 20.00
Hard lineHeater hard line - inlet pipe11531705210
1​
$‎ 30.81
Hard lineCooling hard line - outlet pipe11537502525
1​
$‎ 40.85
OptionalCoolant plug07119904539
1​
$‎ 1.98
OptionalCoolant washer07119963200
1​
$‎ 0.18
OptionalFuel rail clip13537528539
1​
$‎ 0.00
OptionalInjector o-ring upper - BMW13641437487
2​
$‎ 10.00
OptionalGas hose clip13311716049
1​
$‎ 2.70
OptionalFuel tank breather line13907558190
1​
$‎ 42.60
OptionalStarter motorSR0448N
1​
$‎ 167.12
OptionalMAF sensor13627566983
1​
$‎ 197.30
OptionalIntake camshaft position sensor12147518628
1​
$‎ 36.00
OptionalExhaust camshaft position sensor12147539165
1​
$‎ 36.00
Fuel
OptionalFuel filter - Kayser13327512019
1​
$‎ 52.82
OptionalFuel pump - VDOVDO-228222009002Z
1​
$‎ 139.79
Optional12-20 hose clamps
4​
$‎ 5.00
Convertibles: Replace Steering Guibo at 100,000 miles.
 

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Premium Member
2003 330cic, 2003 325iT
Joined
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7,290 Posts
Discussion Starter · #7 ·
I was looking at the part numbers for the camshaft sensors, I think you have them reversed. I searched and the intake number came up as exhaust and vise versa. I wish I had known about the VNE sensors when I did the intake sensor on mine. Would have saved some cash.
Great catch! I changed the post and the attached PDF. I also forgot the VANOS crush washers (added)
 

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Premium Member
2003 330cic, 2003 325iT
Joined
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7,290 Posts
Discussion Starter · #8 · (Edited)

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Registered
BMW 325i 2001 Manual
Joined
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406 Posts
Subbing to this. I will need it soon. Thanks Archbid! Great guide. I got about 80 - 85% of this list done.

Just need to do the intake manifold gasket, coolant hard lines, both cam shaft position sensors and starter! (And find that pesky vacuum leak...)

My alternator actually started to show it’s age today, (not charging at start up) changing that when the new one comes in.

I have to ask, m3 engine mounts, I got the normal 325i ones from FCP are they not all that good? Are the m3 ones better? (More solid I assume).
 

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Premium Member
2003 330cic, 2003 325iT
Joined
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7,290 Posts
Discussion Starter · #10 ·
Subbing to this. I will need it soon. Thanks Archbid! Great guide. I got about 80 - 85% of this list done.

Just need to do the intake manifold gasket, coolant hard lines, both cam shaft position sensors and starter! (And find that pesky vacuum leak...)

My alternator actually started to show it’s age today, (not charging at start up) changing that when the new one comes in.

I have to ask, m3 engine mounts, I got the normal 325i ones from FCP are they not all that good? Are the m3 ones better? (More solid I assume).
M3 are more solid but if you are on a budget, I am not sure they add anything that will be noticeable.

You likely don't need to replace the whole alternator. If you remove the voltage regulator bolted to the back, you can inspect the brushes (the carbon sticks). If they are worn down, just replace the voltage regulator with a new one. Cheaper, just make sure you match to the type of alternator/plug you have.
 

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Registered
BMW 325i 2001 Manual
Joined
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406 Posts
M3 are more solid but if you are on a budget, I am not sure they add anything that will be noticeable.

You likely don't need to replace the whole alternator. If you remove the voltage regulator bolted to the back, you can inspect the brushes (the carbon sticks). If they are worn down, just replace the voltage regulator with a new one. Cheaper, just make sure you match to the type of alternator/plug you have.
Thanks!

Regarding the alternator, the brushes and bearings were shot too, not just the regulator, there wasn’t shaft play but there was grinding when spinning the pulley.

The valeo replacement was not too expensive, so I just got one at my local German import store.
 

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Premium Member
2003 330cic, 2003 325iT
Joined
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7,290 Posts
Discussion Starter · #12 ·
Thanks!

Regarding the alternator, the brushes and bearings were shot too, not just the regulator, there wasn’t shaft play but there was grinding when spinning the pulley.

The valeo replacement was not too expensive, so I just got one at my local German import store.
They import Germans? Why?
 

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Premium Member
2003 330cic, 2003 325iT
Joined
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7,290 Posts
Discussion Starter · #14 ·

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Premium Member
2003 330cic, 2003 325iT
Joined
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7,290 Posts
Discussion Starter · #15 ·
Posting from another thread. Question was asked whether one should replace the engine temperature sensor while the intake was removed:

The temperature sensor in the cylinder head is very reliable-no moving parts. All temperature sensors are thermistors. A thermistor is a resistor that changes resistance as its temperature changes. In the case of the temperature sensor in the cylinder head, it’s a negative coefficient sensor-its resistance goes down as its temperature increases.
 

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Thanks!
BTW, these part numbers are for a 330. I have the parts for M56 and 325 if anyone is interested.
Hey Archbid,
If you don't mind, tell me about your thoughts on the O2 Pilot Mod. I have looked into this, but have yet to try it. Is this only to combat oil consumption? Or are there other pros and cons? Have you had a car with it in place for years and 10's of thousands of miles?
Thanks!
 

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Premium Member
2003 330cic, 2003 325iT
Joined
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7,290 Posts
Discussion Starter · #18 ·
I installed the o2pilot mod 4/17. I had 1l per 1k miles oil issue at the time. From that point to 12/19, I drove 34k miles and had no oil required between 7,500 mile oil changes. I swapped to a ZHP engine 12/19.

Note, I also switched to Rotella oil at the time.

There were no downside issues, and I put the mod on the ZHP when I swapped.
 

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Premium Member
2003 330cic, 2003 325iT
Joined
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7,290 Posts
Discussion Starter · #19 ·
Yes, I am.
M56 parts:
O2 Sensor - pre-cat bank 1 - Bosch17175
O2 Sensor - pre-cat bank 2 - Bosch17176
Dipstick tube end upper o-ring - Reinz11437519850
Dipstick lower o-ring - CRP11431740045
DISA gasket
Oil filter housing gasket - Viton (from ECS Tuning)11421719855V
VANOS oil line crush washer - Rein (4 needed)94525114
VANOS oil feed line - Rein11361705532
Intake gasket - M56 (2 required)11617518036
Fuel injector lower o-rings (optional 6 needed)893.889
Crankshaft position sensor12141709616
Crankshaft position sensor o-ring12141748398
Oil pressure sensor12618611273
Oil temperature sensor13621433076
Crankcase vent hose (optional - gets brittle)11157513756

Cooling hard lines

Hard line - inlet - OEM11531705210
Hard line - outlet - REIN11537502525

Oil Pan
Oil level sensor - Hella (optional if yellow oil light)12617508003
Oil pan gasket11131437237
 

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Premium Member
2003 330cic, 2003 325iT
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7,290 Posts
Discussion Starter · #20 ·
325 parts:

928372
 
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