How check waste gate operation - BMW 3-Series (E90 E92) Forum

Randomaccess335 · 03-07-2012, 12:13 PM

I've been searching but not finding a way to check if my waste gates are sticking open
I have other threads about my low boost issue

Did boost leak test
I don't think I have vacuum leak
Checked all connections

I'm running out of things to check so now I'm looking at the waste gates
Ty,
R

enrita · 03-07-2012, 12:20 PM

Wg solenoids?
Do you get it as soon as you give throttle or sometimes? Can you log wg dc?

Joshboody · 03-07-2012, 12:41 PM

couple things to check if you think there's a hardware issue. I think you had another post about vacuum.
1. check vacuum lines from oil cap to after vacuum canisters. I do this by disconnecting at oil cap and WG solenoid in, apply about 15" from a vacuum pump and see if it bleeds off. Just cap the other side with you finger.
2. Now check post WG solenoid by disconnecting both solenoid outs, capping one (I use finger) and pump up to about 15" and check for bleed off (vacuum decreasing).
3. While on step 2 you can visually check WG movement. Top of the car for rear and bottom for front. Just make sure it's smooth. you can observe max vacuum to close rear and kinda judge this same movement length with the front.
4. Next start the car and check vacuum reading from pump... disconnect from vacuum canister and check. maybe around 25" hg
5. with car started you can check post solenoid. I do each separately and then together... if the reading from both are equal then probably good. You do need some WGDC to check this though. most are around 60% tuned as default.
7. check the exhaust flapper to see if any leaks by applying a vacuum

After everything above checks out, do a boost leak test. you mentioned you did this already. Sniz has a good DIY using a 2" pvc cap on the IC hot side. 20psi is sufficient.

hope this helps.

Randomaccess335 · 03-07-2012, 01:19 PM

Wow lots of good info
Thanks

I did the leak test w/PVC cap at 25psi
No leaks found
I'll have to get a vac pump tomorrow and get started
Ty,
R

Randomaccess335 · 03-07-2012, 01:33 PM

Quote:

Originally Posted by enrita

Wg solenoids?
Do you get it as soon as you give throttle or sometimes? Can you log wg dc?

I have low boost all the time no codes thrown

Randomaccess335 · 03-07-2012, 01:34 PM

Quote:

Originally Posted by enrita

Wg solenoids?
Do you get it as soon as you give throttle or sometimes? Can you log wg dc?

Not sure if I can log the WG with jb4

marv85 · 03-07-2012, 01:36 PM

Quote:

Originally Posted by Randomaccess335

Not sure if I can log the WG with jb4

I'm pretty sure you can

enrita · 03-07-2012, 01:44 PM

if you get low boost constantly and pressure/smoke test is fine than one of your WG is fucked and you need a new turbo.

Randomaccess335 · 03-07-2012, 01:47 PM

Quote:

Originally Posted by enrita

if you get low boost constantly and pressure/smoke test is fine than one of your WG is fucked and you need a new turbo.

If thats the case how would I tell the dealer about it?

marv85 · 03-07-2012, 01:49 PM

Quote:

Originally Posted by Randomaccess335

If thats the case how would I tell the dealer about it?

do you get low boost when on stock map? Just remove maps and dealer it.

Randomaccess335 · 03-07-2012, 02:15 PM

Quote:

Originally Posted by marv85

Quote:

Originally Posted by Randomaccess335

If thats the case how would I tell the dealer about it?

do you get low boost when on stock map? Just remove maps and dealer it.

Never thought of logging map 0 cause I assumed it disabled logging also

marv85 · 03-07-2012, 02:20 PM

Quote:

Originally Posted by Randomaccess335

Never thought of logging map 0 cause I assumed it disabled logging also

Map4 is stock map, and CAN enabled so you get to log.

Randomaccess335 · 03-07-2012, 02:32 PM

Just got e mail for terry bout map 4
Thanks also,
R

JamesM3M5 · 03-07-2012, 04:21 PM

If you have a hand-help vacuum pump such as a Mityvac, you can pull vacuum on the WGAs and watch the rods move. The front WG rod is nearly impossible to see - much less touch or remove - without pulling a couple of things apart. The rear you can see easily.

I've seen one turbo where the WG pivot arm that goes into the turbine housing was so worn and sloppy that it bound up. When vacuum was applied, the WGA rod would move about 2-3mm and stick. If I stuck a prybar on it and gave it a shove, it would work. Only solution was a new turbo.

Randomaccess335 · 03-08-2012, 02:57 PM

Jb4 map 4 log boost maxed out 7.4 and supposed to be 8.8 I think.

All other maps way under target....... It's going to the dealer I guess and stock dp's go back on

Bme30 · 01-19-2013, 11:20 AM

Did you ever figure out the issue????

psu139 · 02-22-2013, 07:50 PM

would a bad waste gate cause the siren sound, zero boost, and 30FF?

03-07-2012, 12:13 PM	#1
Randomaccess335 Lieutenant Drives: 07' 335I Join Date: Mar 2011 Location: boynton beach, Fl Posts: 596 iTrader: (9)	How check waste gate operation I've been searching but not finding a way to check if my waste gates are sticking open I have other threads about my low boost issue Did boost leak test I don't think I have vacuum leak Checked all connections I'm running out of things to check so now I'm looking at the waste gates Ty, R __________________ JB4 G5 ISO , BMS DCI's, Stock Guted DP's, DO Meth kit Trunk Mount, ETS 5" Intercooler, M6 Rims, ER Charge Pipe, Fordged DV's Cybe 3.8" chrome Tips, Lux Angel Eyes ********12.07 @ 1161.99 60'*********
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03-07-2012, 12:20 PM	#2
enrita Major General Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden Posts: 6,831 iTrader: (0)	Wg solenoids? Do you get it as soon as you give throttle or sometimes? Can you log wg dc? __________________ 07 335i AT - TD St.2 Turbos - COBB (Custom Cobb mapping by http://www.protuningfreaks.com/) - JB4G5 ISO - Okada Coils - NGK 5992 Plugs - E85 Walbro - Injen Intake - Helix IC - Snow Stg. 3 - Stett CP - AR DPs - midpipes 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - Level 10 AT upgrade - Alpina AT Flash

03-07-2012, 01:19 PM	#4
Randomaccess335 Lieutenant Drives: 07' 335I Join Date: Mar 2011 Location: boynton beach, Fl Posts: 596 iTrader: (9)	Wow lots of good info Thanks I did the leak test w/PVC cap at 25psi No leaks found I'll have to get a vac pump tomorrow and get started Ty, R __________________ JB4 G5 ISO , BMS DCI's, Stock Guted DP's, DO Meth kit Trunk Mount, ETS 5" Intercooler, M6 Rims, ER Charge Pipe, Fordged DV's Cybe 3.8" chrome Tips, Lux Angel Eyes ********12.07 @ 1161.99 60'*********

03-07-2012, 01:44 PM	#8
enrita Major General Drives: 335i - Big turbos Join Date: Sep 2008 Location: Italian in Sweden Posts: 6,831 iTrader: (0)	if you get low boost constantly and pressure/smoke test is fine than one of your WG is fucked and you need a new turbo. __________________ 07 335i AT - TD St.2 Turbos - COBB (Custom Cobb mapping by http://www.protuningfreaks.com/) - JB4G5 ISO - Okada Coils - NGK 5992 Plugs - E85 Walbro - Injen Intake - Helix IC - Snow Stg. 3 - Stett CP - AR DPs - midpipes 100 HJS Cats - Bastuck Quad - PSS10 - QUAIFE LSD - BMS OCC - Forge DVs - AR OC - ALCON BBK - M3 Chassi - Dinan CP - Velocity M rear Toe arms - Advan RZ-DF - Level 10 AT upgrade - Alpina AT Flash

03-07-2012, 02:32 PM	#13
Randomaccess335 Lieutenant Drives: 07' 335I Join Date: Mar 2011 Location: boynton beach, Fl Posts: 596 iTrader: (9)	Just got e mail for terry bout map 4 Thanks also, R __________________ JB4 G5 ISO , BMS DCI's, Stock Guted DP's, DO Meth kit Trunk Mount, ETS 5" Intercooler, M6 Rims, ER Charge Pipe, Fordged DV's Cybe 3.8" chrome Tips, Lux Angel Eyes ********12.07 @ 1161.99 60'*********

03-07-2012, 12:41 PM	#3
Joshboody Lieutenant Colonel Drives: 2008 BMW 335i E90 6MT v5 Join Date: Jul 2009 Location: Phoenix, AZ Posts: 1,545 iTrader: (7)	couple things to check if you think there's a hardware issue. I think you had another post about vacuum. 1. check vacuum lines from oil cap to after vacuum canisters. I do this by disconnecting at oil cap and WG solenoid in, apply about 15" from a vacuum pump and see if it bleeds off. Just cap the other side with you finger. 2. Now check post WG solenoid by disconnecting both solenoid outs, capping one (I use finger) and pump up to about 15" and check for bleed off (vacuum decreasing). 3. While on step 2 you can visually check WG movement. Top of the car for rear and bottom for front. Just make sure it's smooth. you can observe max vacuum to close rear and kinda judge this same movement length with the front. 4. Next start the car and check vacuum reading from pump... disconnect from vacuum canister and check. maybe around 25" hg 5. with car started you can check post solenoid. I do each separately and then together... if the reading from both are equal then probably good. You do need some WGDC to check this though. most are around 60% tuned as default. 7. check the exhaust flapper to see if any leaks by applying a vacuum After everything above checks out, do a boost leak test. you mentioned you did this already. Sniz has a good DIY using a 2" pvc cap on the IC hot side. 20psi is sufficient. hope this helps.

03-07-2012, 04:21 PM	#14
JamesM3M5 Some dude Drives: E28 M5, E92 335i Join Date: Sep 2011 Location: Northern VA Posts: 1,569 iTrader: (0)	If you have a hand-help vacuum pump such as a Mityvac, you can pull vacuum on the WGAs and watch the rods move. The front WG rod is nearly impossible to see - much less touch or remove - without pulling a couple of things apart. The rear you can see easily. I've seen one turbo where the WG pivot arm that goes into the turbine housing was so worn and sloppy that it bound up. When vacuum was applied, the WGA rod would move about 2-3mm and stick. If I stuck a prybar on it and gave it a shove, it would work. Only solution was a new turbo. __________________ RRT Racing E92 335i/6MT Dinan Stage 3 intercooler, oil cooler, intake, flash. E28 M5, R171 SLK350

03-08-2012, 02:57 PM	#15
Randomaccess335 Lieutenant Drives: 07' 335I Join Date: Mar 2011 Location: boynton beach, Fl Posts: 596 iTrader: (9)	Jb4 map 4 log boost maxed out 7.4 and supposed to be 8.8 I think. All other maps way under target....... It's going to the dealer I guess and stock dp's go back on __________________ JB4 G5 ISO , BMS DCI's, Stock Guted DP's, DO Meth kit Trunk Mount, ETS 5" Intercooler, M6 Rims, ER Charge Pipe, Fordged DV's Cybe 3.8" chrome Tips, Lux Angel Eyes ********12.07 @ 1161.99 60'*********

01-19-2013, 11:20 AM	#16
Bme30 Lieutenant Drives: 335i coupe Join Date: May 2010 Location: wellington Posts: 567 iTrader: (1) Garage List 2007 335i [0.00]	Did you ever figure out the issue????

02-22-2013, 07:50 PM	#17
psu139 First Lieutenant Drives: 335i Sedan Join Date: Apr 2007 Location: Florida Posts: 308 iTrader: (1)	would a bad waste gate cause the siren sound, zero boost, and 30FF?

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