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      03-07-2012, 12:13 PM   #1
Randomaccess335
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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
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      03-07-2012, 12:20 PM   #2
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Wg solenoids?
Do you get it as soon as you give throttle or sometimes? Can you log wg dc?
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      03-07-2012, 12:41 PM   #3
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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.
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      03-07-2012, 01:19 PM   #4
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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
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      03-07-2012, 01:33 PM   #5
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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
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      03-07-2012, 01:34 PM   #6
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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
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      03-07-2012, 01:36 PM   #7
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Quote:
Originally Posted by Randomaccess335 View Post
Not sure if I can log the WG with jb4
I'm pretty sure you can
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      03-07-2012, 01:44 PM   #8
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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.
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      03-07-2012, 01:47 PM   #9
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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?
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      03-07-2012, 01:49 PM   #10
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Quote:
Originally Posted by Randomaccess335 View Post
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.
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      03-07-2012, 02:15 PM   #11
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Quote:
Originally Posted by marv85
Quote:
Originally Posted by Randomaccess335 View Post
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
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      03-07-2012, 02:20 PM   #12
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Quote:
Originally Posted by Randomaccess335 View Post
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.
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      03-07-2012, 02:32 PM   #13
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Just got e mail for terry bout map 4
Thanks also,
R
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      03-07-2012, 04:21 PM   #14
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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.
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      03-08-2012, 02:57 PM   #15
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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
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      01-19-2013, 11:20 AM   #16
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Did you ever figure out the issue????
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      02-22-2013, 07:50 PM   #17
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would a bad waste gate cause the siren sound, zero boost, and 30FF?
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