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  #1  
Old 09-02-2004, 11:33 PM
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Join Date: Sep 2000
Location: Minneapolis, MN USA
Posts: 341
Is this the wastegate? How to clean?

Hey all,

Some great threads recently about lack of boost!! This spured me to check my wastegate as I'm experiencing a little less bost then usual lately. I did some searches and still have two basic questions... Sorry, I've never looked into a turbocharged car this deeply before.

Please view the attached picture. Is the gold thing under the red dot the wastegate? I believe the gold thing above the dot is the EGR unit.

My car is a 1992 300D 2.5 turbo.

Finally, if this is the part, how does one clean it? I lubed the ball and socket joints on the lever and blew into the vacuum hose and it's clear to the other end of it. Can't find an obvious way into the unit itself. Suggestions appreciated!

I used to see more accelleration at 2000 rpms and now I get the amount I'd expect later at 2400rpms. I suspect my wastegate might be releasing some boost. I also have major turbo lag. If I keep a solid pedal at 2400rpm, the mph will increase for about 20 miles per hour while the rpms stay constant. Kinda weird.

Thanks much!!

-m

PS: Love the new forum software with easier file attachments!!

PPS: My 0-60 is 13.8 seconds, just went out and tested it. 72 degree evening, low humidity, engine temp gauge at 80, full tank of #2 fuel.

Attached Thumbnails
Is this the wastegate? How to clean?-wastegate.jpg  
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Now:
2018 Tesla Model X
1999 S500 Grand Edition 164k
1992 300D 2.5 Turbo 287k
2005 E320 4MATIC wagon
1991 Alfa Romeo 164L 99k (sleeping for a while)

Then: 96 Lincoln TC, 93 Lincoln TC, 87 560 SEL, 87 300 SDL, 80 300D, 89 560 SEC

Last edited by invisik; 09-03-2004 at 12:00 AM.
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  #2  
Old 09-03-2004, 01:07 AM
sixto's Avatar
smoke gets in your eyes
 
Join Date: Jun 2000
Location: Eastern TN
Posts: 20,841
Do a search on cleaning the ALDA signal line.

Sixto
95 S420
87 300SDL
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  #3  
Old 09-03-2004, 01:21 AM
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Join Date: Oct 2002
Posts: 463
no, thats not the wastegate, thats the intake control flap, or whatever its called. the wastegate is on the actual housing of the turbo, on the bottom of the exhaust side of it. its a small valve integral to the turbo and has a vacuum element linked to it. i think you have to take the turbo out of the car to really clean it.
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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350
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  #4  
Old 09-03-2004, 11:16 AM
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Join Date: Jan 2002
Location: colorado
Posts: 154
Boost control

I have had three 300D all 93s, the problem with your car is typical. Boost is MANAGED by numerous inputs to a computer, the quickest way to solve the problem is to find a good mechanic that can pull the codes and do the four pages of diagnostics. There are maybe half dozen pnematic relays that can cause a reduction in boost, if the computer gets a bad signal from any input it will reduce or eliminate boost all together, limp home mode.
Been there done that.
Ron

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