Exhaust flap motor actuator

29538 Views 57 Replies 22 Participants Last post by bigas0623, 9 d ago

2paczek

Discussion Starter · Oct 28, 2020

Hi everyone,
I heard the click noise sometimes from my exhaust flap and I think that spring has failed. The thing is , I’ve checked with the dealer and it’ll cost me round £300 to replace the whole motor. Now my car runs fine and this don’t trouble me much. Should I leave it or replace it what function does it have in my AMG Sport ( not performance) exhaust. Clicking is on idle not too loud.
car seems ok no loss of power from what I can tell. How do I check if it’s an actual issue with this actuator? I don’t know what to do. Would my engine etc be affected if I don’t change it provided it’s broken in the first place Thanks.

41 - 58 of 58 Posts

gbarringer

· #41 · Apr 23, 2022

Checking a USA MB parts supplier. The MSPR is $240. discounted at $216. This item number #9 in the diagram below.

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bbop

· #42 · 12 mo ago

ok so i have tried installing this motor and im not having much luck. (i just now thought maybe i need to plug it in and let it rotate) If i install it like it came the exhaust flap is open and the motor does not want to close. it does wiggle some but seem like its struggling to close in the morning ill try plugging it in and seeing if it rotates and stays. any help would be appreciated

Huey52

· #43 · 12 mo ago

Did you bench test it prior to installation? The actuator powers open (12V @ ~WOT) and spring closes the exhaust flap. So it "fails closed." Although a new part perhaps it's defective? The spring is usually the culprit as discussed earlier in this thread.

Did you procure the Benz or similar Audi part?

bbop said:
ok so i have tried installing this motor and im not having much luck. (i just now thought maybe i need to plug it in and let it rotate) If i install it like it came the exhaust flap is open and the motor does not want to close. it does wiggle some but seem like its struggling to close in the morning ill try plugging it in and seeing if it rotates and stays. any help would be appreciated

bbop

· #44 · 12 mo ago

Yes the spring broke this Is a new Benz assembly . I'm going to try plugging it in and cycling the key maybe the motor came in the flap open position

Huey52

· #45 · 12 mo ago

Again, you may be better served first bench testing it, even tho' a new part, with a 12VDC source to see that it properly electrically-opens with voltage applied and spring-closes with no voltage. Without voltage applied there is no way for the motor to hold it open. Unless again it's just a new-bad part, which although rare can happen.

In vehicle use it should only open the exhaust flap upon near wide-open throttle (WOT) so "cycling the key" won't tell you anything.

bbop said:
Yes the spring broke this Is a new Benz assembly . I'm going to try plugging it in and cycling the key maybe the motor came in the flap open position

bbop

· #46 · 12 mo ago

Yea im thinking it was shipped in the wot position so I'll ether plug it in and see if it moves which it should go to closed if its in the open poison or I'll get out the power probe

Reactions: 1

Huey52

· #47 · 12 mo ago

You may also want to look for a "shipping block" of some sort? Although when I acquired the similar Audi part it was already in the spring closed position and electrically activated just fine.

And of course you may want to use some WD-40 or other penetrant to assure the actual exhaust flap is freely moving.

bbop said:
Yea im thinking it was shipped in the wot position so I'll ether plug it in and see if it moves which it should go to closed if its in the open poison or I'll get out the power probe

bbop

· #48 · 12 mo ago

huey when you installed yours was it in the closed position?

bbop

· #49 · 12 mo ago (Edited)

ok so i marked where the spring was located and plugged it in. key on did nothing but once i started the car and gave it some throttle the motor turned in a different location than it was previously and stayed in that position. now with the flap in the closed position the motor bolts right up

Reactions: 1

Huey52

· #50 · 12 mo ago

Well done! I knew you'd work it out.

It was quite some time ago but I'm pretty sure I ensured the flap was already closed before engaging the new actuator (similar arrangement and part on an Audi TTS). I know I used penetrant to ease things along. After all, that exhaust flap and adjacent actuator live in a very harsh environment.

bbop said:
huey when you installed yours was it in the closed position?

bbop said:
ok so i marked where the spring was located and plugged it in. key on did nothing but once i started the car and gave it some throttle the motor turned in a different location than it was previously and stayed in that position. now with the flap in the closed position the motor bolts right up

Mark01

· #51 · 12 mo ago

Hi need to replace the actuator on my exhaust flap on my 2015 CLA220 should the flap be open or closed?

bbop

· #52 · 12 mo ago

It's normal position is closed and while installing the new one should be closed

Reactions: 1

VoodooJC

· #53 · 5 mo ago

Dealer wanted $1600 (WTF??!

) to replace my actuator, so I did some more Googling and found out this exact same actuator is used in many brands of cars from Audi to Kia to Dodge. Then I found out Mopar sells just the replacement spring for around $30-$40. I ordered off of eBay, but it's available just about anywhere, including your local Dodge dealers if you're in a hurry. Just got it in today and it's an identical replacement. Part number is 68319331AA.

Hope this helps someone!

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sam45AMG

· #54 · 5 mo ago

Great find! Thanks VoodooJC! Made in Germany possibly indicates that the original manufacturer of the actuator sells just the spring. Glad to know where I can get it here in the states besides Audi and MB!

Huey52

· #55 · 5 mo ago

Good find indeed. This further demonstrates that we all have "world cars" these days. Now we know MB, Audi and Mopar labeled are actually the same part, and likely many others. Mopar is of course historically Chrysler (now Netherlands Stellantis) but part made in Germany.

btw: my prior Miata had a number of Ford parts, but of course Ford had a financial interest in same. Similar to when Daimler ran Jeep.

VoodooJC said:
Dealer wanted $1600 (WTF??! ) to replace my actuator, so I did some more Googling and found out this exact same actuator is used in many brands of cars from Audi to Kia to Dodge. Then I found out Mopar sells just the replacement spring for around $30-$40. I ordered off of eBay, but it's available just about anywhere, including your local Dodge dealers if you're in a hurry. Just got it in today and it's an identical replacement. Part number is 68319331AA.

Hope this helps someone! View attachment 28106

Huey52

· #56 · 5 mo ago

Mark01 said:
Hi need to replace the actuator on my exhaust flap on my 2015 CLA220 should the flap be open or closed?

=========
Prior insight same thread:

Huey52 said:
Did you bench test it prior to installation? The actuator powers open (12V @ ~WOT) and spring closes the exhaust flap. So it "fails closed." Although a new part perhaps it's defective? The spring is usually the culprit as discussed earlier in this thread.

Did you procure the Benz or similar Audi part?

Huey52 said:
Again, you may be better served first bench testing it, even tho' a new part, with a 12VDC source to see that it properly electrically-opens with voltage applied and spring-closes with no voltage. Without voltage applied there is no way for the motor to hold it open. Unless again it's just a new-bad part, which although rare can happen.

In vehicle use it should only open the exhaust flap upon near wide-open throttle (WOT) so "cycling the key" won't tell you anything.

bigas0623

· #57 · 9 d ago

Matt65 said:
Yes . Nobody sale the spring alone. Like I said. Mercedes actuator with spring is 350euros . Audi/vw ref for exactly the same thing 100 euros.

I found Germans do replacement spring only €30 bought just to see and it works https://asr-component.de/gb/begin/92-stiff-clutch-spring-sister.html

Reactions: 1

bigas0623

· #58 · 9 d ago

firx11 said:
i pulled the actuator today on my '15 gla45 and found this:

View attachment 26781

i knew it was bad when the nuts holding it on looked like this:

View attachment 26782

i went ahead and ordered the audi actuator, lol. thanks in advance for finding that - didn't want to have to give up a left kidney for the mb one.

https://asr-component.de/gb/begin/92-stiff-clutch-spring-sister.html

Reactions: 1

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