Please Help! 2009 R320 Bluetec limp mode w/codes - Page 2 - Mercedes-Benz Forum
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post #11 of 30 (permalink) Old 01-05-2016, 06:54 AM
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Thanks for the quick response Danosll,

The engine sounds like when there is a big exhurst leack, but its all from the engine area not outside or back of car.

Today I intend to clear all the codes with a scan tool , let the engine run , cheak for leaks around hoses as you said , and see what code comes back.

Please, Other opinions and suggestion are welcome
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post #12 of 30 (permalink) Old 01-05-2016, 07:25 AM
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Check the rubber air hoses from intercooler about a 2" diameter. One on top one on bottom. You should be able to pinpoint leak while engine is running follow the sound. Check lower first
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post #13 of 30 (permalink) Old 01-05-2016, 08:34 AM
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I'll pay extra attention but there is no hissing noise to follow
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post #14 of 30 (permalink) Old 01-05-2016, 04:02 PM
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Update-

Cleared all codes and got it out of limp-

Start car and idle for a few minutes ,
Drove only about 200meters and car went back in limp.

Two codes came back
P0404

P0471

Plus I was able to isolate the leak sound to the front left side (pasenger) by the big hose to at the intercooler. I can hear it a bit to the right side too but more to the passenger side.
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post #15 of 30 (permalink) Old 01-05-2016, 04:27 PM
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You will probably find that the hose has burst. It might be oily around the hole. Try sqeezing it or just remove it entirely to inspect it. Not sure of your year but later models 2010+ are just clips that pop off with a screw driver. Earlier has a gear clamp on one end
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post #16 of 30 (permalink) Old 01-05-2016, 04:37 PM
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Or build a pressue tester . take a 1/4 " thick piece of plexi or aluminium. Using the appropriate size holesaw cut out a piece the same size as your intake at turbo (where air box attaches to turbo ) . tap pilot hole made by holesaw to accept Schrader valve. Using an apropriate size hose and 2 gear clamps clamp your tester in front of turbo supply approx @15psi of air with a tire chuck . if hole isn't instantly visible .spray soapy solution all around till you find leak. Almost identical to tool MB dealers use
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post #17 of 30 (permalink) Old 01-09-2016, 08:18 AM
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Update-
No boost from turbocharger, back to MB for a replacement.
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post #18 of 30 (permalink) Old 01-09-2016, 09:06 AM
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Quote:
Originally Posted by Benzzaa View Post
Update-

Cleared all codes and got it out of limp-

Start car and idle for a few minutes ,
Drove only about 200meters and car went back in limp.

Two codes came back
P0404

P0471

Plus I was able to isolate the leak sound to the front left side (pasenger) by the big hose to at the intercooler. I can hear it a bit to the right side too but more to the passenger side.
unlikely its the turbo itself . computer wont allow it to produce boost(via the waste gate) if it detects other problem and goes into limp mode.
simple way to verify turbo is to remove airbox and duct at turbo (just a gear clamp) you will clearly see impeller. turn it with your finger, should turn freely and be free from oil and no bent or boken blades .
have you eliminated an air leak as probable cause?
those 2 new codes are egr related so check for exhaust leak. maybe dirty egr. but unlikely the turbo itself
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post #19 of 30 (permalink) Old 01-09-2016, 09:35 AM
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I correct myself the car never went in limp at anytime.
Not enough power coming from the engine to shift tranny.

I remember about a yr ago on a trip, the car lost power and speed dropped and i turned of the engine , restart and everything was fine till now.
My question is could it be the faulty exhaust back pressure sensor that overworked the turbo overtime?

And how come such delicate part of the engine dose not throw CEL

Probably a good idea to scan car regularly for codes
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post #20 of 30 (permalink) Old 01-09-2016, 11:15 AM
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Quote:
Originally Posted by Benzzaa View Post
I correct myself the car never went in limp at anytime.
Not enough power coming from the engine to shift tranny.

I remember about a yr ago on a trip, the car lost power and speed dropped and i turned of the engine , restart and everything was fine till now.
My question is could it be the faulty exhaust back pressure sensor that overworked the turbo overtime?

And how come such delicate part of the engine dose not throw CEL

Probably a good idea to scan car regularly for codes
highly unlikely it is turbo
you can perform a quick test of 118900 ex press sensor see photo.
and charge sensor 123900 see photo
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