E-Class (W124) 1984-1995: E 260, E 300, E 320, E 420, E 500 (Includes CE, T, TD models)

Need help please Code 23

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Old Feb 20, 2012 | 11:42 PM
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1994 E320
Need help please Code 23

Hi all, I just bought a 1994 e320, Great car and ive been searching these forums often to help me, Since i bought the car a week ago ive put a new k&N air filter , New bosch fuel filter , New bosch copper spark plugs, New plug wires.....

But the car still feels Sluggish at times ...other times it feels like a beast and flys....So from reading here i located the onboard diagnostics and it blinked 23 times . I dont know what pin 8 or pin so and so mean my car under the hood has
a built in led and a button and it blinked 23 times .......

So my question is what should i look at to fix this ..any 1 had this problem in the past?
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Old Feb 21, 2012 | 11:21 PM
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no clues anybody? guess ill take 2 dealer...ive searched but cant find any resolution to this code. Thanks ne way
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Old Feb 22, 2012 | 01:48 AM
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1990 300ce 24v I6
You've got the California diagnostics terminal, you're going to have to find the manual that deals with that specifically.
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Old Feb 22, 2012 | 07:57 AM
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Thanks Buddy . this is what i found

http://www.w124performance.com/docs/..._W124_M104.pdf

So 23 flashes according to this guide is

Intake manifold pressure (in base module pressure sensor- B5/2) with engine
running too low/high


So what does this mean?
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Old Feb 22, 2012 | 02:26 PM
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1990 300ce 24v I6
Originally Posted by Bru023
Intake manifold pressure (in base module pressure sensor- B5/2) with engine
running too low/high

So what does this mean?
That is the question indeed. I'd guess (guess mind you, nothing more) that you may have an intake manifold gasket leak. I don't know how you'd go about testing/verifying that however. Should be something on the forum you can search for and get better info.
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Old Feb 22, 2012 | 09:38 PM
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im thinking check it like you would a tire leak spray some water around seal and bolts and look 4 bubbles, IDK....

I really want to bring this car to life then get some pics up. But before i upgrade cosmeticly i want to make sure the engine is running good.

Thanks for your help Saijin_Naib
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Old Feb 26, 2012 | 09:32 AM
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So after some research im guessing its the Map sensor or the voltage going to it. or the vaccum line leading from it
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Old Feb 26, 2012 | 10:51 PM
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1990 300ce 24v I6
Well, that isn't TOO much to test right?
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Old Feb 28, 2012 | 08:18 AM
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not much but i dont even know how to test voltage and Vacuum leak can be anywhere ...but ill try
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Old Apr 1, 2012 | 09:07 AM
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so i figure ide post my results to help others in the future after 1 mechanic told me it was my EGR causing the code 23....And tons of others suggesting a vacuum leak ......
I replaced the egr cost 250$ did it myself, Mechanic wanted 500$....Did not fix problem ...

Brought it to my friends mechanic ended up being simple easy Map sensor

100$ part code is gone .....

Now after trying egr tube clean and replacing egr valve car starts and stalls 10 seconds later ...if i gas it when it wants to stall car stays running and works fine until next restart it wants to stall again ....any ideas?
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Old Jan 1, 2022 | 09:56 PM
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1995 Mercedes E320 Coupe
Checking for intake manifold leak

Originally Posted by Bru023
im thinking check it like you would a tire leak spray some water around seal and bolts and look 4 bubbles, IDK....

I really want to bring this car to life then get some pics up. But before i upgrade cosmeticly i want to make sure the engine is running good.

Thanks for your help Saijin_Naib

I would recommend spraying around the manifold with brake cleaner or carb cleaner
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