190E Hesitates/Surges Until warmed up.......Suspect Air Intake/Breather Hose - Mercedes-Benz Forum

 
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post #1 of 7 (permalink) Old 07-18-2009, 05:17 AM Thread Starter
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Smile 190E Hesitates/Surges Until warmed up.......Suspect Air Intake/Breather Hose

I have a 190e with 218,000 miles that hesitates until it is warmed up. I'm suspecting it has to do with a cracked air intake/ breather hose going from valve cover to air filter, My question is I noticed what looks like a small vacuum tube coming from the side of it. It has cracked and broken off. Can anyone tell me what function this particular hose/tube serves? Thanks for your help in advance.
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post #2 of 7 (permalink) Old 07-18-2009, 09:42 AM
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Cold engine requires a richer than usual fuel mixture to run properly.

On yours, this is accomplished via temperature sensor and computer which activate cold start injector and idle control valve.

Vacuum leaks indeed defeat the purpose--doesn't matter what function of any line is, it must be connected and not leaking. This is indeed first thing to fix. NOTHING there is something that is not needed nor something that doesn't matter.

Kent Christensen
Albuquerque
'07 GL320CDI
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post #3 of 7 (permalink) Old 07-18-2009, 10:21 AM Thread Starter
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Thanks for the response Kent. I will be replacing the cracked air intake breather hose from the valve cover to air filter. I'm having a hard time finding this rubber coated tubing that runs from the little hole on this air intake/breather hose to who knows where. I haven't had the chance to look yet. Any suggestions on where I may find this part or what it's called? I do frequent Autohausaz a bit and couldn't find it listed. Thanks again.
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post #4 of 7 (permalink) Old 07-18-2009, 11:09 AM Thread Starter
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Here are the pics for my 190e 2.6 in what I'm referring to. I checked my manual and can find nothing of this piece either. Thanks
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Last edited by rdoepker; 07-18-2009 at 11:12 AM. Reason: Photos didn't upload properly
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post #5 of 7 (permalink) Old 07-18-2009, 08:20 PM Thread Starter
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I did end up solving this mystery of mine. The vacuum line goes to the fuel pressure regulator. It provides vacuum to the fuel pressure regulator diaphragm. Now I just got to find this rubber grommet vacuum piece I heard the part is only around $5.00 - $6.00 bucks. Anyone know what this part is called or have a part #?
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post #6 of 7 (permalink) Old 07-20-2009, 12:04 AM
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It doesnt matter. Mine was broken and I drove it for many months with zero problems. My MB mechanic even told me to not worry about it. Its for the engine to breath. No big deal. He was right.

There is one rule...there are no rules!
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post #7 of 7 (permalink) Old 07-20-2009, 06:54 PM Thread Starter
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Well that's good to know. I did end up finding the vacuum connector I needed from autohausaz. Part # 1298050444
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