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  #1  
Old 06-20-2003, 12:07 AM
What's that noise?
 
Join Date: Jun 2003
Location: Alabama
Posts: 82
Angry '97 E300D surges. Resonance Flaps or EGR valve

My '97 E300D surges and the tachometer ossilates up and down. I cleaned the resonance flaps with carb. cleaner normally used for a gas engine. Hope that was ok. Anyway, the resonance flaps are clean and problem persists.

Next, I disconnected the vacuum to the EGR valve to disable the valve. The car ran GREAT.

But with the EGR valve disabled, I noticed that the computer tells one of the resonance flappers (the one located between the EGR valve and the inlet air filter) to default to wide open and the check engine light comes on.

I checked the operation of the EGR valve with a vacuum pump. The valve works fine. Maybe it's the EGR sender?

Any thoughts?
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1997 E300D - naturally aspirated
280,000 miles (as of November 2015)
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  #2  
Old 06-20-2003, 07:38 AM
LarryBible
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Resonance flaps get 99% probability. Been there, done that. Cleaning will do very little.

Good luck,
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  #3  
Old 06-23-2003, 08:58 AM
What's that noise?
 
Join Date: Jun 2003
Location: Alabama
Posts: 82
Thank you Larry for sharing your experience. I will replace the resonance flappers if the problem persists.
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1997 E300D - naturally aspirated
280,000 miles (as of November 2015)
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  #4  
Old 06-23-2003, 05:02 PM
it leaks, its german
 
Join Date: Mar 2002
Location: raleigh nc
Posts: 1,111
There also is a resistor install in the map sensor that'll fix em.



Joe
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