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-   -   '97 E300D surges. Resonance Flaps or EGR valve (http://www.peachparts.com/shopforum/tech-help/68073-97-e300d-surges-resonance-flaps-egr-valve.html)

jessie_eaton 06-19-2003 11:07 PM

'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?

LarryBible 06-20-2003 06:38 AM

Resonance flaps get 99% probability. Been there, done that. Cleaning will do very little.

Good luck,

jessie_eaton 06-23-2003 07:58 AM

Thank you Larry for sharing your experience. I will replace the resonance flappers if the problem persists.

joe p 06-23-2003 04:02 PM

There also is a resistor install in the map sensor that'll fix em.



Joe


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