My 300D 2.5T sounds like somebody is strangling a rat under the hood under hard acceleration. The sound doesn't gradually increase in volume, it comes on abruptly as soon as I give it more than about 1/3 of the pedal travel. I popped the hood and reved the engine in park, and I'm 99% sure it's coming from the vacuum actuator for the EGR valve. When the hood is open, it's pretty loud, louder than anything else that makes noise under the hood. With no load on the engine, it comes on at about 3500-4000RPM, but it starts at around 2200 when driving, but only when the go pedal is at about 1/3. Before this started happening, there was a little whistle that starts under the same circumstances. The whistle doesn't sound like turbo whine. It starts when the ALDA starts giving the engine more fuel. The car never wistled before I cleaned out the ALDA lines...but before that it was agonizingly slow (0-60 in about 18).

Any ideas? Bad EGR solenoid?

__________________
Dale

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1990 300D 2.5 Turbo -155k
2000 E430 - 103k
2014 Jeep Grand Cherokee Ecodiesel 4x4 - 11k
2014 VW Passat TDI SE - 7k Bro's Diesel
2006 E320 CDI - 128k Pop's Benz

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