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Chirping noise on acceleration

2K views 1 reply 1 participant last post by  edwarde320 
#1 ·
2004 E320 4Matic Wagon.
About a month or so ago I started getting a gentle engine chirping noise on acceleration at certain pressures on the gas pedal. The noise SEEMS to track engine vacuum, not RPM or speed. It's also possible it's only happening in certain gears though I don't think so since I can get it to happen at 20 mph and 60 mph.

Searching in the forum led me to troubles with the fans (definitely not the problem) and the belt pulleys (very unlikely since it will only happen under load).

The noise is getting louder and more frequent but I can still only get it to happen during acceleration (even VERY gentle acceleration).

Does anyone have any ideas about this?

Thanks...
 
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