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I have the same issue on my 190E. I thought it was the timing chain, but after further investigation and a new tensioner installed I have found that it is actually my water pump pulley. Either the pulley is loose on mine or the bearings are starting to fail. I can move my pulley a few Milimeters! Check the water pump and all pulleys for slight wobble.
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~Jamie
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2003 Pewter C230K SC C1, C4, C5, C7, heated seats, CD Changer, and 6 Speed. ContiExtremes on the C7's.
1986 190E 2.3 Black, Auto, Mods to come soon.....
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