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#1
09-22-2018, 01:27 PM
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Mild Whistling Sound W124
91 300D. Start the car, everything sounds perfectly normal at idle. But, as I begin to drive at a low speed there is a mild whistling sound, whether or not my foot is on the accelerator. After 10-15 minutes of driving, it completely goes away.
Any ideas?
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
09-22-2018, 01:30 PM
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Idea: vacuum leaking somewhere
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Current fleet 2006 E320 CDI 1992 300D - 5speed manual swapped former members 1984 300D "Blues Mobile" 1978 300CD "El Toro"
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#3
09-22-2018, 01:43 PM
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Quote:
I opened hood and moved throttle above idle, but can't hear it. It's only when I'm moving.
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#4
09-22-2018, 01:49 PM
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If you can duplicat the sounde when it is not moving it is going to be tough to find it.
However, check the conditions of your belts and their tension. The Vacuum leak couls be inside.
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84 300D, 82 Volvo 244Gl Diesel
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#5
09-22-2018, 02:04 PM
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Could it be that the heat of the engine compartment seals the vacuum leak after a while?
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14 E250 Bluetec "Sinclair", Palladium Silver on Black, 153k miles 06 E320 CDI "Rutherford", Black on Tan, 171k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver, 142k mi, wastegate conversion 19 Honda CR-V EX 61k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife Last edited by shertex; 09-22-2018 at 02:17 PM.
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#6
09-22-2018, 08:04 PM
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Disconnect and cap the vacuum line to the ACC and rear headrest switch at the firewall. Does that do anything to the whilstling sound? Can you try the same with the engine shutoff vacuum supply line?
Sixto 98 E320s sedan and wagon 02 C320 wagon
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#8
09-23-2018, 07:21 AM
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Exaust manifold gasket on the way out.But when its warm it fills the gap as it expands . or inlet manifold gasket ..
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