My 1999 E300D is emitting a whining high-pitched noise from under the dash when the accelerator pedal hits a certain position, approximately 2/3rd of the way down in its travel.

The sound is similar to the sound that an air or vacuum slight leak might make, it's almost like a whistling horn type sound.

This only happens as stated when the pedal is at about 2/3rds, below 2/3rds or beyond the noise stops.

Anyone have any idea as to what this may be?

the cars drivability and [performance is not affected.

Thank you all

__________________
Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.

Yup, I have a faint whistle, whine or noise like you describe when accelerating. Also, no prefomance issues either. I have no idea what it is and ok with leaving it be.

__________________
Treetops
06 E320 CDI 127K Miles
87 300TD 231K Miles

99 E300 269K Miles-Sold

Me too. Next time I am under the hood I will check the hose between the manifold and MAP sensor, maybe it has a pin hole leak or something.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

I vaguely remember someone else asking this question and the answer was something to the extent of that's normal and how the acceleration system works in the older MBZ; with the vacuum of the pedal. I'll try to find the exact response and report back. Sorry for the ambiguity.


-Dmitry

Thank you, Dmitry.... as I have scoured the web with no success in even finding a remote mention of this problem..... I really LOVE this car and have no reservations about digging into it and learning more!

Thank you so much!

__________________
Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.

Headlight level adjuster ??

Only if the 210 has HIDs, and on the 210 the headlight adjusters are electrical servo motors, not vacuum pods as in the earlier models. There are sensors on the front and rear sway bars that send a signal to a control module, which drives the servos. The old system was a manual knob on the dash that sent vacuum to the light adjusters.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

Vacuum pods on my 97 e300td w210 ..I had trouble changing the main light switch last week as the two purple plastic lines are in the way and I had to thread the switch around at angles to get it into place.
Non hid ,Uk car

I think that was a Euro only thing. US spec W210s are as I described above.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech

FINALLY...... PROBLEM SOLVED!!!..... Hoses from cooler to turbo charger, clamp was tight but not applying enough pressure to seal completely and at higher rpms (just before transmission shifts) the "vacuum" for the turbo increases and creates the unusual sound.... REPLACE THE CLAMPS!... I hope this helps someone else because I've been chasing this down for months

__________________
Currently Driving
2006 E320 CDI
1999 E300 Turbo Diesl
2002 ML500
1995 E320 Station Wagon


MBs I've owned
1997 E320 Assassinated by Pine Tree
1987 300E Wife Killed Engine
1981 300D Stretch Limo Total Loss
1970 250 Coupe 212,000 mi.
1974 450sel 184,000 mi.
1974 240D 377,000 mi.
1977 300D 204, 000 mi.
1979 280se God Only Knows!
1983 240D 130,000 mi.
1972 220D 280,000 mi.
1983 300SD 244,000 mi.