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#1
01-14-2015, 09:32 AM
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Loud Howling, Erratic Speedo 84 300D
Merrily driving along in the 84 300D at about 45 mph when all of there sudden there was a consistent loud howling sound coming from the left side of the instrument cluster....and I could feel a vibration coming through the dash. At the same time, the speedometer began to bounce around between 40 and 60 and eventually settled around 100 with the needle visibly vibrating the whole time. Then as soon as my speed dropped to 20, the noise went away and speedo function returned to normal. Everything fine for the rest of my 15 minute trip.
So what's going on?
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife 
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#2
01-14-2015, 10:09 AM
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Your speedo cable is bad
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68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500 Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i
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#3
01-14-2015, 10:40 AM
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It could be the cable, or the bearings in the speedo itself could need lube. It sounds like there is interference between the magnet and the drum that moves the needle. A bad cable shouldn't send the speed to 100 MPH.
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'83 300D, 126K miles.
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#4
01-14-2015, 10:44 AM
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In most cases, it IS the speedo cable that's bad. However, it can *sometimes* be the speedo head itself. Case in point:
When it's very cold in the morning (well, California's version of cold) my '95, which has an electric speedo (no cable) will display the same symptoms for a few miles, then go away for the rest of the day. I figure it has something to do with the combination of wear / tolerances, and lube hardening / displacement that causes the noise & needle bounce until things warm up a bit. I will say it is an impressively LOUD howling noise too! EDIT: Rscurtis beat me to the punch by a few minutes. (I type slowly.)
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Current rolling stock: 2001 E55 183,000+ Newest member of the fleet. 2002 E320 83,000 - The "cream-puff"! 1992 500E 217,000+ 1995 E300D 412,000+ 1998 E300D 155,000+ 2001 E320 227,000+ 2001 E320 Wagon, 177,000+ Prior MBZ’s: 1952 220 Cab A 1966 300SE 1971 280SE 1973 350SLC (euro) 1980 450SLC 1980 450SLC (#2) 1978 450SLC 5.0 1984 300D ~243,000 & fondly remembered 1993 500E - sorely missed.  1975 VW Scirocco w/ slightly de-tuned Super-Vee engine - Sold after 30+ years.
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#5
01-14-2015, 10:51 AM
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It was pretty cold (18F) and the car had sat for about a week not being driven.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#6
01-14-2015, 10:53 AM
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I had this when it got really "cold" in sunny S.C. in my DD last winter. Really high pitched whine ... which increased or slowed down with the MPH, respectively, and around 20 MPH, it stopped. I just removed my cluster, unscrewed the speedo, put a drop or 2 of oil and it has worked fine since then.
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#7
01-14-2015, 12:28 PM
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My experience has been the speedo cable. Usually worse in cold weather. Sometimes a little lube in the cable helps, other times, it needs to be replaced.
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1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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#8
01-14-2015, 12:40 PM
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My girlfriends 201 and the 201 I sold my friend both whined when cold then went away after a few minutes of Driving. A fresh cable in my girlfriends car sorted hers out, my friend dropped some ATF on his cable and it helped.
I guess I did not read thoroughly, the jumping to 100mph is the bizarre part. May be the speedo itself.
__________________
68 280SL - 70 280SL - 70 300SEL 3.5 - 72 350SL - 72 280SEL 4.5 - 72 220 - 72 220D - 73 450SL - 84 230GE - 87 200TD - 90 190E 2.0 - 03 G500 Nissan GTR - Nissan Skyline GTS25T - Toyota GTFour - Rover Mini - Toyota Land Cruiser HJ60 - Cadillac Eldorado - BMW E30 - BMW 135i
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#9
01-14-2015, 12:58 PM
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Haha....did it again...this time the needle moved around so violently that it BROKE OFF...simply sitting there in the instrument cluster.
So I downloaded a speedometer app! 
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#10
01-14-2015, 01:13 PM
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Quote:
__________________
1991 F250 super-cab 7.3 IDI. (rebuilt by me) Banks Sidewinder turbo, hydroboost brakes, new IP and injectors. 2003 S430 - 107K 1983 300SD - Tanoshii - mostly restored ~400K+. 1983 300SD - Good interior. Engine finally tamed ~250K. Monark Nozzle Install Video - http://tinyurl.com/ptd2tge
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#11
01-14-2015, 04:57 PM
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Quote:
__________________
Current rolling stock: 2001 E55 183,000+ Newest member of the fleet. 2002 E320 83,000 - The "cream-puff"! 1992 500E 217,000+ 1995 E300D 412,000+ 1998 E300D 155,000+ 2001 E320 227,000+ 2001 E320 Wagon, 177,000+ Prior MBZ’s: 1952 220 Cab A 1966 300SE 1971 280SE 1973 350SLC (euro) 1980 450SLC 1980 450SLC (#2) 1978 450SLC 5.0 1984 300D ~243,000 & fondly remembered 1993 500E - sorely missed. 1975 VW Scirocco w/ slightly de-tuned Super-Vee engine - Sold after 30+ years.
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#12
01-14-2015, 06:21 PM
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Quote:
 .
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'06 E320 CDI '17 Corvette Stingray Vert
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#13
01-14-2015, 07:54 PM
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Quote:
__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife Last edited by shertex; 01-15-2015 at 07:20 AM.
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#14
01-14-2015, 11:53 PM
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Quote:
...
__________________
'06 E320 CDI '17 Corvette Stingray Vert
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#15
01-15-2015, 05:25 AM
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currently listening to this sound during my morning commute. I've been reading that a few drops of atf fluid will cure it. This makes sense because the transmission drips fluid down into the speedocable, unfortunately the cable is unable to carry it all the way to the other end of the cable.
There is no need to buy another cable, learned the hardway on this one.
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Nosce Te Ipsum "Know thyself"
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