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  #1  
Old 06-12-2005, 10:43 PM
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Exclamation Wicked Shimmy @ Idle

Would anyone be able to tell me what to check to fix a wicked shimmy @ idle on an '82 300D with 300k+ miles? The idle is set @ c.600rpm, there are no vacuum leaks, etc. Both my mechanic and I are stumped.

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  #2  
Old 06-12-2005, 10:50 PM
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Have you adjusted the rack dampner bolt ?
Have you checked the condition of the engine shock absorbers ?
Have you checed the condition of the engine mounts ?
Have you taken the fuel from each piston to see if the rpm drop is equal ?
Have you set the IP timing ?
Have you set the valves lately ?
Have you checked the timing chain elongation ?
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  #3  
Old 06-12-2005, 10:51 PM
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Search for "rack dampner" and "rack damper". I think you will find some good pertinent info.

Have you.... (well, I don't think there are any left).
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'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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  #4  
Old 06-12-2005, 10:53 PM
compress ignite's Avatar
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"shimmy"?

TWD,

Check the motor mounts.
Check each injector, with the engine running,by
loosening the capnuts on top of each injector(have plenty of rags ready
they will bleed some diesel)[you are looking for the the injector that does
not make the idle worse,thats your baby!]
No joy yet? Start thinking compression and leak down testing.
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  #5  
Old 06-12-2005, 10:57 PM
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Idle should be about 750. Fixing that will smooth it out a little. I'm thinking engine mounts and rack dampner will pretty much fix it. Air cleaner mount will probably be broken from shaking around so much.
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2004 C240 Wagon 203.261 Baby Benz
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  #6  
Old 06-12-2005, 11:39 PM
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my money is on rack dampner as well
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1980 500SE/AMG Euro
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1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
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past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350
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  #7  
Old 06-13-2005, 12:13 AM
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I just replaced the rack dampner pin/screw on my '85 wagon Saturday. Not the miracle cure I was hoping for, but I just think my idle is too low at this point. My tach doesn't work (haven't searched that one yet), but it does smooth out with a little pedal.
Do a search on it here, and find out where it goes. See if yours is silver(old style) or bronzish (new style). My old silver one had a very flattened out tip, which is also spring loaded. Newer one was just a tad longer, and was beveled at the tip.
Now to figure out the tach thing.......
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Jimmy L.
'05 Acura TL 6MT
2001 ML430 My Spare

Gone:
'95 E300 188K "Batmobile" Texas Unfriendly Black
'85 300TD 235K "The Wagon" Texas Friendly White
'80 240D 154K "China" Scar engine installed
'81 300TD 240K "Smash"
'80 240D 230K "The Squash"
'81 240D 293K"Scar" Rear ended harder than Elton John
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  #8  
Old 06-13-2005, 04:38 PM
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Join Date: Jun 2005
Location: Charleston
Posts: 26
Thumbs up Smooth as Silk

Thank you gentlemen. I adjusted the rack dampener screw, it was cranked fully counter-clockwise, and she is running nicely.

Now, if I can just get the AC to blow a little colder.

Sincerely,

Tommy Darcy
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  #9  
Old 06-13-2005, 05:00 PM
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Location: central Texas
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Anytime....

Start a new thread about the AC... maybe we can get lucky two times in a row...
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  #10  
Old 06-13-2005, 07:32 PM
t walgamuth's Avatar
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Join Date: Apr 2005
Location: Lafayette Indiana
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tach

sometimes the tach can be cured at least temporarily by removint the large plastic screw cap on th elf fender near the relays and spraying electrical cleaner spray into the elcetrical plugs. i have no explanation as to why this works but it does, sometimes.

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..I also have a 427 Cobra replica with an aluminum chassis.
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