I have a 1984 190D which starts up just find and runs well. At first it idles just fine but after it warms up and tools around for say five miles or so, it idles like an old tractor. I've read it described elsewhere as a "lope" or that the engine is "loping" I've also read that other model such as the 300SD have a "rack dampener pin" which can help control this. Is there some way to control the idle. Thanks.

Can you provide a bit of background about any sort of routine maintenance the car has been given for the last say, eight months to a year? It's helpful to know the existing condition of items such as filters, injectors, and so on.

I don't think a non-turbo has a rack dampner pin, but I'm no 190D authority. Could be the good ole hydraulic lifters.....

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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