Quote:
Originally Posted by jkubica
After I changed out my motor mounts on my 1985 300td I had a problem that the engine would idle well cold and then start to miss and shake as it warmed up. Following advice from members, I changed out the fuel filters & fuel lines, cracked the injector lines to verify that all the cylinders were working and did a diesel purge. None of which helped.
But another member suggestion did the trick - screwing the rack damper bolt in -now she just purrs and purrs.
I never would have found the problen without the help of the forum.
Thanks!
Joseph
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Screwing it all the way in will cut your full power potential and can cause hard starts and stalling in colder temperatures. The ideal way to tune out the shaking is to both adjust the idle speed and the rack damper to a perfect sweet spot. It took me 40 minutes under the hood of my SD to find that spot....but right around 750ish rpm with the rack damper out a couple turns, it runs absolutely smoothly, 0 shake at all. Well worth having my face by a hot idling engine for 40 minutes. 
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