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#1
04-01-2008, 06:47 PM
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intense vibration at idle (617) Help?
I have an '84 300cdt. Since i have had it, it has always run good and smooth except When it needed a rack damper adjustment and even then it was just a slight "wobble" at idle. Recently, it has developed an intense vibration when at idle speed. Strong enough to shake the hood, bumper, steering wheel, the corner lenses actually shook loose, etc. With 310,000 mi. on it, i'm not sure where to begin. any input would be very much appreciated.
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coupes are cooler than sedans 84 300cd-t 305k 84 caddilac eldorado 43k 87 shelby GLHS 84k 86 dodge daytona shelby 112k 77 buick lesaber sc 74k all coupes 
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#2
04-01-2008, 06:56 PM
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Engine mounts, then trans mount, then engine shocks.
Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles
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#3
04-01-2008, 07:09 PM
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I figured mounts and shocks but was puzzled by the fact that the vibration started overnight. It was running smooth, then one morning i started it up and there was the vibration.
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coupes are cooler than sedans 84 300cd-t 305k 84 caddilac eldorado 43k 87 shelby GLHS 84k 86 dodge daytona shelby 112k 77 buick lesaber sc 74k all coupes
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#4
04-01-2008, 11:02 PM
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Back off all the injector lines one at a time to verify you have not dropped a cylinder at idle. If you find one that does not make much difference check the valve clearances if long overdue.. Since the marker lights are shaking loose from the fenders it sounds like more than a gradual motor mount deterioration. Maybe a totally broken motor mount though.
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#6
04-02-2008, 05:45 AM
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Quote:
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83 SD 84 CD
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#7
04-02-2008, 07:59 AM
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If the motor mounts have sunk til it is metal to metal it will sound like someone is working on your frame with a jackhammer.
Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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