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#1
05-29-2007, 05:29 PM
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'91 300D shakes when idling
i just bought my very first mercedes (actually, first car of any kind) after searching long and hard for exactly what i wanted, so first i'll request a moment of silence for my bank account followed by a round of applause for my purchase...
anyway, the car shakes pretty intensely when it idles, but when it reaches 800-900 RPM it's ok. any ideas as to what could be causing this? my friend suggested that it might be related to the idle-control valve, but he's unsure if these cars have one. i obviously have no clue either way. has anyone experienced this? the shaking is pretty bad and i'm hoping it's not symptomatic of a very expensive problem... thanks!! 
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#2
05-29-2007, 05:48 PM
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Welcome to MB diesel world. A shake at idle is most likely engine mounts. Not an overly expensive problem, but messy an a challenge. Could also be vale adjustment, an air leak in the fuel system, or about a dozen other things. Sounds like the idle may be low anyway. I;m sure someone will pipe up with the spec for idle for you. Please take the time to update you profile with your car, location and such, might be a user close to you who can give you a hand. Chuck
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2000 C230 Kompressor "Frosty" 2007 PT Cruiser 2001 VW TDI Beetle 1999 Landrover Discovery II 1971 Corvette Gone: 97 Cabrio, 83 240D, 93 VW Eurovan, 95 Volvo 850, 93 Chevy Astro Van, 77 VW Bus, 99 VW Jetta, 74 VW Bus
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#3
05-29-2007, 08:47 PM
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My car shakes real noticably at idle when I am running diesel. Almost feels like the engine is about to die.
When the car is running veggie fuel the idle is as smooth as silk. Since I run veggie fuel 95% of the time, I haven't worried about it too much, yet.
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Pictures of the MB: http://s230.photobucket.com/albums/ee41/EricandRobyn/1981%20Mercedes/ 1981 300 SD with a Goldenrod water block and Injetor line heaters. EGR is missing  1999 F-350 with HP X-over, Dahl 100 Fuel Filter, Coolant by-pass filter, CCV mod, Tymar intake. Both on single tank WVO blend 
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#5
05-30-2007, 06:29 AM
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it might have a low cylinder.
a shake at idle will cause me to walk away from a car. checking compression would reveal this. 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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