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1999 SL500
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123 Posts
Discussion Starter #1
anyone have this? My car has a shake while in park but if I put it in drive and keep the brake down i have none? (the needle in the tack will jump a little while in park) 99' with 48k
 

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00 SL500 SOLD, 05 SL600 Sport, 09 Silverado 4x4 LTZ,SOLD '15Silverado LTZ 6.2 8Speed John Deere 318
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1,781 Posts
Has there been any service done to the car? Like a Plug change, Crankshaft position sensor or Plug wires. If not, put a set of plugs in it!!!!
 

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00 SL500 SOLD, 05 SL600 Sport, 09 Silverado 4x4 LTZ,SOLD '15Silverado LTZ 6.2 8Speed John Deere 318
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1,781 Posts
Motor Mounts will NOT make the Tach. move around!!!!!! These cars are VERY lean at idle, a spark plug will mis-fire and cause a SLIGHT SHAKE in park. When put into Drive, there is enough load on the motor to slow the idle enough to smooth it out!!!!!
 

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99 SL500
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126 Posts
I've dealt with this to varying degrees the entire time I've had this car (almost 2 years) and after going through the usual suspects (mounts, plugs/wires, maf, etc.) I believe its the injectors (gas varnishing/gumming them up due to not being driven enough), since the only thing thats made a noticeable difference are fuel additives - specifically Lubro-moly Jectron (Chevron & Redline made no difference)

I've gotten it down to the point where its barely noticeable, so I've learned to live with it; but for a while I was considering ultrasonic cleaning - watch this for an example
 
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