[W126 Coupe] White smoke plus missfire update

[mavris2 at comcast.net]

>From what you are describing there the smoke issue sounds like bad valve seats in the engine.  The surging issue, are you using your cruise control while it is doing this??    

Jason 

-------------- Original message -------------- 
From: Pavel <zhur0002 at umn.edu> 

> 
> Here is the update on my 560sel. After raising the fuel pressure on the 
> eha valve and running a few tanks of fresh gas the idle is smooth. I do 
> suspect a vacuum leak somewhere because the economy gauge is not all the 
> way to the left at idle and when coasting at 40 the rpm move around 
> slightly and surge car forward than slow down. 
> My next problem is white smoke. After a long drive on highway when I come 
> to a stop it lets out a cloud of fog. Or if I accelerate very hard and 
> stop fast it will release a cloud of smoke when I slow down (using the 
> brakes not engine). As soon as i put some load on the motor the smoke goes 
> away. I figured that it was a tranny modulator and replaced it made it 
> smoke less frequent but still does it once in a while. I do not burn any 
> antifreeze or oil (less than a quart of oil every 5k miles) Could I have 
> bought a bad modulator? Or is this connected to my vacuum gremlin? BTW I'm 
> using mobil one synthetic tranny fluid. 
> thanks 
> Pavel 
> 
> 
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