Thanks, Peter.

What about the O-ring on the fuel pressure regulator in the side of the fuel 
distributor?

My research shows that it can also be an issue, especially in cars where the 
fuel system has been crudded up.

Dan

Sent from my iPad

> On Jul 21, 2014, at 11:34 PM, Peter Frederick via Mercedes 
> <mercedes@okiebenz.com> wrote:
> 
> The leaking points are:
> 
> fuel distributor to throttle body boot (buried on that car, you have to 
> remove the manifold I think, but you have to anyway, see point #2)
> 
> seals between intake manifold halves (this is an issue for all the V8s of 
> that design type)
> 
> Idle control valve hoses
> 
> Injector seals
> 
> Injector holder seals (bet you didn't even know they existed, eh?).  On the 
> M103 there is a plastic sleeve the injector fits into, and they have an 
> o-ring in a slot on the outside to seal with the manifold.  They go bad, and 
> replacing the injector seals doesn't fix the issue.
> 
> Typically all these must be replaced together, so its better to pull the 
> manifold and do it all at once.  The throttle body to fuel distributor boot 
> bolts to the fuel distributor, so it all has to come out.
> 
> Makes a big improvement in running and throttle response when you get it all 
> sealed up.
> 
> Another point to check is a sticky fuel distributor air flap pivot or plunger 
> seal.  If the flap does not move very freely with light pressure and spring 
> back up to the idle stop by itself if depressed, you need to clean it and 
> maybe pull the plunger and clean that.  Once in a while the plunger seal gets 
> leaky or drags too much, in either case mixture control is erratic and you 
> get running problems.
> 
> Peter
> 
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