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  #16  
Old 12-07-2007, 09:59 PM
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Join Date: Aug 2004
Location: Western Washington
Posts: 504
Sounds like....

a vacuum problem at idle. Have you tested vacuum?
Should be at least 15-16 psi at idle.
The intake manifold is a source, if you can get a vacuum gauge hose there (my 280S has one)

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1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old
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  #17  
Old 12-07-2007, 10:52 PM
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Join Date: Sep 2005
Posts: 343
Crap. I think you're right.

I'm getting 17 at 1200 RPM (in park vacuum advance removed) in gear it drops to 750 RPM and it's at 12" of vacuum.

I think I haven't tightened the intake manifold enough. Last time I stripped the bolt hole PITA to fix and now I have a phobia.

Thanks for your help.
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72 250 M130 W114
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  #18  
Old 12-14-2007, 01:36 PM
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Join Date: Sep 2005
Posts: 343
Hey Munich,

Just wanted to say thanks. Tightend the manifold nuts and the problem went away. She's been runng great ever since.

Much appriciated.
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72 250 M130 W114
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  #19  
Old 12-14-2007, 08:59 PM
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Join Date: Aug 2004
Location: Western Washington
Posts: 504
It's amazing what can loosen up

I was inspecting the contact points, and as my hand bumped the Distributor, it moved.
Well, the 2 Distributor housing Hex bolts were loose. Go figure!

BTW, check your exhaust manifold bolts.
They are often loose, and overlooked.

__________________
1970 280S M130 engine- good runner
1971 250 M130 engine- #2 rod bearing, gone
1971 280SE (blown engine,parts car)
1977 German 280S W116-only 33 years old

Last edited by MunichTaxi; 12-14-2007 at 09:00 PM. Reason: correction
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